{"id":9371,"date":"2022-04-08T08:30:56","date_gmt":"2022-04-08T11:30:56","guid":{"rendered":"https:\/\/www.univ-guyane.fr\/?p=9371"},"modified":"2024-06-27T08:35:41","modified_gmt":"2024-06-27T11:35:41","slug":"laterites-et-bauxites-des-archives-climatiques-et-geodynamiques","status":"publish","type":"post","link":"https:\/\/www.univ-guyane.fr\/pt\/2022\/04\/08\/laterites-et-bauxites-des-archives-climatiques-et-geodynamiques\/","title":{"rendered":"Lateritas e bauxitas: arquivos clim\u00e1ticos e geodin\u00e2micos"},"content":{"rendered":"<div id=\"fws_69f5843c67473\"  data-column-margin=\"default\" data-midnight=\"dark\"  class=\"wpb_row vc_row-fluid vc_row\"  style=\"padding-top: 0px; padding-bottom: 0px; \"><div class=\"row-bg-wrap\" data-bg-animation=\"none\" data-bg-animation-delay=\"\" data-bg-overlay=\"false\"><div class=\"inner-wrap row-bg-layer\" ><div class=\"row-bg viewport-desktop\"  style=\"\"><\/div><\/div><\/div><div class=\"row_col_wrap_12 col span_12 dark left\">\n\t<div  class=\"vc_col-sm-12 wpb_column column_container vc_column_container col no-extra-padding inherit_tablet inherit_phone\"  data-padding-pos=\"all\" data-has-bg-color=\"false\" data-bg-color=\"\" data-bg-opacity=\"1\" data-animation=\"\" data-delay=\"0\" >\n\t\t<div class=\"vc_column-inner\" >\n\t\t\t<div class=\"wpb_wrapper\">\n\t\t\t\t\n<div class=\"wpb_text_column wpb_content_element  chapo\" >\n\t<h2>C\u00e9cile Gautheron (U. Paris-Saclay \/ U. de Grenoble) dar\u00e1 uma palestra sobre lateritas e bauxitas na segunda-feira, 11 de abril, das 12h30 \u00e0s 14h, no audit\u00f3rio C da Universidade da Guiana. Ela mostrar\u00e1 como essas forma\u00e7\u00f5es geol\u00f3gicas podem ser usadas para documentar e datar mudan\u00e7as no clima da Guiana. Em particular, ela discutir\u00e1 os resultados iniciais obtidos com o estudo de amostras da Montagne de Kaw e do Grand Conn\u00e9table.<\/h2>\n<\/div>\n\n\n\n\n<div class=\"wpb_text_column wpb_content_element\" >\n\t<p><span class=\"nectar-dropcap\" >D <\/span>a zona intertropical, o intenso desgaste das rochas leva \u00e0 lixivia\u00e7\u00e3o de certos elementos qu\u00edmicos, como nutrientes, e ao ac\u00famulo de elementos insol\u00faveis, como Fe, Al e Si. Em escalas de tempo da ordem de milh\u00f5es de anos, os minerais superg\u00eanicos, como \u00f3xidos de ferro e alum\u00ednio e caulinita, cristalizam-se para formar um perfil de laterita mineralogicamente compartimentado. Quando o clima \u00e9 mais quente ou as condi\u00e7\u00f5es hidrol\u00f3gicas mudam, a caulinita pode se dissolver e formar gibbsita, transformando a laterita em bauxita. Portanto, as lateritas e bauxitas cont\u00eam minerais que testemunham as condi\u00e7\u00f5es clim\u00e1ticas e geodin\u00e2micas do passado que permitiram sua forma\u00e7\u00e3o e preserva\u00e7\u00e3o. Estudos anteriores mostraram que as lateritas e bauxitas se formaram episodicamente ao longo da hist\u00f3ria da Terra, principalmente em zonas de quiesc\u00eancia tect\u00f4nica. No entanto, sua data\u00e7\u00e3o \u00e9 muito dif\u00edcil devido \u00e0 aus\u00eancia ou escassez de minerais dat\u00e1veis, e muitas incertezas permanecem quanto \u00e0 extens\u00e3o temporal e espacial desses eventos de altera\u00e7\u00e3o.<\/p>\n<p>A fim de extrair melhor as informa\u00e7\u00f5es clim\u00e1ticas e geodin\u00e2micas das lateritas, podemos mostrar que a combina\u00e7\u00e3o de estudos mineral\u00f3gicos, geoqu\u00edmicos e geocronol\u00f3gicos (U-Th)\/He das hematitas e goethitas nesses objetos fornece informa\u00e7\u00f5es quantitativas sobre a evolu\u00e7\u00e3o da crosta continental e das condi\u00e7\u00f5es clim\u00e1ticas. Estamos particularmente interessados na hist\u00f3ria de altera\u00e7\u00e3o do Escudo da Guiana, que se acredita ter sido tectonicamente est\u00e1vel em latitudes tropicais desde o Cret\u00e1ceo. Foi proposta a exist\u00eancia de v\u00e1rias paleossuperf\u00edcies correspondentes a diferentes fases de peneplana\u00e7\u00e3o com idades que variam do Cret\u00e1ceo tardio at\u00e9 o recente. Muitas dessas paleossuperf\u00edcies s\u00e3o cobertas por perfis later\u00edticos espessos que testemunham uma longa hist\u00f3ria de intemperismo tropical. No entanto, os epis\u00f3dios de intemperismo n\u00e3o s\u00e3o bem limitados no tempo e no espa\u00e7o, pois h\u00e1 apenas alguns conjuntos de dados sobre a idade do intemperismo e restri\u00e7\u00f5es sedimentol\u00f3gicas. Os dados geocronol\u00f3gicos obtidos possibilitam a discuss\u00e3o das fases de altera\u00e7\u00e3o que afetaram o Cr\u00e1ton da Guiana desde o Eoceno e, na Guiana Francesa, desde o Oligoceno. Combinando estudos com v\u00e1rios m\u00e9todos, tamb\u00e9m podemos demonstrar que as condi\u00e7\u00f5es clim\u00e1ticas mudaram no final do Mioceno, tornando-se mais \u00famidas e permitindo o desenvolvimento da bauxita na regi\u00e3o costeira atl\u00e2ntica do Cr\u00e1ton da Guiana.<\/p>\n<\/div>\n\n\n\n\n\t\t\t<\/div> \n\t\t<\/div>\n\t<\/div> \n<\/div><\/div>","protected":false},"excerpt":{"rendered":"C\u00e9cile Gautheron (U. Paris-Saclay \/ U. de Grenoble) dar\u00e1 uma palestra na segunda-feira, 11 de abril, das 12h30 \u00e0s...","protected":false},"author":1,"featured_media":9372,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"iawp_total_views":185,"footnotes":""},"categories":[9],"tags":[],"class_list":{"0":"post-9371","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-st"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Lat\u00e9rites et bauxites : des archives climatiques et g\u00e9odynamiques &#8212; Universit\u00e9 de Guyane<\/title>\n<meta name=\"description\" content=\"Explorez la formation des lat\u00e9rites et des bauxites dans les zones intertropicales. 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