| 东准噶尔乌尊塔格辉长岩LA-ICP-MS锆石U-Pb年龄、地质地球化学特征及构造意义 |
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| 引用本文： | 刘阁,杨硕,靳刘圆,郑海峰.东准噶尔乌尊塔格辉长岩LA-ICP-MS锆石U-Pb年龄、地质地球化学特征及构造意义[J].新疆地质,2019(2):139-145. |
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| 作者姓名： | 刘阁 杨硕 靳刘圆 郑海峰 |
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| 作者单位： | 新疆维吾尔自治区地质调查院 |
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| 基金项目： | 新疆1∶25万北山煤窑幅区调修测项目;新疆区域地质调查片区总结与服务产品开发(DD20160345-04)共同资助 |
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| 摘 要： | 乌尊塔格辉长岩位于东准噶尔地区卡拉麦里造山带东段,卡拉麦里蛇绿混杂岩带北侧。岩性为辉长岩、石英闪长岩。岩石化学成分显示,辉长岩具高Al2O3(18.87%~14.11%)、CaO(8.64%~12.35%),低碱K2O(0.34%~0.86%)、Na2O(1.68%~3.08%)、P2O5(0.06%~0.20%)和TiO2(0.96%~1.76%)特征。岩石具弱富集大离子亲石元素Rb,K,Sr,Ba,显著亏损Nb,Ta,反映源区为受俯冲流体交代改造的岩石圈地幔。锆石LA-ICP-MS测年结果表明,辉长岩形成年龄为(337±17) Ma(MSWD=2.3, n=6)。结合地质背景认为,乌尊塔格辉长岩形成于俯冲结束之后挤压环境向拉张环境过渡的构造环境。
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| 关 键 词： | 东准噶尔 辉长岩 年代学 地球化学 |
LA-ICP-MS Zircon U-Pb Dating,Geological,Geological and Geochemical Features of Wuzuntage Gabbro pluton,Eastern Junggar,and Their Tectonic Significances |
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| Liu Ge,Yang Shuo,Jin Liuyuan,Zheng Haifeng.LA-ICP-MS Zircon U-Pb Dating,Geological,Geological and Geochemical Features of Wuzuntage Gabbro pluton,Eastern Junggar,and Their Tectonic Significances[J].Xinjiang Geology,2019(2):139-145. |
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| Authors: | Liu Ge Yang Shuo Jin Liuyuan Zheng Haifeng |
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| Institution: | (Xinjiang institute of Geological Survey,Urumqi,Xinjiang,830000,China) |
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| Abstract: | Wuzuntage gabbro rock body lies in the eastern Kalamaili Mountains,East Junggar as well as north of Kala- maili ophiolite belt.The lithology is gabbro and quartz diorite.The gabbro consists mainly gabbro is characterized by its high content of Al2O3(18.87%~14.11%) and CaO (8.64%~12.35%),low content of alkali (K2O=0.34%~0.86%,Na2O= 1.68%~3.08%),P2O5(0.06%~ 0.20%) and TiO2(0.96%~1.76%).Rock are enriched in LILE(Rb,K,Sr,Ba) and remarkably depleted in Nb,Ta,.The characteristics of petrography and petrochemistry indicate that the source of magma may be mod- ified by subduction metasomatic fluids.LA-ICP-MS U-Pb dating of zircons from the gabbro yielded ages of (337±17) Ma( MSWD=2.3,n=6).All of these facts suggested that the Wuzuntage gabbro were probably formed in a tectonic set- ting of transition from compression to extension. |
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| Keywords: | Eastern Junngar Gabbro Geochronology Geochemistry |
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