{"id":2182,"date":"2017-02-26T07:39:46","date_gmt":"2017-02-26T07:39:46","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/?p=2182"},"modified":"2017-02-28T08:36:00","modified_gmt":"2017-02-28T08:36:00","slug":"des-volcans-en-vendee","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/2017\/02\/26\/des-volcans-en-vendee\/","title":{"rendered":"Des volcans en Vend\u00e9e !"},"content":{"rendered":"

Vendredi 24 f\u00e9vrier j\u2018\u00e9tais invit\u00e9 \u00e0 La Roche-sur-Yon (85000) par l\u2018Association Vend\u00e9enne de G\u00e9ologie (A.V.G.) pour une conf\u00e9rence \u201cVolcans, s\u00e9ismes et tsunamis: la Terre en col\u00e8re\u201c (voir mon blog du 17\/2\/2017)\u00a0: salle pleine, tr\u00e8s bonne ambiance, nombreuses questions du public.<\/p>\n

Un rendez-vous \u00e9tait propos\u00e9 \u00e0 ceux qui le voulaient le lendemain matin pour une petite excursion g\u00e9ologique \u00e0 la recherche des volcans (anciens\u00a0!) vend\u00e9ens, anim\u00e9e par Andr\u00e9 Pouclet.<\/p>\n

Nous nous sommes donc retrouv\u00e9s samedi matin \u00e0 8h30 \u00e0 Bretignolles-sur-Mer (85470) au lieu dit La Normandeli\u00e8re, en bord de mer par un beau soleil.<\/p>\n

Nous avons reconnu des rhyolites roses, localement vertes en liaison avec le degr\u00e9 d\u2019oxydation du fer. Les \u00e9paisseurs sont estim\u00e9es \u00e0 200 m pour la coul\u00e9e massive et 200 m \u00e9galement pour la partie pyroclastique qui lui succ\u00e8de. Ces rhyolites ont un \u00e2ge de 485 millions d\u2019ann\u00e9es (\u00e8re Primaire, Ordovicien inf\u00e9rieur, Tremadoc). Elles ont ensuite \u00e9t\u00e9 impliqu\u00e9es dans un chevauchement majeur il y a 330-320 millions d\u2019ann\u00e9es. Leur origine est la fusion crustale comme en atteste la pr\u00e9sence de zircons h\u00e9rit\u00e9s pr\u00e9cambriens.<\/p>\n

\"\"Andr\u00e9 Pouclet (Commissaire de l\u2018excursion, \u00e0 droite) et Jacques-Marie Bardintzeff \u00e0 Bretignolles sur les rhyolites ordoviciennes (\u00a9 J.M. Bardintzeff).<\/p>\n

Dans la m\u00eame commune, environ un kilom\u00e8tre plus au nord, au lieu dit Le Marais Girard, ce sont, sur 100 m d\u2019\u00e9paisseur, des ignimbrites, br\u00e8ches volcaniques soud\u00e9es \u00e0 chaud r\u00e9sultant d\u2019un \u00e9coulement pyroclastique cataclysmal, de type nu\u00e9e ardente. Elles ont \u00e9galement une composition chimique rhyolitique, et le m\u00eame \u00e2ge que la coul\u00e9e lavique mais sont situ\u00e9es stratigraphiquement au-dessus.<\/p>\n

Puis leurs succ\u00e8dent des argilites carbonif\u00e8res en contact tectonique par faille inverse.<\/p>\n

\"\"L\u2018ignimbrite varicolore (\u00a9 J.M. Bardintzeff).<\/p>\n

 <\/p>\n

\"\"Rubanement magmatique dans l\u2019ignimbrite (\u00a9 A. Pouclet).<\/p>\n

 <\/p>\n

\"\"Filon de quartz hydrothermal carbonif\u00e8re sup\u00e9rieur ou permien ? (\u00e9paisseur de l\u2019ordre d\u2018un m\u00e8tre) dans les ignimbrites \u00e9cras\u00e9es le long de la faille inverse (\u00a9 J.M. Bardintzeff).<\/p>\n

Un grand merci \u00e0 Andr\u00e9 Pouclet et \u00e0 l\u2019A.V.G. pour cette belle matin\u00e9e g\u00e9ologique\u00a0!<\/p>\n

L\u2018exposition sur les volcans pr\u00e9sent\u00e9e par l\u2019A.V.G. au Centre Beautour est encore ouverte toute la semaine a venir.<\/p>\n","protected":false},"excerpt":{"rendered":"

