塔里木盆地西北缘新元古代震积岩的发现及其地质意义  

Discovery of Neoproterozoic seismites in the northwestern margin of the Tarim Basin and its geological significance

作　　者：师骏[1] 黄伟康 尚江伟 章凤奇[2,3] 吕惠贤[1] 程晓敢[2,3] 黎立[1] 林秀斌[2,3] 雷鸣[1] 陈汉林[2,3] Shi Jun;Huang Weikang;Shang Jiangwei;Zhang Fengqi;LüHuixian;Cheng Xiaogan;Li Li;Lin Xiubin;Lei Ming;Chen Hanlin(Research Institute of Exploration and Development,Tarim Oilfield Company,Korla,Xinjiang 841000;Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province,School of Earth Sciences,Zhejiang University,Hangzhou 310027;Structural Research Center of Oil&Gas Bearing Basin of Ministry of Education,Hangzhou 310027 More Information)

机构地区：[1]中国石油塔里木油田分公司勘探开发研究院,新疆库尔勒841000 [2]浙江大学地球科学学院,浙江省地学大数据与地球深部资源重点实验室,杭州310012 [3]教育部含油气盆地构造研究中心,杭州310012

出　　处：《地质科学》2021年第3期758-769,共12页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家自然科学基金面上项目(编号:42072233)资助。

摘　　要：震积岩是地层中记录古地震事件的关键岩石记录,通过震积岩的识别和发育序列的研究有助于认识盆地形成的构造背景和区域大地构造过程。在塔里木盆地西北缘的乌什南部地区新元古界中识别出臼齿构造、微同沉积断裂和液化卷曲变形等古地震引起的软沉积变形构造,发育典型的震积岩(震裂岩和震褶岩)以及震浊积岩、冰碛岩和薄层状钙质泥岩等沉积单元,并在南华系上部形成了深水浊流沉积—冰水混积—地震活动和背景沉积—地震活动等两期震积作用序列。塔里木西北缘南华系震积岩与同时期正断层紧密伴生,共同指示区域构造伸展背景,可能与新元古代罗迪尼亚超大陆裂解、大规模裂谷作用有关。Seismite is the key rock record to record palaeo-seismic events in the strata. The identification and analysis of seismite can help us to understand the tectonic background of sedimentary basin. In the southern Wushen area of NW Tarim Basin, soft sedimentary deformation structures caused by palaeo-earthquakes, such as molar tooth structure,microsynsedimentary fault and liquefaction crimp-deformation, are recognized in the Neoproterozoic in the southern Wushi area in the northwestern margin of the Tarim Basin.Typical sedimentary units, such as seismite(seismicity fissure and seismicity fold), seismicity turbidite, moraine and thin-bedded calcous mudstone, are developed. In the upper part of Nanhua System, there are two periods of seismicity sequence, namely, deep-water turbidity sedimentation, ice-water mixed deposition and seismicity, and background sedimentation and seismicity. The Nanhua seismites are closely associated with contemporaneous sedimentary normal faults in the northwestern margin of Tarim Basin, indicating the regional tectonic extensional setting, which was possibly related to the breakup of the Neoproterozoic Rodinia supercontinent and large-scale rifting.

关 键 词：塔里木盆地 新元古代 震积岩 裂谷作用 超大陆裂解 

分 类 号：P588.2[天文地球—岩石学]