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Hydrothermal alteration, mineralization, and structural geology of the Zijinshan high-sulfidation Au-Cu deposit, Fujian Province, southeast China

Jing Chen, David R. Cooke, Jose Piquer, David Selley, Lejun Zhang and Noel C. White
Hydrothermal alteration, mineralization, and structural geology of the Zijinshan high-sulfidation Au-Cu deposit, Fujian Province, southeast China
Economic Geology and the Bulletin of the Society of Economic Geologists (June 2019) 114 (4): 639-666

Abstract

Zijinshan is a world-class Au-Cu district located in southwest Fujian Province, southeast China. It contains a diverse array of ore deposits hosted by the Zijinshan granite complex and surrounding volcano-sedimentary rocks. Associated deposits include high-sulfidation epithermal gold-copper, intermediate-sulfidation epithermal polymetallic silver-base metal, and porphyry molybdenum-copper deposits. The Zijinshan high-sulfidation Au-Cu deposit is located in the middle of the Zijinshan district, and ore zones are hosted in, below, and adjacent to the Zijinshan lithocap. The host rocks are part of a Jurassic granite complex emplaced between 165 and 157 Ma. (super 40) Ar/ (super 39) Ar age spectra of hydrothermal alunite indicate that hydrothermal activity at Zijinshan occurred at 102.86 + or - 0.61 to 101.19 + or - 0.60 Ma and was associated with dacite porphyry dikes that intruded at 104.8 + or - 0.9 Ma. Hydrothermal activity produced pervasive silicic and advanced argillic alteration assemblages that are zoned from a central, massive quartz alteration domain, outward to massive quartz-dickite, disseminated quartz-alunite + or - dickite, and disseminated quartz-muscovite-dickite zones. Copper sulfides occur in hydrothermally cemented breccias, veins, and minor disseminations in granite; copper minerals include covellite, digenite, and minor enargite. Oxide Au ores are associated with strongly weathered silicic alteration in the upper parts of the deposit. A set of subvertical NE-striking faults were active prior to mineralization at Zijinshan. During mineralization, a NW-striking fault system controlled the emplacement of veins, breccias, and dacite dikes. Kinematic indicators show that most of the NW-striking faults were active as normal oblique faults during mineralization. Postmineralization ENE-striking dextral strike-slip faults are associated with minor conjugate NNW-striking faults. The premineralization structures at Zijinshan likely formed during NW-directed compression. Synmineralization structures formed under subvertical contraction and subhorizontal NNE-plunging extension. Postmineralization structures developed in a strike-slip regime defined by a NW-oriented axis of compression and NE-trending axis of extension. Changes in the styles of pre- and synmineralization structures are related to fluctuations in the regional stress regime. The transition from compression to extension was fundamental to mineralization. Postmineralization faults are related to transient local stress regime variations at the deposit scale.


ISSN: 0361-0128
EISSN: 1554-0774
Coden: ECGLAL
Serial Title: Economic Geology and the Bulletin of the Society of Economic Geologists
Serial Volume: 114
Serial Issue: 4
Title: Hydrothermal alteration, mineralization, and structural geology of the Zijinshan high-sulfidation Au-Cu deposit, Fujian Province, southeast China
Affiliation: University of Tasmania, Centre for Ore Deposit and Earth Sciences, Hobart, Tasmania, Australia
Pages: 639-666
Published: 201906
Text Language: English
Publisher: Economic Geology Publishing Company, Lancaster, PA, United States
References: 83
Accession Number: 2019-062098
Categories: Economic geology, geology of ore depositsStructural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. col., 7 tables, geol. sketch maps
N25°09'05" - N25°13'23", E116°20'40" - E116°28'25"
Secondary Affiliation: Universidad Austral de Chile, CHL, Chile
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Abstract, Copyright, Society of Economic Geologists. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201932
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