{"id":5442,"date":"2020-01-04T10:43:59","date_gmt":"2020-01-04T10:43:59","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/?p=5442"},"modified":"2020-01-04T10:48:51","modified_gmt":"2020-01-04T10:48:51","slug":"silex-a-bozzhyra-kazakhstan","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/bardintzeff\/2020\/01\/04\/silex-a-bozzhyra-kazakhstan\/","title":{"rendered":"Silex \u00e0 Bozzhyra, Kazakhstan"},"content":{"rendered":"

\u00c0 Bozzhyra au Kazakhstan (voir mon blog du 14\/12\/2019 et du 3\/1\/2020), on d\u00e9couvre un niveau riche en blocs sombres sur la craie blanche\u00a0: il s\u2019agit de masses de silex, d\u2019une taille pouvant d\u00e9passer 10 centim\u00e8tres, souvent arrondies en rognons qui ont parfois \u00e9clat\u00e9 en formes anguleuses (voir aussi mon blog du 14\/12\/2016).<\/p>\n

\"\"Jacques-Marie Bardintzeff, g\u00e9ologue et volcanologue, pr\u00e9sente un rognon de silex, \u00e0 Bozzhyra, Kazakhstan (\u00a9 J.M. Bardintzeff, merci \u00e0 Sylvain Chermette).<\/p>\n

<\/p>\n

Dans la mer de l\u2019\u00e9poque (\u00e8re secondaire), la silice a pr\u00e9cipit\u00e9 pour former ces rognons de silex au sein du niveau calcaire (craie). Les fragments de silex ont ensuite \u00e9t\u00e9 d\u00e9gag\u00e9s par l\u2019\u00e9rosion (usure de la craie) et sont maintenant concentr\u00e9s en surface.<\/p>\n

\"\"<\/p>\n

Un niveau riche en fragments de silex, \u00e0 Bozzhyra au Kazakhstan (\u00a9 J.M. Bardintzeff).<\/p>\n

Le niveau de calcaire blanc (craie) sous-jacent est tr\u00e8s fossilif\u00e8re (fossiles de mollusques bivalves, rostres de b\u00e9lemnites silicifi\u00e9s, oursins, coraux).<\/p>\n

\"\"Masses de silex sombres sur la craie blanche, \u00e0 Bozzhyra au Kazakhstan (\u00a9 J.M. Bardintzeff).<\/p>\n","protected":false},"excerpt":{"rendered":"

\u00c0 Bozzhyra au Kazakhstan (voir mon blog du 14\/12\/2019 et du 3\/1\/2020), on d\u00e9couvre un niveau riche en blocs sombres sur la craie blanche\u00a0: il s\u2019agit de masses de silex, d\u2019une taille pouvant d\u00e9passer 10 centim\u00e8tres, souvent arrondies en rognons qui ont parfois \u00e9clat\u00e9 en formes anguleuses (voir aussi mon blog du 14\/12\/2016). Jacques-Marie Bardintzeff, … Continuer la lecture de Silex \u00e0 Bozzhyra, Kazakhstan<\/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":[21,1818,639,647,175,1454,1846,651,1847,13],"class_list":["post-5442","post","type-post","status-publish","format-standard","hentry","category-voyages","tag-bardintzeff","tag-bozzhyra","tag-calcaire","tag-craie","tag-geologue","tag-kazakhstan","tag-rognon","tag-silex","tag-silice","tag-volcanologue"],"yoast_head":"\nSilex \u00e0 Bozzhyra, Kazakhstan, 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\/2020\/01\/04\/silex-a-bozzhyra-kazakhstan\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Silex \u00e0 Bozzhyra, Kazakhstan, par Jacques-Marie Bardintzeff\" \/>\n<meta property=\"og:description\" content=\"\u00c0 Bozzhyra au Kazakhstan (voir mon blog du 14\/12\/2019 et du 3\/1\/2020), on d\u00e9couvre un niveau riche en blocs sombres sur la craie blanche\u00a0: il s\u2019agit de masses de silex, d\u2019une taille pouvant d\u00e9passer 10 centim\u00e8tres, souvent arrondies en rognons qui ont parfois \u00e9clat\u00e9 en formes anguleuses (voir aussi mon blog du 14\/12\/2016). 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