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Zhu Z.-Y.,Nanjing University | Jiang S.-Y.,Hubei University | Hu J.,East China Mineral Exploration and Development Bureau for Non Ferrous | Gu L.-X.,East China Mineral Exploration and Development Bureau for Non Ferrous | Li J.,Hubei University
Journal of Asian Earth Sciences | Year: 2014

Porphyry and skarn Cu-Fe-Au-Mo deposits are widespread in the Middle and Lower Yangtze River metallogenic belt (MLYMB), eastern China. The Matou deposit has long been regarded as a typical Cu-Mo porphyry deposit within Lower Yangtze part of the belt. Recently, we identified scheelite and wolframite in quartz veins in the Matou deposit, which is uncommon in other porphyry and skarn deposits in the MLYMB. We carried out detailed zircon U-Pb dating and geochemical and Sr-Nd-Hf isotopic studies of the granodiorite porphyry at Matou to define any differences from other ore-related granitoids. The porphyry shows a SiO2 content ranging from 61.85wt.% to 65.74wt.%, K2O from 1.99wt.% to 3.74wt.%, and MgO from 1.74wt.% to 2.19wt.% (Mg# value ranging from 45 to 55). It is enriched in light rare earth elements and large ion lithophile elements, but relatively depleted in Nb, Ta, Y, Yb and compatible trace elements (such as Cr, Ni, and V), with slight negative Eu anomalies (Eu/Eu*=0.88-0.98) and almost no negative Sr anomalies. Results of electron microprobe analysis of rock-forming silicate minerals indicate that the Matou porphyry has been altered by an oxidized fluid that is rich in Mg, Cl, and K. The samples show relatively low εNd(t) values from -7.4 to -7.1, slightly high initial 87Sr/86Sr values from 0.708223 to 0.709088, and low εHf(t) values of zircon from -9.0 to -6.5, when compared with the other Cu-Mo porphyry deposits in the MLYMB. Zircon U-Pb dating suggests the Matou granodiorite porphyry was emplaced at 139.5±1.5Ma (MSWD=1.8, n=15), which is within the age range of the other porphyries in the MLYMB. Although geochemical characteristics of the Matou and other porphyries in the MLYMB are similar and all adakitic, the detrital zircons in the samples from Matou suggest that Archean lower crust (2543±29Ma, MSWD=0.25, n=5) was involved with the generation of Matou magma, which is different from the other porphyries in the belt. Our study suggests that the Matou granodiorite porphyry originated from partial melting of thickened lower crust that was delaminated into the mantle, similar to the other porphyries in the MLYMB, but it has a higher proportion of lower crustal material, including Archean rocks, which contributed to the formation of the porphyry and related W-rich magmatic-hydrothermal system. © 2013 Elsevier Ltd.


Xie X.-N.,Central South University | Ma C.,East China Mineral Exploration and Development Bureau for Non Ferrous | Liu J.-X.,Central South University | Hu J.,East China Mineral Exploration and Development Bureau for Non Ferrous | And 2 more authors.
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2013

Matou compound granites occurr in the Chizhou segment of Jiangnan transitional zone, consist mainly of granodiorite-porphyry and moyite, and are closely related to the Cu-Mo polymetallic mineralization in this area. The granodiorite-porphyry has high LILEs (especially Sr and Ba) and LREEs, and low HREEs and Y contents and insignificant negative Eu anomalies, similar to the adakitic rocks. It is identified that the product is derived from the partial melting of enriched lithospheric mantle, and also contaminates some crustal components in its diagenetic processes. The moyite is characterized by high silica and high potassium, and its zircon saturation temperature is close to that of eutectic granite. It may be the product of the partial melting of the pre-exist granites during the depressurizing. In Matou Cu-Mo polymetallic orefield, the materials source of the sulfur ore-forming elements, such as Cu, Au and Mo, is probably related to that of the emplaced granodiorite-porphyry, and the moyite plays a catalytic role in the molybdenum concentration and intensive mineralization.


Li J.,Central South University | Zhu Z.,Central South University | Lu G.,Central South University | Zeng S.,Central South University | Yan W.,East China Mineral Exploration and Development Bureau for Non ferrous
2010 International Conference on Multimedia Technology, ICMT 2010 | Year: 2010

We applied simulated annealing in CSAMT 1 dimension inversion. We demonstrate the simulated annealing flexibility for starting models by allowing the model parameters to vary in a large range. The inversion started from 10 different starting models and has 1000 temperature reductions. Numerical calculation model was a three-layer geoelectric model; the observed data were electric field component. The results show all runs converge to the true parameters. The efficiency of simulated annealing for CSAMT 1D inversion is high. ©2010 IEEE.


Zhao C.,Central South University | Xie X.-N.,East China Mineral Exploration and Development Bureau for Non Ferrous | Ma C.,East China Mineral Exploration and Development Bureau for Non Ferrous | Liu J.-X.,Central South University | Cao C.-H.,Central South University
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2015

Matou Cu-Mo polymetallic deposit is one of the typical porphyry Cu-Mo deposits in Chizhou segment of Jiangnan transitional zone, Anhui province. The high precision LA-ICP-MS zircon U-Pb dating is used for granodiorite (porphyry) of mine drill in this area. Zircon LA-ICP-MS U-Pb dating of four drilling samples, yielded ages of 144.5-145.8 Ma for the granodiorite-porphyry, and of 141.5 Ma for the moyite, indicating that they are all the products of the Late-Yanshanian (late-Jurassic to early Cretaceous) magmatism. Meanwhile, Re-Os isotopic age analysis of thirteen molybdenite yielded a weighted average model age of (148±3) Ma. Considered the relationship between the distribution and forming of the ore closely related with the rock alteration, the above information suggests that the diagenesis and the metallogenesis of the Matou Cu-Mo polymetallic deposit are the products of the same tectonic-magamtic thermal events. © 2015, Central South University of Technology. All right reserved.

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