| 青海省阿什贡含镍矿镁铁-超镁铁岩体形成时代及其对成矿机制的启示 |
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| 关键词:mafic-ultramafic intrusion formation age metallogenic mechanism Ni deposit Agong Qinghai Province |
| 基金项目:国家自然科学基金项目(编号: 40772062; 41102050);中国地质调查局地质大调查项目(编号: 1212010911032; 1212011220897; 121201112088; 1212011121092) |
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| Formation Age of Agong Ni-bearing Mafic-ultramafic Intrusion in Qinghai Province and Its Enlightenment to Metallogenic Mechanism |
| This paper reports partial achievements in the evaluation of magmatic nickel ore resources potential in Hualong County, Qinghai Province, mainly on the basis of field survey and study of Agong mafic-ultramafic intrusion, which is composed of peridotite, pyroxenite, hornblendite and meta-gabbro. The authors obtained the zircon U-Pb age of (436.1±1.2) Ma by LA-ICP-MS. Geochemical studies of the mafic-ultramafic intrusion closely associated with the deposit show that it is characterized by low Ti, depletion of Nb and Ta, and enrichment of LREE and large lithosphile elements. These features, combined with the geochemical characteristics and isotope composition of other mafic-ultramafic intrusions in Hualong rocks belt, have led the authors to believe that the magma occurred during the conversion from the subduction to the collision in 460~440 Ma in the Qilian Mountain and its adjacent areas, and mineralization was the result of arc magmatism. These achievements are not only of great significance for regional prospecting of Ni-Cu ore deposits in Hualong area but also of reference value for the enrichment of studies of Early Paleozoic mafic-ultramafic intrusions and their magmatic Ni-Cu sulfide deposits and formation mechanism. |
| ZHANG Zhao-wei,LI Wen-yuan,GUO Zhou-ping,WANG Ya-lei,GAO Yong-bao,ZHANG Jiang-wei,LI Kan,QIAN Bing.2014.Formation Age of Agong Ni-bearing Mafic-ultramafic Intrusion in Qinghai Province and Its Enlightenment to Metallogenic Mechanism[J].Acta Geoscientica Sinica,35(1):59-66. |
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