科研之友
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摘要
Since 1980’s, a series of Ni-Cu sulfide deposits have been discovered in the Huangshan-Jingerquan metallogenic belt in the North Tianshan at the southern Margin of the Central Asian Orogenic Blet, including four large deposits (Huangshan, Huangshandong, Huangshannan and Tulaergen), two medium-sized deposits (Xiangshan and Hulu) as well as a series of small deposits and mineralized complexes. These deposits contain Ni metal reserves of ~1.0 million tons. The discoveries make the Huangshan-Jingerquan the largest Ni-Cu metallogenic belt worldwide. Some new discoveries along this belt in the last few years indicated a great prospecting potential. There are a lot of significant achieves on studies of metallogeny of the deposits and geochronology and petrology of the hosting mafic-ultramafic complexes along the belt in the past decades. Particularly, based on the studies of basaltic magmatiam in the periods of subduction, collision and post-collision of the North Tianshan arc system, the timing duration and condition for the Ni-Cu sulfide mineralization along the Huangshan-Jingerquan belt have been better constrained. The differences in size, shape and occurrence of the intrusions and hosted ore bodies at the two sides of the Gandun fault have been rarely concerned about. Therefore, the processes of sulfide transportation and deposition along the metallogenetic belt have not been well addressed. We proposed that the early stage of post-collision is the best time for Ni-Cu mineralization. The Cu-Ni sulfide mineralization is the result of the coupling of several geological factors, such as subducted slab break-off, upwelling and intense partial melting of asthenosphere mantle, and regional dextral strike-slip in the early stage of post-collision. ? 2022 Editorial Department of Mineral Deposits.
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