Tectonic dome, consisting of Devonian to Triassic strata that underwent Late Triassic greenschist facies metamorphism. These rocks are overlain by Carboniferous calcareous slate and micaschist, Early Permian marble and Late Permian basalts of the Dashibao Formation, which are believed to form part of the Emeishan continental flood basalt system.
Four mafic-ultramafic sills intruding Devonian carbonaceous marble and graphitic schists in the center of the Yangliuping dome are the hosts for PGE-bearing Ni-Cu-sulphide mineralizations (Daqiangyanwo, Xiezuoping, Yangliuping and Zhengziyanwo ore blocks). The sills are believed to have acted as conduits for the overlying Dashibao formation basalts where the magma passed through prior to eruption. The rocks have been modified by hydrothermal activity and now chiefly consist of serpentinite, talc schist, tremolite schist and meta-gabbro. Disseminated Cu-Ni-sulphide mineralization (with 0.2-2 g/t PGE), accounting for more than 95% of the ore reserves, occurs abundantly in the serpentinite in the lower parts of the sill. Massive sulphide minerals (with 1-8 g/t PGE) occur at the base of the sill and in the footwall along fractures beneath the mineralized serpentinite. There also exist independent ore bodies which were formed by hydrothermal replacement and are hosted in limestones and shales instead of magmatic rocks. These ore bodies were preferentially mined because of their high grades of copper and nickel (e.g. Yuhaizi ore block).
Sulphides also occur in small, uneconomic veinlets, with quartz and calcite as gangue minerals. Contact metamorphic minerals, including slender prismatic diopside and granular epidote or garnet, occur locally in marble near the boundaries of the sill.
Located about 30 km south of Danba.
References
- Platinum metal mineral research group, Kweiyang Institute of Geochemistry (1974): Telluro-stibnide of palladium and nickel and other new minerals and varieties of platinum metals. Geochimica 3(3), 169-181.
- Dunn, P.J., Chao, G.Y., Grice, J.D, Ferraiolo, J.A., Fleischer, M., Pabst, A., and Zilczer, J.A. (1985): New Mineral Names. American Mineralogist 69, 565-569.
- Denghong Wang, Yingshi Chu, Fuxun Luo, Zhi'an Lu, and Zhixin Tang (2000): The origin of the Cu-Ni-PGE orebody in Yangliuping, Sichuan Province, and the significance of its discovery. Acta Geoscientia Sinica 21(3), 260-265.
- Deng, H.-L., Campbell, A.J., and Humayun, M. (2002): Platinum Group Elements in sulfides from Yangliuping Cu-Ni-Pt-Pd Deposit in Sichuan, China. Goldschmidt Conference Abstracts 2002, A177.
- Xieyan Song, Meifu Zhou, Zhimin Cao, Min Sun, and Yunliang Wang (2003): Ni-Cu-(PGE) magmatic sulfide deposits in the Yangliuping area, Permian Emeishan igneous province, SW China. Mineralium Deposita 38, 831-843.
- Yao, Y., and Viljoen, M.J. (2003): Intrusion-hosted PGE mineralization in the Sichuan province, China. Goldschmidt Conference Abstracts 2003, A560.
- Xieyan Song, Meifu Zhou, Zhimin Cao, Min Sun, and Yunliang Wang (2003): Ni-Cu-(PGE) magmatic sulfide deposits in the Yangliuping area, Permian Emeishan igneous province, SW China. Mineralium Deposita 38, 831-843.
- Jianbin Zheng, Zhimin Cao, Xieyan Song, Wei An, and Ji Liu (2004): PGE geochemistry of the Yangliuping magmatic Ni-Cu-PGE sulfide deposit. Geology and Prospecting 40(5), 16-20.
- Xieyan Song, Meifu Zhou, Keays, R.R., Zhimin Cao, Min Sun, and Liang Qi (2006): Geochemistry of the Emeishan flood basalts at Yangliuping, Sichuan, SW China: implications for sulfide segregation. Contributions to Mineralogy and Petrology 152, 53-74.
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