{"id":39,"date":"2019-06-11T18:53:11","date_gmt":"2019-06-11T17:53:11","guid":{"rendered":"http:\/\/hebergement.u-psud.fr\/MineralogieGEOPS\/?page_id=39"},"modified":"2024-12-21T02:19:35","modified_gmt":"2024-12-21T01:19:35","slug":"thermo-chronologie-traces-de-fission","status":"publish","type":"page","link":"https:\/\/hebergement.universite-paris-saclay.fr\/MineralogieGEOPS\/?page_id=39","title":{"rendered":"Thermochronologie Traces de Fission"},"content":{"rendered":"\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"justify-text\">La plateforme dispose d\u2019un microscope LEICA DLML muni d\u2019une surplatine \u00e0 d\u00e9placement automatique en X-Y permettant de faciliter la d\u00e9termination de l\u2019\u00e2ge traces de fission et d\u2019une chambre \u00e0 dessin permettant de mesurer la longueur des traces confin\u00e9es. Le laboratoire dispose en outre du mat\u00e9riel n\u00e9cessaire pour s\u00e9parer les cristaux d\u2019apatite (broyeur, tamis, s\u00e9paration densim\u00e9trique et magn\u00e9tique) et pour la r\u00e9alisation des montages (polissage).<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><a href=\"http:\/\/hebergement.universite-paris-saclay.fr\/MineralogieGEOPS\/wp-content\/uploads\/2024\/12\/microscopeft.jpg\"><img decoding=\"async\" loading=\"lazy\" width=\"297\" height=\"225\" src=\"http:\/\/hebergement.universite-paris-saclay.fr\/MineralogieGEOPS\/wp-content\/uploads\/2024\/12\/microscopeft.jpg\" alt=\"\" class=\"wp-image-300\"\/><\/a><\/figure><\/div>\n\n\n<h6 class=\"wp-block-heading\">Principe de l\u2019analyse :<\/h6>\n\n\n\n<p class=\"justify-text\">Cette technique est bas\u00e9e sur l\u2019effacement progressif de d\u00e9fauts cristallins li\u00e9 \u00e0 la fission naturelle des atomes de 238U pour des temp\u00e9ratures comprises entre 60 et 110\u00b0C. Elle permet de d\u00e9terminer les pal\u00e9otemp\u00e9ratures dans cette intervalle et de pr\u00e9ciser \u00e0 quelle \u00e9poque ces temp\u00e9ratures ont r\u00e9gn\u00e9.<\/p>\n\n\n\n<h6 class=\"wp-block-heading\">Analyses r\u00e9alis\u00e9es sur l\u2019instrument :<\/h6>\n\n\n\n<p class=\"justify-text\">La thermochronologie par les traces de fission dans les cristaux d\u2019apatite est une m\u00e9thode de reconstitution de l\u2019histoire thermique et des mouvements verticaux des roches des premiers kilom\u00e8tres de la cro\u00fbte.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>La plateforme dispose d\u2019un microscope LEICA DLML muni d\u2019une surplatine \u00e0 d\u00e9placement automatique en X-Y permettant de faciliter la d\u00e9termination de l\u2019\u00e2ge traces de fission et d\u2019une chambre \u00e0 dessin permettant de mesurer la longueur des traces confin\u00e9es. Le laboratoire dispose en outre du mat\u00e9riel n\u00e9cessaire pour s\u00e9parer les cristaux d\u2019apatite (broyeur, tamis, s\u00e9paration densim\u00e9trique &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/hebergement.universite-paris-saclay.fr\/MineralogieGEOPS\/?page_id=39\" class=\"more-link\">Continuer la lecture<span class=\"screen-reader-text\"> de &laquo;&nbsp;Thermochronologie Traces de Fission&nbsp;&raquo;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"_links":{"self":[{"href":"https:\/\/hebergement.universite-paris-saclay.fr\/MineralogieGEOPS\/index.php?rest_route=\/wp\/v2\/pages\/39"}],"collection":[{"href":"https:\/\/hebergement.universite-paris-saclay.fr\/MineralogieGEOPS\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/hebergement.universite-paris-saclay.fr\/MineralogieGEOPS\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/hebergement.universite-paris-saclay.fr\/MineralogieGEOPS\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/hebergement.universite-paris-saclay.fr\/MineralogieGEOPS\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=39"}],"version-history":[{"count":7,"href":"https:\/\/hebergement.universite-paris-saclay.fr\/MineralogieGEOPS\/index.php?rest_route=\/wp\/v2\/pages\/39\/revisions"}],"predecessor-version":[{"id":500,"href":"https:\/\/hebergement.universite-paris-saclay.fr\/MineralogieGEOPS\/index.php?rest_route=\/wp\/v2\/pages\/39\/revisions\/500"}],"wp:attachment":[{"href":"https:\/\/hebergement.universite-paris-saclay.fr\/MineralogieGEOPS\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=39"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}