Geological characteristics, ore-forming ages and geological significance of Donggou-Jinlongshan gold deposit, South Qinling belt

被引:0
作者
Liu Y. [1 ,2 ]
Li Z. [1 ,2 ]
Zhou S. [3 ]
Han Y. [1 ,2 ]
Li H. [1 ,2 ]
Li X. [1 ,2 ]
Zhou S. [3 ]
机构
[1] School of Earth Science and Resources, Chang'an University, Xi'an
[2] Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, Ministry of Land and Resources, Xi'an
[3] China University of Geosciences (Beijing), Beijing
关键词
Ar-Ar age; Dome structure; Donggou-Jinlongshan; Epithermal deposit; Gold deposit; The ore-forming fluid;
D O I
10.13745/j.esf.2016.04.007
中图分类号
学科分类号
摘要
Donggou-Jinlongshan gold deposit located in flysch folded-thrust belt brachyanticline in southern Qinling orogen is considered to be a typical Carlin-type gold deposit and its metallogenic epoch yet to be determined. The regional tectonic system analysis showed that the brachyanticline is a dome structure which was formed by the superposition of east-west closed dome and north-east broad top anticline; the mineralization was mainly controlled by the late north-east brittle structure and east-west heterolithic facies unconformity interface. The geochemistry result of regional exploration shows that the anomalies of Au, As, and Sb register better, and that the anomalies distribute along north-east in beaded presentation and register obviously with the dome structure and the annular structure of remote sensing interpretation. The 40Ar/39Ar plateau age of sericite is 142.34±0.83 Ma, and the isochron age is 141.6±2.8 Ma, which shows that the mineralization happened in the early stage of the Late Mesozoic. The formation of pyrite has the characteristics of three periods; the auriferous pyrite has a symbiotic relationship with arsenopyrite and stibnite. Combining with regional date that the mineralization has a relationship with deep buried rock, and the deposit type is a remote epithermal deposit which is related to the deep hydrothermal fluid after the magmatic stage; the mineralization occurred in the squeeze-extended transition period at 141-142 Ma in the early Late Mesozoic; it suggests that the decompression and warming environment at the squeeze-extended transition period is the most favorable metallogenic geodynamic background. © 2016, Editorial Office of Earth Science Frontiers. All right reserved.
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页码:81 / 93
页数:12
相关论文
共 3 条
[1]  
Zhang F., Ma J., Formation of the micro-disseminated strata-bound Gold deposits, with special reference to structural evolution, Miliang Area, Zhen'an County, Shaanxi Province, China, Chinese Journal of Geochemistry, 15, 4, pp. 314-323, (1996)
[2]  
Wong W.H., Crustal movement and igneous activities in eastern China since Mesozoic time, The Geological Survey of China, 1, pp. 9-36, (1927)
[3]  
Shao J.A., Zhai M.G., Li D.M., Identification of five stages of dike swarms in the Shanxi-Hebei-Inner Mongolia border area and its implication, Acta Geologica Sinica, 78, 1, pp. 320-330, (2004)