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2018 Vol. 24, No. 2
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Bailin CHEN, Faxian DONG, Songbin LI, Zhengle CHEN, Fengbin HAN. A PRELIMINARY STUDY ON THE ORE-CONTROLLING STRUCTURE IN TIANYU NICKEL DEPOSIT, EASTERN TIANSHAN MOUNTAINS, NW CHINA[J]. Journal of Geomechanics, 2018, 24(2): 177-187. doi: 10.12090/j.issn.1006-6616.2018.24.02.019
Citation: Bailin CHEN, Faxian DONG, Songbin LI, Zhengle CHEN, Fengbin HAN. A PRELIMINARY STUDY ON THE ORE-CONTROLLING STRUCTURE IN TIANYU NICKEL DEPOSIT, EASTERN TIANSHAN MOUNTAINS, NW CHINA[J]. Journal of Geomechanics, 2018, 24(2): 177-187. doi: 10.12090/j.issn.1006-6616.2018.24.02.019
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A PRELIMINARY STUDY ON THE ORE-CONTROLLING STRUCTURE IN TIANYU NICKEL DEPOSIT, EASTERN TIANSHAN MOUNTAINS, NW CHINA

  • Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China

Received Date:  10 July 2017
Revised Date:  09 March 2018
    Abstract
  • Tianyu nickel deposit is located in southeastern margin of east Tianshan block of the Trim Plate. It is closely related between the ore resource and the tectonics in east Tianshan area, while the Cu-Ni deposits are mainly controlled by regional deep-major fault zone (Kangguer fault and Yamansu Fault et al). The mainly outcropped lithology are medium-hypo metamorphic rocks of middle Proterozoic group and secoundarily are volcanic rocks and pyroclastic rocks of upper Paleozoic group in Tianyu deposit and its vicinity. Folds and faults are well developed with NEE-trending extension in the area, in which, Baihuguan composite anticline is a first-order fold and Shaquanzi fault (as a part of the Yanmansu fault) is a first-order fault. Gneissoid and augen structures of metamorphic rocks or deformed granites are also well developed, which indicates that ductile deformation had occurred. Detailed surface geology and tunnel survey reveal that, there mainly are NE-trending and SN(NNE)-trending faults in ore area. Some of the NE-trending faults control on the Ni ore body by means of controlling the emplacement and distribution of the Ni-bearing ultra-basic rocks. The SN(NNE)-trending faults developed and became active after the forming of the Ni ore body, and often offset ultra-basic rock and Ni ore body with sinistral sense of displacement. Nevertheless, there isn't an obvious sinistral sense of Ni ore body by SN(NNE)-trending faults in Tianyu ore area, and the main Ni ore body is complete and entire. The lens out of Ni ore body at northeast of CM12 on 1350m level was not caused by F8 fault, but resulting from a nature pinching out because of inhomogeneous nickel mineralization in ore-bearing ultra-basic rocks. The results of this study have important implications for the analysis of ore-controlling structure in eastern Tianshan mountains and all domestic copper-nickel deposits as well as the deployment of mining projects.
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