On the significance of aragonite occurrences in the Western Alps

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Authors:Gillet, P.; Goffe, B.
Author Affiliations:Primary:
Univ. Rennes, Lab. Mineral. Phys., C. A. E. S. S. (CNRS), F-35042 Rennes Cedex, France
Volume Title:Contributions to Mineralogy and Petrology
Source:Contributions to Mineralogy and Petrology, 99(1), p.70-81. Publisher: Springer International, Heidelberg-New York, International. ISSN: 0010-7999
Publication Date:1988
Note:In English. 52 refs.; illus. incl. 1 table, geol. sketch maps
Summary:In the W Vanoise, aragonite formed under blueschist metamorphic conditions, whereas in the Queyras region it was precipitated under sub-surface conditions. An uplift P-T path of the Vanoise aragonite-bearing rocks has been constructed: 1) from T estimates using the Sr content of aragonite in successive veins and 2) from the kinetics of the aragonite-calcite solid-state transition. The uplift P-T path has an unusual shape with an important T decrease (100-150°C for a P decrease of 0.2 GPa) following blueschist metamorphism (P 0.7 GPa, T 300°C). Thermal models show that this unusual P-T path can be explained if a low T (125-175°C) was maintained at the base of the tectonic unit containing the aragonite-bearing rocks during part of its burial history, followed by the whole of its exhumation. [R.A.H.]
Subjects:Alkaline earth metals; Aragonite; Blueschist facies; Carbonates; Concentration; Exogene processes; Facies; Genesis; Geochemistry; Metals; Metamorphic rocks; Minerals; Models; P-T conditions; Petrology; Strontium; Uplifts; Alps; Europe; France; French Alps; Haute-Savoie France; Hautes-Alpes France; Savoie France; Savoy Alps; Vanoise; Western Alps; Western Europe; Queyras
Abstract Numbers:88M/6395
Record ID:1989059084
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom, Reference includes data from Geoline, Bundesanstalt fur Geowissenschaften und Rohstoffe
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