| 东昆仑喀雅克登塔格晚泥盆世花岗闪长岩的发现与地质意义 |
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| 引用本文： | 郝娜娜,袁万明,曹建辉,冯云磊,程学芹,张爱奎.东昆仑喀雅克登塔格晚泥盆世花岗闪长岩的发现与地质意义[J].西北地质,2014(1):107-115. |
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| 作者姓名： | 郝娜娜 袁万明 曹建辉 冯云磊 程学芹 张爱奎 |
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| 作者单位： | 中国地质大学(北京)科学研究院; |
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| 基金项目： | 中国地质调查局地质调查工作项目(基2011-03-04-06);国家自然科学基金项目(41172088,40872141) |
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| 摘 要： | 东昆仑西部祁漫塔格喀雅克登塔格地区地质研究程度低,特别是未曾有晚泥盆世侵入岩的报道或记录。本次工作识别出晚泥盆世花岗闪长岩的存在,经LA-ICP-MS锆石U-Pb同位素定年,其形成时代为(380.52±0.92)Ma,即晚泥盆世。这一发现打破了东昆仑造山带加里东造山旋回幔源岩浆底侵作用发生在早泥盆世(408Ma)—中泥盆世(386Ma)的认识,进而将幔源岩浆底侵作用一直延续至晚泥盆世380Ma,为细化东昆仑西部祁漫塔格加里东造山旋回晚泥盆世的构造背景奠定了基础;喀雅克登塔格晚泥盆世花岗闪长岩产于祁漫塔格加里东造山带后造山伸展崩塌的晚期阶段幔源岩浆底侵作用的构造背景。
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| 关 键 词： | 花岗闪长岩 年代学 地质意义 晚泥盆世 喀雅克登塔格 东昆仑 |
The Recognition of Late Devonian Granodiorite and Its Geological Implication in Kayakedengtage,East Kunlun Mountain,Qinghai-Tibet Plateau |
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| HAO Na-na,YUAN Wan-ming,CAO Jian-hui,FENG Yun-lei,CHENG Xue-qin,ZHANG Ai-kui.The Recognition of Late Devonian Granodiorite and Its Geological Implication in Kayakedengtage,East Kunlun Mountain,Qinghai-Tibet Plateau[J].Northwestern Geology,2014(1):107-115. |
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| Authors: | HAO Na-na YUAN Wan-ming CAO Jian-hui FENG Yun-lei CHENG Xue-qin ZHANG Ai-kui |
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| Institution: | (Institute of Earth Sciences, China University of Geosciences , Beij ing 100083) |
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| Abstract: | Few geological researches in Kayakedengtage area of East Kunlun Mountains have been carried out, and especially there has no Late Devonian intrusive rock been reported or recorded in the past. According to the LA-ICP-MS zircon U-Pb isotopic dating, this paper identifies the existence of Late Devonian granodiorite, forming in 380.52±0.92 Ma of Late Devonian. This discovery challenges the previous understanding that the mantle-derived magma underplating of East Kunlun Caledonian orogenic cycle occurred in the early Devonian （408 Ma） to middle Devonian （386 Ma）, instead, it is confirmed that the mantle-derived magma underplating continues to the late Devonian （380 Ma）, which lays a foundation for the refinement of the late Devonian tectonic background of the East Kunlun Qimantage Caledonian orogenic cycle. Late Devonian granodiorite in Kayakedengtage occurred in the mantle-derived magma underplating of later post-orogenic extension collapse of Qimantage Caledonian orogenic belt. |
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| Keywords: | granodiorites geochronology geological implication late Devonian Kayakedengrage east Kunlun |
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