{"id":2299,"date":"2017-05-14T15:01:22","date_gmt":"2017-05-14T15:01:22","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/?p=2299"},"modified":"2021-01-29T17:42:06","modified_gmt":"2021-01-29T17:42:06","slug":"calcaire-vignes-orchidees","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/2017\/05\/14\/calcaire-vignes-orchidees\/","title":{"rendered":"Calcaire, vignes et orchid\u00e9es"},"content":{"rendered":"

Le lendemain de ma conf\u00e9rence du vendredi 12 mai sur le campus de l\u2019Universit\u00e9 de Bordeaux (voir mon blog du 7 mai), j\u2019ai \u00e9t\u00e9 gentiment invit\u00e9 \u00e0 une excursion g\u00e9ologique organis\u00e9e par l\u2019association C.A.P. Terre (Comit\u00e9 Aquitain de la Plan\u00e8te Terre, Mireille Verna pr\u00e9sidente). Le th\u00e8me en \u00e9tait \u00ab Vin, terroir et orchid\u00e9es du Fronsadais \u00bb, encadr\u00e9 par les commissaires Jean-Pierre Tastet et Denis Vaslet. Ceci se passait donc dans la r\u00e9gion de Fronsac au Nord-Est de Bordeaux tout pr\u00e8s de Libourne et de la vall\u00e9e de la Dordogne.<\/p>\n

Le premier arr\u00eat consistait \u00e0 \u00ab\u00a0escalader\u00a0\u00bb le Tertre de Thouil, butte t\u00e9moin culminant \u00e0 82 m\u00e8tres, et d\u2019y observer la pelouse \u00e0 orchid\u00e9es (Ophrys abeille, Ophrys mouche, Ophrys scolopax, Orchis pourpre, Orchis pyramidal) sur calcaire \u00e0 ast\u00e9ries et marne rup\u00e9liens.<\/p>\n

Le Rup\u00e9lien est un \u00e9tage de la p\u00e9riode Oligoc\u00e8ne, anciennement appel\u00e9 Stampien, durant lequel se sont \u00e9galement d\u00e9pos\u00e9s les sables de Fontainebleau (voir mon blog du 30 avril) dans le Bassin Parisien.<\/p>\n

\"\"<\/p>\n

Orchis pyramidal sur marnes rup\u00e9liennes sur le Tertre de Thouil (\u00a9 J.M. Bardintzeff).<\/p>\n

Le deuxi\u00e8me arr\u00eat, \u00e0 Saint-Germain-de-la-Rivi\u00e8re, montrait une belle coupe dans les calcaires bioclastiques (= biod\u00e9tritiques) \u00e0 ast\u00e9ries. Les ast\u00e9ries sont de petits osselets du \u00ab\u00a0squelette\u00a0\u00bb des \u00e9toiles de mer.<\/p>\n

\"\"<\/p>\n

Deux niveaux de calcaire \u00e0 ast\u00e9ries, s\u00e9par\u00e9s par un niveau d\u2019argile sombre \u00e0 Saint-Germain-de-la-Rivi\u00e8re. L\u2019ensemble repose sur une “mollasse” imperm\u00e9able o\u00f9 a \u00e9t\u00e9 construit un bassin-lavoir (au premier-plan). Au niveau argileux sombre interm\u00e9diaire correspond aussi un ancien bassin-lavoir visible plus haut sur la route (\u00a9 J.M. Bardintzeff).<\/p>\n

Le troisi\u00e8me arr\u00eat \u00e9tait fix\u00e9 au ch\u00e2teau de Pey Labrie \u00e0 Canon-Fronsac. Le propri\u00e9taire nous a tr\u00e8s gentiment re\u00e7us. Apr\u00e8s un tour du vignoble, il nous a fait d\u00e9guster plusieurs crus.<\/p>\n

\"\"<\/p>\n

Le vignoble du ch\u00e2teau de Pey Labrie, un merlot sur calcaire \u00e0 ast\u00e9ries (\u00a9 J.M. Bardintzeff).<\/p>\n

Le quatri\u00e8me et dernier arr\u00eat se situait \u00e0 Saillans au ch\u00e2teau Puy Guilhem.<\/p>\n

Tr\u00e8s belle journ\u00e9e pluridisciplinaire et conviviale. Un grand merci aux organisateurs.<\/p>\n","protected":false},"excerpt":{"rendered":"

Le lendemain de ma conf\u00e9rence du vendredi 12 mai sur le campus de l\u2019Universit\u00e9 de Bordeaux (voir mon blog du 7 mai), j\u2019ai \u00e9t\u00e9 gentiment invit\u00e9 \u00e0 une excursion g\u00e9ologique organis\u00e9e par l\u2019association C.A.P. Terre (Comit\u00e9 Aquitain de la Plan\u00e8te Terre, Mireille Verna pr\u00e9sidente). Le th\u00e8me en \u00e9tait \u00ab Vin, terroir et orchid\u00e9es du Fronsadais … Continuer la lecture de Calcaire, vignes et orchid\u00e9es<\/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":[6],"tags":[828,827,639,829,830,831,832,553,833,821],"class_list":["post-2299","post","type-post","status-publish","format-standard","hentry","category-actualites","tag-asterie","tag-c-a-p-terre","tag-calcaire","tag-dordogne","tag-excusion-geologique","tag-fronsac","tag-fronsadais","tag-marne","tag-orchidee","tag-rupelien"],"yoast_head":"\nCalcaire, vignes et orchid\u00e9es, 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\/05\/14\/calcaire-vignes-orchidees\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Calcaire, vignes et orchid\u00e9es, par Jacques-Marie Bardintzeff\" \/>\n<meta property=\"og:description\" content=\"Le lendemain de ma conf\u00e9rence du vendredi 12 mai sur le campus de l\u2019Universit\u00e9 de Bordeaux (voir mon blog du 7 mai), j\u2019ai \u00e9t\u00e9 gentiment invit\u00e9 \u00e0 une excursion g\u00e9ologique organis\u00e9e par l\u2019association C.A.P. Terre (Comit\u00e9 Aquitain de la Plan\u00e8te Terre, Mireille Verna pr\u00e9sidente). 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