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Re‐Os Dating of Sulfides from the Volcanogenic Massive Sulfide Deposit at Gacun, Southwestern China
Author(s) -
Hou Zengqian,
Wang Shuxian,
Du Andao,
Qu Xiaoming,
Sun Weidong
Publication year - 2003
Publication title -
resource geology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.597
H-Index - 43
eISSN - 1751-3928
pISSN - 1344-1698
DOI - 10.1111/j.1751-3928.2003.tb00179.x
Subject(s) - isochron , geology , sulfide , geochemistry , radiometric dating , isochron dating , mineralization (soil science) , geochronology , seafloor spreading , mineralogy , paleontology , chemistry , organic chemistry , soil science , soil water
. The Re‐Os isotopic compositions of sulfide ores were analyzed for the Gacun, a volcanogenic massive sulfide deposit in southwestern China, to constrain the timing of mineralization. Sulfide ores from the deposit have a wide range of Re and Os concentrations, varying from 80.2 to 1543.2 ppb and from 0.307 to 8.83 ppb, respectively, and yielded a limited field of high 187 Re/ 188 Os and high 187 Os/188Os ratios, ranging from 1452 to 3309 and from 5.77 to 13.24, respectively. All sulfide samples yielded an isochron with an age of 217±28 Ma and an initial 187 Os/ 188 Os ratio of around 0.52±0.73. The Re‐Os isochron age agrees with ages previously constrained by the other isotopic dating of the host rocks and fossil strata for the deposit. The rhythmic variation in 187 Os/ 188 Os and 187 Re/ 188 Os ratios within massive sulfide zone records a complicated process for ore‐forming fluids episodically vented into the brine pool on the Mesozoic seafloor.