Published May 2002
| Version v1
Journal article
Discovery of an alkaline ortho gneiss in the eclogite-bearing Cellier unit (Champtoceaux complex, Armorican Massif): a new witness of the ordovician rifting
- 1. Rennes-1 Univ., Geosciences Rennes, UMR 6118, 35 (France)
- 2. Bureau de Recherches Geologiques et Minieres (BRGM), Analyse et caracterisation minerale, 75 - Paris (France)
Description
An alkaline orthogneiss from the Lower allochthon 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. (authors)
Additional details
Additional titles
- Original title (English)
- Decouverte d'un ortogneiss alcalin dans l'unite du cellier (complexe de Champtoceaux, Massif armoricain): un nouveau temoin du rifting ordovicien
Publishing Information
- Journal Title
- Comptes Rendus - Academie des Sciences. Geoscience
- Journal Issue
- no.5t.334
- Journal Page Range
- p. 303-311
- ISSN
- 1631-0713
- CODEN
- CRSPEA
INIS
- Country of Publication
- France
- Country of Input or Organization
- France
- INIS RN
- 33038276
- Subject category
- S58: GEOSCIENCES;
- Descriptors DEI
- GEOCHEMISTRY; GEOLOGIC HISTORY; GNEISSES; ISOTOPE DATING; ISOTOPE RATIO; LEAD ISOTOPES; MAGMATISM; MINERALOGY; NEODYMIUM ISOTOPES; ORDOVICIAN PERIOD; PETROGRAPHY; STRONTIUM ISOTOPES; ZIRCON
- Descriptors DEC
- AGE ESTIMATION; ALKALINE EARTH ISOTOPES; CHEMISTRY; GEOLOGIC AGES; GEOLOGY; ISOTOPES; METAMORPHIC ROCKS; MINERALS; PALEOZOIC ERA; ROCKS; SILICATE MINERALS
Optional Information
- Notes
- 39 refs.