| 中阿尔泰造山带北缘早泥盆世构造环境探讨:来自托普色克他乌地区过铝质花岗岩年代学和地球化学的制约 |
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| 引用本文： | 赵端昌,蔺新望,张亚峰,王星,张振凯,曾忠诚,赵江林.中阿尔泰造山带北缘早泥盆世构造环境探讨:来自托普色克他乌地区过铝质花岗岩年代学和地球化学的制约[J].矿物岩石,2019(1):63-73. |
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| 作者姓名： | 赵端昌 蔺新望 张亚峰 王星 张振凯 曾忠诚 赵江林 |
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| 作者单位： | 陕西省矿产地质调查中心 |
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| 基金项目： | 中国地质调查局"阿尔泰成矿带喀纳斯和东准地区地质矿产调查"项目(DD20160006/12120114040601) |
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| 摘 要： | 中阿尔泰造山带北缘早泥盆世花岗岩的年代学和地球化学研究,对探讨该地区早泥盆世构造格架和演化过程具有重要意义。针对侵入于喀纳斯群哲里开特组的托普色克他乌花岗闪长岩体进行LA-ICP-MS锆石U-Pb定年,获得其^( 206)Pb/238U加权平均年龄为404 Ma±3.2 Ma(MSWD=0.32),为早泥盆世岩浆活动的产物。全岩地球化学分析表明,岩石具有高硅(wSiO2
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| 关 键 词： | 锆石U-PB定年 地球化学 过铝质花岗岩 早泥盆世 阿尔泰造山带 |
DISCUSSION OF TECTONIC SETTING OF THE EARLY DEVONIAN IN THE NORTHERN MARGIN OF THE CENTRAL ALTAI OROGENIC BELT: CONSTRAINTS FROM THE GEOCHRONOLOGY AND GEOCHEMISTRY OF PERALUMINOUS GRANITE IN THE TUOPUSEKEWU AREA |
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| ZHAO Duanchang,LIN Xinwang,ZHANG Yafeng,WANG Xing,ZHANG Zhenkai,ZENG Zhongcheng,ZHAO Jianglin.DISCUSSION OF TECTONIC SETTING OF THE EARLY DEVONIAN IN THE NORTHERN MARGIN OF THE CENTRAL ALTAI OROGENIC BELT: CONSTRAINTS FROM THE GEOCHRONOLOGY AND GEOCHEMISTRY OF PERALUMINOUS GRANITE IN THE TUOPUSEKEWU AREA[J].Journal of Mineralogy and Petrology,2019(1):63-73. |
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| Authors: | ZHAO Duanchang LIN Xinwang ZHANG Yafeng WANG Xing ZHANG Zhenkai ZENG Zhongcheng ZHAO Jianglin |
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| Institution: | (Shanxi Mineralogical and Geological SurveyCenter, Xian 710068,China) |
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| Abstract: | Geochronological and geochemical studies of Early Devonian granitoids in the northern margin of the central Altai orogenic belt are significant for the investigation of early Paleozoic tectonic framework and evolution. In this paper,LA-ICP-MS zircon U-Pb dating for granodiorite that intruded into the Zhelikaite formation of the Kanasi Group in northern margin of the central Altai orogenic belt yielded a 206Pb/238U age of 404 Ma±3.2 Ma(MSWD=0.32),which represented the formation time of the early Devonian granodiorite. Whole-rock geochemical results show that the granodiorite is characterized by high silicon(wSiO2=69.57%~74.21%) and alkali(wK2O=3. 42%~4.47%),as well as low titanium and magnesium(wTiO2=0. 23%~0.60%;wMgO=0. 44 %~1.39%), in addition Aluminum Saturation Index (A/CNK) are 1.07~1.18. These chemical characteristics suggest that the granodioriteis classified as high potassium calc-alkaline peraluminous granitic series. The studied granodiorite samples are relatively enriched in light rare earth elements((La/Yb)N = 5.31~7. 81) with significant Eu negative anomalies (δEu = 0.41~0.57),as well as trace elements such as Rb,Th, La,Ce and Sm, whereas depleted in high fieldstrength elements like Nb,Ta and Ti,indicating that the granodiorites are typical of arc-affinity.The geochemical signatures imply that these granodiorites were generated by the upper crust materials which mingled with little amount of mantle materials, thereafter, undergone crystal fractionation. Comprehensive analyses and studies suggest that the granodiorite in the northern margin of the Altai orogenic belt was mainly generated in an arc geotectonic setting related with the subduction of Paleo-Asian ocean beneath the Siberia plate. |
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| Keywords: | zircon U-Pb dating geochemistry peraluminous granite early Devonian Altai orogenic belt |
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