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邓宇峰,宋谢炎,陈列锰,程松林,张新利,李军. 2011. 东天山黄山西含铜镍矿镁铁-超镁铁岩体岩浆地幔源区特征研究. 岩石学报, 27(12): 3640-3652
东天山黄山西含铜镍矿镁铁-超镁铁岩体岩浆地幔源区特征研究
作者单位E-mail
邓宇峰 State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
Graduate University of Chinese Academy of Sciences, Beijing 100049, China
School of Resources and Environmental Engineering, Hefei University of Technology, Heifei 230009, China 
 
宋谢炎 State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China songxieyan@vip.gyig.ac.cn 
陈列锰 State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China  
程松林 Xinjiang Bureau of Geology and Exploration, Urumchi 830000, China  
张新利 No. 6 Geological Team, Xinjiang Bureau of Geology and Exploration, Hami 839000, China  
李军 No. 6 Geological Team, Xinjiang Bureau of Geology and Exploration, Hami 839000, China  
基金项目:本文受国家自然科学重点基金项目(40730420、40973038)、中科院"百人计划"、中科院知识创新方向性项目(KZCX2-YW-Q04)和矿床地球化学国家重点实验室课题(KCZX20090105)联合资助.
摘要:
      新疆黄山-镜儿泉铜镍成矿带位于中亚造山带东天山晚古生代造山带,铜镍总储量达百万吨,是我国仅次于金川硫化物矿床的铜镍矿基地。黄山西铜镍矿床是该成矿带内一个大型矿床,Cu平均品位是0.31%,总储量18.8×104t,Ni平均品位是0.49%,总储量32×104t。黄山西岩体岩石地球化学特征与塔里木大火成岩省镁铁-超镁铁侵入岩和玄武岩存在明显差异;较之塔里木大火成岩省镁铁-超镁铁岩体(269~274Ma),黄山-镜儿泉铜镍成矿带镁铁-超镁铁岩体的形成更早(274~298Ma);此外,成矿带内并没有早二叠溢流玄武岩大量出露。黄山西岩体各岩相的MORB标准化微量元素蛛网图显示明显的Nb、Ta、Ti负异常,(87Sr/86Sr)269Ma值较低(0.7034~0.7037),而εΝd(269Ma) 较高(5.14~7.14),这些地球化学特征难以用地壳混染来解释,而显示其原始岩浆来自于交代地幔的部分熔融,表明原始岩浆可能形成于活动大陆边缘。然而,黄山西岩体的岩相学特征与阿拉斯加型岩体存在差别,因此,不能排除交代地幔的部分熔融发生于碰撞造山后的伸展阶段的可能,软流圈的上涌可能起到重要作用。
英文摘要:
      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 269~298Ma, which were earlier than the mafic-ultramafic intrusions in Tarim large igneous province (272~274Ma). In addition, no Early Permian extensive flood basalt outcrop was observed. The Huangshanxi intrusuion is characterized by significant Nb, Ta, Ti negative anomalies, low (87Sr/86Sr)269Ma (0.7034~0.7037), and high εΝd(269Ma) (5.14~7.14). 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.
关键词:黄山-镜儿泉铜镍成矿带  黄山西镁铁-超镁铁岩体  岩浆铜镍矿床  交代地幔  软流圈
投稿时间:2010-02-09  修订日期:2010-04-20
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