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Li T.,Chinese Academy of Geological Sciences | Wu G.,Chinese Academy of Geological Sciences | Liu J.,Chinese Academy of Geological Sciences | Wang G.,Chinese Academy of Geological Sciences | And 5 more authors.
Lithos | Year: 2016

The large Chaganbulagen Pb-Zn-Ag deposit is located in the Derbugan metallogenic belt of the northern Great Xing'an Range. The vein-style orebodies of the deposit occur in the NWW-trending fault zones. The ore-forming process at the deposit can be divided into three stages: an early quartz-pyrite-arsenopyrite-pyrrhotite-sphalerite-galena-chalcopyrite stage, a middle quartz-carbonate-pyrite-sphalerite-galena-silver-bearing minerals stage, and a late quartz-carbonate-pyrite stage. The sericite sample yielded a 40Ar-39Ar plateau age of 138±1Ma and an isochron age of 137±3Ma, and the zircon LA-ICP-MS U-Pb age of monzogranite porphyry was 143±2Ma, indicating that the ages of mineralization and monzogranite porphyry in the Chaganbulagen deposit should be the Early Cretaceous, and that the mineralization should be slightly later than the intrusion of monzogranite porphyry. There are only liquid inclusions in quartz veins of the Chaganbulagen deposit. Homogenization temperatures, densities, and salinities of the fluid inclusions from the early stage are 261-340°C, 0.65-0.81g/cm3, and 0.7-6.3wt.% NaCl eqv., respectively. Fluid inclusions of the middle stage have homogenization temperatures, densities, and salinities of 209-265°C, 0.75-0.86g/cm3, and 0.5-5.7wt.% NaCl eqv., respectively. For fluid inclusions of the late stage, their homogenization temperatures, densities, and salinities are 173-219°C, 0.85-0.91g/cm3, and 0.4-2.7wt.% NaCl eqv., respectively. The ore-forming fluids of the deposit are generally characterized by moderate temperature and low salinity and density, and belong to an H2O-NaCl±CO2 ±CH4 system. The δ18Owater values calculated for ore-bearing quartz vary from -17.9‰ to -10.8‰, and the δDV-SMOW values from bulk extraction of fluid inclusion waters vary from -166‰ to -127‰, suggesting that the ore-forming fluids consist dominantly of meteoric water. The δ34SV-CDT values range from 1.4‰ to 4.1‰. The 206Pb/204Pb, 207Pb/204Pb, and 208Pb/204Pb values of the ore minerals are in the ranges of 18.302-19.037, 15.473-15.593, and 38.110-38.945, respectively. The data for the S and Pb isotopic systems indicate that the ore-forming metals and sulfur came from Mesozoic magma. The Chaganbulagen deposit is a low-sulfidation epithermal Pb-Zn-Ag deposit, and the temperature decrease is the dominant mechanism for the deposition of ore-forming materials. © 2016 Elsevier B.V. Source


Li T.G.,China University of Geosciences | Wu G.,Chinese Academy of Geological Sciences | Liu J.,Chinese Academy of Geological Sciences | Hu Y.Q.,Yunnan Chihong Resources Exploration and Development Ltd Liability Company | And 2 more authors.
Acta Petrologica Sinica | Year: 2014

