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| Study on the Metallogenesis and Resource Perspective of the Gangdisi Ore Deposit Belt in Tibet |
| LIANG Hua-Ying1, YU Heng-Xiang2, MO Ji-Hai1, ZENG Ti1, HU Guang-Qian1 |
1. Key Laboratory for Metallogenic Dynamics, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;
2. Department of Resources and Environmental Engineering, Guilin University of Technology, Guilin 541004, China |
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Abstract A lot of different types of ore deposits have been found in the Gangdisi belt in Tibet,including porphyry Cu(Au,Mo) deposits,skarn Fe-Cu-Pb-Zn(Ag) deposits,strata-bound mineral deposits,epithermal deposits,and the Xiongcun type Cu-Au deposit.Geological characteristics and a new set of isotope ages of deposits reveal that the deposits found the southern Gangdisi belt have been resulted from the a series of structural-magmatic processes such as the southward subduction of the new Tethyan ocean crust,the collision of Indian plate toward the Asia plate,following by the post-collision.The deposits located in the northern Gangdisi belt are corresponded to the southward subduction of the Bangonghu-Nugiang ocean crust and then the collision of the Qiangtang terrane with the Lhasa terrane.There are a lot of mamatic rocks in the southern and northern borders of the Gangdisi belt resulted from the ocean crust subduction and the afterward continental collision.The strong magmatic activities provided excellent conditions for the formation of different types of ore deposits in the Gangdisi belt.The Tibet Plateau has undergone quick uplift and denudation after Indian-Asia collision.The upside of the most ore deposits croping out in the Gangdisi belt are characterized by relatively low temperature mineral assemblage,suggesting that the most of the deposits protect from denudation.
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Received: 15 May 2008
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