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Role of the Sardic tectonic phase in the metallogenesis of SW Sardinia (Iglesiente); lead isotope evidence

Cecile Caron, Joel Lancelot, Paolo Omenetto and Jean-Jacques Orgeval
Role of the Sardic tectonic phase in the metallogenesis of SW Sardinia (Iglesiente); lead isotope evidence
European Journal of Mineralogy (October 1997) 9 (5): 1005-1016

Abstract

Lead isotope analyses were applied to the major Pb-Zn ore deposits hosted in Lower Cambrian carbonates in SW Sardinia. The isotopic composition of Pb in barren Cambrian carbonates is less radiogenic than in ores and in adjacent wall-rocks. A minimum time gap of 60 m.y. is deduced between sediment deposition and ore emplacement. The Pb isotope ratios in Cambrian-hosted deposits are identical with those in Ordovician-hosted ores and in Ordovician conglomerates. These results are interpreted as indicating an epigenetic origin for these ore deposits during a Middle-Upper Ordovician event probably related to the 'Sardic distensive phase s.l.'.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 9
Serial Issue: 5
Title: Role of the Sardic tectonic phase in the metallogenesis of SW Sardinia (Iglesiente); lead isotope evidence
Affiliation: UMR-CNRS, ISTEEM, Montpellier, France
Pages: 1005-1016
Published: 199710
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 23
Accession Number: 1997-077050
Categories: Economic geology, geology of ore depositsIsotope geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: 2 tables
Secondary Affiliation: Universita di Padova, Padua, ITA, ItalyBRGM, Orleans, 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: 199724
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