Discovery of an alkaline orthogneiss in the eclogite-bearing Cellier Unit (Champtoceaux Complex, Armorican Massif): a new witness of the Ordovician rifting
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- 作者：Ballè ; vre ; Michel ; Capdevila ; Ramon ; Guerrot ; Catherine ; Peucat ; Jean-Jacques
- 关键词：alkaline orthogneiss ; Ordovician ; Variscan Belt ; Champtoceaux Complex ; Armorican massif ; France ; orthogneiss alcalin ; Ordovicien ; Chaî ; ne varisque ; complexe de Champtoceaux ; Massif armoricain ; France ; Gé ; omaté ; riaux ; Miné ; ralogie ; G
- 刊名：Comptes Rendus Geoscience
- 出版年：2002
- 出版时间：2002
- 年：2002
- 卷：334
- 期：5
- 页码：303-311
- 全文大小：226 K
文摘
An alkaline orthogneiss from the Lower Allochton of the Champtoceaux Complex has been identified by its mineralogy and its whole-rock chemistry, including trace elements and Sr and Nd isotopes. An U/Pb study of the zircons using the conventional method gives an upper intercept age of 481 +6/−5 Ma. The alkaline orthogneiss is thus a new witness of the Ordovician rifting in the Variscan Belt. To cite this article: M. Ballèvre et al., C. R. Geoscience 334 (2002) 303–311.