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Fluid-inclusion and stable-isotope studies of gold-tungsten bearing hydrothermal deposits, Saucelle-Barruecopardo area, Spain

Juan F. Antona, Anthony E. Fallick and Garcia Sanchez
Fluid-inclusion and stable-isotope studies of gold-tungsten bearing hydrothermal deposits, Saucelle-Barruecopardo area, Spain
European Journal of Mineralogy (December 1994) 6 (6): 819-835

Abstract

In this area in the NW of Salamanca province, veins of quartz with fluid inclusions are associated with the Barruecopardo alkaline granite (311-326 m.y.). The fluid inclusions are of two types: 1) CO (sub 2) -H (sub 2) O inclusions, and 2) CO (sub 2) -rich inclusions; both types are related to the first two stages of mineralization in which Au is included in arsenopyrite. They are thought to represent immiscible fluids as they are primary and T (sub h) for both types are in the same range, with a maximum value of 428 degrees C; the calculated T of immiscibility ranges from 335 to 435 degrees C at P 1400-2100 bar. The Delta (super 34) S arsenopyrite values ( approximately 00/00) suggest a constant source of sulphur. Calculated Delta D (sub fluid) values are all D-enriched, but show considerable variability (-32 to -20/00 (sub SMOW) ), whereas Delta ^>18O (sub fluid) values show only a small variation (+7 to +10.30/00 (sub SMOW) ). These values are consistent with interaction between magmatic fluids and metamorphic rocks (from 0.1 to 0.01 fluid/rock ratios). The most likely mechanism for stage-I Au deposition is the loss of H (sub 2) S during fluid immiscibility.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 6
Serial Issue: 6
Title: Fluid-inclusion and stable-isotope studies of gold-tungsten bearing hydrothermal deposits, Saucelle-Barruecopardo area, Spain
Affiliation: Scottish Universities Research and Reactor Centre, Isotope Geology Unit, Glasgow, United Kingdom
Pages: 819-835
Published: 199412
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 67
Accession Number: 1995-007438
Categories: Economic geology, geology of ore depositsIsotope geochemistry
Document Type: Serial
Bibliographic Level: Analytic
N36°00'00" - N43°45'00", W09°30'00" - E04°30'00"
Secondary Affiliation: I.R.N.A.-C.S.I.C., ESP, Spain
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199503
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