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1.
《Earth and Planetary Science Letters》2006,241(1-2):323-335
Geologic maps have long portrayed the Late Cretaceous–Recent geologic history of southeastern Mongolia as tectonically quiescent. We present new data based on outcrop observations that indicate the northeast-trending East Gobi fault zone (EGFZ) was reactivated in the Cenozoic as a sinistral strike-slip fault system. Inversions of Cenozoic fault-slip data imply that faulting was associated with north–northwest subhorizontal shortening and east–northeast subhorizontal extension. We propose that faulting is Tertiary in age based on published interpretations of seismic reflection data which reveal that the mid-Cretaceous (∼100–95 Ma) unconformity is deformed by strike-slip faults, and based on field observation of strike-slip faults and fracture sets that cut Upper Cretaceous and Cenozoic strata but lack evidence for neotectonic activity. Published seismicity maps also appear to argue against significant Quaternary faulting within the EGFZ. These new data may lend credence to published models proposing a Middle Miocene or older kinematic linkage between the EGFZ and the Altyn Tagh fault in China. The recognition that the EGFZ has a history of left-lateral displacement in both the Early Mesozoic and Cenozoic means that currently available estimates of offset based on displaced Paleozoic rocks constrain total offset only. This reactivation history supports the notion that inherited lithospheric structures are important in controlling the location and, thus, modes of intracontinental deformation in Asia as a function of collisional far field effects and evolving boundary conditions of the Pacific margin. 相似文献
2.
在野外实测工作基础上, 对香山北缘活动断裂带东段自晚更新世以来的水平活动强度分时、 分段进行了研究. 结果表明, 该断裂带东段自晚更新世以来, 总体水平活动强度不大: 晚更新世早—中期水平位移速率为1.44 mm/a, 晚期水平位移速率为0.53 mm/a, 全新世水平位移速率为1.01 mm/a. 该断裂带左旋走滑强度在走向上具有不均一性, 而且其活动强度的最大部位(活动中心)随时间向东发生迁移, 碱沟—刘岗井次级断层是现今活动强度最大的次级断层. 相似文献
3.
LI Wei DONG YunPeng GUO AnLin LIU XiaoMing LIU YiQun ZHA XianFeng ZHANG KuaiLe 《中国科学:地球科学(英文版)》2013,56(10):1639-1653
The Qinling Orogenic Belt is divided commonly by the Fengxian-Taibai strike-slip shear zone and the Huicheng Basin into the East and West Qinling mountains,which show significant geological differences after the Indosinian orogeny.The Fengxian-Taibai fault zone and the Meso-Cenozoic Huicheng Basin,situated at the boundary of the East and West Qinling,provide a natural laboratory for tectonic analysis and sedimentological study of intracontinental tectonic evolution of the Qinling Orogenic Belt.In order to explain the dynamic development of the Huicheng Basin and elucidate its post-orogenic tectonic evolution at the junction of the East and West Qinling,we studied the geometry and kinematics of fault zones between the blocks of West Qinling,as well as the sedimentary fill history of the Huicheng Basin.First,we found that after the collisional orogeny in the Late Triassic,post-orogenic extensional collapse occurred in the Early and Middle Jurassic within the Qinling Orogenic Belt,resulting in a series of rift basins.Second,in the Late Jurassic and Early Cretaceous,a NE-SW compressive stress field caused large-scale sinistral strike-slip faults in the Qinling Orogenic Belt,causing intracontinental escape tectonics at the junction of the East and West Qinling,including eastward finite escape of the East Qinling micro-plate and southwest lateral escape of the Bikou Terrane.Meanwhile,the strike-slip-related Early Cretaceous sedimentary basin was formed with a right-order echelon arrangement in sinistral shear zones along the southern margin of the Huicheng fault.Overall during the Mesozoic,the Huicheng Basin and surrounding areas experienced four tectonic evolutionary stages,including extensional rift basin development in the Early and Middle Jurassic,intense compressive uplift in the Late Jurassic,formation of a strike-slip extensional basin in the Early Cretaceous,and compressive uplift in the Late Cretaceous. 相似文献
4.
