本文關(guān)鍵詞：東北地塊群:構(gòu)造演化與古大陸重建　出處：《吉林大學學報(地球科學版)》2016年04期 　論文類型：期刊論文

  更多相關(guān)文章： 東北地塊群 泛非期基底 古生界蓋層 縫合帶位置和時代 超大陸重建

【摘要】：東北地區(qū)位于西伯利亞板塊、華北板塊和太平洋板塊之間,為"中亞造山帶"的東段和太平洋構(gòu)造域的疊加部位,因此東北地塊群構(gòu)造屬性和背景的研究對深入探討二大構(gòu)造域的疊加與轉(zhuǎn)化背景具有重要的理論意義。東北地塊群從東到西可細分佳木斯—興凱、松遼、興安和額爾古納四大地塊,這些地塊具有相同的新元古代——泛非期變質(zhì)基底,而古生代沉積巖也存在一定的可比性,表明這些地塊存在相同或者相似的構(gòu)造演化背景。分割這些地塊的構(gòu)造邊界特征為:1)額爾古納與興安地塊的縫合帶為早古生代頭道橋—新林縫合帶,而非中生代德爾布干斷裂;2)興安地塊與松遼地塊之間的賀根山黑河縫合帶形成時代為晚石炭世(330~300 Ma),而非最近報道的中生代;3)古亞洲洋分布在東北陸塊群與華北板塊之間,沿西拉木倫—長春縫合帶閉合,時代為三疊紀;4)佳木斯—興凱地塊與松遼地塊之間的吉黑高壓帶形成于古亞洲構(gòu)造域與環(huán)太平洋構(gòu)造域轉(zhuǎn)換的關(guān)鍵時期(210~180 Ma);5)那丹哈達增生雜巖為中國境內(nèi)古太平洋板塊俯沖增生的唯一直接證據(jù),并記錄了晚三疊早白堊世古太平洋板塊向歐亞大陸俯沖增生的過程。在此基礎(chǔ)上,分析了東北地塊群發(fā)育的典型古生物和年代學標志,重建了東北地塊群從Gondwana大陸到Pangea大陸的位置與模型。
[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.
【作者單位】： 吉林大學地球科學學院;
【基金】：國家自然科學基金項目(41390441;41190075;41272241) 大學生創(chuàng)新項目(2016-06-07)~~
【分類號】：P542
【正文快照】： ，

本文編號：1403256