| Citation: |
LI Lailong, ZHANG Yongmei, GU Xuexiang, LIU Chenyu, ZHANG Yingshuai. 2024. Pb-Zn Mineralization in Kuergasheng Pb-Zn Deposit, Xinjiang: Constraints from In-situ Micro Composition of Quartz and Sphalerite. Northwestern Geology, 57(3): 139-153. doi: 10.12401/j.nwg.2023174
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Pb-Zn Mineralization in Kuergasheng Pb-Zn Deposit, Xinjiang: Constraints from In-situ Micro Composition of Quartz and Sphalerite
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Abstract
The Kuergasheng Pb-Zn deposit, located in the Serimu area of the western Tianshan of Xinjiang, is a hydrothermal vein-type Pb-Zn deposit formed in the extensional environment of the plate. The ore body is veined, reticulated and lenticular in the upper subgroup of the Upper Devonian Toskurtau Formation, and is controlled by three north-west fault zones that are spread in parallel with each other. The mineralization process can be divided into three stages: the pre-ore quartz stage (I), the quartz-polymetallic sulphides stage (II) (main mineralization stage) and the calcite stage (III). In this study, the LA-ICP-MS method was used to analyze quartz and sphalerite at different stages of mineralization. The results showed that: (1) The Quartz in the I and II stages of the Kuergasheng Pb-Zn ore area contained more trace elements. Among them, Al, K, Na and Li are mainly enriched. The mass fractions of Al, K, Na and Li varied from 547.56×10−6～4355.49×10−6, 9.41×10−6～626.66×10−6, 23.78×10−6～994.40×10−6, and 43.37×10−6～265.52×10−6, respectively, showing a significant linear positive correlation between Al and Li+Na+K. The contents of Ti and Ge were low, and the contents of Ti and Ge varied from 3.17×10−6～14.05×10−6, and 1.77×10−6～6.50×10−6, respectively, reflecting the low mineralization temperature. Compared with the world's typical porphyry-type and epithermal Pb-Zn deposits, the quartz trace elements characteristics of the Kuergasheng Pb-Zn deposit are more similar to the epithermal Pb-Zn deposits. (2) The content and ratio of trace elements such as Mn, In, Fe, Ga, Ge in sphalerite indicate that the deposit was formed in a medium to low temperature environment, and the mineralization temperature was further limited to be 122～178 ℃ by using sphalerite GGIMFis thermometer. The Ga/In ratio and lnw(Ga)-lnw(In) characteristics indicate that the formation of sphalerite is related to sedimentation. Combining the trace element characteristics of host rock with the previous Pb isotopic data, it is speculated that the ore-forming materials of the Kuergasheng Pb-Zn deposit were mainly derived from the host rock.
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References
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LI Lailong, ZHANG Yongmei, GU Xuexiang, LIU Chenyu, ZHANG Yingshuai. 2024. Pb-Zn Mineralization in Kuergasheng Pb-Zn Deposit, Xinjiang: Constraints from In-situ Micro Composition of Quartz and Sphalerite. Northwestern Geology, 57(3): 139-153. doi: 10.12401/j.nwg.2023174
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Figure .
新疆西天山赛里木地区大地构造位置图（a）和区域地质图（b）（据新疆维吾尔自治区
地质矿产勘查开发局，2005；顾雪祥等，2013，2014修改） - Figure .
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Figure .
库尔尕生矿床Ⅰ-2号矿体7号勘探线剖面图（据新疆有色地质矿产勘查院，2002修改）
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Figure .
库尔尕生铅锌矿床矿石构造、脉体穿插关系与矿物组合
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Figure .
浅成低温热液型、斑岩型铅锌矿床和库尔尕生铅锌矿床石英Li、Al、Ti和Ge元素对比
（斑岩型和浅成低温热液型铅锌矿床石英微量数据源自Gao et al.，2022） -
Figure .
浅成低温热液型、斑岩型铅锌矿床和库尔尕生铅锌矿床石英Li、Al、Ti和Ge元素对比（底图据Gao et al.，2022）
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Figure .
库尔尕生铅锌矿床石英中Al与
（Li+Na+K）的相关关系 -
Figure .
库尔尕生铅锌矿床闪锌矿ln（Ga）-ln（In）
关系图（底图据张乾，1987）