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Lu P.-R.,China University of Geosciences | Gu X.-X.,China University of Geosciences | Li D.-R.,China University of Geosciences | Li D.-R.,Heilongjiang Mining Group Co. | And 2 more authors.
Geological Bulletin of China

Located in the Sankuanggou-Duobaoshan tectonic-metallogenic belt of Da Hinggan Mountains, the Sankuanggou Cu-Fe-Mo polymetallic deposit is a typical skarn deposit. Petrographic observation and microthermometric study were carried out for fluid inclusions from garnet at the anhydrous skarn stage (I), quartz at the hydrous skarn-oxide stage (II), quartz at the early sulfide stage (III) and calcite at the early late sulfide stage (IV). Petrographic observations reveal that various types of fluid inclusions are present in hydrothermal minerals of different ore-forming stages, comprising mainly vapor-liquid two-phase inclusions, subordinately vapor inclusions, and occasionally liquid inclusions as well as NaCl daughter mineral-bearing multiphase inclusions in quartz. Studies show that their homogenization temperatures vary from 152°C to 478°C, their salinities are 1.57~58.02 wt% NaCl, and their densities range from 0.64 g/cm3 to 1.18 g/cm3, thus belonging to the ore-forming system of medium-high temperature, medium-high salinity and medium density. In addition, mineralization pressures were calculated on the basis of homogenization temperatures and salinities, and the results show that the mineralization pressures vary from 39.44 MPa to 133.65 MPa, whereas the ore-forming depths are in the range of 3.94 km to 9.64 km, indicating that this ore deposit was formed in a mesogene ore-forming environment. Source

Li D.-R.,China University of Geosciences | Li D.-R.,Heilongjiang Mining Group Co. | Lv F.-U.,Heilongjiang Mining Group Co. | Liu S.-Y.,Heilongjiang Mining Group Co. | And 2 more authors.
Geology in China

The Sankuanggou Cu-Fe-Mo-Cu ore deposit is located in the northwest part of the famous Doubaoshan copper polymetallic metallogenic belt, Heilongjiang Province. In recent yearsl the resource exploration in crisis mines has been carried out at the edge and on the periphery of this ore deposit, and has discovered an independent Mo ore body and a Cu-Mo ore body of the cryptoexplosion breccia type as well as a gold mineralization belt related to the ductile -brittle shear zone. Therefore, some new understanding of the geological characteristics and mineralization regularity of this ore deposit has been obtained. This paper also summarized and analyzed hydrogeochemical indicators for ore-prospecting in this area, thus providing a more adequate basis for further exploration of medium-size or large-size copper polymetallic deposits. Source

Lv P.-R.,China University of Geosciences | Lv P.-R.,Xian Jiaotong University | Li D.-R.,Heilongjiang Mining Group Co. | Peng Y.-W.,China University of Geosciences | Zhang M.-Y.,China University of Geosciences
Geology in China

The Sankuanggou skarn-type Cu-Fe-Mo deposit occurs in the Sankuanggou- Duobaoshan tectonicmetallogenic belt of the Da Hinggan Mountains, and there exists close relationship between the formation of ore bodies and the intrusion of Sankuanggou multiple tonalite. Based on an analysis of the ore -forming geological conditions, the authors studied sulfur and lead isotopic compositions and zircon U-Pb dating data of ores from this ore deposit and, on such a basis, discussed the sources of ore-forming materials and the rock-forming and ore -forming epochs. Studies have shown that the composition of sulfur isotope varies gready and has a distributional effect of tower type, the δ 34SΣ s of the ore-forming hydrothermal system is about - 1.5%o, suggesting that sulfur was mainly derived from deep magmatic source, with a very small amount probably derived from the strata. The lead isotopic composition of ore sulfides indicates the derivation of lead from the mixed crust-mande materials, suggesting that the ore-forming materials came mainly from crust-mande mixing sources and were closely related to magmatism. The 206Pb/ 238U weighted mean ages of zircons range from (200±1)Ma to (168.18±0.96)Ma, which represent the intrusive time of tonalite and suggest that the rock-forming and ore forming epoch of the Sankuanggou Skarn-type Cu-Fe-Mo polymetallic deposit is Early Jurassic. Source

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