基于地震剖面解释的构造分析表明，河西走廊西段及邻区发育有许多晚第三纪-第四纪的逆断层与走滑断层. 其主要类型有两种:一是与北祁连逆冲推覆作用有关的南倾逆断层，其走向北西，主要分布于北祁连山东北缘及河西走廊西南部地区；二是与阿尔金断裂活动有关的逆断层与走滑断层，主要分布于红柳峡、宽台山——合黎山地区. 这些断层与新生代始新世末期以来印-藏碰撞的远距离效应有关. 它们于晚第三纪开始活动，主要活动于第四纪时期，而且大多目前仍在活动，属于活动性断层，是河西走廊地区地震的潜发因素. 此外，它们还造成了地层的强烈变形，形成了一系列的地貌阶地和河流的水平错移. 相似文献
5.
Introduction Hexi Corridor, a corridor extended over 1 000 km and with a strike of WNW-ESE, is locatedbetween Alxa uplift and northern Qilianshan Caledonian folding belt of northern Qinghai-Xizang(Tibet) Plateau (Figure 1). In the paper, we will discuss the regions between Altun fault and Yu-mushan of the western Hexi Corridor, where the climate is arid, which results in sparse vegetation,but abundant oil and gas resource, and being one of the most important petroleum industry base… 相似文献
6.
We investigate the geometry and kinematics of the faults exposed in basement rocks along the Strouma River in SW Bulgaria as well as the sequence of faulting events in order to place constraints on the Cenozoic kinematic evolution of this structurally complex domain. In order to decipher the successive stress fields that prevailed during the tectonic history, we additionally carried out an analysis of mesoscale striated faults in terms of paleostress with a novel approach. This approach is based on the P–T axes distribution of the fault-slip data, and separates the fault-slip data into different groups which are characterized by kinematic compatibility, i.e., their P and T axes have similar orientations. From these fault groups, stress tensors are resolved and in case these stress tensors define similar stress regimes (i.e., the orientations of the stress axes and the stress shape ratios are similar) then the fault groups are further unified. The merged fault groups after being filled out with those fault-slip data that have not been incorporated into the above described grouping, but which present similar geometric and kinematic features are used for defining the final stress regimes. In addition, the sequence of faulting events was constrained by available tectonostratigraphic data.Five faulting events named D1, D2, D3, D4 and D5 are distinguished since the Late Oligocene. D1 is a pure compression stress regime with σ1 stress axis trending NNE-SSW that mainly activated the WNW-ESE to ENE-WSW faults as reverse to oblique reverse and the NNW-SSE striking as right-lateral oblique contractional faults during the Latest Oligocene-Earliest Miocene. D2 is a strike-slip − transpression stress regime with σ1 stress axis trending NNE-SSW that mainly activated the NNW-SSE to N-S striking as right-lateral strike-slip faults and the ENE-WSW striking faults as left-lateral strike-slip ones during the Early-Middle Miocene. D3 extensional event is associated with a NW-SE to WNW-ESE extension causing the activation of mainly low-angle normal faults of NE-SW strike and NNE-SSW to NNW-SSE striking high-angle normal faults. D4 is an extensional event dated from Late Miocene to Late Pliocene. It activated NNW-SSE to NW-SE faults as normal faults and E-W to WNW-ESE faults as right-lateral oblique extensional faults. The latest D5 event is an N-S extensional stress regime that dominates the wider area of SW Bulgaria in Quaternary times. It mainly activated faults that generally strike E-W (ENE-WSW and WNW-ESE) normal faults, along which fault-bounded basins developed. The D1 and D2 events are interpreted as two progressive stages of transpressional tectonics related to the late stages of collision between Apulia and Eurasia plates. These processes gave rise to the lateral extrusion of the Rhodope and Balkan regions toward the SE along the Strouma Lineament. The D3 event is attributed to the latest stage of this collision, and represents the relaxation of the overthickened crust along the direction of the lateral extrusion. The D4 and D5 events are interpreted as post-orogenic extensional events related to the retreat of the Hellenic subduction zone since the Late Miocene and to the widespread back-arc Aegean extension still prevailing today. 相似文献
7.
