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Rb-Sr, Sm-Nd, and Pb isotope systematics of pyrite; implications for the age and genesis of lode gold deposits

Yang Jinhui and Zhou Xinhua
Rb-Sr, Sm-Nd, and Pb isotope systematics of pyrite; implications for the age and genesis of lode gold deposits
Geology (Boulder) (August 2001) 29 (8): 711-714

Abstract

Lode gold deposits commonly consist of pyrite and lesser amounts of lead and zinc sulfides accompanied by quartz and calcite. Their exact origin remains controversial mainly because of the scarcity of reliable geochronological data. Here we present direct Rb-Sr dating of pyrite from a lode gold deposit and propose the method as a useful geochronological technique for gold mineralization for which age data are poor. A positive correlation between present-day (super 87) Sr/ (super 86) Sr and (super 87) Rb/ (super 86) Sr ratios of pyrite (FeS (sub 2) ) subsamples from the Linglong gold mine of China corresponds to an age of 122-123 Ma, which dates the age of gold mineralization. The Sr, Nd, and Pb isotopic compositions of pyrites and the associated rocks suggest that the hydrothermal fluids responsible for the pyrite and gold mineralization were probably derived from a mixed source (i.e., degassing of mafic magmas and meteoric water that had leached the country rocks).


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 29
Serial Issue: 8
Title: Rb-Sr, Sm-Nd, and Pb isotope systematics of pyrite; implications for the age and genesis of lode gold deposits
Affiliation: Chinese Academy of Sciences, Institute of Geology and Geophysics, Beijing, China
Pages: 711-714
Published: 200108
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 24
Accession Number: 2001-076336
Categories: Economic geology, geology of ore depositsGeochronology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, geol. sketch map
N37°21'00" - N37°21'00", E120°22'60" - E120°22'60"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200124
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