{"id":728,"date":"2018-09-11T14:55:44","date_gmt":"2018-09-11T12:55:44","guid":{"rendered":"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/?page_id=728"},"modified":"2019-09-24T20:12:49","modified_gmt":"2019-09-24T18:12:49","slug":"64-teschenite-de-buzy","status":"publish","type":"page","link":"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/64-teschenite-de-buzy\/","title":{"rendered":"64 &#8211; Tesch\u00e9nite de Buzy"},"content":{"rendered":"<h6 style=\"text-align: center\"><strong>LE MAGMATISME DANS LA ZONE NORD PYRENEENNE AU CRETACE SUPERIEUR<\/strong><\/h6>\n<table style=\"height: 173px\" width=\"100%\">\n<tbody>\n<tr>\n<td style=\"text-align: center\" colspan=\"2\" width=\"412\"><span style=\"color: #00ccff\"><a style=\"color: #00ccff\" href=\"http:\/\/u.osmfr.org\/m\/227986\/\"><strong>Coordonn\u00e9es GPS du parking<\/strong><\/a><\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center\" width=\"206\"><span style=\"color: #000000\">43.126671<\/span><\/td>\n<td style=\"text-align: center\" width=\"206\"><span style=\"color: #000000\">-0.473785<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center\" colspan=\"2\" width=\"412\"><span style=\"color: #000000\"><strong>Coordonn\u00e9es GPS de l&#8217;affleurement de tesch\u00e9nite<\/strong><\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center\" width=\"206\"><span style=\"color: #000000\">43.127172<\/span><\/td>\n<td style=\"text-align: center\" width=\"206\"><span style=\"color: #000000\">-0.473353<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center\" colspan=\"2\" width=\"412\"><span style=\"color: #000000\"><strong>Coordonn\u00e9es GPS de l&#8217;affleurement de m\u00e9tamorphisme de contact<\/strong><\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center\" width=\"206\"><span style=\"color: #000000\">43.127692<\/span><\/td>\n<td style=\"text-align: center\" width=\"206\"><span style=\"color: #000000\">-0.474066<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<div>\n<table width=\"100%\">\n<tbody>\n<tr>\n<td align=\"center\" width=\"49%\">\n<p><figure id=\"attachment_610\" aria-describedby=\"caption-attachment-610\" style=\"width: 504px\" class=\"wp-caption alignleft\"><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/1-extrait-de-la-carte-ge\u0301ologique-dOloron-Ste-Marie-n\u00b01051N.jpg\" width=\"504\" height=\"234\" \/><figcaption id=\"caption-attachment-610\" class=\"wp-caption-text\">Carte g\u00e9ologique : N\u00b01051N &#8211; OLORON STE MARIE<\/figcaption><\/figure><\/td>\n<td align=\"center\" width=\"51%\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/2-extrait-le\u0301gende-carte-Oloron-Ste-Marie-n\u00b01051N.jpg\" width=\"1485\" height=\"688\" \/><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<figure id=\"attachment_735\" aria-describedby=\"caption-attachment-735\" style=\"width: 1632px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/64-teschenite-de-buzy\/3-localisation-du-site-et-des-affleurements\/\" rel=\"attachment wp-att-735\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-735\" src=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/3-localisation-du-site-et-des-affleurements.jpg\" alt=\"\" width=\"1632\" height=\"839\" srcset=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/3-localisation-du-site-et-des-affleurements.jpg 1632w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/3-localisation-du-site-et-des-affleurements-300x154.jpg 300w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/3-localisation-du-site-et-des-affleurements-768x395.jpg 768w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/3-localisation-du-site-et-des-affleurements-1024x526.jpg 1024w\" sizes=\"auto, (max-width: 1632px) 100vw, 1632px\" \/><\/a><figcaption id=\"caption-attachment-735\" class=\"wp-caption-text\">Localisation du site et des affleurements<\/figcaption><\/figure>\n<figure id=\"attachment_736\" aria-describedby=\"caption-attachment-736\" style=\"width: 1478px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/64-teschenite-de-buzy\/4-vue-aerienne-du-site-et-position-des-affleurements\/\" rel=\"attachment wp-att-736\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-736\" src=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/4-vue-ae\u0301rienne-du-site-et-position-des-affleurements.jpg\" alt=\"\" width=\"1478\" height=\"944\" srcset=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/4-vue-ae\u0301rienne-du-site-et-position-des-affleurements.jpg 