{"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\/es\/2022\/04\/08\/laterites-et-bauxites-des-archives-climatiques-et-geodynamiques\/","title":{"rendered":"Lateritas y bauxitas: archivos clim\u00e1ticos y geodin\u00e1micos"},"content":{"rendered":"<div id=\"fws_69f58474278d4\"  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 una conferencia sobre lateritas y bauxitas el lunes 11 de abril, de 12.30 a 14.00 horas, en el aula C de la Universidad de Guayana. Mostrar\u00e1 c\u00f3mo estas formaciones geol\u00f3gicas pueden utilizarse para documentar y datar cambios en el clima de Guyana. En particular, hablar\u00e1 de los primeros resultados obtenidos a partir del estudio de muestras de la Monta\u00f1a de Kaw y de la 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>n la zona intertropical, la intensa meteorizaci\u00f3n de las rocas provoca la lixiviaci\u00f3n de determinados elementos qu\u00edmicos, como los nutrientes, y la acumulaci\u00f3n de elementos insolubles como el Fe, el Al y el Si. En escalas temporales del orden de millones de a\u00f1os, minerales superg\u00e9nicos como los \u00f3xidos de hierro y aluminio y la caolinita cristalizan para formar un perfil later\u00edtico mineral\u00f3gicamente compartimentado. Cuando el clima es m\u00e1s c\u00e1lido o cambian las condiciones hidrol\u00f3gicas, la caolinita puede disolverse y formar gibbsita, transformando la laterita en bauxita. Las lateritas y las bauxitas contienen, por tanto, minerales que dan testimonio de las condiciones clim\u00e1ticas y geodin\u00e1micas del pasado que permitieron su formaci\u00f3n y conservaci\u00f3n. Estudios anteriores han demostrado que las lateritas y bauxitas se formaron epis\u00f3dicamente a lo largo de la historia de la Tierra, sobre todo en zonas de quiescencia tect\u00f3nica. Sin embargo, su dataci\u00f3n es muy dif\u00edcil debido a la ausencia o escasez de minerales datables, y persisten muchas incertidumbres en cuanto al alcance temporal y espacial de estos episodios de alteraci\u00f3n.<\/p>\n<p>Para extraer mejor la informaci\u00f3n clim\u00e1tica y geodin\u00e1mica de las lateritas, podemos demostrar que la combinaci\u00f3n de estudios mineral\u00f3gicos, geoqu\u00edmicos y geocronol\u00f3gicos (U-Th)\/He de las hematitas y goethitas de estos objetos proporciona informaci\u00f3n cuantitativa sobre la evoluci\u00f3n de la corteza continental y las condiciones clim\u00e1ticas. Estamos especialmente interesados en la historia de la alteraci\u00f3n del Escudo Guayan\u00e9s, que se cree que ha sido tect\u00f3nicamente estable en latitudes tropicales desde el Cret\u00e1cico. Se ha propuesto la existencia de varias paleosuperficies correspondientes a distintas fases de peneplanaci\u00f3n con edades comprendidas entre el Cret\u00e1cico Superior y el reciente. Muchas de estas paleosuperficies est\u00e1n cubiertas por gruesos perfiles later\u00edticos que atestiguan una larga historia de meteorizaci\u00f3n tropical. Sin embargo, los episodios de meteorizaci\u00f3n no est\u00e1n bien acotados en el tiempo y en el espacio, ya que s\u00f3lo existen unos pocos conjuntos de datos sobre la edad de la meteorizaci\u00f3n y las limitaciones sedimentol\u00f3gicas. Los datos geocronol\u00f3gicos obtenidos permiten discutir las fases de alteraci\u00f3n que han afectado al Crat\u00f3n Guayan\u00e9s desde el Eoceno, y en la Guayana Francesa desde el Oligoceno. Mediante la combinaci\u00f3n de estudios multim\u00e9todo, tambi\u00e9n podemos demostrar que las condiciones clim\u00e1ticas cambiaron a finales del Mioceno, volvi\u00e9ndose m\u00e1s h\u00famedas y permitiendo el desarrollo de la bauxita en la regi\u00f3n costera atl\u00e1ntica del Crat\u00f3n Guayan\u00e9s.<\/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 una charla el lunes 11 de abril, de 12.30 a...","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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