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Chen C.,Shijiazhuang University of Economics | Wang B.,Shijiazhuang University of Economics | Niu S.,Shijiazhuang University of Economics | Zhang F.,Shijiazhuang University of Economics | And 7 more authors.
Jilin Daxue Xuebao (Diqiu Kexue Ban)/Journal of Jilin University (Earth Science Edition) | Year: 2015

The Mujicun copper (molybdenum) polymetallic orefield in the Taihang Mountains, is located in the secondary faulted basin developed in the upper block of detachment zone on the west side of the neck of the dumbbell shaped Laiyuan igneous complex, the northeastern pitching end of the Fuping mantle branch structure. It is composed of porphyry copper (molybdenum) deposit, skarn iron-copper deposit and hydrothermal vein lead-zinc-silver deposit in periphery, and become the most perspective large-scale copper (molybdenum) polymetallic orefield in Hebei Province at present. Considering the study of ore-forming material sources is crucial for further understanding the metallogenesis of the deposit and the direction of ore-prospecting, authors tested and analyzed sulfur, lead, carbon, hydrogen, oxygen, silicon, and rhenium isotopic compositions in such minerals from the ore as chalcopyrite, galena, pyrite, molybdenite, magnetite, quartz and gypsum. The data showed that the major value of δ34S changes from -3.5‰ to 3.2‰, with the average of 0.3‰; 206Pb/204Pb from 15.566 0 to 17.072 0, with the average of 16.547 0; 207Pb/204Pb from 15.031 0 to 15.523 0, with the average of 15.258 0; 208Pb/204Pb from 36.292 0 to 37.375 0, with the average of 36.721 0; δ13C from -2.94‰ to -2.18‰, with the average of -2.62‰; δ30Si from -0.3 ‰ to 0.2 ‰, with the average of 0.0‰; w(Re) from 23.65 μg/g to 266.50 μg/g, with the average of 142.33 μg/g; δ18OH2O from -10.64‰ to 7.70‰, with the average of -1.47%, δD from -148.4‰ to -89.0‰, with the average of -113.7‰ which is less than that of the standard magmatic water. These isotopic data mentioned above show that the ore-forming materials were mainly derived from the deep source and the ore-forming solutions are mainly composed of magmatic water and partly of atmospheric water. ©, 2015, Jilin University Press. All right reserved. Source

Chen C.,Shijiazhuang University of Economics | Chen C.,Baoding Institute of Geological Engineering and Exploration of Hebei Province | Wang B.-D.,Shijiazhuang University of Economics | Niu S.-Y.,Shijiazhuang University of Economics | And 7 more authors.
Geology in China | Year: 2013

Located in Mujicun Village of Laiyuan County, Hebei Province, the Mujicun copper ( molybdenum ) deposit has been proved to be a large-size copper (molybdenum) gold and silver polymetallic deposit in northern Taihang Mountains, geotectonically lying in the secondary faulted basin in the upper block of the detachment zone on the western side of Laiyuan dumbbell -shaped complex rock body, along the northern section of Fuping mantle branch structure. In order to study the metallogenic ages of the Mujicun copper ( molybdenum) deposit, the authors mainly analyzed the Re-Os isotopes of 5 pieces of molybdenite samples from different drill holes at different depths on the basis of the metallogenic geological background, and obtained three important metallogenic ages, i.e., (143.2±2.2) Ma∼(144.9±2.3) Ma (model age), (144±1) Ma (weighted mean model age) and (143.8+1.2) Ma (isochron age). The dating result suggests that the ore deposit was formed in the Late Jurassic of Yanshanian period, which is consistent with polymetallic metallogenic event in northern Taihang Mountains. In addition, according to the characteristics of fluid inclusions and the content of Re in molybdenite, this paper also indicates that the inclusions are composed of 4 types, i.e., gas-liquid inclusions, rich gas inclusions, CO2-bearing inclusions and gas- liquid- solid multiphase inclusions, in which H2O is the main composition for gas-liquid inclusions and rich gas inclusions. The ore-forming process took place under the condition of medium temperature and middle-low salinity, and the ore-forming materials were mainly derived from the depth of the earth. Source

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