| 南祁连亚曲含镍铜矿基性杂岩体形成年龄及机制探讨 |
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| 关键词:basic complex ID-TIMS age formation mechanism Ni-Cu deposit Yaqu |
| 基金项目:国家自然科学基金(编号: 40772062, 41102050);中国地质调查局地质大调查项目(编号: 1212010911032, 1212011220897, 121201112088和1212011121092) |
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| The Formation Age of the Yaqu Ni-Cu Bearing Basic Complex in Southern Qilian Mountain and a Discussion on Its Mechanism |
| This paper reports partial achievements in potential evaluation of magmatic type copper-nickel ore resources in Hualong County, Qinghai Province, mainly by field survey and investigation of Yaqu intrusive rocks, and obtained the zircon U-Pb age of rock formation (442.4±1.6) Ma by ID-TIMS. Geochemical studies of the basic complex closely associated with the deposit show that it is characterized by low Ti, depletion of Nb or Ta and enrichment of LREE and large lithosphile elements. These features, combined with the isotope geochemistry, have led the authors to believe that the magma occurred under the condition of the conversion of subduction to collision in 460–440 Ma in the Qilian Mountain and its adjacent areas, and might have resulted from arc magmatism. The results not only have great significance for regional prospecting of Ni-Cu ore resources in Hualong area but also have reference value for enrichment of the knowledge of early Paleozoic magmatic Ni-Cu sulfide deposits and their formation mechanism. |
| ZHANG Zhao-wei,LI Wen-yuan,GAO Yong-bao,ZHANG Jiang-wei,GUO Zhou-ping,LI Kan,WANG Ya-lei,QIAN Bing.2012.The Formation Age of the Yaqu Ni-Cu Bearing Basic Complex in Southern Qilian Mountain and a Discussion on Its Mechanism[J].Acta Geoscientica Sinica,33(6):925-935. |
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