1478w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/4-vue-ae\u0301rienne-du-site-et-position-des-affleurements-300x192.jpg 300w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/4-vue-ae\u0301rienne-du-site-et-position-des-affleurements-768x491.jpg 768w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/4-vue-ae\u0301rienne-du-site-et-position-des-affleurements-1024x654.jpg 1024w\" sizes=\"auto, (max-width: 1478px) 100vw, 1478px\" \/><\/a><figcaption id=\"caption-attachment-736\" class=\"wp-caption-text\">Vue ae\u0301rienne du site et position des affleurements<\/figcaption><\/figure>\n<p><span style=\"color: #000000\"><strong><u>Description du site<\/u> :<\/strong><\/span><\/p>\n<p><span style=\"color: #000000\"><u>Une roche magmatique&#8230;<\/u><\/span><\/p>\n<p><span style=\"color: #000000\">La tesch\u00e9nite de Buzy est une roche magmatique filonienne d&#8217;\u00e2ge campanien (83 \u00e0 72 Ma = fin du cr\u00e9tac\u00e9 sup\u00e9rieur). Sa mise en place sous forme de filons est li\u00e9e \u00e0 l&#8217;ouverture du golfe de Gascogne. Elle est associ\u00e9e \u00e0 la mise en place de coul\u00e9es de spilites en surface et correspond \u00e0 la derni\u00e8re phase du magmatisme cr\u00e9tac\u00e9 dans la zone nord des Pyr\u00e9n\u00e9es.<\/span><\/p>\n<p><span style=\"color: #000000\">Lors de l&#8217;ouverture du golfe de Gascogne, de l&#8217;Albien au Campanien, l&#8217;amincissement extr\u00eame de la cro\u00fbte continentale a men\u00e9 en certains lieux \u00e0 la fusion partielle du manteau et \u00e0 une accr\u00e9tion oc\u00e9anique dont la tesch\u00e9nite est un t\u00e9moin\u00a0: elle constituerait les filons menant \u00e0 la formation d&#8217;un plancher oc\u00e9anique quand le magma arrive \u00e0 l&#8217;affleurement (voir coul\u00e9es de spilites dans la r\u00e9gion).<\/span><\/p>\n<p><span style=\"color: #000000\">La tesch\u00e9nite de Buzy est une roche m\u00e9socrate (pourcentages voisins de min\u00e9raux \u00ab\u00a0blancs\u00a0\u00bb [surtout feldspaths ici] et de min\u00e9raux \u00ab\u00a0noirs\u00a0\u00bb ferromagn\u00e9siens [surtout des amphiboles et des pyrox\u00e8nes ici]).<\/span><\/p>\n<figure id=\"attachment_737\" aria-describedby=\"caption-attachment-737\" style=\"width: 3968px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/64-teschenite-de-buzy\/bty-30\/\" rel=\"attachment wp-att-737\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-737\" src=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/5-affleurement-de-tesche\u0301nite-dans-son-ensemble.jpg\" alt=\"\" width=\"3968\" height=\"2976\" srcset=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/5-affleurement-de-tesche\u0301nite-dans-son-ensemble.jpg 3968w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/5-affleurement-de-tesche\u0301nite-dans-son-ensemble-300x225.jpg 300w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/5-affleurement-de-tesche\u0301nite-dans-son-ensemble-768x576.jpg 768w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/5-affleurement-de-tesche\u0301nite-dans-son-ensemble-1024x768.jpg 1024w\" sizes=\"auto, (max-width: 3968px) 100vw, 3968px\" \/><\/a><figcaption id=\"caption-attachment-737\" class=\"wp-caption-text\">Affleurement tesche\u0301nite_Ensemble<\/figcaption><\/figure>\n<p><span style=\"color: #000000\">On y observe de tr\u00e8s grandes baguettes d&#8217;amphiboles = structure pegmatito\u00efdique [tr\u00e8s grands min\u00e9raux et absence de quartz].<\/span><\/p>\n<figure id=\"attachment_738\" aria-describedby=\"caption-attachment-738\" style=\"width: 3968px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/64-teschenite-de-buzy\/bty-31\/\" rel=\"attachment wp-att-738\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-738\" src=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/6-fragment-de-roche-saine-et-grandes-baguettes-damphibole.jpg\" alt=\"\" width=\"3968\" height=\"2976\" srcset=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/6-fragment-de-roche-saine-et-grandes-baguettes-damphibole.jpg 3968w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/6-fragment-de-roche-saine-et-grandes-baguettes-damphibole-300x225.jpg 300w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/6-fragment-de-roche-saine-et-grandes-baguettes-damphibole-768x576.jpg 768w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/6-fragment-de-roche-saine-et-grandes-baguettes-damphibole-1024x768.jpg 1024w\" sizes=\"auto, (max-width: 3968px) 100vw, 3968px\" \/><\/a><figcaption id=\"caption-attachment-738\" class=\"wp-caption-text\">Fragment de roche saine et grandes baguettes d&#8217;amphibole<\/figcaption><\/figure>\n<p><span style=\"color: #000000\">La tesch\u00e9nite de Buzy est donc une roche magmatique sous-satur\u00e9e (ou basique = relativement pauvre en SiO<sub>2<\/sub> [absence de quartz] et riche en Ca, Fe, Mg) et alcaline (car pr\u00e9sence de feldspaths alcalins avec Na et K).