Formational Conditions For the Binntal Emerald Occurrence, Valais, Switzerland: Fluid Inclusion, Chemical Composition, and Stable Isotope Studies

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Secondary document(s)
Sous embargo indéterminé.
State: Public
Version: Final published version
Serval ID
serval:BIB_1D591975D51C
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Formational Conditions For the Binntal Emerald Occurrence, Valais, Switzerland: Fluid Inclusion, Chemical Composition, and Stable Isotope Studies
Journal
The Canadian Mineralogist
Author(s)
Marshall D., Meisser N., Ellis S., Jones P., Bussy F., Mumenthaler T.
ISSN
0008-4476
1499-1276
Publication state
Published
Issued date
2017
Peer-reviewed
Oui
Volume
55
Pages
725-741
Language
english
Abstract
Emerald from the Binntal occurrence in the Canton of Valais in Switzerland has been studied to determine its chemical zonation, stable isotopic signatures, depositional-fluid characteristics, pressure-temperature emplacement conditions, and formational model. The emerald is vanadium-rich, with optical and blue cathodoluminescence zoning related to chemical variations, primarily in V2O3 concentrations. The hydrogen isotope signature of the emerald channel fluids is unique and in agreement with previously identified high-altitude (deuterium-depleted) Alpine-age meteoric fluids. Field studies, fluid inclusion analyses, and oxygen isotope thermometry are consistent with a metamorphic formational model for the Binntal emerald at temperatures and hydrostatic pressures ranging from 200 to 400 8C and 100 to 250 Mpa, respectively. This corresponds to formational depths on the order of 4 to 9 km and fluids consistent with a 10–20 Ma CO2-dominant fluid with approximate mole percentages of 84.0, 11.9, 1.5, 1.3, 0.3, and 0.5 for CO2, H2O, CH4, N2, H2S, and NaCl, respectively.
Keywords
Geochemistry and Petrology
Web of science
Publisher's website
Create date
08/12/2017 15:01
Last modification date
20/08/2019 12:53
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