Process of Rifting and Collision along Plate Margins of the Qinling Orogenic Belt and Its Geodynamics

The Qinling erogenic belt underwent complicated processes of rifting and collision, as shown by the coexistence of (1) ocean extension and plate margin rifting and (2) subduction of the frontal oceanic crust and extension of the rear plate margin. These resulted in a basin-mountain framework characterized by the coexistence of plates separated by the ocean basin and continental blocks demarcated by the rifting sea trough in the marginal region and the coexistence of subduction orogeny and ocean extension. Generally speaking, the plate marginal area between the North China plate and Yangtze plate continually rifted from north to south and the rifted micro-plates continually accreted northwards. This especial orogenic process was probably controlled by two events of deep mantle geody-namic adjustment and mantle plume activities, which occurred in the Shangdan suture belt and Mianlue suture belt from north to south respectively.     

Analysis of the ore-controlling role of Guojiadian mantle branch structure, Northwest Shandong Peninsula, China

Metallogenesis in the gold ore-concentrated zone of Northwest Shandong Peninsula is closely related to deep processes.The region in the eastern part of North China entered into the stage of mantle plume evolution during the Yanshanian movement,following the long-time stage of stable platform evolution during Paleozoic time.At that time,the ore-concentrated zone of Northwest Shandong Peninsula just entered into the development-evolution stage of the Laiyang sub-mantle plume and the Guojiadian mantle branch structure in its periphery.The core-mantle-source gold was present in the gas-liquid form,and it migrated through mantle plume→sub-mantle plume→mantle branch structure→favorable tectonic expansion zone to the favorable loci of the mantle branch structure,where gold was deposited as ores,thereafter constituting a series of large-to medium-sized gold deposits distributed around the Guojiadian mantle branch structure.This study also dealt with the Jiaojia fault as the main detachment(fault altered rock) belt on the northwestern margin of the mantle branch structure and also presented a basic cognition about the fact that the Sanshandao fault as the listric fault on the hanging wall of the detachment belt.Furthermore,on this basis,this study also pointed out the orientation for further ore prospecting in this region.     

Surface Processes Driving Intracontinental Basin Subsidence in the Context of India–Eurasia Collision: Evidence from Flexural Subsidence Modeling of the Cenozoic Southern Tarim Basin along the West Kunlun Foreland, NW Tibetan Plateau

The India–Eurasia collision has produced a number of Cenozoic deep intracontinental basins, which bear important information for revealing the far-afield responses to the remote collision. Despite their significance, their subsiding mechanism remains the subject of debate, with end-member models attributing it to either orogenic or sedimentary load. In this study, we conduct flexural subsidence modeling with a two-dimensional finite elastic plate model on the Hotan–Mazatagh section along the southern Tarim Basin, which defines a key region in the foreland of the West Kunlun Orogen, along the NW margin of the Tibetan Plateau. The modeling results indicate that the orogenic load of West Kunlun triggers the southern Tarim Basin to subside by up to less than ~6 km, with its impact weakening towards the basin interiors until ~230 km north from the Karakax fault. The sedimentary load, consisting of Cenozoic strata, forces the basin to subside by ~2 to ~7 km. In combination with the retreat of the proto-Paratethys Sea and the paleogeographic reorganization of the Tarim Basin, we propose that surface processes, in particular a shift from an exorheic to an endorheic drainage system associated with the consequent thick sedimentary load, played a decisive role in forming deep intracontinental basins in the context of the India–Eurasia collision.     