Abstract The different ophiolite complexes in the Philippine island arc system define a progressive younging direction westward. This resulted from the clockwise rotation of the Philippine island arc system during its north-westward translation in the Eocene resulting in its western boundary colliding with the Sundaland–Eurasian margin. As a consequence of this interaction, ophiolite complexes and mélanges accreted into the Philippine island arc system along its western side. A new ophiolite zonation with four belts is proposed that takes into consideration the observed spatial and temporal relationships of the exposed oceanic lithosphere slices. With progressive younging from east to west, Belt 1 corresponds to Late Cretaceous complete ophiolite complexes with associated metamorphic soles along the eastern Philippines, whereas Belt 2 includes Early to Late Cretaceous dismembered ultramafic-mafic complexes with mélanges exposed mainly west of eastern Philippines. Belt 3 is defined by Cretaceous through Eocene to Oligocene ophiolite complexes emplaced along the collision zone between the Philippine Mobile Belt and the Sundaland–Eurasian margin. Belt 4 corresponds to the ophiolite complexes emplaced along continental margins as exposed in the Palawan and Zamboanga–Sulu areas. This proposed zonation hints that the whole Philippine Mobile Belt, except for the strike-slip fault bounded Eocene Zambales ophiolite complex in Luzon, is underlain by Cretaceous proto-Philippine Sea Plate fragments. This is contrary to the previous models that consider only the eastern margin of the Philippines to contain proto-Philippine Sea Plate materials. 相似文献
8.
Kunming basin is a Cenozoic faulted basin under the control of mainly SN-trending active faults. In and around the basin, there are a total of eight major active faults. Seismo-geological survey and fault slip observation show that the SN- and NE-trending active faults are mostly sinistral strike-slip faults, while the NW-trending faults are mostly dextral strike-slip faults. Using stress tensor inversion method with 706 active fault striation data at 22 measurement sites, we determined tectonic stress field of the study area. The result shows that modern tectonic stress field in and around Kunming basin is characterized by NNW-SSE compression, ENE-WSW extension, and strike-slip stress regimes. The maximum principal compressional stress (σ1) is oriented 335o~2o, with an average dip angle of 21°; the minimum (σ3) is oriented 44o~93o, with an average dip angle of 14°, and the intermediate (σ2) has a high, or nearly vertical, dip angle. The inversion result from fault slip data is consistent with the result from focal mechanism solutions. 相似文献
9.
History and modes of Mesozoic accretion in Southeastern Russia 总被引：8，自引：1，他引：8
Abstract The history of Mesozoic accretion and growth of the Asia eastern margin, occupied by Southeastern Russia, includes five main events; two main tectonic regimes were responsible for the growth of the continent. In the Triassic-Jurassic, Early Cretaceous and Late Cretaceous-Paleogene, the subduction of the oceanic lithosphere resulted in the formation of wide accretionary wedges of the Mongol-Okhotsk, Khingan-Okhotsk and Eastern Sikhote-Alin active continental margins, respectively. These stages of the comparatively slow growth of the continent were broken by stages of rapid growth and drastic changes in the shape of the continent, since at these stages large terranes of various tectonic nature collided with active continental margins. At the end of the Early-Middle Jurassic, the Bureya terranes collided with the Mongol-Okhotsk active margin, and at the beginning of the Late Cretaceous there was collision of the Central and Southern Sikhote-Alin terranes with the Khingan-Okhotsk active margin.
Collision-related structural styles in all cases are indicative of oblique collision and great strike-slip motions along the main sutures. The peculiarities of the terrane's geological structure show that prior to collision with the Mongol-Okhotsk and Khingan-Okhotsk active margins, they had already accreted to Asia and then migrated along its margins along the strike-slip faults. The Bureya terranes were squeezed out of the compression zone between Siberia and North China. This compression zone originated after the Paleozoic oceans which divided these cratons had closed. The Khanka terranes and Mesozoic accretionary wedge terranes of the Sikhote-Alin shifted along the strike-slip faults subparallel to the Asia Pacific margin. Strike-slip motions resulted in duplication of the primary tectonic zonation. 相似文献
Collision-related structural styles in all cases are indicative of oblique collision and great strike-slip motions along the main sutures. The peculiarities of the terrane's geological structure show that prior to collision with the Mongol-Okhotsk and Khingan-Okhotsk active margins, they had already accreted to Asia and then migrated along its margins along the strike-slip faults. The Bureya terranes were squeezed out of the compression zone between Siberia and North China. This compression zone originated after the Paleozoic oceans which divided these cratons had closed. The Khanka terranes and Mesozoic accretionary wedge terranes of the Sikhote-Alin shifted along the strike-slip faults subparallel to the Asia Pacific margin. Strike-slip motions resulted in duplication of the primary tectonic zonation. 相似文献
10.