<\/span><\/p>\n<p><span style=\"color: #000000\"><u>\u2026 alt\u00e9r\u00e9e&#8230;<\/u><\/span><\/p>\n<p><span style=\"color: #000000\">L&#8217;affleurement de tesch\u00e9nite de Buzy pr\u00e9sente un aspect tout \u00e0 fait caract\u00e9ristique d&#8217;alt\u00e9ration des roches silicat\u00e9es. On observe des \u00ab\u00a0boules\u00a0\u00bb, des \u00ab\u00a0pelures d&#8217;oignon\u00a0\u00bb et de la roche alt\u00e9r\u00e9e friable et meuble d\u00e9nomm\u00e9e \u00ab\u00a0ar\u00e8ne\u00a0\u00bb.<\/span><\/p>\n<figure id=\"attachment_739\" aria-describedby=\"caption-attachment-739\" style=\"width: 2976px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/64-teschenite-de-buzy\/bty-32\/\" rel=\"attachment wp-att-739\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-739\" src=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/7-petit-fragment-de-roche-saine-et-are\u0300ne.jpg\" alt=\"\" width=\"2976\" height=\"3968\" srcset=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/7-petit-fragment-de-roche-saine-et-are\u0300ne.jpg 2976w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/7-petit-fragment-de-roche-saine-et-are\u0300ne-225x300.jpg 225w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/7-petit-fragment-de-roche-saine-et-are\u0300ne-768x1024.jpg 768w\" sizes=\"auto, (max-width: 2976px) 100vw, 2976px\" \/><\/a><figcaption id=\"caption-attachment-739\" class=\"wp-caption-text\">Petit fragment de roche saine et are\u0300ne<\/figcaption><\/figure>\n<p><span style=\"color: #000000\">L&#8217;eau acide charg\u00e9e de CO<sub>2<\/sub> dissous attaque les silicates dans le sous-sol. Ceci provoque\u00a0:<\/span><\/p>\n<ul>\n<li><span style=\"color: #000000\">un d\u00e9part des ions mis en solution (principalement ions Ca<sup>2+<\/sup>, Mg<sup>2+<\/sup>, Fe<sup>2+<\/sup>, Na<sup>+<\/sup>, K<sup>+<\/sup> et une partie du SiO<sub>2<\/sub> sous forme SiO<sub>3<\/sub><sup>2-<\/sup>)\u00a0;<\/span><\/li>\n<li><span style=\"color: #000000\">une r\u00e9organisation dans de nouveaux r\u00e9seaux cristallins stables de ce qui n&#8217;est pas export\u00e9 (principalement Al<sup>3+<\/sup>, Fe<sup>3+<\/sup> et une partie de la silice) sous forme d&#8217;argiles (= phyllosilicates hydrat\u00e9s).<\/span><\/li>\n<\/ul>\n<p><span style=\"color: #000000\"><em>Rmq\u00a0: lien possible avec le diagramme de Goldschmidt.<\/em><\/span><\/p>\n<p><span style=\"color: #000000\">Cette alt\u00e9ration se r\u00e9alise principalement dans le sous-sol, dans les fissures de la roche o\u00f9 l&#8217;eau peut encore circuler (en surface l&#8217;eau ruisselle et ne stagne pas suffisamment pour hydrolyser les silicates).<\/span><\/p>\n<p><span style=\"color: #000000\"><strong>L&#8217;ar\u00e8ne<\/strong> est compos\u00e9e d&#8217;un m\u00e9lange de min\u00e9raux r\u00e9siduels non encore alt\u00e9r\u00e9s et transform\u00e9s et d&#8217;argiles en formation.<\/span><\/p>\n<p><span style=\"color: #000000\">L&#8217;alt\u00e9ration, progressant le long des fissures, \u00e9pargne (temporairement) les zones situ\u00e9es entre les fissures. Il y a donc, en profondeur, des ensembles de roche saine s\u00e9par\u00e9s par des bandes de roches alt\u00e9r\u00e9es et ar\u00e9nis\u00e9es qui prennent la forme de &#8220;<strong>boules<\/strong>&#8221; plus ou moins ovo\u00efdes ou sph\u00e9riques. Cette transformation, souterraine, n&#8217;est pas visible dans le cas g\u00e9n\u00e9ral. Elle ne se voit que si des travaux, ou une reprise d&#8217;\u00e9rosion, d\u00e9gagent et mettent \u00e0 nu ces zones normalement enfouies.<\/span><\/p>\n<p><span style=\"color: #000000\">Il y a un gradient d&#8217;alt\u00e9ration entre les fissures et le centre des &#8220;boules&#8221; \u00e9pargn\u00e9es, avec des zones de plus en plus alt\u00e9r\u00e9es du centre de la boule vers l&#8217;ext\u00e9rieur. Ce gradient d&#8217;alt\u00e9ration peut se traduire par un gradient de variation de volume\u00a0: la transformation de feldspath en argile, le plus ou moins grand dess\u00e8chement de ces argiles en fonction de la saison, le gel-d\u00e9gel de l&#8217;eau dans ces aur\u00e9oles \u00e0 porosit\u00e9 variable&#8230; Tout cela conduit \u00e0 faire varier le volume de fa\u00e7on diff\u00e9rentielle entre le c\u0153ur des zones saines et leur p\u00e9riph\u00e9rie de plus en plus alt\u00e9r\u00e9e.