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Noble Gas Isotope and Silicon Isotope Trace the Crust-mantle Effect in the Ore-Forming Process : Example as Alkali-Rich Porphyry Polymetallic Depoists in Western Yunnan , China
| Content Provider | Semantic Scholar |
|---|---|
| Author | Xian-Fan, Liu Min, Zhang Qiu-Xia, Lu Fufeng, Zhao Biping, Deng Yating, Chu Chun-Hui, Li Xiang-Feng, Song |
| Copyright Year | 2013 |
| Abstract | Influenced by India-Eurasia continental subduction and collision, Sanjiang area widely developes Cenozoic magmatic activity between the west margin of Yangtze platform and the southeast margin of Qinghai-Tibet Plateau. A large number of alkaline-rich porphyry and polymetallic deposits distribute along the JingshajiangAilaoshan–Honghe faults zone. There are typical ore deposits, such as, Machangqing Cu-Mo-Au deposit in Xiangyun, Beiya Pb-Au deposit in Heqing, Yaoan Pb-AgAu deposit in Heqing, Jinding Pb-Zn deposit in Lanping and Laowangzhai Au deposit in Zhenyuan. The genesis of alkali-rich porphyry polymetallic deposits has been highly researched by previous authors in western Yunnan, but the ideas on genetic mechanism of these deposits are still diverse, such as rift tectonics genetic model (Zhang et al., 1987), lithospheric thickening model (Chung et al., 1998), fracture strike-slip-extension model (Lv and Qian, 2000; Hou et al., 2003) and plate subduction model (Liu et al., 2000; Hou et al., 2004). Hou et al. (2008) and Mo et al. (2009) studied and confirmed the existence of crust-mantle transition zone, suggesting that the Cenozoic shoshonite series magma was derived from crust-mantle transition zone, however, the formation mechanism of the deposits had not been given in detail. Noble gas isotope has the characteristics of stable chemical activity and low content in the geological body, and the content or the variation of noble gas isotopic composition is more sensitive than that of any other element in the geological process, so noble gas isotope is the good tracer for the origin of oreforming fluid and the metallogenetic and petrogenetic processes (Harrison et al., 1999; Cécile et al., 2005; Sun et al., 2006; Ye et al., 2007). Furthermore, it is highly regarded that the silicon isotope analysis method is gradually applied in the geological research. It can all get a significant effect that silicon isotope analysis methods were applied to solve the cause problem of some lead-zinc deposits(Jiang et al., 1992a), the characteristics of silicon isotopic compositions was the tracer for the source of silica in Precambrian magnet quartzite with ore-bearing formations(Jiang et al., 1992b) and applied directly to the sedimentary facies analysis (Song et al., 1989). Through the research of noble gas isotope of fluid inclusions in ore minerals and silicon isotope in rock mass and vein, the author reveals the mantle fluid metasomatism and crust-mantle mixing characteristics in the course of metallogenesis of alkalirich porphyry polymetallic deposits in western Yunnan. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.geojournals.cn/dzxben/ch/reader/create_pdf.aspx?falg=1&file_no=dzxben2003z10130&quarter_id=Z1&year_id=2013 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
