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He-Ar-H-O isotopic signatures in Au\Ag bearing ore fluids of the Sunshin epithermalgold-silver ore deposits, South Korea

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Title
He-Ar-H-O isotopic signatures in Au\Ag bearing ore fluids of the Sunshin epithermalgold-silver ore deposits, South Korea
Authors
K.H. Kikm
K. Nagao
Lee, Jong Ik
K. Yang
H. Sumino
S. Lee
Subject
Geochemistry & Geophysics
Keywords
Epithermal gold-silver ore dep; Sunshin gold-silver deposits; fluid inclusions; mantle helium; oxygen isotopes
Issue Date
2012
Publisher
Elsevier
Citation
K.H. Kikm, et al. 2012. "He-Ar-H-O isotopic signatures in Au\Ag bearing ore fluids of the Sunshin epithermalgold-silver ore deposits, South Korea". Chemical Geology, 320-321(0): 128-139.
Abstract
Helium (3He/4He), argon (40Ar/36Ar) and oxygen (18O/16O) isotopic ratios in fluid inclusions trapped in quartz and pyrite from the Sunshin epithermal gold-silver ore deposits in South Korea were analyzed to investigate the magmatic contribution to ore forming fluids. Mantle helium with high 3He/4He ratios (up to 3He/4He~9RA, where RA=1.4×10?6 for air) were identified from fluid inclusions in auriferous quartz veins, which are characterized as low sulfidation (adularia-sericite) type. The ratios provide direct evidence of links between low sulfidation ore fluids in epithermal gold deposits and magma from a mantle source. Interestingly, the oxygen and hydrogen isotopic compositions of the ore fluids (δ18O=?1.9 to ?6.6‰, δD=?82 to?100‰), calculated from ore quartz, indicate that meteoric waters were predominant during precipitation of the Au\\\\\\\\\\\\\\\\Ag ore. Microthermometric measurements for fluid inclusions indicate relatively low temperatures (≤300 °C) for the formation of the low sulfidation epithermal ore deposits.ribution to ore forming fluids. Mantle helium with high 3He/4He ratios (up to 3He/4He~9RA, where RA=1.4×10?6 for air) were identified from fluid inclusions in auriferous quartz veins, which are characterized as low sulfidation (adularia-sericite) type. The ratios provide direct evidence of links between low sulfidation ore fluids in epithermal gold deposits and magma from a mantle source. Interestingly, the oxygen and hydrogen isotopic compositions of the ore fluids (δ18O=?1.9 to ?6.6‰, δD=?82 to?100‰), calculated from ore quartz, indicate that meteoric waters were predominant during precipitation of the Au\\\\\\\\\\\\\\\\Ag ore. Microthermometric measurements for fluid inclusions indicate relatively low temperatures(≤300 °C) for the formation of the low sulfidation epithermal ore deposits.
URI
http://repository.kopri.re.kr/handle/201206/6235
DOI
http://dx.doi.org/10.1016/j.chemgeo.2012.05.027
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