Huangshan-Jingerquan copper-nickel mineralization belt is located in Late Paleozoic eastern Tianshan orogenic belt, which is part of the Central Asian orogenic belt. This mineralization belt is the second largest copper-nickel deposit base in China other than the Jinchuan deposit, with total reserves of copper, nickel up to one million tons. The Huangshanxi Cu-Ni ore deposit is one of the large deposits in the Huangshan-Jingerquan copper-nickel mineralization belt. The average grade of copper is 0. 31%, with a total reserve of 188000 tons, average grade of nickel is 0.49%, with a total reserve of 32 million tons. The geochemical characteristics of the Huangshanxi rocks are significantly different from mafic-ultramafic rocks in Tarim large igneous province. The mafic-ultramafic intrusions in Huangshan-Jingerquan mineralization belt were emplaced at 269 similar to 298Ma, which were earlier than the mafic-ultramafic intrusions in Tarim large igneous province (272 similar to 274Ma). In addition, no Early Permian extensive flood basalt outcrop was observed. The Huangshanxi intrusuion is characterized by significant Nb, Ta, Ti negative anomalies, low ((87)Sr/(86)Sr)(269Ma) (0. 7034 similar to 0. 7037), and high epsilon(Nd(269Ma)) (5. 14 similar to 7. 14). These geochemical characteristics can not be explained by crustal contamination, but indicate that the primitive magma may be derived from partial melting of a metasomatized mantle source and formed in the active continental margin. However, the petrographic characteristics of the Huangshanxi intrusive rocks are different from Alaskan-type mafic-ultramafic intrusive rocks, therefore, it can not be excluded that partial melting of the metasomatized mantle occurred in a post-collisional extensional environment and the upwelling of asthenosphere may play an important role.

Publication name	ACTA PETROLOGICA SINICA　Volume: 27 　Issue: 12 　Pages: 3640-3652 　Published: DEC 2011
Author(s)	Deng YuFeng; Song XieYan; Chen LieMeng; Cheng SongLin; Zhang XinLi; Li Jun
Corresponding author	DENG Yufeng  dyfeng_214@sina.com, songxieyan@vip.gyig.ac.cn  Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550002, Peoples R China

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