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- Title
中条-熊耳多期裂谷开合构造及其深部找矿.
- Authors
刁 谦; 真允庆; 牛树银; 孙爱群; 宋 涛; 孙 璐
- Abstract
Based on preliminary study of the “ southern ancient land block” in North China (Zhongtiaoshan-Wangwushan-Xiongershan and East Qinling Mountains), the stretching, extension and uplift and compression of the crust in this area occur throughout the tectonic evolution of the earth. This kind of open-close tectonic cycle shows the phenomenon of “big opening and big closing” and “small closing and small opening”. The migration of opening-closing tectonics cycle according to “three steps” is southward, and the geological age of multistage rifting and mineralization tends to change gradually from north to south. During the period of 2. 5 Ga to 1. 73 Ga, the area experienced the sedimentary formation of Jiangxian Group of eugeosyncline dominated by extension in the near EW direction, and evolved into the sedimentary formation of Zhongtiao Group of miogeosyncline dominated by subsidence in the NE direction. It is actually a record of two rift-type constructions, controlled by the Jiangxian Movement and the Zhongtiao Movement. In the meantime, the Danshan Group of molasse formation might have deposited successively due to collision orogeny. In the vast area of Songshan, Xiongershan and Xiaoshan in the southeast, the bimodal Xionger Group sedimentary formation dominated by intermediate-basic volcanic rocks erupted (overflowed). There are A-type granite intrusions in some areas, and it is also a passive continental rifting environment, undoubtedly inseparable from the Proterozoic mantle plume activity. Accordingly, it can be called the “previous life” of the Zhongtiao-Xionger multi-stage rift. In the eastern Qinling area( including the Xionger Group), the Mesozoic Yanshan Movement is dominant. Confirmed from seismic tomographic data, the deep low-velocity and high-conductivity layers are columnar bodies, as the “present life” of the Zhongtiao-Xionger multi-stage rift, obviously a typical example of composite mantle plume structure. In the Zhongtiaoshan-Wangwushan area, the mineralization is dominated by Proterozoic copper deposits (containing Au, Mo, and Co). In the Xiongershan-East Qinling area, there are also a small amount of Mesoproterozoic and Paleozoic gold deposits(containing Mo and Co), but mostly gold and molybdenum (containing W, Pb-Zn, Be) deposits in the Indosinian and Yanshanian periods, important metal ore clusters in China. There are many types of ore deposits in the area, basically related to the emplacement of transmagmatic oreforming hydrothermal fluids. According to statistics, large- and super-large deposits are controlled by crustal extensional fracture(opening) environment or open-close tectonic transformation area. In view of the specific exploration situation of Zhongtiao-Xionger multi-stage rifting, eight suggestions for key prospecting are put forward for reference.
- Publication
Journal of Guilin University of Technology, 2022, Vol 42, Issue 1, p29
- ISSN
1674-9057
- Publication type
Article
- DOI
10.3969/j.issn.1674-9057.2022.01.003