- 责任者：Hu Yizhou (Department of Earth Sciences ; Zhejiang University ; Hangzhou 310027 ; China) ; Li Zilong
- 刊名：Acta Petrologica Sinica
- 出版年：2013
- 卷期：29(10)
- 关键词：银矿 ; silver ores ; 铅锌矿床 ; lead-zinc deposit ; 浙江 ; Zhejiang Province
- 页码：p.3623-3636
- 图表：8 illus., 3 tables, 40 refs.
- 分类号：1001
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
The northwestern Zhejiang Province, located in the southern part of the Yangtze block, belongs to a part of the Qinzhou Hangzhou metallogenetic belt together with the northeastern Jiangxi Province. Mineral occurrence and metal and non-metal mineral compositions from the samples in the Yinshan ore district in the Chun＇ an County of the northwestern Zhejiang Province are analyzed using the SEM and EPMA techniques, and then enrichment mechanism of metal elements （e. g. , silver, lead and zinc） and mineralization are discussed in this study. The polymetallic ore deposit of silver, lead, zinc and copper in the Yinshan area, layered and layered-like distributed, mainly occurs in the fracture zone between the upper Lantian and Piyuancun formations, and the interface of the lithology boundary partly as well as that between the dolomitized limestone in the bottom of the Lantian Formation and conglomeratic mudstone in the Nantuo Formation. Two groups of metallic mineral assemblages are subdivided. One is pyrite chalcopyrite-galena-sphalerite assemblage, located between the Lantian Formation and Piyuancun Formation, indicating a hydrothermal mineral group formed under a medium to low-temperature condition. The other is pyrrhotite-arsenopyrite-sphalerite assemblage, located between the bottom of Lantian and the Nantuo formations, recognized as a hydrothermal mineral group formed under the medium temperature condition. The gangue minerals in the area are such as quartz, calcite, chlorite and muscovite, particularly, clinopyroxene. According to a chemical study, clinopyroxene in the area has two types of hedenbergite and diopside, indicating an influence of strong hydrothermal process. The main metallic minerals are galena, sphalerite, pyrite, pyrrhotite, arsenopyrite, chalcopyrite; and the silver element is enriched mainly in the galena. There are granular and replacement remnant, disseminated and net-veined textures, and mass structure. We proposed a metallogenetic mechanism that the metallic elemental enriched sedimentary layer of the Lantian Formation can be as an ore source for the formation of the deposit; a Yanshanian felsic magmatism along a faulted zone provides not only hot to make the polymetallic elements even more enriched, but some metallic fluids, and then the Yinshan ore deposit is formed along the lithological interface of the earth chemical barrier.