Élisabeth Le Goff , Catherine Guerrot , Gilbert Maurin , Véra Johan , Monique Tegyey , Mustapha Ben Zerga
{"title":"Découverte d'éclogites hercyniennes dans la chaı̂ne septentrionale des Mauritanides (Afrique de l'Ouest)","authors":"Élisabeth Le Goff , Catherine Guerrot , Gilbert Maurin , Véra Johan , Monique Tegyey , Mustapha Ben Zerga","doi":"10.1016/S1251-8050(01)01694-9","DOIUrl":null,"url":null,"abstract":"<div><p>Eclogites have been discovered within units constituting the prolongation of the Hercynian nappes of the Western Sahara (Northern Mauritanides). The eclogitic assemblage comprises Grt + Omp (Jd<sub>30–40</sub>) + barroisite + Qtz + Rt ± phengite + Ep. Estimated pressure–temperature conditions are 550–600<!--> <!-->°C, 13–15 kbar. Geochronological data obtained by the single evaporation method on zircons characterise a Panafrican event (595 Ma), which could be attributed to the magmatic crystallisation of the protolith. Sm–Nd dating by using garnet and omphacite argue for an Hercynian metamorphic event at 330 Ma.</p></div>","PeriodicalId":100301,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIA - Earth and Planetary Science","volume":"333 11","pages":"Pages 711-718"},"PeriodicalIF":0.0000,"publicationDate":"2001-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8050(01)01694-9","citationCount":"19","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Comptes Rendus de l'Académie des Sciences - Series IIA - Earth and Planetary Science","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1251805001016949","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 19
Abstract
Eclogites have been discovered within units constituting the prolongation of the Hercynian nappes of the Western Sahara (Northern Mauritanides). The eclogitic assemblage comprises Grt + Omp (Jd30–40) + barroisite + Qtz + Rt ± phengite + Ep. Estimated pressure–temperature conditions are 550–600 °C, 13–15 kbar. Geochronological data obtained by the single evaporation method on zircons characterise a Panafrican event (595 Ma), which could be attributed to the magmatic crystallisation of the protolith. Sm–Nd dating by using garnet and omphacite argue for an Hercynian metamorphic event at 330 Ma.
京公网安备 11010802042870号
京ICP备2023020795号-1
分享
求助内容：
应助结果提醒方式：
扫码关注我们
