Determination of the age for the Xingshu valley gold mineralization spots in the eastern segment of Kunlun orogenic belt and the geochemical characteristics of its surrounding rocks
Shi Chao1, Li Rongshe1, He Shiping1, Yu Pusheng1, Wang Chao1, Pan Shujuan2, Zhang Haidi1
1. Xi'an Institute of Geology and Mineral Resources, China Geological Survey; Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, MLR, Xi'an 710054;
2. Aerophotogrammetry and Remote Sensing Bureau of China Coal Geology, Xi'an 710054
Eastern Kunlun metallogenic belt is the precious metal-nonferrous metal ore-forming belt that has great prospecting potential in western China.Some gold mineralization spots were studied on chronology and the surrounding rock geochemical character in Early Carboniferous Halaguoge Formation during the investigation in Nuomuhong Township Dulan County,eastern segment of Kunlun orogenic belt.The 206Pb/238U weighted average age of 243.4±1.9 Ma,which was obtained by in-situ LA-ICP-MS zircon dating of the quartz albite porphyry,proves that this gold deposit was formed in Early Triassic.The results of geochemical analysis show that the surrounding rock of Xingshu valley gold mineralization spots(Andesitic basalt)is characterized by high Al2O3、Na2O and low TiO2,K2O.In diagram for Zr/TiO2-Nb/Y and TFeO/Mg-SiO2,all samples fall into andesitic basalt area and the tholeiitic area,respectively,this indicates that it belongs to the tholeiitic basalt.The volcanic rocks were formed in a continental rift environment judging by rich LREE,LILE and some of HFSE; depleted Nb,Ta,Nd,Zr and Hf; the allocation model for clear separation of LREE/HREE and the comprehensive analysis of discrimination diagrams.
. Determination of the age for the Xingshu valley gold mineralization spots in the eastern segment of Kunlun orogenic belt and the geochemical characteristics of its surrounding rocks[J]. Chinese Journal of Geology, 2013, 48(4): 984-996.