Alain Cocherie , Jean Chantraine , C.Mark Fanning , Marie-Pierre Dabard , Florentin Paris , Alain Le Hérissé , Emmanuel Égal
{"title":"Datation U/Pb : âge Briovérien de la série d'Erquy (Massif armoricain, France)","authors":"Alain Cocherie , Jean Chantraine , C.Mark Fanning , Marie-Pierre Dabard , Florentin Paris , Alain Le Hérissé , Emmanuel Égal","doi":"10.1016/S1251-8050(01)01669-X","DOIUrl":null,"url":null,"abstract":"<div><p>New U/Pb analyses obtained with a high-resolution ion microprobe (SHRIMP) fix an age of 608 ±7 Ma for spilites of the Erquy series, in Cadomian rocks of the Armorican massif, France. This Neoproterozoic age re-integrates this unit into the Brioverian, the age it was initially assigned to. A Rb/Sr whole-rock dating in the 1970s had undermined the regional Cadomian model, by suggesting an Ordovician age for these rocks; this was apparently further supported by the discovery of organic remains, interpreted as Palaeozoic microfossils. The reassessment of this palaeontological attribution and the new isotope dating are a final confirmation of the age of this series.</p></div>","PeriodicalId":100301,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIA - Earth and Planetary Science","volume":"333 8","pages":"Pages 427-434"},"PeriodicalIF":0.0000,"publicationDate":"2001-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1251-8050(01)01669-X","citationCount":"5","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/S125180500101669X","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 5
Abstract
New U/Pb analyses obtained with a high-resolution ion microprobe (SHRIMP) fix an age of 608 ±7 Ma for spilites of the Erquy series, in Cadomian rocks of the Armorican massif, France. This Neoproterozoic age re-integrates this unit into the Brioverian, the age it was initially assigned to. A Rb/Sr whole-rock dating in the 1970s had undermined the regional Cadomian model, by suggesting an Ordovician age for these rocks; this was apparently further supported by the discovery of organic remains, interpreted as Palaeozoic microfossils. The reassessment of this palaeontological attribution and the new isotope dating are a final confirmation of the age of this series.
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