Jurassic Tectonics of North China: A Synthetic View

This paper gives a synthetic view on the Jurassic tectonics of North China, with an attempt to propose a framework for the stepwise tectonic evolution history. Jurassic sedimentation, deformation and magmatism in North China have been divided into three stages. The earliest Jurassic is marked by a period of magmatism quiescence （in 205-190 Ma） and regional uplift, which are considered to be the continuation of the “Indosinian movement” characterized by continent-continent collision between the North and South China blocks. The Early to Middle Jurassic （in 190-170 Ma） was predominated by weak lithospheric extension expressed by mantle-derived plutonism and volcanism along the Yanshan belt and alongside the Tan-Lu fault zone, normal faulting and graben formation along the Yinshan- Yanshan tectonic belt, depression and resuming of coal-bearing sedimentation in vast regions of the North China block （NCB）. The Middle to Late Jurassic stage started at 165y.5 Ma and ended up before 136 Ma; it was dominated by intensive intraplate deformation resulting from multi-directional compressions. Two major deformation events have been identified. One is marked by stratigraphic unconformity beneath the thick Upper Jurassic molasic series in the foreland zones of the western Ordos thrust-fold belt and along the Yinshan-Yanshan belt; it was predated 160 Ma. The other one is indicated by stratigraphic unconformity at the base of the Lower Cretaceous and predated 135 Ma. During this last stage, two latitudinal tectonic belts, the Yinshan-Yanshan belt in the north and the Qinling-Dabie belt in the south, and the western margin of the Ordos basin were all activated by thrusting; the NCB itself was deformed by the NE to NNE-trending structural system involving thrusting, associated folding and sinistral strike-slip faulting, which were spatially partitioned. Foliated S-type granitic plutons aged 160-150 Ma were massively emplaced in the Jiao-Liao massif east of the Tan-Lu fault zone and indicate important crustal thicken     

Cenozoic Exhumation History of the East Kunlun Orogenic Belt Constrained by Apatite Fission‐Track Thermochronology

正Objective The East Kunlun Orogenic belt constitutes the first marked change in the topographic reliefs north of the Qinghai-Tibet Plateau.The Cenozoic tectonic evolution of this orogenic belt is crucial for understanding the remote deformational effects of the Eurasian plate collision and the migration track at the northern margin of the plateau.However,when and how the uplift occurred remains     

RELATIONSHIP BETWEEN GOLD MINERALIZATION AND STRIKE-SLIP FAULTING IN WULONGGOU MINING DISTRICT, EASTERN KUNLUN MOUNTAINS

1. IntToductionThe Kunlun Mis., a Mesozoic orogene that has undergone multiphase tectonic activities, isdivided into the Eastern Kunlun Mis. and the Western Kunlun Mis. by the southwesternpaf t of the Altun strike-slip fault zone. In the Eastern Kunlun Mis., there are three largefault belts named as the north fault belt, the celltfal fault belt and the south fault belt.These three belts are roughly parallel to each other and extend along west-east orientation.The blocks in various belts …     

Ore-forming Conditions and Prospecting in the West Kunlun Area,Xinjiang, China

The West Kunlun ore-forming belt is located between the northwestern Qinghai-Tibet Plateau and southwestern Tarim Basin. It situated between the Paleo-Asian Tectonic Domain and Tethyan Tectonic Domain. It is an important component of the giant tectonic belt in central China (the Kunlun-Qilian-Qinling Tectonic Belt or the Central Orogenic Belt). Many known ore-forming belts such as the Kunlun-Qilian Qinling ore-forming zone, Sanjiang (or Three river) ore-forming zone, Central Asian ore-forming zone, etc. pass through the West Kunlun area. Three ore-forming zones and seven ore-forming subzones were classified, and eighteen mineralization areas were marked. It is indicated that the West Kunlun area is one of the most favorable region for finding out large and superlarge ore deposits.     

Geochemistry of the Cenozoic Potassic Volcanic Rocks in the West Kunlun Mountains and Constraints on Their Sources

The geochemical characteristics of the Cenozoic volcanic rocks from the north Pulu, east Pulu and Dahongliutan regions in the west Kunlun Mountains are somewhat similar as a whole. However, the volcanic rocks from the Dahongliutan region in the south belt are geochemically distinguished from those in the Pulu region (including the north and east Pulu) of the north belt. The volcanic rocks of the Dahongliutan region are characterized by relatively low TiO2 abundance, but more enrichment in alkali, much more enrichment in light rare earth elements and large ion lithosphile elements than those from the Pulu region. Compared with the Pulu region, volcanic rocks from the Dahongliutan region have relatively low 87Sr/86Sr ratios, and high εNd, 207Pb/204Pb and 208Pb/204Pb. Their trace elements and isotopic data suggest that they were derived from lithospheric mantle, consisting of biotite- and hornblende-bearing garnet lherzolite, which had undertaken metasomatism and enrichment. On the primitive mantle-normali     

Zircon U-Pb Chronology and Whole-rock Sr-Nd Isotope Compositions of Granite Porphyry in the Kaladaban Area of the Northern Altyn

