摘要
博格达地层小区与其相邻的依连哈比尔尕地层小区分区界线久存争议,与此对应的两构造单元界线亦有所争议。确定两地层小区各岩石地层单元之间的接触关系是回答前述科学问题的关键。本研究于博格达山南新发现并确立的博格达南缘断裂规模宏大、延伸稳定,属左行走滑断裂,南北两侧分别隐伏于吐哈盆地及准噶尔盆地。详细的野外地质调查工作并综合前人研究成果完成精细化对比后发现,断裂南北盘地质体具有不同的变形史、沉积史及岩浆活动史。碎屑锆石指示断裂两盘晚石炭世同期陆源碎屑岩具有显著不同的物源组成和地质背景,暗示两套上石炭统分属两个沉积盆地,表明博格达南缘断裂具有分割地层小区的基本属性。博格达南缘断裂的确立,有效地限定了博格达地层小区与依连哈比尔尕地层小区的边界,为分区地层格架研究提供了新资料。
The boundary between the Bogda and the Yilianhabierga stratigraphic minor-regions,has been in dispute for a long time,and the corresponding boundary of the two tectonic units have also been disputed.Determining the contact relationships between the lithostratigraphic units in these two stratigraphic minorregion is the key to answering the aforementioned scientific questions.The southern margin fault of Bogda has discovered and established in Bogda Mountain area in this study,its a large-scale and stable extension,belonging to the levitra strike-slip fault,which was hidden in the Tuha basin and Junggar basin on the south and north sides,respectively.Detailed field geological investigations and refined comparisons of previous research results show that the geologic entities of the northern and southern plate of the fault have different deformation histories,sedimentary histories,and histories of magmatic activity.Detrital zircons indicates different source compositions and geological background of contemporaneous terrigenous clastic rocks in late Carboniferous on both sides of the fault,implying that the two sets of upper Carboniferous units belong to two sedimentary basins.It is shown that the southern margin fault of Bogda has the basic property of dividing the stratigraphic minor-region.The establishment of the southern margin fault of Bogda effectively defines the boundary between Bogda and the Yilianhabierga stratigraphic minor-regions,new information is provided for the research of zonal stratigraphic grids.
作者
张坚烨
李永军
郑孟林
王韬
李伟
王芊
ZHANG Jianye;LI Yongjun;ZHENG Menglin;WANG Tao;LI Wei;WANG Qian(Changan University,School of Earth Science and Resources,Xian,Shaanxi 710054,China;Key Laboratory for the study of Focused Magmatism and Giant Ore Deposits,MNR,Xian,Shaanxi 710054,China;Xinjiang Oilfield Company,PetroChina,Research Institute of Exploration and Development,Karamay,Xinjiang 834000,China)
出处
《地质学报》
北大核心
2025年第8期2581-2596,共16页
Acta Geologica Sinica
基金
国家科技重大专项“新疆北部深层区域构造格架、沉积演化与有利区带评价”(编号2017ZX05008-006-003-001)
国家重点研发计划深地资源勘查开采重点专项(编号2018YFC060400)联合资助的成果。
关键词
博格达南缘断裂
地层小区分区断裂
岩石组合
新疆博格达构造带
southern margin fault of Bogda
zonal disintegration of stratigraphic minor-region
rock assemblage
Bogda tectonic belt in Xinjiang