<\/span><\/p>\n<p><span style=\"color: #000000\">Les boules des roches silicat\u00e9es ont donc souvent, une fois mises \u00e0 nu et observables, une structure dite en &#8221; pelure d&#8217;oignon &#8220;.<\/span><\/p>\n<figure id=\"attachment_740\" aria-describedby=\"caption-attachment-740\" style=\"width: 3968px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/64-teschenite-de-buzy\/bty-33\/\" rel=\"attachment wp-att-740\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-740\" src=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/8-alte\u0301ration-en-boules-et-pelures-doignon.jpg\" alt=\"\" width=\"3968\" height=\"2976\" srcset=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/8-alte\u0301ration-en-boules-et-pelures-doignon.jpg 3968w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/8-alte\u0301ration-en-boules-et-pelures-doignon-300x225.jpg 300w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/8-alte\u0301ration-en-boules-et-pelures-doignon-768x576.jpg 768w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/8-alte\u0301ration-en-boules-et-pelures-doignon-1024x768.jpg 1024w\" sizes=\"auto, (max-width: 3968px) 100vw, 3968px\" \/><\/a><figcaption id=\"caption-attachment-740\" class=\"wp-caption-text\">Alte\u0301ration en boules et pelures d&#8217;oignon<\/figcaption><\/figure>\n<figure id=\"attachment_741\" aria-describedby=\"caption-attachment-741\" style=\"width: 3968px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/64-teschenite-de-buzy\/bty-34\/\" rel=\"attachment wp-att-741\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-741\" src=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/9-de\u0301tails-de-lalte\u0301ration-en-pelures-doignon.jpg\" alt=\"\" width=\"3968\" height=\"2976\" srcset=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/9-de\u0301tails-de-lalte\u0301ration-en-pelures-doignon.jpg 3968w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/9-de\u0301tails-de-lalte\u0301ration-en-pelures-doignon-300x225.jpg 300w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/9-de\u0301tails-de-lalte\u0301ration-en-pelures-doignon-768x576.jpg 768w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/9-de\u0301tails-de-lalte\u0301ration-en-pelures-doignon-1024x768.jpg 1024w\" sizes=\"auto, (max-width: 3968px) 100vw, 3968px\" \/><\/a><figcaption id=\"caption-attachment-741\" class=\"wp-caption-text\">De\u0301tails de l&#8217;alte\u0301ration en pelures d&#8217;oignon<\/figcaption><\/figure>\n<p><span style=\"color: #000000\"><u>\u2026 ayant engendr\u00e9 un m\u00e9tamorphisme de contact thermique lors de sa mise en place.<\/u><\/span><\/p>\n<p><span style=\"color: #000000\">Au moment de leur mise en en place, les filons chauds de magma \u00e0 l&#8217;origine de la tesch\u00e9nite \u00e9taient au contact de roches s\u00e9dimentaires encaissantes d\u00e9pos\u00e9es ant\u00e9rieurement formant le flysch turonien (94 \u00e0 90 Ma, c3 sur la carte g\u00e9ologique n\u00b01051N d&#8217;Oloron Ste Marie).<\/span><\/p>\n<p><span style=\"color: #000000\">Le flysch turonien comprend des bancs de calcaire marneux, de calcaire dur et de gr\u00e8s.<\/span><\/p>\n<p><span style=\"color: #000000\">Le mat\u00e9riel chaud a entra\u00een\u00e9 un m\u00e9tamorphisme de contact thermique qui a transform\u00e9 les roches s\u00e9dimentaires de l&#8217;encaissant. Ces roches m\u00e9tamorphiques, beaucoup plus dures que les roches originelles suite \u00e0 leur \u00ab\u00a0cuisson\u00a0\u00bb, peuvent \u00eatre qualifi\u00e9es de marbre. Elles offrent un bel exemple de m\u00e9tamorphisme de contact thermique.