The Sürgü Fault Zone (SFZ) is located in SE Anatolia extending from Göksun in the west to Çelikhan in the east, where it bifurcates from the East Anatolian Fault Zone. A detailed analysis along the fault using satellite images, digital elevation models (DEMs) and aerial photographs revealed that the SFZ displays characteristic deformation patterns common to dextral strike-slip faults, including pressure ridges, displaced linear valleys, and deflected stream courses. In addition to this, fault slip data collected from 17 sites indicated that the SFZ is a dextral strike-slip fault zone having reverse and normal components in its western and eastern parts, respectively. The type of dip-slip components, orientation of the palaeostress configurations, and related structures along the fault are compatible with along strike variations of a strike-slip fault system that supports the dextral nature of the fault zone. Observed maximum cumulative stream deflections along the fault zone indicate that the dextral offset of the SFZ has been more than 3 km since the establishment of the stream network in the region. According to the preferred tectonic model suggested in this study, the present dextral motion along the SFZ occurs within a regional sinistral system related to westwards escape of the Maraş Block, squeezed between Anatolian Block and Arabian Plate in N–S direction. 相似文献
11.
Oceanic plate subduction history in the western Pacific Ocean: Constraint from late Mesozoic evolution of the Tan-Lu Fault Zone 总被引：4，自引：0，他引：4
Guang Zhu Cheng Liu Chengchuan Gu Shuai Zhang Yunjian Li Nan Su Shiye Xiao 《中国科学:地球科学(英文版)》2018,61(4):386-405
The NE- to NNE-striking Tan-Lu Fault Zone (TLFZ) is the largest fault zone in East China, and a typical representative for the circum-Pacific tectonics. Its late Mesozoic evolution resulted from subduction of the Paleo-Pacific Plate, and can be used for indication to the subduction history. The TLFZ reactivated at the end of Middle Jurassic since its origination in Middle Triassic. This phase of sinistral motion can only be recognized along the eastern edge of the Dabie-Sulu orogenis, and indicates initiation of the Paleo-Pacific (Izanagi) Plate subduction beneath the East China continent. After the Late Jurassic standstill, the fault zone experienced intense sinistral faulting again at the beginning of Early Cretaceous under N-S compression that resulted from the NNW-ward, low-angle, high-speed subduction of the Izanagi Plate. It turned into normal faulting in the rest of Early Cretaceous, which was simultaneous with the peak destruction of the North China Craton caused by backarc extension that resulted from rollback of the subducting Izanagi Plate. The TLFZ was subjected to sinistral, transpressive displacement again at the end of Early Cretaceous. This shortening event led to termination of the North China Craton destruction. The fault zone suffered local normal faulting in Late Cretaceous due to the far-field, weak backarc extension. The late Mesozoic evolution of the TLFZ show repeated alternation between the transpressive strike-slip motion and normal faulting. Each of the sinistral faulting event took place in a relatively short period whereas every normal faulting event lasted in a longer period, which are related to the subduction way and history of the Paleo-Pacific Plates. 相似文献
12.
以28口钻井、3条主干地震剖面最新解释成果资料为依据的构造沉降史恢复结果表明：琼东南盆地新生代存在三期快速沉降过程和一期缓慢沉降过程：第一期为始新世,第二期为渐新世—早中新世,第三期存在时空差异：在盆地西部乐东凹陷为晚中新世以来,在盆地中东部陵水凹陷和松南-宝岛凹陷为上新世以来;缓慢沉降过程亦存在时空差异,盆地西部中中新世沉降缓慢,盆地中东部中—晚中新世沉降缓慢.第一期快速沉降过程受东亚陆缘扩张和红河断裂左旋走滑共同影响,第二期快速沉降受南海海底扩张和红河断裂左旋走滑联合作用,第三期快速沉降主要受红河断裂右旋走滑控制,缓慢沉降过程与南海海底扩张停止以及红河断裂构造活动处于宁静阶段相耦合. 相似文献
13.
Chen Zhengle Zhang Yueqiao Chen Xuanhua Wang Xiaofeng Ramon A. S. Zack W. B. 《中国科学:地球科学(英文版)》2001,44(1):103-111
The ENE-striking Altyn Tagh fault (ATF), extending along the northern edge of the Ti-betan Plateau, is one of the major important strike-slip faults, and has been known as one of the key areas to debate the eastward extrusion and crustral shortening models of the Tibetan Plateau during and after India-Asia collision. This paper mainly presents new evidence of Late Cenozoic sedimentary process to reconstruct the slip history of the ATF during the Late Cenozoic. Field measurements and laboratory analyses of the sedimentary characteristics in the Late Cenozoic basins in the central Altyn Tagh fault suggest that Late Cenozoic sedimentary sequence should be divided into three units according to facies changes. The paleo-topography reconstruction shows that the sedimentarion in these basins was tightly related with the fault, indicating that the ATF has experienced at least three stages of strike slipping in the Late Cenozoic. New geological data from the Late Cenozoic sedimentary basins and the formation of the present Suo’erkuli basin provide evidence for the displacement of the fault. The result shows that the 80–100 km left-lateral strike-slip displacement of the fault has been accumulated in the Late Cenozoic.
