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Re-Os age of polymetallic Ni-Mo-PGE-Au mineralization in Early Cambrian black shales of south China; a reassessment

Lingang Xu, Bernd Lehmann, Mao Jingwen, Qu Wenjun and Du Andao
Re-Os age of polymetallic Ni-Mo-PGE-Au mineralization in Early Cambrian black shales of south China; a reassessment
Economic Geology and the Bulletin of the Society of Economic Geologists (May 2011) 106 (3): 511-522

Abstract

The Early Cambrian Niutitang Formation in South China consists of a black shale sequence with a synsedimentary organic carbon-rich polymetallic sulfide layer with extreme metal enrichment locally mined as Ni-Mo-PGE-Au ore. We report a new composite Re-Os isochron age of the sulfide ore layer of 521+ or -5 Ma (n=14) from three mine sites (Dazhuliushui and Maluhe in the Guizhou province and Sancha in the Hunan province) several hundred kilometers apart. This age corresponds to the biostratigraphic Tommotian age, and is in agreement with recent interpolated Pb-Pb and SHRIMP zircon U-Pb ages from an underlying tuff unit. The initial (super 187) Os/ (super 188) Os value of the sulfide ore is 0.87 + or - 0.07, which is equal to the initial (super 187) Os/ (super 188) Os ratio of approximately 0.80 of the black shale host rock, consistent with the seawater origin of the metals under depositional conditions of very low clastic input.


ISSN: 0361-0128
EISSN: 1554-0774
Coden: ECGLAL
Serial Title: Economic Geology and the Bulletin of the Society of Economic Geologists
Serial Volume: 106
Serial Issue: 3
Title: Re-Os age of polymetallic Ni-Mo-PGE-Au mineralization in Early Cambrian black shales of south China; a reassessment
Affiliation: Technical University of Clausthal, Mineral Resources, Clausthal-Zellerfeld, Germany
Pages: 511-522
Published: 201105
Text Language: English
Publisher: Economic Geology Publishing Company, Lancaster, PA, United States
References: 60
Accession Number: 2011-050391
Categories: Economic geology, geology of ore depositsGeochronology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. cols., 2 tables, geol. sketch maps
N24°40'00" - N29°19'60", E103°00'00" - E109°30'00"
N24°40'00" - N30°10'00", E109°00'00" - E114°15'00"
Secondary Affiliation: China Academy of Geological Sciences, Institute of Mineral Resources, CHN, ChinaNational Research Center of Geoanalysis, CHN, China
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Society of Economic Geologists. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201128
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