正Objective The Altyn Tagh marks the northern margin of the Qinghai-Tibet Plateau and lies between the Tarim block to the north and the Qaidam block,Qilian Orogen,and Kunlun orogenic belt to the south.The Altyn Tagh region contains ophiolite,high-to ultrahigh-pressure metamorphic rocks,and igneous rocks.Previous research has virified the occurrence of continental rifting,subduction,slab roll-back,and collision between the Tarim block and Proto-Tethys oceanic plate.Moreover,Kaladaban volcanic rocks are mainly distributed in the north Altyn region.Studies of the magmatic evolution of this region have proposed that Altyn oceanic plate was subducted during the Ordovician (Han et al.,2012;Wang et al.,2017).However,the specific timing and other     

Accelerated Exhumation During the Cenozoic in the Dabie Mountains: Evidence from Fission-Track Ages

Zircon and apatite fission-track dating indicates that the exhumation of the Dabie Mountains tended to be accelerated in the Cenozoic and that the exhumation of the eastern Dabie Mountains was more and more intense from south to north, which is in accordance with the more and more intense dissection from south to north, as is reflected by the modern geomorphologic features of the Dabie Mountains. The accelerated exhumation during the Cenozoic was related to the high elevation of the Dabie Mountains resulting from Late Cretaceous-Palaeogene detachment faulting and subsequent fault-block uplift and subsidence. The average elevation at that time was at least about 660 m higher than that at the present. The intense exhumation lagged behind intense uplift.     

西昆仑-塔里木盆地盆-山结合带的中、新生代变形构造及其动力学

西昆仑—塔里木盆地盆-山结合带可划分为西昆仑北带和塔里木地块南缘拗陷带(塔南拗陷带)两个构造单元,后者由塔西南拗陷带和塔东南断陷带两部分组成。西昆北带分别以库地—喀什塔什断裂和西昆北冲断裂与西昆中带和塔里木地块南缘拗陷带相隔。盆-山构造经历了长期、叠次的形成、演化过程,但不同时期、不同层次的变形构造具有极大的统一性,总体表现为以西昆中断裂(其主体为库地—喀什塔什断裂)为根带,以北向逆冲扩展作用为主导,向北至塔南拗陷带腹部,逐渐转化为以垂直向上的构造伸展作用为主导。塔南拗陷带的逆冲断裂与具强烈深层流变组构的西昆北逆冲断裂属统一地球动力学系统中不同构造层次的成分,前者是后者向浅层脆性应变域扩展的产物。导致盆-山构造形成的驱动力来自昆仑构造带以南的持续、强烈的北向逆冲扩展作用,至少在塔南拗陷带的前早更新统地层分布区不存在塔里木地块自北向南俯冲的直接证据。西昆仑—塔里木盆地南缘的造盆、造山作用过程可简单地归纳为三个形成演化阶段:晚侏罗世—早白垩世的快速隆升和快速拗陷(沉降)期、晚白垩世—古近纪的深层拆离-缓慢隆升和均匀拗陷(沉降)期和新近纪至今的挤压-急剧隆升和强烈拗陷(沉降)期。造盆、造山作用的动力学过程表明,中—上新世是造盆造山作用机制发生重大转折时期,早更新世末的构造运动基本上奠定了西昆仑—塔里木盆地南缘的盆-山构造格架。     

塔里木盆地构造格架和构造应力场分析

以区域构造背景为基础,分析塔里木盆地的基本构造格架是本文的主要宗旨。塔里木盆地中部存在一规模较大的近于E-W向的构造带,谓中塔里木构造带或中塔里木断裂带,平面上它大致和塔里木中央隆起带相对应,东延,和阿尔金造山复合体的一组规模较大的、近于直立的E-W向韧性剪切带和断裂带相连,西延,插入西昆仑造山带和南天山造山带的结合部位。在剖面上具有背冲式(断背状)断裂组合,其形成始于早古生代,强烈活动期在三叠纪后。断裂带具有逆冲、走滑和垂向挤出性质,是目前塔里木盆地的主要含油带。中塔里木断裂带和塔中隆起带属于同一动力学系统中不同构造阶段的产物,在空间上是互为一体的,在早古生代为一强烈坳陷带,晚古生代以后逐渐转化为隆起带。大致位于北纬39°30'~40°的E-W向高正磁异常带,为一以基性麻粒岩为代表的结晶基底、基性岩墙和花岗质类岩石,并叠加晚元古-早古生代活动陆缘岩浆弧的大型东西向构造杂岩带。中塔里木断裂带(塔中隆起带)以南至塔南前陆盆地的塔南地区,以E-W向构造岩浆岩带上叠NEE向断裂构造(断隆和断凹)为基本特征,其断裂组合完全可以与南阿尔金断裂以南的南阿尔金地体的断裂组合相类比。中塔里木断裂带以北至塔北前陆盆地的塔北地区以长期坳陷为特征。西昆仑-塔里木盆地盆山结合带表现为西昆仑山体的北向逆冲推覆和山前带的强烈挤压及塔南前陆盆地的急剧沉降,而西天山-塔里木盆地盆山结合带则表现为由于塔里木地块向天山复合造山体的强烈北向俯冲导致的南天山的南向逆冲推覆和塔北(前陆盆地后的)隆起。塔里木盆地处于南北两侧向盆地挤压、东侧左旋走滑和西侧右旋走滑的复杂构造应力状态,塔里木盆地现今构造格局的形成基本上是上述4类不同性质的构造应力场对先存的E-W向构造经多次强烈改造、叠加的结果。     

