Mineralogical characteristics of the Mamupu copper polymetallic deposit in the southern section of the Yulong copper belt, Tibet

被引：0
|
作者：
Zhang X. [1 ,2 ]
Tang J. [2 ]
Lin B. [2 ]
He L. [3 ]
Shao R. [3 ]
Wang Q. [4 ]
Yan G. [3 ]
Wu Q. [3 ]
Du Q. [3 ]
Zhaxi P. [3 ]
Dai S. [3 ]
机构：
[1] School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing
[2] MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, CAGS, Beijing
[3] No.6 Geological Party, Tibet Bureau of Geology and Mineral Exploration and Development, Tibet, Lhasa
[4] Earth Sciences College, Chengdu University of Technology, Sichuan, Chengdu
来源：
Dizhi Xuebao/Acta Geologica Sinica | 2022年 / 96卷 / 06期
关键词：
deposit genesis; electron probe; Mamupu; mineralogical characteristics; Yulong metallogenic belt in Tibet;
D O I：
10.19762/j.cnki.dizhixuebao.2021247
中图分类号：
学科分类号：
摘要：
The Mamupu copper-polymetallic deposit in Tibet is an important part of the southern section of the Yulong copper belt. The latest exploration progress reveals that the amount of copper and gold resources in the Mamupu copper-polymetallic deposit has reached a medium scale, but the theoretical research is still very weak. Based on systematic microscopic identification and electron probe analysis, this paper studied the mineralogy of Mamupu copper polymetallic deposit in detail, and then explored the genesis of the deposit. The main ore body in the Mamupu deposit is a medium-thick plate breccia-type orebody. The ore type is mainly breccia, and partial lenticular ore bodies were produced in hornstones. Extensive chlorite, keratinization, phlogopite and weak sericite alteration are developed in the mining area. The results of electron probe analysis show that the pyroxene is mainly diopside, the mica is mainly phlogopite, and the amphibole is mainly tremolite in skarn minerals. The metallogenic stage and mineral assemblage of the Mamupu deposit are as follows: I prograde metamorphic stage, the mineral assemblage is diopsidegarnet-magnetite±scheelite; II retrograde metamorphic stage, the mineral assemblage is tremolitephlogopite-magnetite±chlorite±epidote±scheelite; III sulfide stage, mineral assemblage is pyritechalcopyrite±molybdenite±pyrrhotite±bismuthinite±galena±sphalerite±fluorite±quartz, mainly metallogenic stage; IV carbonate stage, mineral assemblage is hematite±fluorite±calcite±quartz±chalcedony. The mineralogical characteristics show that the evolution of skarn experienced a process from high temperature to medium and low temperature after the magmatic period. With the decrease of temperature, magnesian skarn minerals changed from diopside in prograde metamorphic stage to phlogopite in retrograde metamorphic stage. Skarn formation experienced a relatively oxidized environment in the early stage to a relatively reductive environment in the late stage.The breccia in the mining area are dolomitic and calcareous carbonate interlayers in the original sedimentary strata, and most of the carbonates are breccia due to extensive hydrothermal metasomatism. The ore-bearing magmatic hydrothermal fluids emplaced and metasomatism occurred along the occurrence of carbonate rocks, resulting in the precipitation and enrichment of metal minerals in breccia strata. © 2022 Geological Society of China. All rights reserved.
引用
收藏
页码：2062 / 2077
页数：15
相关论文
共 63 条
  • [1] Brown P E, Essene E J., Activity variations attending tungsten skarn formation, Pine Creek, California, Contributions to Mineralogy & Petrology, 89, 4, pp. 358-369, (1985)
  • [2] Jia Chang, Jianwwi Li, Andreas Audetat, Formation and evolution of multistage magmatic-hydrothermal fluids at the Yulong porphyry Cu-Mo deposit, eastern Tibet: insights from LA-ICP-MS analysis of fluid inclusions, Geochimica et Cosmochimica Acta, (2018)
  • [3] Chen Jianping, Gu Xuexiang, Tang Juxing, Synthetical research on targets of Cu-Mo (Au) deposit in the northern sector of Yulong metallogenic zone, Tibet, Geological Review, 46, pp. 64-70, (2000)
  • [4] Chen Jianping, Tang Juxing, Cong Yuan, Dong Qingji, Hao Jinhua, Geological characteristics and metallogenic model in the Yulong porphyry copper deposit, East Tibet, Acta Geologica Sinica, 83, 12, pp. 1887-1900, (2009)
  • [5] Chen Wenming, Sheng Jifu, Qian Handong, Degrees of ordering and origin of K-feldspar phenocrysts in a mineralized porphyry of the Yulong porphyry copper deposit, Tibet, Acta Petrologica Sinica, 22, 4, pp. 1017-1022, (2006)
  • [6] Chen Xilian, Huang Wenting, Zou Yinqiao, Liang Huaying, Zhang Jian, Zhang Yuquan, Zircon U-Pb geochronology and geochemistry of ore-bearing porphyries in the southern Yulong porphyry copper belt, and factors resulting in the differences in scale of mineralization between the southern and northern Yulong porphyry copper belt, Acta Petrologica Sinica, 32, 8, pp. 2522-2534, (2016)
  • [7] Crerar D, Susak N J, Borcsik M, Schwartz S., Solubility of the buffer assemblage pyrite+pyrrhotite+magnetite in NaCl solutions from 200 to 350°C, Geochimica et Cosmochimica Acta, 42, 9, pp. 1427-1437, (1978)
  • [8] Dare S, Barnes S, Beaudoin G., Variation in trace element content of magnetite crystallized from afractionating sulfide liquid, Sudbury, Canada: implications for provenance discrimination, Geochimica et Cosmochimica Acta, 88, pp. 27-50, (2012)
  • [9] Dupuis C, Beaudoin G., Discriminant diagrams for iron oxide trace element fingerprinting of mineral deposit types, Mineralium Deposita, 46, 4, pp. 319-335, (2011)
  • [10] Essene E, Brown P., Activity variations attending tungsten skarn formation, Pine Creek, California, Contributions to Mineralogy & Petrology, 89, 4, pp. 358-369, (1985)
1234567