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Helium and Argon Isotope Geochemistry of Ore‐Forming Fluids in Zhemulang Gold Deposit in Southern Tibet, China
Author(s) -
ZHOU Feng,
SUN Xiaoming,
ZHAI Wei,
ZHANG Xiangguo,
YI Jianzhou
Publication year - 2014
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/1755-6724.12375_88
Subject(s) - china , chinese academy of sciences , geological survey , geology , geochemistry , mining engineering , earth science , archaeology , geography , geophysics
Zhemulang gold deposit is located to the south of the east section of YarlungZangbo suture zone in the southern Tibet. The gold ore bodies are controlled by the secondary brittle fractures in the large-scale brittle-ductile shear zone. The gold-bearing veins occur in the Upper Triassic Songre Formation, consisting of carbonaceous phyllite and slate. Ore minerals include native gold, pyrite, galena, chalcopyrite, sphalerite and limonite. The gangue minerals are mainly quartz, with trace amounts of calcite. The deposits have been well characterized using multiple geochemical and microthermometric methods, the results of which are consistent with the characteristics of orogenic gold deposit (Zhou et al., 2011 and Zhai et al., 2014). The hydrogen and oxygen isotopic composition show that the ore forming fluids are mainly metamorphic water, but it is not clear if mantle-derived volatiles added to crustal fluids during the ore-forming process.