塔里木盆地西南缘盆山结合带东段逆冲体系的形成及演化过程

塔西南盆山结合带位于青藏高原与塔里木盆地的结合部位,以发育逆冲推覆构造为主要变形特征,是研究青藏高原与塔里木关系的理想对象,也是塔里木油气成藏的重要潜力区。本研究主要通过野外考察、卫星图片解译以及重点地震剖面解释,对塔西南盆山结合带东段和田地区逆冲体系的结构及变形特征进行了分析。并且在前人研究基础上,阐述了塔西南盆山结合带东段逆冲体系的形成时限。我们认为塔西南盆山结合带东段逆冲体系由几个逆冲岩席组成,这些逆冲岩席皆形成在中新世之后,并且形成时间由南到北逐渐变新。我们采用了平衡剖面恢复手段对塔西南盆山结合带东段的变形程度及演化过程进行推理。指出塔西南盆山结合带东段新生代上地壳缩短率为36%~38%,且主要发生在中新世以来。塔西南盆山结合带东段逆冲体系的形成是新生代印度亚洲两大板块碰撞事件远程效应产生的结果。     

塔里木盆地东南缘新生代构造变形特征研究

塔里木盆地东南缘新生代变形特征研究对探讨阿尔金构造带新生代的活动特征及阿尔金构造带与西昆仑构造带的相互作用具有重要意义。本文在野外地质调查的基础上,结合地球物理和沉积学资料,探讨了塔里木盆地东南缘的新生代变形及演化特征。塔里木盆地东南缘新生代构造变形受西昆仑构造带、阿尔金构造带和车尔臣断裂带的控制,且变形由西向东减弱。西南部的构造样式主要表现为受西昆仑向北冲断作用控制的冲断构造;东南部为受阿尔金断层走滑作用控制的走滑-冲断构造;而北部则为受车尔臣断层走滑作用控制的基底卷入走滑-冲断构造。中新世,盆地东南缘受西昆仑构造带大规模的冲断活动影响,导致民丰山前盆地挠曲沉降和冲断层发育,而车尔臣断裂仅有微弱活动;上新世开始,构造变形扩展到整个研究区,不仅西昆仑构造带和车尔臣断裂带表现出强烈变形,而且阿尔金断层走滑作用强烈,导致北侧次级断层的强烈走滑冲断作用和若羌山前挤压挠曲盆地的形成。新生代时期,西昆仑构造带北向冲断作用要早于阿尔金构造带的走滑变形,阿尔金构造带的走滑作用对西昆仑构造带北向冲断构造有强烈的改造。     

