北京大学学报（自然科学版）2025，Vol.61Issue(4)：668-686,19.DOI:10.13209/j.0479-8023.2025.058
西西伯利亚盆地北部亚马尔-格达地区古构造地貌及构造活动过程
Paleogeomorphology and Tectonic Activity Processes in Yamal-Gyda Region of the Northern West Siberian Basin
摘要
Abstract
The northern West Siberian Basin developed tectonic activity during the Triassic period with the deve-lopment of rift systems and throughout the Mesozoic-Cenozoic era with the formation of numerous local tectonic uplifts.In view of the fact that there is no unified and clear understanding on the formation mechanisms of the geological features,this paper presents a detailed analysis of deep linear structures of the pre-Mesozoic basement,the tectonic evolution of sedimentary cover,the paleogeomorphology,and tectonic activity processes of Yamal-Gyda region.The results reveal that:1)Deep linear structures can be categorized into four groups of directions,NW,NE,nearly E-W and nearly N-S.The NW and NE linear structures are the structural responses of the folds,thrusts,reverse faults and strike-slip faults of the pre-Mesozoic basement linked to the Ural fold system.The nearly N-S lineaments are clearly identifiable normal faults that mark the western boundary of the Triassic rifting graben.2)Normal faults(stretching)and anticlines(compression)exhibit identical tectonic orientations.These structures developed sequ-entially,first through dextral strike-slip faulting in the NW direction and subsequently through sinistral strike-slip faulting in the NE direction.Anticlines formed under the influence of these dual strike-slip movements,with most normal faults developing during the dominant right-lateral phase.3)The initiation of most uplifts and faults occurred during the Jurassic period,followed by multiple episodes of reactivation of deep linear structures.These tectonic activities are closely linked to Late Cimmerian folding,the collision between the Eurasian Plate and the Indian Plate,as well as widespread regional extensional and rifting processes across the northern part of the Eurasian continent.4)The majority of uplifts are likely tied to differential vertical movements generated during the activation of deep linear structures.The NE and NNE-trending uplifts and lineaments correlate with folds,reverse faults,and thrust faults associated with the Urals-Novaya Zemlya fold belt,while NW-trending uplifts and lineaments correspond to the dextral strike-slip faults across the Eurasia continent.关键词
西西伯利亚盆地/构造活动/走滑断裂/古隆起/古构造地貌/构造变形Key words
West Siberian Basin/tectonic activity/strike-slip faults/paleo-uplift/paleogeomorphology/tectonic deformation引用本文复制引用
莫午零,计智锋,姜仁,张艺琼..西西伯利亚盆地北部亚马尔-格达地区古构造地貌及构造活动过程[J].北京大学学报（自然科学版）,2025,61(4):668-686,19.基金项目
国家科技重大专项(2025ZYGJCJ011)和中国石油国际勘探开发有限公司海外技术研发项目(25ZYGJCJ002)资助 （2025ZYGJCJ011）
