Dizhi lixue xuebao (Feb 2022)
Metallogenic regularity of Meso-Cenozoic stratabound glutenite-type Cu-Pb-Zn deposits in the southwestern Tianshan Mountains
Abstract
The southwestern Tianshan Mountains is an important producing area of the Meso-Cenozoic stratabound glutenite-type Cu-Pb-Zn deposits in Xinjiang. Sareke copper mine, Wulagen lead-zinc mine, Huayuan copper mine and Jiashi copper mine are the representative deposits, which all occur in the red bed basin on the edge of the uplift denudation area and are strictly controlled by strata. The lower part of the ore-bearing basin is composed of coal-bearing hydrocarbon-generating rocks, the middle part is well-permeable glutenites as the Cu-Pb-Zn reservoir, and the overlying layer is a sealed cap formed by gypsum rocks and mudstones, showing the ore-forming characteristics of co-enrichment of Cu-Pb-Zn-Uranium-coal-natural gas in the same basin. In this paper, we summarized the sedimentary-tectonic evolution of these ore-bearing basins and the characteristics of ore-bearing layers, and analyzed the ore-controlling conditions and metallogenic characteristics of typical copper, lead and zinc deposits. Combining with comparative analysis, we summarized the regional metallogenic regularity of the Meso-Cenozoic glutenite-type Cu-Pb-Zn deposit, and hold the view that organic matter is closely related to Cu-Pb-Zn mineralization. Moreover, it is inferred that Cu-Pb-Zn-lean ore bodies were formed over the original source layer in the uplift caused by the superimposition of oilfield brine; Cu-Pb-Zn-rich ore bodies were formed by the superimposition of deep-source ore-forming fluids from the Himalayan fault structure. The metallogenic model of the middle Cenozoic stratabound glutenite-type Cu-Pb-Zn deposits in the southwestern Tianshan Mountains provides a basis for the exploration of the known mines in their deep and edge, and also provides guidance for the regional prospecting work.
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