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Contributions to Mineralogy and Petrology (Historical Archive)
Publisher: Springer-Verlag GmbH
ISSN: 0010-7999 (Paper) 1432-0967 (Online)
DOI: 10.1007/BF00310464
Issue: Volume 112, Numbers 2-3
Date:
November 1992
Pages: 329 - 340
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Highly reducing conditions during Alpine metamorphism of the Malenco peridotite (Sondrio, northern Italy) indicated by mineral paragenesis and H 2 in fluid inclusions Adolf Peretti1, 6
, Jean Dubessy2, Josef Mullis3, B. Ronald Frost4 and V. Trommsdorff5 | (1) | Institut für Mineralogie und Petrographic, ETH, Sonneggstrasse 5, CH-8092 Zurich, Switzerland |
| (2) | GS CNRS 077, CREGU, BP 23, F-54501 Vandoeuvre-Les-Nancy Cedex, France |
| (3) | Mineralogisch Petrographisches Institut der Universität, Bernoullistrasse 30, CH-4056 Basel, Switzerland |
| (4) | Department of Geology and Geophysics, University of Wyoming, 82071 Laramie, WY, USA |
| (5) | Institut für Mineralogie und Petrographie, ETH, Sonneggstrasse 5, CH-8092 Zurich, Switzerland |
| (6) | Present address: Kehlhofweg 4, 6043 Adligenswil, Switzerland |
Received: 12 April 1991 Accepted: 19 June 1992 Abstract During regional metamorphism of the Malenco serpentinized peridotite (Sondrio, northern Italy), the mineral assemblage pentlandite-awaruite-magnetite-native copper-antigorite-brucite-olivine-diopside is formed. The opaque assemblage indicates very reduced fluids with fO 2 values 4 log units below QFM. Primary fluid inclusions were trapped in diopside overgrowth, contemporaneous with the opaque assemblage. These metamorphic fluids are saline aqueous solutions (about 10.4 mol% NaCl equivalent) and contain molecular H 2 of approximately 1 mol%, as shown by micro-Raman analysis and microthermometry. The fluids are interpreted to have been formed during deserpentinization at the olivine-in isograd under strong reducing conditions.
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Link to article: http://springerlink.metapress.com/link.asp?ID=R7305T0J04P43M62
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