| 东天山三宫铜镍矿化岩体年代学、岩石地球化学特征及对Cu-Ni找矿的启示 |
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| 关键词:Sangong Cu-Ni mineralization intrusion zircon U-Pb dating magma source prospecting potential Harlik |
| 基金项目:国土资源部公益性行业科研专项(编号: 201511020);国家自然科学基金项目(编号: 41302052) |
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| Chronological and Geochemical Characteristics of Sangong Cu-Ni Mineralization Intrusion in Eastern Tianshan of Xinjiang and Their Implications for Cu-Ni Mineralization |
| The Sangong Ni-Cu mineralization intrusion is a newly-discovered intrusion located in the eastern section of Harlik Mountain, Eastern Tianshan Mountains. The intrusion was emplaced in biotite granite and granodiorite and mainly consists of gabbro, plagioclase pyroxenite and plagioclase-bearing olivine pyroxenite. Zircon LA-ICP-MS U-Pb age of plagioclase-bearing olivine pyroxenite is (281.7±2.6) Ma, indicating that the mafic intrusion was formed in the Early Permian. The values of MgO and FeOT show positive correlation, and there is a negative relationship between MgO and SiO2, CaO, Al2O3, implying that the major element compositions are mainly controlled by the abundances of olivine and pyroxenes. The chondrite-normalized REE patterns show significant enrichment of light REE relative to heavy REE ((La/Yb)N=5.02~7.04). Most of the mafic rocks are characterized by positive Eu anomalies. The rocks are enriched in LILE (Cs, Sr, Ba) and depleted in HFSE (Nb, Ta, Ti). Sr-Nd isotopic simulation indicates that the parental magma of the rocks experienced about 10% contamination of lower crust material. The magma source was replaced by melt fluid, and partial melting mainly occurred in the granet stability field. The chronological and geochemical characteristics, together with regional evolution history of Harlik Mountain, indicate that the Sangong Cu-Ni mineralization intrusion might be the product of post-collision extension. The Harlik area may have a huge potential for Cu-Ni ore exploration. |
| WANG Ya-lei,ZHANG Zhao-wei,YIN Xi-wen,LI Kan,YOU Min-xin,WANG Bo-lin.2016.Chronological and Geochemical Characteristics of Sangong Cu-Ni Mineralization Intrusion in Eastern Tianshan of Xinjiang and Their Implications for Cu-Ni Mineralization[J].Acta Geoscientica Sinica,37(6):699-710. |
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