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Paleotemperatures inferred from fluid inclusions in diagenetic cements; implications for the thermal history of the Paris Basin

Nicole Guilhaumou
Paleotemperatures inferred from fluid inclusions in diagenetic cements; implications for the thermal history of the Paris Basin
European Journal of Mineralogy (December 1993) 5 (6): 1217-1226

Abstract

Fluid inclusions in cements in limestones and sandstones from six boreholes from Toarcian, Hettangian, Keuper, Rhaetian and Dogger strata were sampled in cores where carbonate cements were most abundant. The trapping T inferred from microthermometric measurements are 25-45 degrees C higher than those derived from present-day geothermal gradients calculated from drilling data (except for Dogger limestones which have late calcite cements yielding values close to present-day T). Salinities are high (10- 22 wt.% eq. NaCl), suggesting circulation of brine from the Keuper into other Mesozoic strata. The higher T indicated may have occurred during the late Cretaceous, in agreement with K/Ar and fission-track dating. The authors suggest that these higher thermal gradients may have been caused by the blanketing effect of Chalk deposits without any variation in the basal flux.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 5
Serial Issue: 6
Title: Paleotemperatures inferred from fluid inclusions in diagenetic cements; implications for the thermal history of the Paris Basin
Author(s): Guilhaumou, Nicole
Affiliation: l'Ecole Normale Superieure, Departement de Geologie, Paris, France
Pages: 1217-1226
Published: 199312
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 40
Accession Number: 1994-001556
Categories: Sedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, geol. sketch map
N48°00'00" - N50°00'00", E01°00'00" - E05°00'00"
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199401
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