东北地块群:构造演化与古大陆重建

发布时间：2018-01-10 01:10

  本文关键词：东北地块群:构造演化与古大陆重建　出处：《吉林大学学报(地球科学版)》2016年04期 　论文类型：期刊论文

  更多相关文章： 东北地块群 泛非期基底 古生界盖层 缝合带位置和时代 超大陆重建

【摘要】：东北地区位于西伯利亚板块、华北板块和太平洋板块之间,为"中亚造山带"的东段和太平洋构造域的叠加部位,因此东北地块群构造属性和背景的研究对深入探讨二大构造域的叠加与转化背景具有重要的理论意义。东北地块群从东到西可细分佳木斯—兴凯、松辽、兴安和额尔古纳四大地块,这些地块具有相同的新元古代——泛非期变质基底,而古生代沉积岩也存在一定的可比性,表明这些地块存在相同或者相似的构造演化背景。分割这些地块的构造边界特征为:1)额尔古纳与兴安地块的缝合带为早古生代头道桥—新林缝合带,而非中生代德尔布干断裂;2)兴安地块与松辽地块之间的贺根山黑河缝合带形成时代为晚石炭世(330~300 Ma),而非最近报道的中生代;3)古亚洲洋分布在东北陆块群与华北板块之间,沿西拉木伦—长春缝合带闭合,时代为三叠纪;4)佳木斯—兴凯地块与松辽地块之间的吉黑高压带形成于古亚洲构造域与环太平洋构造域转换的关键时期(210~180 Ma);5)那丹哈达增生杂岩为中国境内古太平洋板块俯冲增生的唯一直接证据,并记录了晚三叠早白垩世古太平洋板块向欧亚大陆俯冲增生的过程。在此基础上,分析了东北地块群发育的典型古生物和年代学标志,重建了东北地块群从Gondwana大陆到Pangea大陆的位置与模型。
[Abstract]:Northeast China is located between the Siberian plate, North China plate and Pacific plate, which is the superposition of the eastern part of the Central Asian orogenic belt and the Pacific tectonic domain. Therefore, the study of the tectonic attributes and background of the Northeast Block Group has important theoretical significance for further discussing the superposition and transformation background of the two tectonic domains. The Northeast Block Group can be subdivided from east to west into Jiamusi Xingkai and Songliao. The Xingan and Erguna blocks have the same Neoproterozoic Pan-African metamorphic basement and the Paleozoic sedimentary rocks are comparable to each other. The tectonic boundary of these blocks is 1: 1) the suture zone between Erguna and Xingan massif is the early Paleozoic Toutaoqiao-Xinlin suture zone. Not Mesozoic Delbugan fault; 2) the Hegenshan Heihe suture zone between Xingan block and Songliao massif was formed in the late Carboniferous (300 Ma), not in the Mesozoic as recently reported; 3) the paleo-Asian ocean is distributed between the northeast continental block group and the North China plate, and is closed along the Xilamulun-Changchun suture zone, and the age is Triassic; 4) the Jiamusi Xingkai block and Songliao massif were formed in the key period of the transformation between the Paleo-Asian tectonic domain and the circum-Pacific tectonic domain. 5) the Nathanhada accretive complex is the only direct evidence of the subduction and accretion of the paleo-Pacific plate in China, and records the process of the subduction of the paleo-Pacific plate to the Eurasian continent in the late Triassic and early Cretaceous. The typical paleontological and chronological markers for the development of the Northeast Block Group are analyzed and the location and model of the Northeast Block Group from the Gondwana continent to the Pangea continent are reconstructed.
【作者单位】： 吉林大学地球科学学院;
【基金】：国家自然科学基金项目(41390441;41190075;41272241) 大学生创新项目(2016-06-07)~~
【分类号】：P542
【正文快照】： ，

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