<\/span><\/p>\n<figure id=\"attachment_743\" aria-describedby=\"caption-attachment-743\" style=\"width: 3968px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/64-teschenite-de-buzy\/bty-36\/\" rel=\"attachment wp-att-743\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-743\" src=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/10-affleurement-me\u0301tamorphisme-de-contact-thermique.jpg\" alt=\"\" width=\"3968\" height=\"2976\" srcset=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/10-affleurement-me\u0301tamorphisme-de-contact-thermique.jpg 3968w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/10-affleurement-me\u0301tamorphisme-de-contact-thermique-300x225.jpg 300w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/10-affleurement-me\u0301tamorphisme-de-contact-thermique-768x576.jpg 768w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/10-affleurement-me\u0301tamorphisme-de-contact-thermique-1024x768.jpg 1024w\" sizes=\"auto, (max-width: 3968px) 100vw, 3968px\" \/><\/a><figcaption id=\"caption-attachment-743\" class=\"wp-caption-text\">Affleurement me\u0301tamorphisme de contact thermique<\/figcaption><\/figure>\n<figure id=\"attachment_742\" aria-describedby=\"caption-attachment-742\" style=\"width: 3968px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/64-teschenite-de-buzy\/bty-35\/\" rel=\"attachment wp-att-742\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-742\" src=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/11-de\u0301tails-me\u0301tamorphisme-thermique-de-contact-dans-roches-se\u0301dimentaires-du-Turonien-.jpg\" alt=\"\" width=\"3968\" height=\"2976\" srcset=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/11-de\u0301tails-me\u0301tamorphisme-thermique-de-contact-dans-roches-se\u0301dimentaires-du-Turonien-.jpg 3968w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/11-de\u0301tails-me\u0301tamorphisme-thermique-de-contact-dans-roches-se\u0301dimentaires-du-Turonien--300x225.jpg 300w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/11-de\u0301tails-me\u0301tamorphisme-thermique-de-contact-dans-roches-se\u0301dimentaires-du-Turonien--768x576.jpg 768w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/11-de\u0301tails-me\u0301tamorphisme-thermique-de-contact-dans-roches-se\u0301dimentaires-du-Turonien--1024x768.jpg 1024w\" sizes=\"auto, (max-width: 3968px) 100vw, 3968px\" \/><\/a><figcaption id=\"caption-attachment-742\" class=\"wp-caption-text\">D\u00e9tails m\u00e9tamorphisme thermique de contact dans roches s\u00e9dimentaires du Turonien<\/figcaption><\/figure>\n<p><span style=\"color: #000000\"><strong><u>Activit\u00e9s envisageables<\/u> :<\/strong><\/span><\/p>\n<ul>\n<li><span style=\"color: #000000\">se rep\u00e9rer, s&#8217;orienter sur une carte, avec une boussole, en utilisant une application de g\u00e9olocalisation<\/span><\/li>\n<li><span style=\"color: #000000\">r\u00e9aliser un croquis ou traiter num\u00e9riquement une photographie de l&#8217;affleurement, de la roche, des min\u00e9raux \u2192 notion d&#8217;\u00e9chelle<\/span><\/li>\n<li><span style=\"color: #000000\">relier la pr\u00e9sence de la tesch\u00e9nite dans la zone nord pyr\u00e9n\u00e9enne dans le contexte g\u00e9n\u00e9ral de la tectonique des plaques (oc\u00e9anisation au cr\u00e9tac\u00e9)<\/span><\/li>\n<li><span style=\"color: #000000\">r\u00e9aliser un sch\u00e9ma interpr\u00e9tatif de la disposition des continents \u00e0 diff\u00e9rentes p\u00e9riodes en indiquant les mouvements relatifs des diff\u00e9rents blocs<\/span><\/li>\n<li><span style=\"color: #000000\">comparer la roche saine et la roche alt\u00e9r\u00e9e (mesures de conductim\u00e9trie possibles au laboratoire apr\u00e8s pr\u00e9l\u00e8vement d&#8217;un fragment de roche saine et d&#8217;ar\u00e8ne)<\/span><\/li>\n<li><span style=\"color: #000000\">expliquer comment les ph\u00e9nom\u00e8nes d&#8217;alt\u00e9ration agissent sur le model\u00e9 de l&#8217;affleurement<\/span><\/li>\n<li><span style=\"color: #000000\">r\u00e9aliser une coupe ou un sch\u00e9ma interpr\u00e9tatif de la disposition des roches (tesch\u00e9nite en filon \/ flysch encaissant) et repr\u00e9senter le m\u00e9tamorphisme de contact<\/span><\/li>\n<li><span style=\"color: #000000\">d\u00e9duire de la disposition des roches une datation relative des couches g\u00e9ologiques pr\u00e9sentes<\/span><\/li>\n<\/ul>\n<p><span style=\"color: #000000\"><strong><u>Acc\u00e8s \/ s\u00e9curit\u00e9<\/u>\u00a0:<\/strong><\/span><\/p>\n<p><span style=\"color: #000000\">Dans Buzy, suivre les indications \u00ab\u00a0Moto-cross\u00a0\u00bb et \u00ab\u00a0Gave d&#8217;Ossau\u00a0\u00bb. Le parking pour le bus se trouve \u00e0 l&#8217;intersection de la \u00ab\u00a0route du gave\u00a0\u00bb et du \u00ab\u00a0chemin des Arrecous\u00a0\u00bb. Les rues dans Buzy sont \u00e9troites mais aucune limitation de dimension n&#8217;est indiqu\u00e9e.