H-O-S-Pb Isotopic Compositions of the Chagele Pb-Zn-Cu-Mo Deposit, Tibet: Implications for the Ore-forming Processes and Comparison with Pb-Zn (Cu-Mo) Deposits in Middle-east Segment of the Nyainqentanglha Metallogenic Belt

被引：0
|
作者：
Zhang Y. [1 ]
Zheng Y. [1 ,2 ]
Gao S. [1 ]
Jiang J. [3 ]
Tian K. [3 ]
Wu D. [4 ]
Jiang X. [3 ]
Zhang S. [5 ]
Luan K. [1 ]
机构：
[1] Institute of Geological Survey, China University of Geosciences (Wuhan), Wuhan, 430074, Hubei
[2] State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences (Beijing), Beijing
[3] Faculty of Earth Resources, China University of Geosciences (Wuhan), Wuhan, 430074, Hubei
[4] Guizhou Water Technology Co., Ltd, Guiyang, 550000, Guizhou
[5] School of the Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing
来源：
Geotectonica et Metallogenia | 2018年 / 42卷 / 03期
关键词：
Chagele Pb-Zn-Mo-Cu deposit; Gangdese metallogenic belt; H-O-S-Pb isotopes; Ore-forming material;
D O I：
10.16539/j.ddgzyckx.2018.03.005
中图分类号：
学科分类号：
摘要：
The Chagele is a typical Pb-Zn-Cu-Mo deposit located in the western Nyainqentanglha Pb-Zn-Ag-Fe-Cu metallogenic belt (NPMB) that immediately north of the Gangdese porphyry copper belt, Tibet. The deposit contains three ore types: the porphyry (Cu) Mo ores occur as thin veins hosted in the granite porphyry; the skarn (Cu) Pb-Zn type ores are of vein-type or lenticular-type mainly occurring in the external contact zone and interstratified crack zone; and the hydrothermal vein Pb-Zn type ores are controlled by the NNE-striking faults and situated in the structural fractured zones and the up walls of fault zones. The (Cu) Pb-Zn ores consist mainly of galena, sphalerite, chalcopyrite, pyrite, malachite, showing automorphic granular, hypautomorphic to allotriomorphic granular and metasomatic-relict textures, and exhibiting mainly veined, banded, disseminated and massive structures. Hydrothermal alteration includes skarnization, silicification and limonitization. The (Cu) Mo ores consists mainly of chalcopyrite and molybdenite, and minor pyrite. The (Cu) Mo ores are characterized by scaly texture, veinlet and massive structures. It has reserves of 0.38 Mt Pb, 0.6 Mt Zn and 110.1 t Ag, with average grade of 2.08%, 3.29% and 6.07 g/t, respectively, and is considered as a deposit with huge ore-prospecting potential in western of NPMB. However, the ore-forming material and genesis of the Chagele deposit are still not clear. This paper systematically investigated the H, O, S and Pb isotopes of the Chagele deposit and compared it with the other Pb-Zn (Cu-Mo) deposits in the middle-east segment of NPMB. Isotopic geochemical analyses showed that the fluids have δ18O values of -2.2‰ to 2.9‰ and δD values of -189‰ to -157‰, respectively, indicative of mixing between magmatic and meteoric waters. The bimodal distribution of δ34 S values for sulfides (-5.6‰ to -0.8‰, the average: -3.7‰ and 1.1‰ to 2.6‰, the average: 1.8‰) indicated that sulfur of the ores were derived from both wall rocks and magma, while the Cu-Mo orebodies was mainly derived from the granite porphyry. The sulfides have 206Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb values in ranges of 18.614 to 18.688, 15.657 to 15.747 and 38.988 to 39.269; similarly the granite porphyries have 206Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb values of 18.663 to 19.058, 15.643 to 15.664, and 39.002 to 39.559, respectively, implying that both of them were originated from the upper crust. The H-O-S-Pb isotopic characteristics of the Chagele deposit are similar to those of the Pb-Zn polymetallic deposits in the mid-east NPMB, suggesting that these deposits have similar ore-forming fluid and material sources. It can be concluded that the Chagele deposit is a typical porphyry type Mo deposit + skarn type-hydrothermal vein type of Cu-Pb-Zn deposit. Moreover, we argue that the mineralization is not only confined to the mid-east NPMB, the western segment of the belt with similar tectonic-magmatism also has high potential of ore mineralization. © 2018, Science Press. All right reserved.
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页码：467 / 479
页数：12
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