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Ore geology, fluid inclusion, and stable isotope constraints on the origin of the Damoqujia gold deposit, Jiaodong Peninsula, China

Chai Peng, Zhang Hongrui, Hou Zengqian, Zhang Zhiyu and Dong Leilei
Ore geology, fluid inclusion, and stable isotope constraints on the origin of the Damoqujia gold deposit, Jiaodong Peninsula, China
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre (December 2020) 57 (12): 1428-1446

Abstract

The Damoqujia gold deposit within the Zhaoping Fault Zone on Jiaodong Peninsula in eastern China is hosted primarily by Mesozoic granitoids and contains >60 t of gold, making it an important gold producer. Three mineralization stages are distinguished (early, middle, and late): (K-feldspar)-sericite-quartz-pyrite, quartz-gold-polymetallic sulfides, and quartz-carbonate. Gold deposition occurred mainly in the middle stage. The primary fluid inclusions of three stages are mainly homogenized at temperatures of 236-389, 191-346, and 104-251 degrees C, with salinities of 2.96-11.33, 1.39-17.28, and 0.53-11.48 wt.% NaCl equivalent, respectively. Fluid inclusion studies indicate that the metallogenic system evolved from CO2-rich mesothermal homogeneous fluids to CO2-poor aqueous fluids due to inputs of meteoric waters. The gold was carried as a bisulfide complex in the ore-forming fluids. Precipitation of gold was caused by a combination of fluid immiscibility and water-rock interaction. Studies of the fluid inclusion characteristics (medium temperature, CO2-rich, and low salinity H2O-CO2-NaCl homogeneous system), hydrogen and oxygen isotopes (=-1.0 ppm to 7.6 ppm, delta D=-109 ppm to -77 ppm), sulfur values (=4.5 ppm to 8.5 ppm), and regional geological events show that the ore-forming fluids reservoir was likely metamorphic in origin. Based on the immiscibility of fluid inclusion assemblages, the estimated depth and pressure of trapping are 8.3-10.2 km and 83-276 MPa, respectively, corresponding to the depth and pressure of mineralization.


ISSN: 0008-4077
EISSN: 1480-3313
Coden: CJESAP
Serial Title: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre
Serial Volume: 57
Serial Issue: 12
Title: Ore geology, fluid inclusion, and stable isotope constraints on the origin of the Damoqujia gold deposit, Jiaodong Peninsula, China
Affiliation: Chinese Academy of Geological Science, Institute of Geology, Beijing, China
Pages: 1428-1446
Published: 202012
Text Language: English
Summary Language: French
Publisher: National Research Council of Canada, Ottawa, ON, Canada
References: 118
Accession Number: 2021-010133
Categories: Economic geology, geology of ore depositsIsotope geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sect., 4 tables, geol. sketch maps
N37°28'00" - N37°31'00", E120°31'60" - E120°37'60"
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2021, American Geosciences Institute. Reference includes data from Canadian Science Publishing, NRC Research Press, Ottawa, ON, Canada. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 202103
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