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A pressure-temperature-time path for the NE Mont-Blanc massif; fluid-inclusion, isotopic and thermobarometric evidence

Daniel Marshall, Hans-Rudolf Pfeifer, Johannes C. Hunziker and David Kirschner
A pressure-temperature-time path for the NE Mont-Blanc massif; fluid-inclusion, isotopic and thermobarometric evidence (in ECROFI XIV (European Current Research on Fluid Inclusions) symposium, Michel Cathelineau and Jean Dubessy)
European Journal of Mineralogy (December 1998) 10 (6): 1227-1240

Abstract

The Mont-Chemin region at the NE extreme of the Mont-Blanc massif, Canton Valais, Switzerland is predominantly comprised of the granitic rocks of the Mont-Blanc intrusive rock suite and the Mont-Blanc basement gneisses. Fluid inclusions, fluid-mineral equilibria, stable-isotope and radiogenic-isotope studies have been used to derive pressure, temperature, age (PTt) and fluid-composition constraints for a number of Alpine events. The earliest of these events is recorded in a paragonite-katophorite schist hosted within the basement gneisses. The paragonites yield a (super 40) Ar/ (super 39) Ar age of 47 Ma. Mineral thermobarometry is consistent with formation temperatures in excess of 300 degrees C, with minimum pressures of 1500 bars. A well-defined pressure-temperature uplift path is recorded in minerals hosted by veins of different generations. The overall PTt path defines a geothermal gradient of 25 degrees C/km, but the younger portions of this PTt path are consistent with geothermal gradients slightly in excess of 50 degrees C/km, similar to those observed to the East along the Rhone-Simplon line.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 10
Serial Issue: 6
Title: A pressure-temperature-time path for the NE Mont-Blanc massif; fluid-inclusion, isotopic and thermobarometric evidence
Title: ECROFI XIV (European Current Research on Fluid Inclusions) symposium
Author(s): Marshall, DanielPfeifer, Hans-RudolfHunziker, Johannes C.Kirschner, David
Author(s): Cathelineau, Michel
Author(s): Dubessy, Jean
Affiliation: University of Lausanne, Institute of Mineralogy and Petrography, Lausanne, Switzerland
Affiliation: UMR, CREGU, Vandoeuvre-les-Nancy, France
Pages: 1227-1240
Published: 199812
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
Meeting name: ECROFI XIV (European Current Research on Fluid Inclusions) symposium
Meeting location: Nancy, FRA, France
Meeting date: 19970701July 1-4, 1997
References: 44
Accession Number: 1999-018595
Categories: Igneous and metamorphic petrology
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables, geol. sketch map
N45°52'00" - N46°37'60", E06°47'60" - E08°28'00"
Secondary Affiliation: Simon Fraser University, CAN, CanadaSaint Louis University, USA, United States
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 199907
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