摘要
中国东北的那丹哈达岭地区位于中亚造山带最东部,它的中—新生代热演化史是认识陆内造山活动的关键,但该地区相关研究比较薄弱,其中—新生代的热演化史缺乏有效的约束。因此本文应用磷灰石裂变径迹、锆石和磷灰石(U-Th)/He等多种低温热年代学方法,对东北那丹哈达岭地区的侵入岩开展构造热演化历史研究。热年代学数据和热史模拟结果表明,该地区存在早白垩世晚期—晚白垩世(110~80 Ma)、古新世—始新世(60~40 Ma)两期快速冷却事件,其冷却速率分别为3.42~4.81℃/Ma和1.43~1.83℃/Ma。结合区域构造和应力分析,我们认为两期冷却事件均受构造活动控制。第一期快速冷却事件是古太平洋板块北西向俯冲引发的构造叠加到鄂霍特莫茨克地块并与东亚大陆边缘碰撞引起;而第二期快速冷却事件是古太平洋俯冲的板片后撤使东亚陆缘处于伸展环境,造成东北大面积的剥露作用引起。这次研究增强了对东亚陆缘中新生代构造-热演化历史的认识,对于理解大陆内部造山带的构造变形过程与机理具有重要意义。
The Nadanhada region in northeast China is located in the easternmost part of the Central Asian orogenic belt. Its Late Mesozoic-Cenozoic tectono-thermal evolution history is key to understand the orogenic activity of the continental margin. However, previous studies in this area are limited, and the Mesozoic-Cenozoic thermal evolution history lacks effective constraints. Hence we take Nadanhada region as the main research area in this study and apply multiple low temperature thermochronological methods including apatite fission track, zircon, and apatite(U-Th)/He to study the tectonic thermal evolution history of the Nadanhada region. The thermochronological datas and thermal history modeling results reveal that there are two rapid cooling events in the late early Cretaceous to late Cretaceous(110~80 Ma) and Paleocene to Eocene(60~40 Ma), with cooling rates of 3.42~4.81 ℃/Ma and 1.43~1.83 ℃/Ma, respectively. Combined with the history of regional tectonic setting and the geological data, it is concluded that the two cooling processes are controlled by Pacific subduction. The late Cretaceous rapid cooling was caused by a change in the subduction direction of the Pacific plate, and the collision between the Okhotsk block and the East Asian continental margin. The Eocene rapid cooling was mainly caused by the roll-back of the subducting Pacific slab, which placed the East Asian continental margin in an extensional environment, resulting in the exhumation and the following cooling events at most areas in Northeast China. This study enhances understanding of the Mesozoic-Cenozoic tectono-thermal evolution history of the East Asian continental margin, and it is of great significance to understand the process and mechanism of tectonic deformation in intracontinental orogenic belt.
作者
杨雪叶
尹继元
肖文交
陈文
陈岳龙
孙敬博
张斌
王雅美
YANG Xueye;YIN Jiyuan;XIAO Wenjiao;CHEN Wen;CHEN Yuelong;SUN Jingbo;ZHANG Bin;WANG Yamei(Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources,Institute of Geology,Chinese Academy of Geological Sciences,Beijing100037 China;School of Earth Sciences and Resources,China University of Geosciences,Beijing100083,China;Xinjiang Research Center for Mineral Resources,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi,Xijiang830011,China;State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing100029,China)
出处
《地质学报》
EI
CAS
CSCD
北大核心
2021年第12期3660-3675,共16页
Acta Geologica Sinica
基金
国家重点研发计划项目(编号2017YFC0601301)
中国地质调查项目(编号DD20190001和DD20190004)
自然资源部深地动力学重点实验室开放课题基金(编号J1901-5)
国家自然科学基金项目(编号41873060和41830216)
IGCP 662联合资助的成果。
关键词
中国东北
那丹哈达岭
低温热年代学
古太平洋俯冲
冷却剥露历史
NE China
Nadanhada
low-temperature thermochronology
paleo-Pacific subduction
cooling and exhumation history
