| 帕米尔构造结塔什库尔干碱性杂岩同位素年代学研究 |
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| 引用本文： | 柯珊,罗照华,莫宣学,张文会,梁涛,詹华明.帕米尔构造结塔什库尔干碱性杂岩同位素年代学研究[J].岩石学报,2008,24(2). |
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| 作者姓名： | 柯珊 罗照华 莫宣学 张文会 梁涛 詹华明 |
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| 作者单位： | 1. 中国地质大学地质过程与矿产资源国家重点实验室,北京,100083;中国地质大学地球科学与资源学院,北京,100083
2. 中国地质大学地球科学与资源学院,北京,100083 |
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| 基金项目： | 国家重点基础研究发展规划项目
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教育部博士点新教师基金
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中国地质大学(北京)青藏高原创新团队和国家自然科学基金项目(40472038)资助成果 |
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| 摘 要： | 利用高精度锆石SHRIMP U-Pb法测定了帕米尔构造结中东部塔什库尔干碱性杂岩的年龄,岩体不同岩石类型的年龄均为11Ma,与野外证据吻合。通过与该杂岩体钾长~(40)Ar/~(39)Ar等时线年龄(23Ma、13Ma)对比研究,~(40)Ar/~(39)Ar定年结果明显偏老,认为是由于钾长石中含有过剩氩所致,并分析了过剩氩存在的可能原因。因此塔什库尔干碱性杂岩的活动时代可以确定为11Ma,而且钾长石不宜作为该杂岩体测年的理想对象。结合岩体的成因及构造意义,认为在11Ma前,帕米尔构造结地区已具有加厚下地壳的特征。
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| 关 键 词： | 帕米尔 塔什库尔干 碱性杂岩 SHRIMP U-Pb年龄 过剩氩 |
The geochronology of Taxkorgan alkalic complex, Pamir syntax |
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| KE Shan LUO ZhaoHua MO XuanXue ZHANG WenHui LIANG Tao ZHAN HuaMing State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Beijing ,China School of Earth Science and Mineral Resources,China University of Geosciences,Beijing ,China.The geochronology of Taxkorgan alkalic complex, Pamir syntax[J].Acta Petrologica Sinica,2008,24(2). |
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| Authors: | KE Shan LUO ZhaoHua MO XuanXue ZHANG WenHui LIANG Tao ZHAN HuaMing State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Beijing China School of Earth Science and Mineral Resources China University of Geosciences Beijing China |
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| Institution: | KE Shan LUO ZhaoHua MO XuanXue ZHANG WenHui LIANG Tao ZHAN HuaMing State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Beijing 100083,China School of Earth Science and Mineral Resources,China University of Geosciences,Beijing 100083,China |
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| Abstract: | We obtain the precise ages,11Ma,of different rock types from the Taxkorgan alkalic complex,Middle East of Pamir syntax by using SHRIMP U-Pb zircon,which is consisted with the field evidence.~(40)Ar/~(39)Ar dating of K-feldspar was also be used for this complex.Comparison between the two methods shows that the ~(40)Ar/~(39)Ar isochrone ages (23Ma and 13Ma) are obviously older than these of zircons,suggesting that the K-feldspar may probably have excess argon.Thus the K-feldspar is not the favorable object for ~(40)Ar/~(39)Ar dating to this alkalic complex with the possible reasons for excess argon presence.Therefore,the time of emplacement of the Taxkorgan alkalic complex could be confirmed as 11Ma.To combine with its petrogenesis,the Pamir syntax was already characterized with a thickened lower crust at least before 11 Ma. |
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| Keywords: | Pamir Taxkorgan Alkalic complex SHRIMP U-Pb age Excess argon |
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