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GEOREF RECORD

U-Pb chronology on accessory minerals of the Velay anatectic dome (French Massif Central)

Remy Mougeot, Jean-Patrick Respaut, Patrick Ledru and Christian Marignac
U-Pb chronology on accessory minerals of the Velay anatectic dome (French Massif Central)
European Journal of Mineralogy (February 1997) 9 (1): 141-156

Abstract

The U-Pb chronology of zircon, monazite and apatite from three samples of granite and gneiss from the S edge of the Velay dome has been studied. The earlier of two migmatization stages is constrained at 314 + or - 5 m.y. by the U-Pb data on abraded monazite from the leucosome part of a paragneiss; the later migmatization has been dated with monazites from the cordierite-bearing Velay granite at 301 + or - 5 m.y. Monazites from the paragneiss and the Velay granite even after an abrasion process are still discordant in the concordia diagram, and monazite from the third sample, an orthogneiss, reveal an unusual pattern with a reverse discordia. Zircons in each case demonstrate inheritance; even for the Velay granite where zircon fractions define a normal discordia pattern, single grain analyses reveal the presence of inherited lead. The apatites in all three samples yield an age of 289 + or - 5 m.y., which is interpreted as a cooling age during the uplift of the Velay region.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 9
Serial Issue: 1
Title: U-Pb chronology on accessory minerals of the Velay anatectic dome (French Massif Central)
Affiliation: Universite Montpellier II, CNRS, Montpellier, France
Pages: 141-156
Published: 199702
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 66
Accession Number: 1997-030098
Categories: Geochronology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables, geol. sketch maps
N44°00'00" - N47°00'00", E00°45'00" - E05°00'00"
Secondary Affiliation: BRGM, FRA, FranceCRPG-CNRS, FRA, France
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199710
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