相似文献14.
15.
Studies on40Ar/39Ar thermochronology of strike-slip time of the Tan-Lu fault zone and their tectonic implications 总被引：6，自引：0，他引：6
Samples of mylonite, ultramylonite and phyllonite were collected from 5 localities in the Anhui part of the Tan-Lu fault zone
for40Ar/39Ar chronological studies. Among them 4 samples from 3 localities on the eastern margin of the Dabie orogenic belt yielded40Ar/39Ar plateau ages of 128 —132 Ma; and 2 samples from the western margin of the Zhangbalin uplift and eastern margin of the Bengbu
uplift gave the same40Ar/39Ar plateau ages of 120 Ma. Isochron analyses and other lines of evidence suggest that the data are reliable. The data are
interpreted as cooling ages of sinistral strike-slip deformation of the Tan-Lu fault zone. The younger ages from the north
might be related to slower strike-slip rising. These results indicate that the large-scale left-lateral displacement in the
Tan-Lu fault zone took place in the Early Cretaceous, rather than in Late Triassic (Indosinian) as proposed by some geologists.
Therefore, this fault zone is an intracontinental wrench fault rather than a transform fault or suture line developed during
formation of the Dabie orogenic belt. 相似文献
16.
THE LATE QUATERNARY ACTIVITY AND FORMATION MECHANISM OF BAOERTU FAULT ZONE,EASTERN TIANSHAN SEGMENT 
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下载免费PDF全文 REN Guang-xue LI Chuan-you WU Chuan-yong WANG Si-yu ZHANG Hui-ping REN Zhi-kun LI Xin-nan 《地震地质》2019,41(4):856-871
Influenced by the far-field effect of India-Eurasia collision, Tianshan Mountains is one of the most intensely deformed and seismically active intracontinental orogenic belts in Cenozoic. The deformation of Tianshan is not only concentrated on its south and north margins, but also on the interior of the orogen. The deformation of the interior of Tianshan is dominated by NW-trending right-lateral strike-slip faults and ENE-trending left-lateral strike-slip faults. Compared with numerous studies on the south and north margins of Tianshan, little work has been done to quantify the slip rates of faults within the Tianshan Mountains. Therefore, it is a significant approach for geologists to understand the current tectonic deformation style of Tianshan Mountains by studying the late Quaternary deformation characteristics of large fault and fold zones extending through the interior of Tianshan. In this paper, we focus on a large near EW trending fault, the Baoertu Fault (BETF) in the interior of Tianshan, which is a large fault in the eastern Tianshan area with apparent features of deformation, and a boundary fault between the central and southern Tianshan. An MS5.0 earthquake event occurred on BETF, which indicates that this fault is still active. In order to understand the kinematics and obtain the late Quaternary slip rate of BETF, we made a detailed research on its late Quaternary kinematic features based on remote sensing interpretation, drone photography, and field geological and geomorphologic survey, the results show that the BETF is of left-lateral strike-slip with thrust component in late Quaternary. In the northwestern Kumishi basin, BETF sinistrally offsets the late Pleistocene piedmont alluvial fans, forming fault scarps and generating sinistral displacement of gullies and geomorphic surfaces. In the bedrock region west of Benbutu village, BETF cuts through the bedrock and forms the trough valley. Besides, a series of drainages or rivers which cross the fault zone and date from late Pleistocene have been left-laterally offset systematically, resulting in a sinistral displacement ranging 0.93~4.53km. By constructing the digital elevation model (DEM) for the three sites of typical deformed morphologic units, we measured the heights of fault scarps and left-lateral displacements of different gullies forming in different times, and the result shows that BEFT is dominated by left-lateral strike-slip with thrust component. We realign the bended channels across the fault at BET01 site and obtain the largest displacement of 67m. And we propose that the abandon age of the deformed fan is about 120ka according to the features of the fan. Based on the offsets of channels at BET01 and the abandon age of deformed fan, we estimate the slip rate of 0.56mm/a since late Quaternary. The Tianshan Mountains is divided into several sub-blocks by large faults within the orogen. The deformation in the interior of Tianshan can be accommodated or absorbed by relative movement or rotation. The relative movement of the two sub-blocks surrounded by Boa Fault, Kaiduhe Fault and BETF is the dominant cause for the left-lateral movement of BETF. The left-lateral strike-slip with reverse component of BETF in late Quaternary not only accommodates the horizontal stain within eastern Tianshan but also absorbs some SN shortening of the crust. 相似文献
17.
