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Liu Q.-Q.,Central South University | Liu Q.-Q.,Henan Institute of Geological Exploration for Non ferrous Metal | Zhang Y.,Central South University
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2015

Yaochong Mo deposit locates at the Qinling-Dabie metallogenic belt, the deposit is hosted by Dabie metamorphic complex at the exocontact zone. The results show that, the values of Ce4+/Ce3+, Ce/Ce* and Eu/Eu* of zircons in monzogranite from Yaochong Mo deposit are from 188 to 676, 29.88 to 254.37, 0.38 to 0.66, and the average values are 384, 113.94 and 0.58, respectively, which suggests that magma has the characteristics of high oxygen fugacity. Ti content temperature of zircons is from 623.6℃ to 762.3℃, which is temperature characteristics of middle-acidic magma. The ore-forming rock is from the granitic magma with high oxygen fugacity derived from the patial melting of ancient crust triggered by asthenosphere upwelling, and the granitic magma with high oxygen fugacity is contaminated by the earth's crust material during the process of emplacement, and then the magma produces magmatic hydrothermal fluid with rich Mo, which causes that diagenetic and mineralization came out in the proper geological conditions with the fluid migration. ©, 2015, Central South University of Technology. All right reserved. Source


Liu Q.-Q.,Central South University | Liu Q.-Q.,Henan Institute of Geological Exploration for Non ferrous Metal | Shao Y.-J.,Central South University | Zhang Y.,Central South University
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2015

Yaochong Mo deposit is located at Qinling-Dabie metallogenic belt, the deposit is produced in Dabie metamorphic complex at the exocontact zone. Yaochong concealed stock consists of the monzogranite and granite porphyry, which yield LA-ICP-MS zircon U-Pb ages (139.6±2.0) Ma and (139.8±2.2) Ma, respectively, indicating that Yaochong granite was formed at the Late Jurassic-Early Cretaceous magmatism. According to zircon Hf isotope analyses, the εHf(t) values of the granite range from -30 to -22.8, which is located below the depleted mantle line. The tDM2 values range from 2.21 Ga to 2.60 Ga, which indicates the granite was formed from the lower crust of Yangtze Block. The component of the granite porphyry is similar to Neoproterozoic TTG magmatic rocks. The mineralization of Yaochong Mo deposit was formed in the Late Jurassic-Early Cretaceous period of the transformation of tectonic regime. The granitic magma was derived from the patial melting of ancient crust triggered by asthenosphere upwelling, which probably provides diagenesis and ore-forming material of Yaochong Mo deposit. ©, 2015, Central South University of Technology. All right reserved. Source


Luo Z.-Z.,Henan Institute of Geological Exploration for Non ferrous Metal | Li Y.-F.,Henan Institute of Geological Exploration for Non ferrous Metal | Wang Y.-T.,Chinese Academy of Geological Sciences | Wang X.-G.,Henan Institute of Geological Exploration for Non ferrous Metal
Geological Bulletin of China | Year: 2010

The Dayinjian molybdenum deposit, located in north margin of the Dabie Mountain, is a porphyry-skarn-vein type deposit. In this paper, four molybdenite samples selected from this deposit have been used for Re-Os dating by the inductively coupled plasma mass spectrometry (ICP-MS), and the dating yielded of a Re-Os isochron age of 122.4 ± 7.2 Ma, indicating the molybdenum mineralization occurred in Early Cretaceous. Moreover, the Re isotopic contents of molybdenite samples indicate that the ore-forming materials are likely to be mainly derived from the lower crust. The Dayinjian molybdenum deposit is developed in the regional exten-sional regime while the lithosphere thinning occurred in Mesozoic in the central-eastern China, which is a component part of the large-scale metal mineralization in the eastern China. Source


Liu Q.-Q.,Henan Institute of Geological Exploration for Non ferrous Metal | Huang Z.-L.,Bureau of Mineral Resources | Li G.-P.,Henan Institute of Geological Exploration for Non ferrous Metal
Geology in China | Year: 2015

The Jingshansi iron deposit in Henan Province is located in the southeastern part of the North China Craton. The orebodies occur in nearly bedded and lenticular forms, and the iron ores are predominantly banded, with minor massive ones. Taihua Group Tieshanmiao Formation marbles are developed as main wall rocks and interlayers among the orebodies. Geochemical studies of carbon, oxygen and silicon isotopes of the ore deposit were carried out to investigate the ore-forming fluid nature and its potential sources. The results show that δ13C v-pdb values of ore-forming calcite range from -5.2‰ to -l.4‰, δ18Ov-smow values range from 8.5‰ to l6.9‰, δ13Cv-pdb values of carbonate host rocks calcite range from -l.0‰ to l.6‰ and δ18Ov-smow values range from 2O.3‰ to 23.4‰, the C and O isotope evolution indicates that drastic water-rock interaction took place at the ore-forming stage, and isotope exchange took place between ore-forming fluids and carbonate host rocks. The carbon isotope components were mainly provided by the marine carbonate rocks through dissolution, influenced by middle-low temperature alteration. The characteristics of δ18OH2O indicate that the hydrothermal solution is the mixture of magmatic water and seawater. The δ30Si nbs-28 values of iron ore quartz range from -l.9‰ to -0.4‰, and the δ30Si value of leptite quartz is 0‰, which indicates that the silicon isotope were derived from volcanic exhalation. The Si isotope fractionation took place in the ore-forming process. A comprehensive analysis shows that the Jingshansi iron deposit was formed in a submarine volcanic eruptions-sedimentary environment in Precambrian. Source

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