{"id":488,"date":"2020-10-23T15:57:31","date_gmt":"2020-10-23T15:57:31","guid":{"rendered":"http:\/\/strasbourg.apbg.org\/?p=488"},"modified":"2026-02-03T10:37:08","modified_gmt":"2026-02-03T09:37:08","slug":"sortie-de-geologique-du-12-octobre-2019","status":"publish","type":"post","link":"https:\/\/strasbourg.apbg.fr\/?p=488","title":{"rendered":"Sortie de g\u00e9ologique du 12 octobre 2019"},"content":{"rendered":"\n<p>Deux sites d\u2019exception en Alsace&nbsp;ont choisi d\u2019\u00eatre d\u00e9couverts ou red\u00e9couverts \u00e0 la lumi\u00e8re des derni\u00e8res avanc\u00e9es scientifiques&nbsp;:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Le Champ de fracture de Ribauvill\u00e9\u00a0: le Florimont<\/li>\n\n\n\n<li>Les Ophiolithes du Thalhorn<\/li>\n<\/ul>\n\n\n\n<p>Nous \u00e9tions accompagn\u00e9s par Nicolas Th\u00e9venin et des g\u00e9ologues de son \u00e9quipe de la <a href=\"http:\/\/www.geologie-alsace.fr\/\">Maison de la G\u00e9ologie<\/a> (bas\u00e9e \u00e0 Sentheim).<\/p>\n\n\n\n<p><strong>S<span style=\"color:#0d00a3\" class=\"has-inline-color\">ite <\/span><span style=\"color:#0002a3\" class=\"has-inline-color\">du Florimont<\/span><\/strong><\/p>\n\n\n\n<p>Par une tr\u00e8s belle journ\u00e9e d\u2019automne, au milieu des grands crus du vignoble alsacien, les membres de la r\u00e9gionale se sont retrouv\u00e9s sur le champ de fracture de Ribauvill\u00e9, non loin de Colmar, sur le site du Florimont.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"807\" height=\"605\" src=\"https:\/\/strasbourg.apbg.fr\/wp-content\/uploads\/2026\/01\/IMG_2162.jpg\" alt=\"\" class=\"wp-image-68\" srcset=\"https:\/\/strasbourg.apbg.fr\/wp-content\/uploads\/2026\/01\/IMG_2162.jpg 807w, https:\/\/strasbourg.apbg.fr\/wp-content\/uploads\/2026\/01\/IMG_2162-300x225.jpg 300w, https:\/\/strasbourg.apbg.fr\/wp-content\/uploads\/2026\/01\/IMG_2162-768x576.jpg 768w\" sizes=\"auto, (max-width: 807px) 100vw, 807px\" \/><figcaption class=\"wp-element-caption\">site du Florimont<br><\/figcaption><\/figure>\n\n\n\n<p>Ce site remarquable nous a permis de retracer l\u2019histoire g\u00e9ologique des Vosges et du foss\u00e9 rh\u00e9nan (de -330 Ma \u00e0 30 Ma), sur \u00e0 peine quelques centaines de m\u00e8tres de ballade. Les d\u00e9p\u00f4ts s\u00e9dimentaires, pour certains fossilif\u00e8res (Calcaires \u00e0 entroques, Marnes calcaires \u00e0 Belemnites, Ammonites et huitres) sont d\u2019une grande diversit\u00e9, des miroirs de failles du champ de fracture sont facilement identifiables.&nbsp;&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"807\" height=\"605\" src=\"https:\/\/strasbourg.apbg.fr\/wp-content\/uploads\/2026\/01\/IMG_2168.jpg\" alt=\"\" class=\"wp-image-69\" srcset=\"https:\/\/strasbourg.apbg.fr\/wp-content\/uploads\/2026\/01\/IMG_2168.jpg 807w, https:\/\/strasbourg.apbg.fr\/wp-content\/uploads\/2026\/01\/IMG_2168-300x225.jpg 300w, https:\/\/strasbourg.apbg.fr\/wp-content\/uploads\/2026\/01\/IMG_2168-768x576.jpg 768w\" sizes=\"auto, (max-width: 807px) 100vw, 807px\" \/><figcaption class=\"wp-element-caption\">Calcaire \u00e0 entroques du Muschelkalk<\/figcaption><\/figure>\n\n\n\n<p>Ils nous ont permis de faire le lien entre tectonique et s\u00e9dimentation (diversit\u00e9 des conglom\u00e9rats c\u00f4tiers qui permettent de reconstituer plusieurs pal\u00e9o-environnements). L\u2019analyse g\u00e9omorphologique du paysage permet d\u2019aborder l\u2019\u00e9rosion diff\u00e9rentielle en fonction de la nature des roches et le paysage observ\u00e9.<\/p>\n\n\n\n<p><strong><span style=\"color:#1200a3\" class=\"has-inline-color\">S<\/span><span style=\"color:#0002a3\" class=\"has-inline-color\">ite du Thalhorn<\/span><\/strong><\/p>\n\n\n\n<p>Le deuxi\u00e8me site visit\u00e9 est tout simplement exceptionnel, c\u2019est notre \u00ab&nbsp;Chenaillet&nbsp;alsacien&nbsp;\u00bb. Le site du Thalhorn dans les Vosges du sud, au fond de la vall\u00e9e glaciaire de Thann nous permet d\u2019admirer un complexe ophiolitique tr\u00e8s bien conserv\u00e9.