<\/span><\/p>\n<figure id=\"attachment_744\" aria-describedby=\"caption-attachment-744\" style=\"width: 3968px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/64-teschenite-de-buzy\/bdr-4\/\" rel=\"attachment wp-att-744\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-744\" src=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/12-mairie-de-Buzy.jpg\" alt=\"\" width=\"3968\" height=\"2976\" srcset=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/12-mairie-de-Buzy.jpg 3968w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/12-mairie-de-Buzy-300x225.jpg 300w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/12-mairie-de-Buzy-768x576.jpg 768w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/12-mairie-de-Buzy-1024x768.jpg 1024w\" sizes=\"auto, (max-width: 3968px) 100vw, 3968px\" \/><\/a><figcaption id=\"caption-attachment-744\" class=\"wp-caption-text\">Mairie de Buzy<\/figcaption><\/figure>\n<figure id=\"attachment_745\" aria-describedby=\"caption-attachment-745\" style=\"width: 3968px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/64-teschenite-de-buzy\/bty-37\/\" rel=\"attachment wp-att-745\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-745\" src=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/13-dans-Buzy.jpg\" alt=\"\" width=\"3968\" height=\"2976\" srcset=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/13-dans-Buzy.jpg 3968w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/13-dans-Buzy-300x225.jpg 300w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/13-dans-Buzy-768x576.jpg 768w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/13-dans-Buzy-1024x768.jpg 1024w\" sizes=\"auto, (max-width: 3968px) 100vw, 3968px\" \/><\/a><figcaption id=\"caption-attachment-745\" class=\"wp-caption-text\">Dabs Buzy<\/figcaption><\/figure>\n<figure id=\"attachment_746\" aria-describedby=\"caption-attachment-746\" style=\"width: 3968px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/64-teschenite-de-buzy\/bty-38\/\" rel=\"attachment wp-att-746\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-746\" src=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/14-place-Cazenave-dans-Buzy.jpg\" alt=\"\" width=\"3968\" height=\"2976\" srcset=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/14-place-Cazenave-dans-Buzy.jpg 3968w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/14-place-Cazenave-dans-Buzy-300x225.jpg 300w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/14-place-Cazenave-dans-Buzy-768x576.jpg 768w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/14-place-Cazenave-dans-Buzy-1024x768.jpg 1024w\" sizes=\"auto, (max-width: 3968px) 100vw, 3968px\" \/><\/a><figcaption id=\"caption-attachment-746\" class=\"wp-caption-text\">Place Cazenave dans Buzy<\/figcaption><\/figure>\n<figure id=\"attachment_747\" aria-describedby=\"caption-attachment-747\" style=\"width: 3968px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/64-teschenite-de-buzy\/bdr-5\/\" rel=\"attachment wp-att-747\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-747\" src=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/15-dans-Buzy.jpg\" alt=\"\" width=\"3968\" height=\"2976\" srcset=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/15-dans-Buzy.jpg 3968w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/15-dans-Buzy-300x225.jpg 300w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/15-dans-Buzy-768x576.jpg 768w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/15-dans-Buzy-1024x768.jpg 1024w\" sizes=\"auto, (max-width: 3968px) 100vw, 3968px\" \/><\/a><figcaption id=\"caption-attachment-747\" class=\"wp-caption-text\">Dans Buzy<\/figcaption><\/figure>\n<figure id=\"attachment_748\" aria-describedby=\"caption-attachment-748\" style=\"width: 3968px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/64-teschenite-de-buzy\/bdr-6\/\" rel=\"attachment wp-att-748\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-748\" src=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/16-rue-Casamayou.jpg\" alt=\"\" width=\"3968\" height=\"2976\" srcset=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/16-rue-Casamayou.jpg 3968w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/16-rue-Casamayou-300x225.jpg 300w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/16-rue-Casamayou-768x576.jpg 768w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/16-rue-Casamayou-1024x768.jpg 1024w\" sizes=\"auto, (max-width: 3968px) 100vw, 3968px\" \/><\/a><figcaption id=\"caption-attachment-748\" class=\"wp-caption-text\">Rue Casamayou<\/figcaption><\/figure>\n<figure