The Jiawula Pb-Zn-Ag deposit, situated 150km southwest of Manzhouli City, Inner Mongolia, is located in the northwest of the Derbugan fault, which is located on the southeast edge of the Central Mongolia-Argun Khanka orogenic belt. Seven sphalerite samples and six pyrite samples was selected for the Rb-Sr isochron dating method to determine the mineralization age of the Jiawula Pb-Zn-Ag deposit. A Rb-Sr isochron defined by seven sphalerite samples yields an age of 143.0 ± 2. OMa (MSWD =3.2), with initial Sr isotopic composition ISr =0.71265: six pyrite samples yield a Rb-Sr isochron age of 142.0 ± 3. OMa (MSWD = 5.7), with initial Sr isotope composition ISr = 0.71267: the Rb-Sr isochron age from sphalerite and pyrite is 142.7 ± 1.3Ma (MSWD = 3.8), with initial Sr isotope composition ISr =0.71266. These dating results indicate that the Jiawula deposit formed approximately 143 Ma ago during the Early Cretaceous. The Rb contents range from 0.1034 × 10-6 to 7.367 × 10-6, the Sr contents range from 1.301 × 10-6 to 7.148 × 10-6, and the initial Sr isotope ratios (87Sr/86Sr)i range from 0.71238 to 0.71277, with an average of 0.71264. Both Rb and Sr geochemical characters imply that ore-forming minerals of the Jiawula deposit mainly originated from the earth's crust, but also mixed with small amount of mantle material. The origin of the Jiawula deposit may be related to Mesozoic post-collisional orogeny of the Mongolia-Okhotsk orogen. Source


Li T.,China University of Geosciences | Wu G.,Chinese Academy of Geological Sciences | Liu J.,Chinese Academy of Geological Sciences | Hu Y.,Yunnan Chihong Resources Exploration and Development Ltd Liability Company | And 3 more authors.
Journal of Asian Earth Sciences | Year: 2015

The large Jiawula Pb-Zn-Ag deposit is located in the Derbugan metallogenic belt of the northern Great Xing'an Range. The vein style orebodies of the deposit occur along NWW- to NNW-trending fault zones. The ore-forming process at the deposit can be divided into three stages: an early quartz-pyrite-pyrrhotite-chalcopyrite stage, a middle quartz-carbonate-pyrite-galena-sphalerite stage, and a late quartz-carbonate-pyrite stage. Sulfide Rb-Sr dating indicates that the Jiawula deposit formed at ca. 143-142Ma. Four types of fluid inclusions have been distinguished in quartz veins including liquid-rich, gas-rich, H2O-CO2, and daughter mineral-bearing inclusions. The fluid inclusions of the early stage are mainly liquid-rich, gas-rich, and H2O-CO2 types, with a small number containing daughter minerals. Cumulatively, the types have homogenization temperatures, densities, and salinities of 304-438°C, 0.35-1.37g/cm3, and 0.8-44.6wt.% NaCl eqv., respectively. Inclusions of the middle stage are mainly liquid-rich and gas-rich types, with a small amount of H2O-CO2 and daughter mineral-bearing types; their homogenization temperatures, densities, and salinities vary from 242°C to 297°C, 0.71 to 1.44g/cm3, and 0.4wt.% to 36.8wt.% NaCl eqv., respectively. The late stage only comprises liquid-rich inclusions with homogenization temperatures, densities, and salinities of 181-238°C, 0.81-0.90g/cm3, and 0.2-1.9wt.% NaCl eqv., respectively. The ore-forming fluids of the Jiawula deposit are generally characterized by moderate temperature and low salinity and density, and belong to an H2O-NaCl-CO2±CH4 system. The δ18Owater values calculated for ore-bearing quartz vary from -13.4‰ to -9.1‰, and the δDV-SMOW values from bulk extraction of fluid inclusion waters vary from -166‰ to -133‰, suggesting that the ore-forming fluids mainly consist of meteoric water with a small amount of magmatic water. The δ34SV-CDT values range from 1.2‰ to 8.4‰. The 206Pb/204Pb, 207Pb/204Pb, and 208Pb/204Pb values of the ore minerals are in the ranges of 18.319-18.377, 15.499-15.596, and 38.094-38.314, respectively. Initial 87Sr/86Sr ratios of sulfides range from 0.712381 to 0.712770. The data for the S, Pb, and Sr isotopic systems indicate that the ore-forming metals and sulfur came from Mesozoic magma. The Jiawula deposit is a low-sulfidation epithermal Pb-Zn-Ag deposit, and fluid boiling is the dominant mechanism for the deposition of ore-forming materials. © 2014 Elsevier Ltd. Source

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