Vendredi 24 f\u00e9vrier j\u2018\u00e9tais invit\u00e9 \u00e0 La Roche-sur-Yon (85000) par l\u2018Association Vend\u00e9enne de G\u00e9ologie (A.V.G.) pour une conf\u00e9rence \u201cVolcans, s\u00e9ismes et tsunamis: la Terre en col\u00e8re\u201c (voir mon blog du 17\/2\/2017)\u00a0: salle pleine, tr\u00e8s bonne ambiance, nombreuses questions du public. Un rendez-vous \u00e9tait propos\u00e9 \u00e0 ceux qui le voulaient le lendemain matin pour une petite … Continuer la lecture de Des volcans en Vend\u00e9e !<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[8],"tags":[764,21,776,782,34,777,778,434,779,766,780,775,781,768],"class_list":["post-2182","post","type-post","status-publish","format-standard","hentry","category-voyages","tag-association-vendeenne-de-geologie","tag-bardintzeff","tag-bretignolles-sur-mer","tag-centre-beautour","tag-conference","tag-ere-primaire","tag-excursion-geologique","tag-ignimbrite","tag-ordovicien","tag-pouclet","tag-rhyolite","tag-roche-sur-yon-la","tag-tremadoc","tag-vendee"],"yoast_head":"\nDes volcans en Vend\u00e9e !, par Jacques-Marie Bardintzeff<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.futura-sciences.com\/bardintzeff\/2017\/02\/26\/des-volcans-en-vendee\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Des volcans en Vend\u00e9e !, par Jacques-Marie Bardintzeff\" \/>\n<meta property=\"og:description\" content=\"Vendredi 24 f\u00e9vrier j\u2018\u00e9tais invit\u00e9 \u00e0 La Roche-sur-Yon (85000) par l\u2018Association Vend\u00e9enne de G\u00e9ologie (A.V.G.) pour une conf\u00e9rence \u201cVolcans, s\u00e9ismes et tsunamis: la Terre en col\u00e8re\u201c (voir mon blog du 17\/2\/2017)\u00a0: salle pleine, tr\u00e8s bonne ambiance, nombreuses questions du public. Un rendez-vous \u00e9tait propos\u00e9 \u00e0 ceux qui le voulaient le lendemain matin pour une petite … Continuer la lecture de Des volcans en Vend\u00e9e ! →\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blogs.futura-sciences.com\/bardintzeff\/2017\/02\/26\/des-volcans-en-vendee\/\" \/>\n<meta property=\"og:site_name\" content=\"VOLCANMANIA : le blog de Jacques-Marie BARDINTZEFF, volcanologue\" \/>\n<meta property=\"article:published_time\" content=\"2017-02-26T07:39:46+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2017-02-28T08:36:00+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/blogs.futura-sciences.com\/bardintzeff\/wp-content\/uploads\/sites\/3\/2017\/02\/Bardintzeff.SAM_9811.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1417\" \/>\n\t<meta property=\"og:image:height\" content=\"1063\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"jmbardintzeff\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"jmbardintzeff\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/bardintzeff\/2017\/02\/26\/des-volcans-en-vendee\/\",\"url\":\"https:\/\/blogs.futura-sciences.com\/bardintzeff\/2017\/02\/26\/des-volcans-en-vendee\/\",\"name\":\"Des volcans en Vend\u00e9e !, par Jacques-Marie Bardintzeff\",\"isPartOf\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/bardintzeff\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/bardintzeff\/2017\/02\/26\/des-volcans-en-vendee\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/bardintzeff\/2017\/02\/26\/des-volcans-en-vendee\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/blogs.futura-sciences.com\/bardintzeff\/wp-content\/uploads\/sites\/3\/2017\/02\/Bardintzeff.SAM_9811-450x338.jpg\",\"datePublished\":\"2017-02-26T07:39:46+00:00\",\"dateModified\":\"2017-02-28T08:36:00+00:00\",\"author\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/bardintzeff\/#\/schema\/person\/974e1e0324e3e06f08253784e8eca61e\"},\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/blogs.futura-sciences.com\/bardintzeff\/2017\/02\/26\/des-volcans-en-vendee\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/bardintzeff\/2017\/02\/26\/des-volcans-en-vendee\/#primaryimage\",\"url\":\"https:\/\/blogs.futura-sciences.com\/bardintzeff\/wp-content\/uploads\/sites\/3\/2017\/02\/Bardintzeff.SAM_9811.jpg\",\"contentUrl\":\"https:\/\/blogs.futura-sciences.com\/bardintzeff\/wp-content\/uploads\/sites\/3\/2017\/02\/Bardintzeff.SAM_9811.jpg\",\"width\":1417,\"height\":1063},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/bardintzeff\/#website\",\"url\":\"https:\/\/blogs.futura-sciences.com\/bardintzeff\/\",\"name\":\"VOLCANMANIA : le blog de Jacques-Marie BARDINTZEFF, volcanologue\",\"description\":\"Les volcans ? Passionn\u00e9ment ! Les volcans ne sont pas toujours m\u00e9chants, ils sont aussi les t\u00e9moins de la Terre active !\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/blogs.futura-sciences.com\/bardintzeff\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"fr-FR\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/bardintzeff\/#\/schema\/person\/974e1e0324e3e06f08253784e8eca61e\",\"name\":\"jmbardintzeff\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/bardintzeff\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/d38cb5297008217786910838f2aa1bda?