Geological Characteristics, Genesis and Metallogenic Time of the Heiniudong Copper-Zinc Deposit in Jiulong County, Sichuan Province
详细信息
- 责任者：Li Jianzhong (Qinghai-Tibetan Plateau Geology Research Room ; Chengdu Institute of Geology and Mineral Resources ; Chengdu 610081 ; China) ; Liu Yuping
- 刊名：Acta Geologica Sinica
- 出版年：2012
- 卷期：86(12)
- 关键词：铜矿 ; copper ores ; 锌矿 ; zinc ores ; 四川 ; Sichuan Province
- 页码：p.1972-1993
- 图表：6 illus., 2 plates, 4 tables, 70 refs.
- 分类号：1001
- issnNo：ISSN0001-5717
- isbnNo：CN11-1951/P
摘要
///Through geological mapping, trenching, drilling, and indoor analyses, the Heiniudong Copper-Zinc Deposit was a large or even super-large marine volcanic-associated massive sulifide deposit (VMSD) in the passive continental margin rift during the middle Proterozoic. The deposit dominated by massive, para-massive and brecciated ores is enriched in copper, with an average Cu grade of 1.68% and an average Zn grade of 1.53%. Mineralization is closely related to bleached zone and silicification. Mineralization is characterized by extensively-developed ductile shear-type disseminated rock or ores and is of the same deformation features as mylonite and phyllonite. Multiple mineralized metallic lens, deformation bands and microfolds can be found in the ores. Texture and structure of the ores, and their spatial and temporal distribution, and H, O, S, Pb and Si isotopic features show that massive, para-massive and breccias ores are shear-type mineralized rocks or ores, suggesting that the deposit is a metamorphosed deposit, i.e. a reactivated deposit from primary ores. The shear-type mineralized rock or ores are likely a dissolution-dominated reactivated residual of the VMSD deposit which underwent multiple ductile deformation and metamorphic deformation due to middle Proterozoic submarine volcano and rifting. The deposit is characterized by in-site ductile deformation and metamorphic regeneration, with the mineralization age in late Yanshanian epoch (134.26±0.5 Ma).
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