Sedimentary Records of Triassic Megamonsoon in Upper Yangtze Area
Sedimentary Records of Triassic Megamonsoon in Upper Yangtze Area
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发表时间：
2010
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通讯作者：
Zhao An-kun
中科院分区：
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作者：
Zhao An-kun
欧美研究者的研究证实了大季风的存在。三叠纪特提斯大洋北缘的上扬子地区是否存在大季风及其影响值得关注。一系列沉积证据表明，上扬子地区受到三叠纪大季风的强烈影响，这主要体现在：1)下三叠统飞仙关组的各种变化；2)飞仙关组一段的风暴；3)晚三叠世卡尼期碳酸盐生产力危机；4)上三叠统须家河组古树轮清晰。上扬子地区沉积记录表明，早三叠世至晚三叠世卡尼期巨风最为强烈。本文认为，P/T界线大规模绝灭引起的盖亚效应和特提斯地区卡尼期发生的强烈构造活动是导致三叠纪巨风形成的主要因素。
The existence of Megamonsoon was proved by Euramerican researchers' researches.Whether there was Megamonsoon and how it influenced in Upper Yangtze area,the northern fringe of the Triassic Tethys Ocean,is worth of close attention.A serial of sedimentary evidences revealed upper Yangtze area was strongly affected by the Triassic Megamonsoon,which was mainly reflected in: 1)varves in the Lower Triassic Feixianguan Formation;2)tempestite in the first segment of Feixianguan Formation;3)Late Triassic Carnian carbonate productivity crisis and 4)clear tree ring of fossil wood in Upper Triassic Xujiahe Formation.The sedimentary records in Upper Yangtze Area showed that megamonsoon was most intense in the Early Triassic period and Late Triassic Carnian Time.It's believed in this paper that the Gaia effect caused by the mass extinction at P / T boundary and the strong tectonic activity occurring during Carnian time in Tethys Region were the dominant factors to induce the Triassic megamonsoon.