id=\"attachment_749\" aria-describedby=\"caption-attachment-749\" style=\"width: 3968px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/64-teschenite-de-buzy\/bty-39\/\" rel=\"attachment wp-att-749\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-749\" src=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/17-rue-du-Burguet.jpg\" alt=\"\" width=\"3968\" height=\"2976\" srcset=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/17-rue-du-Burguet.jpg 3968w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/17-rue-du-Burguet-300x225.jpg 300w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/17-rue-du-Burguet-768x576.jpg 768w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/17-rue-du-Burguet-1024x768.jpg 1024w\" sizes=\"auto, (max-width: 3968px) 100vw, 3968px\" \/><\/a><figcaption id=\"caption-attachment-749\" class=\"wp-caption-text\">Rue du Burguet<\/figcaption><\/figure>\n<p><span style=\"color: #000000\">L&#8217;affleurement de tesch\u00e9nite est en sous-bois \u00e0 quelques m\u00e8tres de la route. Il ne pr\u00e9sente pas de dangerosit\u00e9 vis \u00e0 vis de la circulation. L&#8217;affleurement est en cours d&#8217;alt\u00e9ration, la roche friable par endroit&#8230; Attention\u00a0aux glissades et aux \u00e9boulements intempestifs\u00a0!<\/span><\/p>\n<figure id=\"attachment_750\" aria-describedby=\"caption-attachment-750\" style=\"width: 3968px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/64-teschenite-de-buzy\/bty-40\/\" rel=\"attachment wp-att-750\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-750\" src=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/18-parking-bus-sur-site.jpg\" alt=\"\" width=\"3968\" height=\"2976\" srcset=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/18-parking-bus-sur-site.jpg 3968w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/18-parking-bus-sur-site-300x225.jpg 300w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/18-parking-bus-sur-site-768x576.jpg 768w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/18-parking-bus-sur-site-1024x768.jpg 1024w\" sizes=\"auto, (max-width: 3968px) 100vw, 3968px\" \/><\/a><figcaption id=\"caption-attachment-750\" class=\"wp-caption-text\">Parking bus sur site<\/figcaption><\/figure>\n<figure id=\"attachment_751\" aria-describedby=\"caption-attachment-751\" style=\"width: 3968px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/64-teschenite-de-buzy\/bty-41\/\" rel=\"attachment wp-att-751\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-751\" src=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/19-acce\u0300s-aux-deux-sites-a\u0300-pied.jpg\" alt=\"\" width=\"3968\" height=\"2976\" srcset=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/19-acce\u0300s-aux-deux-sites-a\u0300-pied.jpg 3968w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/19-acce\u0300s-aux-deux-sites-a\u0300-pied-300x225.jpg 300w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/19-acce\u0300s-aux-deux-sites-a\u0300-pied-768x576.jpg 768w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/19-acce\u0300s-aux-deux-sites-a\u0300-pied-1024x768.jpg 1024w\" sizes=\"auto, (max-width: 3968px) 100vw, 3968px\" \/><\/a><figcaption id=\"caption-attachment-751\" class=\"wp-caption-text\">Acce\u0300s aux deux sites a\u0300 pied<\/figcaption><\/figure>\n<figure id=\"attachment_752\" aria-describedby=\"caption-attachment-752\" style=\"width: 3968px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/64-teschenite-de-buzy\/bty-42\/\" rel=\"attachment wp-att-752\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-752\" src=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/20-sentier-vers-affleurement-tesche\u0301nite-de-face.jpg\" alt=\"\" width=\"3968\" height=\"2976\" srcset=\"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/20-sentier-vers-affleurement-tesche\u0301nite-de-face.jpg 3968w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/20-sentier-vers-affleurement-tesche\u0301nite-de-face-300x225.jpg 300w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/20-sentier-vers-affleurement-tesche\u0301nite-de-face-768x576.jpg 768w, https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-content\/uploads\/sites\/59\/2018\/09\/20-sentier-vers-affleurement-tesche\u0301nite-de-face-1024x768.jpg 1024w\" sizes=\"auto, (max-width: 3968px) 100vw, 3968px\" \/><\/a><figcaption id=\"caption-attachment-752\" class=\"wp-caption-text\">Sentier vers affleurement tesch\u00e9nite de face<\/figcaption><\/figure>\n<p><span style=\"color: #000000\">L&#8217;affleurement de roches m\u00e9tamorphiques est en bordure de la route du gave. Il n&#8217;y a quasiment pas de circulation \u00e0 cet endroit mais la vigilance est de mise.