Geological and mineralogical characteristics of the Miaoding copper-gold deposit in Mianning, Sichuan Province and their metallogenic significance

被引：0
|
作者：
Xin C. [1 ]
Liu H. [1 ]
Xu M. [1 ]
An G. [2 ]
Hu J. [3 ]
机构：
[1] College of Geography and Environmental Science, Northwest Normal University, Lanzhou, 730070, Gansu
[2] The 282 team of Sichuan Nucleus Industrial Geology Bureau, Deyang, 618000, Sichuan
[3] Faculty of Geomatics, Lanzhou Jiaotong University, Lanzhou, 730071, Gansu
来源：
Dizhi Xuebao/Acta Geologica Sinica | 2019年 / 93卷 / 12期
关键词：
Geological characteristics; Mianning; Miaoding Au-Cu deposit; Mineralogical characteristics; Type of deposit;
D O I：
10.19762/j.cnki.dizhixuebao.2019123
中图分类号：
学科分类号：
摘要：
The Miaoding copper-gold deposit, located at the junction of the Tethys metallogenic domain and the littoral Pacific metallogenic domain and in the intersection zone of many metallogenic prospective areas, has excellent metallogenic conditions. The orebodies occur in the strata of Devonian carbonated tuff, argillaceous silty slate, carbonated micritic limestone and Permian metamorphic basalt. Petrography analysis shows that the ore types of the deposit include copper-gold mineralized carbonate quartz vein type ore, copper-gold mineralized metamorphic rock type ore and albitite type ore of copper mineralization. Mineralography studies show that copper minerals are mainly sulfide, followed by oxidized type, and occur mainly as chalcopyrite, followed by bornite and covellite. Gold occurs dominantly as Ag-bearing native gold, followed by electrum, and free gold is the main recycling target. The metallic minerals formed in an order of magnetite→pyrite→native gold, electrum, chalcopyrite, bornite, chalcocite, tetrahedrite, pyrrhotite→galena, covellite, digenite→limonite, malachite, azurite, atacamite. The formation of the deposit experienced three periods: metamorphic, hydrothermal and supergene periods. Among them, the hydrothermal period is divided into three phases: albite-mica-pyrite stage (Ⅰ), gold-quartz-polymetallic sulfide stage (Ⅱ) and carbonate-quartz-barite stage (Ⅲ). The results of the electron probe show that the formation of the deposit experienced a process from high temperature to low temperature changes, suggesting that it belongs to magmatic hydrothermal deposit. © 2019, Science Press. All right reserved.
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页码：3125 / 3143
页数：18
相关论文
共 35 条
  • [1] Bodnar R.J., Heavy Metals ot Punk Rocks, Science, 323, pp. 724-725, (2009)
  • [2] Bralia A., Sabatini G., Troja F., A revaluation of the Co/Ni ratio in pyrite as geochemical tool in ore genesis problems, Mineralium Deposita, 14, 2, pp. 353-374, (1979)
  • [3] Chen Y., Wang D., Chen Z., Xu Z., Li J., Zong Y., Sheng J., Xu Y., Yuan Z., Bai G., Zhu M., Li H., Gao L., Li H., Qu W., Chen W., Wang Y., Zhang Y., Ye H., Ying L., Wang C., Liu S., Fu X., Technical Requirements on the Study of Regularity of Major Mineral Resources and Regional Metallogenic Regularity in China, (2010)
  • [4] Ding H., Ge W., Dong L., Deng G., Jia H., Zhang J., Chen J., Yuan Q., Genesis of the Luyuan Gold Deposit, East Junggar, Xinjiang: Constraints from Fluid Inclusions and Isotopic Compositions, Acta Geologica Sinica, 92, 4, pp. 787-803, (2018)
  • [5] Gu X., Liu L., Dong S., Zhang Y., Li K., Li B., Immiscibility during mineralization of Yinan Au-Cu-Fe deposit, Shandong Province: Evidence form fluid inclusions and H-O isotopes, Mineral Deposit, 29, 1, pp. 43-57, (2010)
  • [6] Li H., Tree ore-forming fluids of basalt copper deposits in Emeishan, Journal of Minerals, pp. 219-220, (2009)
  • [7] Li H., Mao J., Xu Z., Chen Y., Zhang C., Xu H., Copper mineralization characteristics of the Emeishan basalt in the Yunnan-Guizhou border area, Acta Geoscientica Sineca, 5, pp. 495-502, (2006)
  • [8] Li H., Mao J., Zhang C., Geochemistry of fluid inclusions of the basalt copper deposits in asjacent area of northeastern Yunnan and western Guizhou, Journal of Earth Sciences & Environment, 33, 1, pp. 14-23, (2011)
  • [9] Li H., Mao J., Zhang C., Xu H., Chen Y., Wang D., Isotopic geochemistry of Emeishan basalt copper deposits in northeastern Yunnan and western Guizhou, Mineral Deposits, 23, 2, pp. 232-240, (2004)
  • [10] Li S., The source beds and mineralization model for the gold deposits in the Jinpingshan area, Sichuan, Sedimentary Geology and Tethyan Geology, 3, pp. 48-59, (2001)
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