横亘新疆境内的天山及其周边的西昆仑、阿尔金和阿尔泰是中国大陆著名的强构造运动区和地震活动带。在对新疆构造区应力环境、动力过程、断层运动变形特征和地震序列分析讨论的基础上,对新疆及其周缘主要构造区地震破裂方式和序列类型进行研究,得出如下结论:(1)西昆仑构造区受来自青藏块体和塔里木块体NS和NW向水平压应力和垂向力的作用,构造运动呈现出走滑与逆冲特征,震源破裂以走滑型为主,数量较少的逆断型地震主要分布在西昆仑帕米尔一侧的深震挤压区,正断型地震主要出现在西昆仑与阿尔金交汇的拉张盆地及附近。该区主余型地震占63%,6级以上地震序列也存在多震类型。(2)阿尔金断裂带位于西昆仑北缘断裂和北祁连断裂过渡带,受青藏块体向北和向西的推挤,断裂本身的左旋位移量通过两端逆冲挤压而转化,使得青藏高原北边界不断向外扩展。在此力源下,阿尔金断裂带震源破裂以走滑为主,也有少量的逆冲型地震。地震序列中主余型和孤立型地震占比相同(占44%)。(3)在印度板块和亚欧大陆碰撞效应影响下,天山地区产生近NNE向水平压应力,构造运动显现出带旋性特征的逆冲和走滑,震源破裂方式与之相吻合。而天山构造大跨度的空间展布、扩展形式的多样性和地震破裂的两重性,又影响到地震序列类型的多样性,使得主余型、孤立型和多震型地震在不同构造部位呈现优势分布。(4)阿尔泰的构造运动可能受到了来自印度板块与亚欧板块碰撞的远程效应和西伯利亚块体南向运动的双向影响,形成NNE和SW向水平挤压力,主要大型发震断裂做右旋剪扭错动,而一些深断裂则以逆冲运动为主。震源破裂呈现出走滑(占64%)和部分的逆冲(占27%),6级以上地震序列主要为主余型,5级左右地震则多为孤立型。 相似文献
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ChengChuan Gu Guang Zhu MingJian Zhai ShaoZe Lin LiHong Song Bei Liu 《中国科学:地球科学(英文版)》2016,59(12):2389-2410
The NE-striking Yilan-Yitong Fault Zone(YYFZ) with a length of ca. 900 km is an important major fault zone in northeastern China. Its origin has been a controversial issue for a long time. Detailed field investigation and comprehensive analyses show that strike-slip faults or ductile shear belts exist as the origination structures on the both shoulders of the Cretaceous-Paleogene grabens. These strike-slip structures are dominated by brittle transcurrent faults, and appear as ductile shear belts only in the Weiyuanpu-Yehe and Shulan parts in the south and middle of the fault zone, respectively. The shear belts strike NE-SW and show steep mylonitic foliation and gentle mineral elongation lineation. Outcrop structures, microstructures and quartz c-axis fabrics demonstrate a sinistral shear sense with minor reverse component for the ductile shear belts. The microstructures suggest deformation temperatures of 400–450°C for the Weiyuanpu-Yehe shear belts and 350–400°C for the Shulan shear belt. A series of zircon U-Pb dating results for deformed and undeformed plutons or dikes in the shear belts constrain the strike-slip motion to the time between 160 and 126 Ma. It is further inferred from ages of main geological events in this region that the fault zone originated in the earliest Early Cretaceous. It is suggested therefore that the southern and middle parts of the Tan-Lu Fault Zone, which originated in Middle Triassic, propagated into northeastern China along the sinistral YYFZ under the earliest Early Cretaceous regional compression that is referred to as the Yanshan B event. The earliest Early Cretaceous initiation of the YYFZ results from both the high-speed oblique subduction of the Izanagi Plate and the final closure of the Mongol-Okhotsk Ocean, but the Izanagi Plate subduction played a major dynamic role in the fault zone origin. 相似文献
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