The Recognition of Late Devonian Granodiorite and Its Geological Implication in Kayakedengtage, East Kunlun Mountain, Qinghai-Tibet Plateau
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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（408 Ma）—中泥盆世（386 Ma）的认识，进而将幔源岩浆底侵作用一直延续至晚泥盆世380 Ma，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。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 /
- Kayakedengtage /
- east Kunlun
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