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/d38cb5297008217786910838f2aa1bda?s=96&d=mm&r=g\",\"caption\":\"jmbardintzeff\"},\"url\":\"https:\/\/blogs.futura-sciences.com\/bardintzeff\/author\/jmbardintzeff\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Des volcans en Vend\u00e9e !, par Jacques-Marie Bardintzeff","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/2017\/02\/26\/des-volcans-en-vendee\/","og_locale":"fr_FR","og_type":"article","og_title":"Des volcans en Vend\u00e9e !, par Jacques-Marie Bardintzeff","og_description":"Vendredi 24 f\u00e9vrier j\u2018\u00e9tais invit\u00e9 \u00e0 La Roche-sur-Yon (85000) par l\u2018Association Vend\u00e9enne de G\u00e9ologie (A.V.G.) pour une conf\u00e9rence \u201cVolcans, s\u00e9ismes et tsunamis: la Terre en col\u00e8re\u201c (voir mon blog du 17\/2\/2017)\u00a0: salle pleine, tr\u00e8s bonne ambiance, nombreuses questions du public. Un rendez-vous \u00e9tait propos\u00e9 \u00e0 ceux qui le voulaient le lendemain matin pour une petite … Continuer la lecture de Des volcans en Vend\u00e9e ! →","og_url":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/2017\/02\/26\/des-volcans-en-vendee\/","og_site_name":"VOLCANMANIA : le blog de Jacques-Marie BARDINTZEFF, volcanologue","article_published_time":"2017-02-26T07:39:46+00:00","article_modified_time":"2017-02-28T08:36:00+00:00","og_image":[{"width":1417,"height":1063,"url":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/wp-content\/uploads\/sites\/3\/2017\/02\/Bardintzeff.SAM_9811.jpg","type":"image\/jpeg"}],"author":"jmbardintzeff","twitter_card":"summary_large_image","twitter_misc":{"\u00c9crit par":"jmbardintzeff","Dur\u00e9e de lecture estim\u00e9e":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/2017\/02\/26\/des-volcans-en-vendee\/","url":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/2017\/02\/26\/des-volcans-en-vendee\/","name":"Des volcans en Vend\u00e9e !, par Jacques-Marie Bardintzeff","isPartOf":{"@id":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/#website"},"primaryImageOfPage":{"@id":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/2017\/02\/26\/des-volcans-en-vendee\/#primaryimage"},"image":{"@id":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/2017\/02\/26\/des-volcans-en-vendee\/#primaryimage"},"thumbnailUrl":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/wp-content\/uploads\/sites\/3\/2017\/02\/Bardintzeff.SAM_9811-450x338.jpg","datePublished":"2017-02-26T07:39:46+00:00","dateModified":"2017-02-28T08:36:00+00:00","author":{"@id":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/#\/schema\/person\/974e1e0324e3e06f08253784e8eca61e"},"inLanguage":"fr-FR","potentialAction":[{"@type":"ReadAction","target":["https:\/\/blogs.futura-sciences.com\/bardintzeff\/2017\/02\/26\/des-volcans-en-vendee\/"]}]},{"@type":"ImageObject","inLanguage":"fr-FR","@id":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/2017\/02\/26\/des-volcans-en-vendee\/#primaryimage","url":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/wp-content\/uploads\/sites\/3\/2017\/02\/Bardintzeff.SAM_9811.jpg","contentUrl":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/wp-content\/uploads\/sites\/3\/2017\/02\/Bardintzeff.SAM_9811.jpg","width":1417,"height":1063},{"@type":"WebSite","@id":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/#website","url":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/","name":"VOLCANMANIA : le blog de Jacques-Marie BARDINTZEFF, volcanologue","description":"Les volcans ? Passionn\u00e9ment ! Les volcans ne sont pas toujours m\u00e9chants, ils sont aussi les t\u00e9moins de la Terre active !","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"fr-FR"},{"@type":"Person","@id":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/#\/schema\/person\/974e1e0324e3e06f08253784e8eca61e","name":"jmbardintzeff","image":{"@type":"ImageObject","inLanguage":"fr-FR","@id":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/d38cb5297008217786910838f2aa1bda?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/d38cb5297008217786910838f2aa1bda?s=96&d=mm&r=g","caption":"jmbardintzeff"},"url":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/author\/jmbardintzeff\/"}]}},"_links":{"self":[{"href":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/wp-json\/wp\/v2\/posts\/2182","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/wp-json\/wp\/v2\/comments?post=2182"}],"version-history":[{"count":9,"href":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/wp-json\/wp\/v2\/posts\/2182\/revisions"}],"predecessor-version":[{"id":2196,"href":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/wp-json\/wp\/v2\/posts\/2182\/revisions\/2196"}],"wp:attachment":[{"href":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/wp-json\/wp\/v2\/media?parent=2182"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/wp-json\/wp\/v2\/categories?post=2182"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/wp-json\/wp\/v2\/tags?post=2182"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}