<\/span><\/p>\n<p><span style=\"color: #000000\"><strong><u>Mots-cl\u00e9s et liens avec les programmes<\/u> :<\/strong><\/span><\/p>\n<table width=\"643\">\n<tbody>\n<tr>\n<td colspan=\"2\" width=\"321\"><strong>Coll\u00e8ge<\/strong><\/td>\n<td colspan=\"2\" width=\"321\"><strong>Lyc\u00e9e<\/strong><\/td>\n<\/tr>\n<tr>\n<td width=\"58\">Cycle 3<\/td>\n<td width=\"264\">Identifier les composantes g\u00e9ologiques d&#8217;un paysage &#8211; g\u00e9ologie locale &#8211; ph\u00e9nom\u00e8nes g\u00e9ologiques traduisant l&#8217;activit\u00e9 interne de la Terre &#8211; ph\u00e9nom\u00e8nes traduisant l&#8217;activit\u00e9 externe de la Terre (alt\u00e9ration)<\/td>\n<td width=\"50\">2nde<\/td>\n<td width=\"271\">L\u2019\u00e9rosion, processus et cons\u00e9quences<\/td>\n<\/tr>\n<tr>\n<td rowspan=\"2\" width=\"58\">Cycle 4<\/td>\n<td rowspan=\"2\" width=\"264\">Expliquer quelques ph\u00e9nom\u00e8nes g\u00e9ologiques \u00e0 partir du contexte g\u00e9odynamique global (volcanisme cr\u00e9tac\u00e9 dans les Pyr\u00e9n\u00e9es et oc\u00e9anisation)<\/td>\n<td width=\"50\">1\u00e8re sp\u00e9 SVT<\/td>\n<td width=\"271\">La caract\u00e9risation de la mobilit\u00e9 horizontale<\/p>\n<p>La dynamique des zones de divergence<\/td>\n<\/tr>\n<tr>\n<td width=\"50\">TS<\/td>\n<td width=\"271\">1B1\u00a0: M\u00e9tamorphisme de contact<\/p>\n<p>1B4\u00a0: alt\u00e9ration \u2013 d\u00e9mant\u00e8lement de la CC<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong style=\"color: #000000\"><u>A proximit\u00e9<\/u>\u00a0:<\/strong><\/p>\n<ul>\n<li><span style=\"color: #000000\">Dolmen de Buzy class\u00e9 monument historique<\/span><\/li>\n<\/ul>\n<p><strong><span style=\"color: #000000\"><span style=\"text-decoration: underline\">Temps pour se rendre \u00e0 Buzy en autobus depuis<\/span> :<\/span><\/strong><br \/>\n<span style=\"color: #000000\">Pau \u21921h<\/span><br \/>\n<span style=\"color: #000000\">Bayonne \u2192 2h15<\/span><br \/>\n<span style=\"color: #000000\">Oloron Ste Marie \u2192 30<\/span><br \/>\n<span style=\"color: #000000\">Orthez \u2192 1h30<\/span><br \/>\n<span style=\"color: #000000\">Dax \u2192 2h<\/span><br \/>\n<span style=\"color: #000000\">Mont de Marsan \u2192 2h15<\/span><br \/>\n<span style=\"color: #000000\">Bordeaux \u2192 3h<\/span><\/p>\n<p><span style=\"color: #000000\"><strong><u>Bibliographie \/ sitographie<\/u> :<\/strong><\/span><\/p>\n<p><span style=\"color: #000000\">Carte g\u00e9ologique au 1\/50 000 d&#8217;Oloron Ste Marie et sa notice, n\u00b01051N, \u00e9ditions BRGM<\/span><\/p>\n<p><span style=\"color: #000000\">L&#8217;alt\u00e9ration des roches silicat\u00e9es :<\/span> <a href=\"http:\/\/planet-terre.ens-lyon.fr\/image-de-la-semaine\/Img145-2006-01-09.xml\">http:\/\/planet-terre.ens-lyon.fr\/image-de-la-semaine\/Img145-2006-01-09.xml<\/a><\/p>\n<p><span style=\"color: #000000\">Dictionnaire de g\u00e9ologie, 5e \u00e9dition, Masson Sciences, \u00e9ditions DUNOD<\/span><\/p>\n<p><span style=\"color: #000000\">Th\u00e9ralite \u2192<\/span> <a href=\"http:\/\/lithotheque.ens-lyon.fr\/Lithotheque\/FormRech\/page.php?recup=A41.14\">http:\/\/lithotheque.ens-lyon.fr\/Lithotheque\/FormRech\/page.php?recup=A41.14<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>LE MAGMATISME DANS LA ZONE NORD PYRENEENNE AU CRETACE SUPERIEUR Coordonn\u00e9es GPS du parking 43.126671 -0.473785 Coordonn\u00e9es GPS de l&#8217;affleurement de tesch\u00e9nite 43.127172 -0.473353 Coordonn\u00e9es GPS de l&#8217;affleurement de m\u00e9tamorphisme &#8230;<\/p>\n","protected":false},"author":8,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-728","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-json\/wp\/v2\/pages\/728","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-json\/wp\/v2\/comments?post=728"}],"version-history":[{"count":7,"href":"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-json\/wp\/v2\/pages\/728\/revisions"}],"predecessor-version":[{"id":1286,"href":"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-json\/wp\/v2\/pages\/728\/revisions\/1286"}],"wp:attachment":[{"href":"https:\/\/ent2d.ac-bordeaux.fr\/disciplines\/lithotheque\/wp-json\/wp\/v2\/media?parent=728"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}