| Metallogenic Series Related to Permian Mafic Complex in North Xinjiang: Post-collisional Stage or Mantle Plume Result? |
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| 作者姓名： | WANG Yuwang WANG Jingbin WANG Lijuan LONG Lingli |
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| 作者单位： | School of the Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China; Beijing Institute of Geology for Mineral Resources, Beijing 100012, China;Beijing Institute of Geology for Mineral Resources, Beijing 100012, China;Beijing Institute of Geology for Mineral Resources, Beijing 100012, China;Beijing Institute of Geology for Mineral Resources, Beijing 100012, China |
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| 基金项目： | This research was funded by the ‘National Basic Research Program of China’ (Nos 2007CB411304, 2001CB409806). |
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| 摘 要： | There are four deposit types related to a Permian mafic complex in northern Xinjiang, i.e., copper-nickel sulfide deposit, vanadic titanomagnetite deposit, magnetite （-cobalt） deposit and Cu-Ni- VTiFe composite deposit. The deposits are distributed spanning tectonic units with close and consecutive metallogenic ages. A transitional deposit type can occur among the end-member deposits. Trace elements of host rocks show that they can derive from similar source area. Hence, they constitute a particular metallogenic series related to a mafic-ultramafic complex that is also a symbol series of the post-collisional stage of the Central Asia Metallogenic Province （CAMP）. The metallogenic ages of the series are between 260 Ma and 300 Ma throughout the Permian. Unlike mineralization from a mantle plume, the metallogenic period of this series spans at least 40 Ma. Compared with related deposits of the Emeishan mantle plume, the North Xinjiang series has a similar ore-forming element assemblage but has preferably developed Cu-Ni sulfide deposits rather than vanadic titanomagnetite deposits. In concomitance with this series, North Xinjiang area has developed a set of syntectonic Au-Cu-Mo metallogenic series related to a felsic volcanic-intrusive complex, which might indicate that there is no direct relationship with mantle plume activity. From early to late, i.e., the sequence of copper-nickel sulfide to magnetite （-cobalt） to vanadic titanomagnetite deposit, the host rock series evolves from mafic-ultramafic and tholeiite series to mafic and alkalic series, the ~REE content tends to increase with increasing of REE fractionation, and some of the trace elements （particularly LIL） also show an increasing tendency. The above evolutionary regularity possibly reflects a course where the magma source deepens and thermal interface moves down, energy gradually exhausts, and neo-continental crust forming in the postcollision stage tends to stabilize.
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| 关 键 词： | 金属矿物序列 铁镁质矿物 地幔浆 二叠纪 新疆 |
| 收稿时间： | 3/3/2008 12:00:00 AM |
| 修稿时间： | 5/4/2008 12:00:00 AM |
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