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Ore-fluid evolution at the Getchell carlin-type gold deposit, Nevada, USA

Jean S. Cline and Albert H. Hofstra
Ore-fluid evolution at the Getchell carlin-type gold deposit, Nevada, USA (in Fluid inclusions in minerals, Ernst Burke (editor), Maria-Luce Frezzotti (editor) and Iain Samson (editor))
European Journal of Mineralogy (February 2000) 12 (1): 195-212


The mid-Tertiary ore assemblage at Getchell is superimposed on quartz-pyrite vein mineralization associated with a late Cretaceous granodiorite that intruded Lower Palaeozoic sedimentary rocks. Pre-ore quartz trapped fluids with a wide range of salinities (1-21 wt.% NaCl eqiv.), gas compositions (H (sub 2) O, CO (sub 2) and CH (sub 4) ) and T (120 to > 360 degrees C); O and H isotope ratios indicate a probable magmatic source. Ore-stage jasperoid contains moderate salinity, aqueous fluid inclusions trapped at 180-220 degrees C; the fluids minor CO (sub 2) and trace H (sub 2) S allowed reaction with host limestones and transport Au, respectively. As the hydrothermal system collapsed, fluid T declined to 155-115 degrees C and realgar and calcite precipitated. Inclusion fluids in ore-stage minerals have high delta D (sub H2O) and delta (super 18) O (sub H2O) values indicating that the fluid had a deep source of magmatic/metamorphic origin. Deeply sourced fluids rose along the Getchell fault system where they dissolved carbonate wall rocks and deposited Au-enriched pyrite and jasperoid quartz.

ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 12
Serial Issue: 1
Title: Ore-fluid evolution at the Getchell carlin-type gold deposit, Nevada, USA
Title: Fluid inclusions in minerals
Author(s): Cline, Jean S.Hofstra, Albert H.
Author(s): Burke, Ernsteditor
Author(s): Frezzotti, Maria-Luceeditor
Author(s): Samson, Iaineditor
Affiliation: University of Nevada, Geoscience Department, Las Vegas, NV, United States
Pages: 195-212
Published: 200002
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
Meeting name: 17th I.M.A. general meeting ; Fluid inclusions in minerals
Meeting location: Toronto, ON, CAN, Canada
Meeting date: 19980809Aug. 9-14, 1998
References: 55
Accession Number: 2000-027054
Categories: Economic geology, geology of ore deposits
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables, geol. sketch maps
N40°31'00" - N42°00'00", W119°20'60" - W117°00'00"
Secondary Affiliation: U. S. Geological Survey, USA, United States
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2021, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
Update Code: 200009
Program Name: USGSOPNon-USGS publications with USGS authors
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