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- Title
Geology, Geochemistry and Genesis of the Hongshijing Gold Deposit in Ruoqiang, Xinjiang.
- Authors
Xiao Huiliang; Zhou Jiyuan; Wang Henian, M. A.; Cui Bingfang, M. A.; Chen Shizhong
- Abstract
The Hongshijing gold deposit, which occurs in the Middle and Late Carboniferous volcanic and pyroclastic rocks, is of the brittle-ductile shear zone type controlled by a rift belt. The Hongshijing gold deposit is one controlled by a brittle shear zone located in the Late Paleozoic rift zone. The altered-rock type and quartz type orebodies are contained in the gold-bearing formation, which consists of basalt and tuffaceous sandstone. The major mineralizing stage is at 267-261 Ma and reiteration mineralizing stage at 220-209 Ma. The ore minerals include pyrite, magnetite, copper, bornite, ferrohydrite, native gold, and the gangue minerals include quartz, sercite, calcite, Fe-dolomite, leuxocne, anorthose, biotite, baria, cajuelite, and agustine. The wall rock alteration associated with gold mineralization. The contents of gold are 2.4 x 10[sup-9] in the gold-bearing formation, 5.7 x 10[sup-9] in the tuffaceous sandstone and 1.4 - 1.5 x 10sup[-9] in the basalt. Au is associated with Te, Se, Ni, Cu. Au = 74.331 x Te + 0.0335 x Ni - 0.211 x Cu - 2.650. Geochemical investigations revealed that the mineralizing materials came from the basalts and tuffaceous sandstone in the gold-bearing formation. Under the action of ductile brittle shear structure, the gold-bearing formation was metamorphosed and altered, and the ore-forming materials activated, migrated and mineralized. The mineralizing fluid shows three mineralizing stages, with the characteristics of middle to low temperature (381 - 115°C) and middle to low mass fractions of NaCl (2.18% - 16.77%). The Fluid is of the Ca&sup2+; -Mg&sup2+; -Na[sup+] -Cl[sup-] type and H[sub2]O-NaCl system. According to the data from hydrogen and oxygen isotopic composition (δD = -114.6‰- -68.8‰, δ [sup18]O[subH2O] = -2.47‰ - 5.91‰), the conclusion can be drawn that the mineralizing fluid of the Hongshijing gold deposit was a kind of mixed hydrothermal solution composed mainly of meteoric...
- Subjects
GOLD; ROCKS; BASALT; RIFTS (Geology); BIOTITE
- Publication
Chinese Journal of Geochemistry, 2003, Vol 22, Issue 3, p280
- ISSN
1000-9426
- Publication type
Article
- DOI
10.1007/BF02842872