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引用本文:王国灿,张孟,张雄华,廖群安,王玮,田锦明,玄泽悠. 东天山北部古生代重大构造事件及其对中亚造山带演化的启示:基于1:5万板房沟幅和小柳沟幅地质调查新证据[J]. 中国地质, 2019, 46(5): 954-976.
WANG Guocan,ZHANG Meng,ZHANG Xionghua,LIAO Qun'an,WANG Wei,TIAN Jinming,XUAN Zeyou. Significant Paleozoic tectonic events in the northern part of the East Tianshan Mountains, Xinjiang and their implications for the evolution of CAOB: New evidence from 1: 50000 geological survey of Banfanggou and Xiaoliugou sheets[J]. Geology in China, 2019, 46(5): 954-976(in Chinese with English abstract).
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东天山北部古生代重大构造事件及其对中亚造山带演化的启示:基于1:5万板房沟幅和小柳沟幅地质调查新证据
王国灿1,2, 张孟2, 张雄华2, 廖群安2, 王玮3, 田锦明2, 玄泽悠1
1.中国地质大学(武汉)地质调查研究院, 湖北 武汉 430074;2.中国地质大学(武汉)地球科学学院全球大地构造研究中心, 湖北 武汉 430074;3.新疆维吾尔自治区地质调查院, 新疆 乌鲁木齐 830000
摘要:
本文基于新疆哈密地区1:5万板房沟幅和小柳沟幅区域地质调查新成果,对东天山北部古生代的重大构造事件以及演化历史进行了系统的梳理。基于下志留统与奥陶系之间角度不整合、下石炭统与泥盆系之间平行不整合以及上石炭统二道沟组与下伏岩系之间的角度不整合的确定,揭示奥陶纪与志留纪之交、泥盆纪与石炭纪之交以及晚石炭世期间存在几次重大构造事件。结合古生代不同时期沉积大地构造背景转换、岩浆活动构造环境转换以及构造变形格式转换的地质新纪录,提出奥陶纪与志留纪之交的造山事件为北部阿尔曼太洋闭合导致准噶尔-吐哈地块与阿尔泰地块碰撞的响应;泥盆纪与早石炭世之间的造陆构造事件可能是北部卡拉麦里洋盆初始汇拢碰撞的响应,其平行不整合以及下伏的志留纪-泥盆纪较稳定环境的沉积序列预示着介于卡拉麦里洋盆与南部北天山洋盆之间的准噶尔-吐哈地块为古亚洲洋盆体系中相对刚性的稳定陆块区,研究区作为准噶尔-吐哈地块的北部被动陆缘受卡拉麦里洋盆汇聚的影响较小;晚石炭世的造山事件则表现为响应卡拉麦里洋盆闭合后周缘前陆盆地的演化,是早石炭世沿卡拉麦里缝合带发生陆块碰撞以来挤压构造作用峰期的产物,其奠定了东天山北部北西-南东向构造基本格局。本文还重新界定莫钦乌拉断裂为北天山构造带(准噶尔-吐哈地块)与东准噶尔构造带的构造-地层分区界线,推断其为卡拉麦里缝合带向南东的延伸,并讨论了早石炭世受控不同构造体制的沉积和岩浆纪录的空间差异性,认为早石炭世北部莫钦乌拉山区域为与北侧卡拉麦里洋盆闭合后周缘挤压前陆盆地的发育过程,而南部博格达-哈尔里克山则总体呈现为响应南侧北天山洋盆闭合后的碰撞后伸展裂谷发育过程。
关键词:  东天山  古生代  构造事件  构造演化  1:5万板房沟幅和小柳沟幅  地质调查工程
DOI:10.12029/gc20190502
分类号:P54
基金项目:中国地质调查局基础地质调查项目(DD20160060、DD20179607)资助。
Significant Paleozoic tectonic events in the northern part of the East Tianshan Mountains, Xinjiang and their implications for the evolution of CAOB: New evidence from 1: 50000 geological survey of Banfanggou and Xiaoliugou sheets
WANG Guocan1,2, ZHANG Meng2, ZHANG Xionghua2, LIAO Qun'an2, WANG Wei3, TIAN Jinming2, XUAN Zeyou1
1.Institute of Geological Survey, China University of Geosciences, Wuhan 430074, Hubei, China;2.Center for Global Tectonics, School of Earth Sciences, China University of Geosciences, Wuhan 430074, Hubei, China;3.Xinjiang Institute of Geological Survey, Urumqi 830000, Xinjiang, China
Abstract:
Based on the new results of 1:50,000 geological survey of Banfanggou and Xiaoliugou sheets in Hami area, Xinjiang, this paper systematically reviewed the major tectonic events and evolutionary history during Paleozoic in the northern part of the East Tianshan Mountains. There existed three major tectonic events between Ordovician and Early Silurian, between Devonian and Early Carboniferous and in the Late Carboniferous, respectively, as shown by the newly discovered angular unconformity or disconformity. Combined with a series of new records of sedimentation, magmatism and deformation reflecting tectonic transformation, the links between these tectonic events and the evolution of the Central Asian Orogenic Belt (CAOB) are discussed. It is suggested that the orogenic event that occurred at the turning time from Ordovician to Silurian was the response to collision between the Junggar-Tuha terrane and the Altay terrane following the closure of the Armantai oceanic basin. The disconformity between Devonian and Lower Carboniferous shows an epeirogenic event, probably in response to the initial closure of the Kalamaili oceanic basin to the north. This disconformity and underlying Silurian-Devonian deposits in relatively stable tectonic environment also show that the Junggar-Tuha terrane between the Kalamaili oceanic basin and the North Tianshan oceanic basin was a relatively rigid and stable continental block in the Paleo-Asian Ocean system. The study area, as the northern passive continental margin of the Junggar-Tuha block, was less affected by the convergence of the Kalamaili oceanic basin. The orogenic event in the late Carboniferous was the reflection of peak orogenesis in response to the evolution of the peripheral foreland basin after the arccontinental collision that occurred along the Kalamaili suture zone during late Devonian-early Carboniferous period. This event established the basic NW-SE trending structural framework in the East Tianshan Mountains. The authors also redefined the Moqinwula fault as the southeastern extension of the Kalamaili suture zone, the tectonic-stratigraphic boundary between the North Tianshan Mountains (or Junggar-Tuha block) and the East Junggar terranes, and discussed the spatial differences of tectonic regime in the early Carboniferous. Based on the records of sedimentation and magma of the early Carboniferous, the authors hold that a peripheral foreland basin, which was related to the closure of the Kalamaili oceanic basin, was developed in the Moqinwula Mountain, whereas a rift basin was developed in the Bogda-Harrick Mountain, which was in response to the post-collision extension related to the closure of the North Tianshan Ocean.
Key words:  East Tianshan Mountains  Paleozoic  tectonic events  tectonic evolution  1:50000 geological survey of Banfanggou and Xiaoliugou sheets  geological survey engineering