Time filter

Source Type

Zhang Z.,China University of Geosciences | Zhang Z.,Development and Research Center Geological Survey | Zhang Z.,Mineral Exploration and Technical Guidance Center | Zhang D.,China University of Geosciences | And 5 more authors.
Jilin Daxue Xuebao (Diqiu Kexue Ban)/Journal of Jilin University (Earth Science Edition) | Year: 2013

The forming age of the Meizikeng molybdenum deposits located in Jiuling-Zhanggongshan ploymetallic metallogenic belt, northern Jiangxi Province, has been determined by the Re-Os isotopic dating method in this paper. The Re-Os dating of 5 molybdenite samples yielded average model ages from 148.2 to 150.7 Ma, with a weighted average of (150±1) Ma, and an isochron age of (148.9±4.4) Ma. Evidently, we can constrain the forming age of Meizikeng deposits at ca.150 Ma. The geological characteristics of the deposit show that the molybdenum mineralization in this deposit is closely related to the Late Jurassic magmatic activities, which accounted for the constant pressure triggered by the simultaneous subduction of the Pacific plate. The forming ages of some deposits in the metallogenic belt allows further inference about the existence of different mineralization processes. The molybdenum polymetallic mineralization was caused by the extension and reduction of the lithosphere (135 Ma±). Moreover, the Late Jurassic mineralization was also found in this metallogenic belt, which was formed by the convergence of lithosphere plate in East Asia since the Late Middle Jurassic period (150 Ma±). The accurate ore-forming age will contribute to mineral exploration in Jiuling-Zhanggongshan polymetallic metallogenic belt, northern Jiangxi Province.

Zhang Z.,Research and Development Center | Zhang Z.,Mineral Exploration and Technical Guidance Center | Zhang Z.,China University of Geosciences | Zhang D.,China University of Geosciences | And 6 more authors.
Jilin Daxue Xuebao (Diqiu Kexue Ban)/Journal of Jilin University (Earth Science Edition) | Year: 2015

Jiaochong Au-S deposit is located in Tongling ore concentration area which is in the middle and lower reach of Yangtze River. The ore bodies are mainly existed in the limestone of Qixia Group in Early Permian. According to the research of the field geological characteristics and ore composition, Jiaochong ore was fromed in the three phases: early quartz stage, middle quartz-sulfide stage, and late calcite stage. Through the detailed petrographic observation and microscopic measurement to the quartz and calcite of different ore-forming stages, the fluid homogenization temperatures fall into the three scopes: 410-440 ℃, 320-350 ℃, and 260-320 ℃ correspondingly, showing a downward trend from the early quartz stage to the late calcite stage. According to the formula calculation, the metallogenic depth is about 1.5 km; and the mineralization pressure is 400×105 Pa. Fluid boiling action was the main mechanism of metal sulfides precipitation. Trapping pressures of fluid inclusion are used to estimate the ore-forming pressure and depths, so as to provide a theoretical basis for deep prospecting prediction. © 2015, Jilin University Press. All right reserved.

Zhang Z.-H.,China University of Geosciences | Zhang Z.-H.,Research and Development Center | Zhang Z.-H.,Mineral Exploration and Technical Guidance Center | Zhang D.,China University of Geosciences | And 10 more authors.
Geological Bulletin of China | Year: 2013

The Jiaochong Au-S ore deposit is located in the Tongling ore concentration area along the middle-lower reaches of the Yangtze River. The ore body mainly occurs in the Lower Permian Qixia Formation. Based on an analysis of geological and ore-forming conditions, this paper systematically focuses on the composition characteristics of S, Pb isotopes in the sulfide ore minerals, and also discusses the sources of the ore-forming materials. Studies have shown that the composition of S isotope in sulfide ore minerals has a narrow variation range, and the δ34S∑S in the ore-forming hydrothermal system is about 4.0‰. It is inferred that the S was genetically closely related to the magmatic sulfur. The isotopic compositions of ore lead vary gready and belong to anomalous lead. Finally, through the chart of Zartman's Pb evolutionary tectionic settings and Δγ-Δβ diagram of genetic classification, the authors consider that the ore-forming materials of the ore deposit were closely related to the magmatism and derived from the mixed sources of the upper continental crust and the mantle. The authors sincerely hope that these data can provide some help for the study of ore deposits related to granodiorite of the Tongling ore concenteation area.

Discover hidden collaborations