| 西准噶尔拉巴岩体的成因——来自岩石学、年代学和地球化学的证据 |
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| 关键词:geochemistry U-Pb dating Sr-Nd-Hf isotopic composition limited oceanic basin West Junggar |
| 基金项目:中国地质调查局地质调查项目(编号: DD20160083; DD20190011; DD20221643);国家重点研发计划项目(编号: 2018YFC0603700);中国地质科学院基本科研业务费项目(编号: JKY202011) |
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| Petrogenesis of Laba Plutons in West Junggar, Central Asian Orogenic Belt: Evidence from Petrology, Chronology, and Geochemistry |
| The Laba plutons in southwest West Junggar were formed in the Early Permian (285.7~295.1 Ma). They are composed of granite, granodiorite, monzogranite batholith, and a series of granodiorite porphyry, diorite, granite, and other dikes. Minerals mainly consist of quartz, plagioclase, alkali feldspar, hornblende, and biotite. The Laba plutons are characterized by medium-high silicon, calc-alkaline, mafic, and peraluminous with high CaO and Na2O content, Eu weak negative anomaly, high εNd, and low (87Sr/86Sr)i. They are typical I-Type granites formed in the island arc environment of oceanic crust subduction, which can be further divided into high-pressure adakite with high Sr and low Yb content and low-pressure island arc granite with low Sr and high Yb content. In the Early Permian, there may still have been a limited ocean basin in West Junggar, which is of great significance to improvement of the regional tectonic evolution. |
| XU Sheng-lin,CHEN Xuan-hua,MA Fei-zhou,SHAO Zhao-gang,DING Wei-cui,HAN Le-le,WANG Ye.2022.Petrogenesis of Laba Plutons in West Junggar, Central Asian Orogenic Belt: Evidence from Petrology, Chronology, and Geochemistry[J].Acta Geoscientica Sinica,43(6):875-894. |
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