长安金矿区碱性岩锆石U-Pb年代学、微量元素、Hf同位素特征及其地质意义

doi:10.13278/j.cnki.jjuese.20180276

Abstract

Abstract: The Chang'an gold deposit,is one of the large classic gold deposits in the south Ailaoshan metallogenic belt, where many vein-type alkaline rocks appeared. In this paper,we present new data of the zircon U-Pb geochronology,trace element,and Hf isotope of these alkaline rocks from the Chang'an gold deposit to constrain their age and origin;furthermore,to discuss the formation mechanism of the gold deposit.The LA-ICP-MS zircon U-Pb isotope data show that these alkaline rocks formed in the Late Eocene(37.0-35.0 Ma).According to the chemistry of trace element,Hf isotope,and zircon saturation temperature,they were mainly derived from igneous zone in the lower crust,but a small amount of sediment material was formed during 1 648.5-34.8 Ma in the upper crust. Further,these alkaline rocks are the results of the partial melting of lower crust which were heated by the under-plated hot basic-ultrabasic melt induced by the ductile shear activity of Ailaoshan. Combined with the previous data of the stable isotopes of ore-forming fluid,we suggest that the forming of alkaline rocks and gold mineralization are independent events which occurred under the same geological setting,and the ductile shear activity of Ailaoshan was triggered by the southeastward escape of Tibetan Plateau during the collision of Indian plate and Euro-Asia plate.

Key words: Chang'an gold deposit, alkaline rocks, zircon geochronology, trace element, Hf isotope

CLC Number:

P588.15

Long Tianxiang, He Xiaohu, Liu Fei, Li Zongyong, Wang Yuchao, Zhao Jun, Li Yunfei, Wang Changbing, Cao Yuan. Zircon U-Pb Geochronology, Trace Element, Hf Isotope of Alkaline Rocks from Chang'an Gold Deposit and Its Geological Implication[J].Journal of Jilin University(Earth Science Edition), 2019, 49(6): 1607-1627.

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Zircon U-Pb Geochronology, Trace Element, Hf Isotope of Alkaline Rocks from Chang'an Gold Deposit and Its Geological Implication

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