| 新疆可可托海伟晶岩田岩浆活动时限与伟晶岩形成 |
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| 关键词:Koktokay granite pegmatite zircon LA-ICP-MS dating |
| 基金项目:公益性科研院所基本科研业务费专项资金项目(编号: JYYWF20180104);国家自然科学基金面上项目(编号: 41273017);国土资源部公益性行业科研专项课题(编号: 200911007-10) |
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| Constraints on Timing of Magmatic Activity and Formation of Pegmatite in the Koktokay Pegmatite Field, Xinjiang |
| The Koktokay pegmatite field is the most important pegmatite area in the Altay Orogenic Belt in Xinjiang. A large number of granites and pegmatite dikes are developed in this field. The authors carried out zircon U-Pb LA-ICP-MS dating for four different granitic plutons occurring in the middle-west field and quartz-spodumene zone in the No.3 pegmatite vein. Several weighted average ages were obtained with (408.9±1.1) Ma (MSDW=1.7) for metamorphic biotite monzogranite, (398.6±1.3) Ma (MSDW=0.67) for metamorphic biotite granodiorite, (395.5±1.3) Ma (MSDW=0.50) for porphyritic mica granite, (388.4±1.1) Ma (MSDW=1.8) for biotite granite and (209.4±1.3) Ma (MSDW=0.33) for quartz-spodumene zone, respectively. Based on many reliable chronological achievements from previous researchers, the authors suggest two periods of magmatic activities in the Koktokay Pegmatite Field. One is the Early–Middle Devonian mafic and acid magmatic intrusion with the peak of 400 Ma, and the other is the Middle–Late Triassic intrusions of granitic magma (218–210 Ma) and related pegmatite magma-hydrothermal activity (211–202 Ma), which constitute a complete granite-pegmatite system. |
| YAN Jun-wu,LIU Feng,SHEN Ying,ZHANG Zhi-xin.2020.Constraints on Timing of Magmatic Activity and Formation of Pegmatite in the Koktokay Pegmatite Field, Xinjiang[J].Acta Geoscientica Sinica,41(5):663-674. |
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