The orogenic Au mineralization system and regional tectonic evolution in the Kalamaili area, East Junggar, Xinjiang

被引：0
|
作者：
Gu X. [1 ,2 ]
Zhang Y. [1 ,2 ]
Ge Z. [3 ]
Chen W. [4 ]
Xu J. [1 ]
Huang G. [5 ]
Tao W. [5 ]
机构：
[1] School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing
[2] State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences (Beijing), Beijing
[3] No.5 Gold Geological Party of Chinese People's Armed Police Force, Xi'an
[4] No.10 Gold Geological Party of Chinese People's Armed Police Force, Kunming
[5] Regional Institute of Shaanxi Bureau of Geological Exploration, Xianyang
来源：
| 1600年 / Science Frontiers editorial department卷 / 27期
关键词：
Eastern Junggar; Kalamaili; Mineralization system; Orogenic gold deposits; Regional tectonic evolution; Xinjiang;
D O I：
10.13745/j.esf.sf.2020.3.21
中图分类号：
学科分类号：
摘要：
Au deposits, including the Jinshuiquan, Shuangquan, Nanmingshui, and East Sujiquan Au deposits in the Kalamaili area of eastern Junggar, Xinjiang, constitute a mineralization system related to the late Paleozoic collisional orogeny. The deposits are sandwiched between the regional Kalamaili and Qingshui-Sujiquan faults. Au mineralization is controlled by the subsidiary brittle-ductile faults in slightly metamorphosed, late Paleozoic volcanic sedimentary rocks, and typically occurs as medium-to-steep dipping auriferous quartz veins and surrounding altered rocks. Fluid inclusions, H-O-S-Pb isotopes, and hydrothermal zircon U-Pb dating indicate that the ore-forming fluids are characterized by medium-to-high temperature (mostly 240-330 ℃), low salinity (<6 wt% NaCleq), and CO2-rich metamorphic water. The ore-forming material was sourced from host volcanic sedimentary rocks. Fluid immiscibility (phase separation) and fluid-rock interaction (wall-rock sulfidation) are the principal mechanisms of Au deposition. The timing of mineralization was approximately 314 Ma, and mineralization depths ranged from 7 to 15 km. From the Late Carboniferous to Early Permian, the transition of the tectonic system from compression to strike-slip or strike-slip extension in the study area resulted in the migration of deep metamorphic auriferous CO2-H2O-NaCl±CH4 fluids to shallower depths along NW- to EW-trending strike-slip faults. Au precipitation in the subsidiary faults of the brittle-ductile transition zone or brittle deformation zone led to the formation of auriferous quartz veins and related altered rock ores. © 2020, Editorial Office of Earth Science Frontiers. All right reserved.
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页码：254 / 275
页数：21
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