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"605\" height=\"807\" src=\"https:\/\/strasbourg.apbg.fr\/wp-content\/uploads\/2026\/01\/IMG_2219.jpg\" alt=\"\" class=\"wp-image-72\" srcset=\"https:\/\/strasbourg.apbg.fr\/wp-content\/uploads\/2026\/01\/IMG_2219.jpg 605w, https:\/\/strasbourg.apbg.fr\/wp-content\/uploads\/2026\/01\/IMG_2219-225x300.jpg 225w\" sizes=\"auto, (max-width: 605px) 100vw, 605px\" \/><figcaption class=\"wp-element-caption\">descente Thalhorn<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"686\" height=\"601\" src=\"https:\/\/strasbourg.apbg.fr\/wp-content\/uploads\/2026\/01\/IMG_2197.jpg\" alt=\"\" class=\"wp-image-70\" srcset=\"https:\/\/strasbourg.apbg.fr\/wp-content\/uploads\/2026\/01\/IMG_2197.jpg 686w, https:\/\/strasbourg.apbg.fr\/wp-content\/uploads\/2026\/01\/IMG_2197-300x263.jpg 300w\" sizes=\"auto, (max-width: 686px) 100vw, 686px\" \/><figcaption class=\"wp-element-caption\">carri\u00e8re de p\u00e9ridotite serpentinis\u00e9e<\/figcaption><\/figure>\n\n\n\n<p>On peut y observer des p\u00e9ridotites serpentinis\u00e9es et de tr\u00e8s beaux affleurements de gabbros. Ces ophiolites, lambeaux de lithosph\u00e8re oc\u00e9anique (du D\u00e9vonien sup\u00e9rieur) sont incluses dans un front de chevauchement d\u2019\u00e2ge hercynien.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"807\" height=\"605\" src=\"https:\/\/strasbourg.apbg.fr\/wp-content\/uploads\/2026\/01\/IMG_2208.jpg\" alt=\"\" class=\"wp-image-71\" srcset=\"https:\/\/strasbourg.apbg.fr\/wp-content\/uploads\/2026\/01\/IMG_2208.jpg 807w, https:\/\/strasbourg.apbg.fr\/wp-content\/uploads\/2026\/01\/IMG_2208-300x225.jpg 300w, https:\/\/strasbourg.apbg.fr\/wp-content\/uploads\/2026\/01\/IMG_2208-768x576.jpg 768w\" sizes=\"auto, (max-width: 807px) 100vw, 807px\" \/><figcaption class=\"wp-element-caption\">gabbro<\/figcaption><\/figure>\n\n\n\n<p>Les travaux de Pierre Fluck et ceux r\u00e9cents <a href=\"https:\/\/tel.archives-ouvertes.fr\/tel-00773597\/document\">d\u2019Etienne Skrzypek<\/a> ont permis une nouvelle compr\u00e9hension de cette \u00ab&nbsp;Ligne de Klippes&nbsp;\u00bb connues depuis bien longtemps en Alsace.<\/p>\n\n\n\n<p> JJ BELEN<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Deux sites d\u2019exception en Alsace&nbsp;ont choisi d\u2019\u00eatre d\u00e9couverts ou red\u00e9couverts \u00e0 la lumi\u00e8re des derni\u00e8res avanc\u00e9es scientifiques&nbsp;: Nous \u00e9tions accompagn\u00e9s<\/p>\n","protected":false},"author":1,"featured_media":491,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_container_layout":"default_layout","colormag_page_sidebar_layout":"default_layout","footnotes":""},"categories":[3,7],"tags":[],"class_list":["post-488","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-archives","category-sortie"],"_links":{"self":[{"href":"https:\/\/strasbourg.apbg.fr\/index.php?rest_route=\/wp\/v2\/posts\/488","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/strasbourg.apbg.fr\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/strasbourg.apbg.fr\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/strasbourg.apbg.fr\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/strasbourg.apbg.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=488"}],"version-history":[{"count":2,"href":"https:\/\/strasbourg.apbg.fr\/index.php?rest_route=\/wp\/v2\/posts\/488\/revisions"}],"predecessor-version":[{"id":800,"href":"https:\/\/strasbourg.apbg.fr\/index.php?rest_route=\/wp\/v2\/posts\/488\/revisions\/800"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/strasbourg.apbg.fr\/index.php?rest_route=\/"}],"wp:attachment":[{"href":"https:\/\/strasbourg.apbg.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=488"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/strasbourg.apbg.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=488"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/strasbourg.apbg.fr\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=488"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}