塔里木盆地中南部麻扎塔格逆冲—褶皱带变形特征及其意义

麻扎塔格地区地层、地貌及构造变形特征的研究,对于认识塔里木盆地新生代构造演化过程、塔里木—西昆仑的盆山耦合关系、新构造运动对塔里木油气资源分布的影响以及塔克拉玛干沙漠的气候、环境变化都具有重要意义。本文通过卫星照片解译、野外变形观察、剖面实测、地球物理资料解释等手段,对该地区晚新生代的构造特征进行了研究,确定了麻扎塔格构造带为典型的逆冲—褶皱带,并探讨了麻扎塔格逆冲—褶皱带的构造指向、活动时限、隆升速率及缩短速率、东西方向的延伸等问题,取得如下认识:1)麻扎塔格逆冲—褶皱带为西昆仑山前陆褶皱冲断带的前缘部位,和田河气田就是处在逆冲前锋背斜顶部,晚新生代变形作用已明显地改造了塔里木盆地南部及中部的古生代和中生代构造,并促成了和田河气田的形成;2)麻扎塔格山在中新世末(约7 Ma)和中更新世(约780 ka B.P.)经历了两次构造隆升,后一次形成了麻扎塔格逆冲—褶皱带和麻扎塔格山现今的地貌特征;3)估算出麻扎塔格逆冲—褶皱带中更新世以来的隆升速率约为0.26～0.4 mm/a,缩短速率约为0.9 mm/a;4)认为麻扎塔格逆冲—褶皱带向西应与同属西昆仑山前褶皱—冲断带前缘的喀什背斜相连,东端的突然消失可能是由于东段和田河附近存在北东—南西向的走滑断层造成。     

塔里木盆地巴楚隆起断裂差异活动特征及成因演化

巴楚隆起是塔里木盆地重要的含油气构造单元,因其断裂构造特征与演化异常复杂,严重制约了对该地区构造特征及演化的认识和油气勘探工作。本文通过对地震资料精细构造解释,并结合塔里木盆地构造演化背景及最新的钻井、露头等资料,阐明了巴楚隆起断裂活动具有明显的分期差异性和分区、分带、分段及分层差异性。巴楚隆起断裂构造主要经历了4期差异活动,即加里东早期发育张扭性断裂、海西晚期断裂挤压反转、喜马拉雅山中期断裂强烈压扭逆冲与分区差异变形、喜马拉雅山晚期西南缘断裂带分段分层差异改造与叠加。断裂演化主要受控于加里东早期、海西晚期和喜马拉雅山中-晚期构造运动及对应时期塔里木古陆周缘洋盆开合与造山作用,喜马拉雅山中期是巴楚隆起断裂活动关键期,因受西昆仑和西南天山强烈挤压,隆起西段发生“屈服型”冲断隆升与走滑旋转,东段相应发生“受限型”弧形逆冲与向南掀斜,喜马拉雅山晚期断裂主要活动表现在隆起西北缘和西南缘,特别在西南缘断裂带发生了强烈的分段、分层差异叠加改造,其成因与西昆仑强烈隆升和向北挤压密切相关。     

西昆仑山前晚三叠世古构造特征及对侏罗-白垩纪沉积的控制

造山带和盆地是在时空发展和形成机制上具有密切联系的构造系统。青藏高原内部晚三叠世古特提斯造山带的形成,对北缘的塔里木盆地产生了重要的影响,导致了盆地内部西昆仑山前地区发生了强烈的冲断构造变形,而这一冲断构造变形所形成的古构造-古地貌对后期侏罗-白垩纪的沉积具有重要的控制作用,同时也决定了该地区的油气分布。本文基于对西昆仑山前露头区中生代地层分布详细的野外考察和盆地覆盖区钻井资料的整理,结合对盆-山结合带清晰地震剖面的详细解释,开展西昆仑山前的晚三叠世古构造特征及侏罗-白垩纪沉积充填过程研究,以期揭示晚三叠世的古构造-古地貌特征及对沉积的控制作用。通过研究发现,西昆仑山前地区发育晚三叠世前陆褶皱冲断带,冲断带根部发育基底卷入构造,锋带发育叠瓦状构造;古生界受逆冲断裂控制,形成一系列的北陡南缓的背斜隆起,冲断带前锋位置与新生代构造前锋位置相近。三叠纪末古地貌形态由于特提斯造山带的强烈隆升,总体呈南高北低的地貌形态,但是褶皱冲断构造带受地表风化剥蚀作用,背斜核部形成南缓北陡的古隆起,而断层破碎带形成南陡北缓的洼地,是侏罗系发育前的基本地貌格架。早侏罗世受特提斯造山带造山后伸展的影响,西昆仑山前发育4个箕状断陷,控陷断层发育于古造山带一侧;受大型控陷断层的影响,在断陷内部呈北高南低的地形特点,断陷内侏罗系逐渐向北部斜坡超覆。晚三叠世形成的古构造-古地貌与早侏罗世断陷叠加形成的古地理格架一直控制了侏罗纪-早白垩世的沉积,直到晚白垩世沉积时才没有起到控制作用。     

