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中朝地块与扬子地块碰撞的时限与方式—长江中下游地区震旦纪一侏罗纪沉积环
  修订日期:2000-06-30  点此下载全文
引用本文:李锦铁.2001.中朝地块与扬子地块碰撞的时限与方式—长江中下游地区震旦纪一侏罗纪沉积环[J].地质学报,75(1):25-34.
.2001.Pattern and Time of the Collision Between the Sino-Korean and Yangtze Blocks: Evolution of the Sinian-Jurassic Sedimentary Settings in the Middle-Lower Reaches of the Yangtze River[J].Acta Geologica Sinica,75(1):25-34.
DOI:
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李锦铁
地质科学院地质研究所,北京100037
基金项目:国土资源部科研项目,9501102,
中文摘要:古陆碰撞继之为海洋盆地关闭、山脉隆起和前陆盆地巨厚碎屑岩系的堆积。造山带的前陆地区,前身是被动陆,构造上位于较低的部位,其地质记录可以保存得相对完整。长江中下游地区,是大别造山带的前陆构造带。通过对那里沉积物形成环境,特别是物源区的分析研究,识别出震旦系至下三叠统被动陆缘沉积岩系和中三叠统至中侏罗统前陆盆地沉积岩系,据此推测大别造山带碰撞造山作用发生在中三叠世。早三叠世被动陆缘岩系和前陆盆地堆积物的空间分布,揭示出中朝与扬子两个地板之间的碰撞方式,在长江中下游地区从东到西基本是同时的。
中文关键词:大别造山带 前陆盆地 扬子地块 中三叠世 震旦纪
 
Pattern and Time of the Collision Between the Sino-Korean and Yangtze Blocks: Evolution of the Sinian-Jurassic Sedimentary Settings in the Middle-Lower Reaches of the Yangtze River
LI Jinyi
Abstract:Closure of oceanic basins, uplift of mountain ranges, and accumulation of thick terrigenous clastic sediments in the foreland basin resulted from collision between continental margins. Relatively complete geological records can be preserved in the foreland areas of orogenic belt, which were once a passive continental margin and located at relatively low structural positions. The middle and lower reaches of the Yangtze River are the foreland tectonic belt of the Dabieshan orogen. Through investigation and analyses of sedimentary settings especially the provenience of sediments, the Sinian-Jurassic sedimentary strata exposed in the study area have been recognized as Sinian-Lower Triassic passive continental marginal sequences and the Middle Triassic-Middle Jurassic foreland basin sequences. And then, it is inferred that the collisional orogeny in the Dabieshan orogen took place in the Middle Triassic. The spatial distribution of the Lower Triassic passive continental marginal sequence and foreland basin sequences demonstrates the collisional pattern of the Sino-Korean and Yangtze blocks, indicating that the collision was basically simultaneous from east to west in the middle-lower reaches of the Yangtze River.
keywords:foreland basin of the Dabieshan orogen,passive margin of the Yangtze block,Middle Triassic collision, collisional pattern,
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