东昆仑阿其克库勒湖地区的逆冲扩展作用

东昆仑西段是我国西北地区地质研究程度较低的地区之一。通过典型剖面的构造分析，可以得出下列几点重要认识：①东昆仑西段具有十分发育的断裂构造系统，逆冲扩展、正滑作用和拆离作用是该区的主要变形事件。②逆冲断裂起始于晚石炭世和晚三叠世—早侏罗世时期，但强烈活动发生在库木库里盆地强烈坳陷的中新世—第四纪时期。③该区北向逆冲扩展作用和南向正滑作用并存的构造格局，和青藏高原北部的总体构造格局相一致，与青藏高原南缘喜马拉雅地区的的构造格局也十分类似，但逆冲扩展方向相反，强烈逆冲扩展作用都发生在中—上新世至第四纪印度板块与欧亚板块强烈碰撞和青藏高原急剧隆升时期。这种方向相反的逆冲扩展和正滑作用揭示青藏高原深层物质向南、北两侧对称式扩展和表层物质向高原腹地重力滑动的运动学特征。因此该区断裂构造系统的建立对研究青藏高原北部的深部作用过程，建立青藏高原隆升的统一的地球动力学模式提供了一种思路。     

英吉苏凹陷中─新生代背驮式前陆盆地构造特征及成因机制

英吉苏中新生代凹陷是在古生代逆冲推覆构造背景之上发育起来的背驮式前陆盆地。盆地的沉积作用和变形作用严格受基底参与的逆冲断层的控制。中新生代构造由北向南可划分七个带：北部斜坡带；群克─新开屏背斜带；英北向斜带；阿拉干背斜带；英南向斜带；古城墟斜坡带和罗布庄断凸带。叠瓦式逆冲断层、冲起构造、构造三角带、断展褶皱和披覆构造是英吉苏凹陷的主要变形样式。自三叠纪以来，不同时期的沉积中心自造山带向前陆方向迁移。 中新生界变形的动力学和运动学是与塔里木板块南缘活动大陆边缘的板块拼贴事件和壳内拆离缩短作用有关。     

塔里木盆地断裂构造分期差异活动及其变形机理

本文的目的是探讨塔里木盆地断裂构造分期差异活动过程及其变形机理.在地震剖面解释、钻井资料和地质资料综合分析的基础上,通过编制塔里木盆地不同时期断裂系统图,提出控制塔里木盆地断裂构造形成和演化主要构造活动期次为:加里东早期、加里东中期、加里东晚期-海西早期、海西晚期、印支期、燕山期和喜马拉雅期.加里东早期断裂活动受伸展环境制约,沿先存基底断裂带形成张性正断层.加里东中期、加里东晚期-海西早期断裂活动以逆冲作用为主,在塔东、塔中、塘古巴斯、巴楚和麦盖提地区最为发育.海西晚期断裂活动也是以逆冲作用为特征,并从早期断裂强烈活动的塔中、塘古巴斯、玛东等地区,迁移到塔北隆起和东部地区.印支、燕山和喜马拉雅期,前陆地区断裂构造发育,形成叠瓦冲断带、褶皱-冲断带、双重构造、盐相关构造等;但在盆内稳定区,断裂构造不发育,活动性弱.古生代断裂构造发育分布的控制机理,主要与区域大地构造环境的变化和构造转换、先存基底断裂带、大型区域性不整合、滑脱带等要素密切相关.区域大地构造环境的变化和构造转换主要受控于塔里木周缘洋盆的伸展裂解、俯冲消减和洋盆闭合的时限和强度.先存基底断裂带或基底构造软弱带往往控制着后期断裂的发育位置和展布方向.大型区域性不整合和滑脱带控制着断裂构造的发育和分布层位.中、新生代断裂构造发育分布的控制机理,与区域大地构造环境及其构造转换、区域构造位置有关.中、新生代塔里木断裂构造主要分为三种环境,即前陆构造环境、盆内稳定区构造环境和隆升剥蚀区构造环境.盆内稳定区断裂构造不发育,活动性较弱.中、新生代断裂构造主体发育在前陆构造环境中,主要受控于周缘造山带强烈隆升、挤压冲断、走滑-逆冲或逆冲-走滑作用,同时与喜马拉雅晚期盆-山耦合作用及滑脱层的发育有关.