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Multi-level decollement zones and detachment deformation of longmenshan thrust belt,Sichuan Basin,southwest China

Science China Earth Sciences 2008年第S2期51卷 32-43页

作者： TANG LiangJie1,2,3,YANG KeMing4,JIN WenZheng1,2,3,L ZhiZhou4 & YU YiXin1,2,3 1 State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum,Beijing 102249,China 2 Key Laboratory for Hydrocarbon Accumulation Mechanism,China University of Petroleum,Ministry of Education,Beijing 102249,China 3 Basin and Reservoir Research Center,China University of Petroleum,Beijing 102249,China 4 Southwest Division Company,SINOPEC,Chengdu 610081,China 1. State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum Beijing 102249 China 2. Key Laboratory for Hydrocarbon Accumulation Mechanism China University of Petroleum Ministry of Education Beijing 102249 China 3. Basin and Reservoir Research Center China University of Petroleum Beijing 102249 China 4. Southwest Division Company SINOPEC Chengdu 610081 China

As is well known that many decollement layers were developed in the longmenshan thrust belt,Si-chuan Basin,China. Through field investigation,explanation of seismic profiles and analysis of the balanced sections,we can divide the decollement zones into 3 categories: (1) the deep level decolle-ment zones,including the crust-mantle decollement layer,intracrustal decollement layer,and presinian basal decollement layer. The main structural styles of their deformation are the crust-mantle decoup-ling detachment deformation,the basal ductile shear deformation,etc.; (2) the middle level decollement zones,including the Cambrian-Ordovician decollement layer,the Silurian decollement layer,etc.,the main structural styles of their deformation are the isopachous fold,the angular fold,the saddle struc-ture,and the combination styles of them; and (3) the shallow level decollement zones,including the Xujiahe Formation decollement layer of Upper Triassic and the Jurassic decollement layers,the main structural styles of their deformation are the thrust-nappe tectonic,the pop-up,the triangle zone ,the duplex,etc. Multi-level decollement zones not only made the longmenshan thrust belt develop many different deformation styles from deep place to shallow place,but also made some local areas have the superimposition of the tectonic deformation apparently. This study indicates that the multi-level de-collement zones have a very important effect on the shaping and evolution of the longmenshan thrust belt.

关键词： decollement layer structural styles multi-level decollement zones longmenshan thrust belt

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Mesozoic and Cenozoic tectonic evolution of the longmenshan fault belt

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Science China Earth Sciences 2009年第5期52卷 579-592页

作者： WANG ErChie Institute of Geology and Geophysics State Key Laboratory of Lithospheric Evolution Chinese Academy of Sciences

The giant earthquake (M s=8.0) in Wenchuan on May 12, 2008 was triggered by oblique convergence between the Tibetan Plateau and the South China along the longmenshan fault belt. The longmenshan fault belt marks an imp... 详细信息

关键词： Wenchuan earthquake longmenshan landslide flooding Chengdu Plain

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Paleocommunity Replacements of Benthic Brachiopod in the Middle-Upper Devonian in the longmenshan Area,Southwestern China:Responses to Sea Level Fluctuations

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Acta Geologica Sinica(English Edition) 2005年第3期79卷 313-324页

作者： CHENYuanren LIXianghui CollegeofEarthSciences ChengduUniversityofTechnologyChengduSichuan610059 CollegeofEarthSciences ChengduUniversityofTechnologyChengduSichuan610059／／StateKeyLaboratoryofOil-GasReservoirGeologyandExploitationChengduUniversityofTechnologyChengduSichuan610059

Twelve paleocommunities dominated by benthic brachiopod are recognized in the Givetian-Frasnian stages of the Devonian in the longmenshan area, southwestern China, in which two kinds of brachiopod community replacement are classified. One is the abrupt replacement, represented by abrupt alternation between the Leiorhynchus community and Zhonghuacoelia-Striatopugnax community in the Frasnian Tuqiaozi Formation. The other is the gradual one, developed in the Givetian Guanwushan Formation, which had been completed by the shift of the Independatrypa lemma-Uncinulus heterocostellis-Emanuella takwanensis community via the Sinospongophyllum irregulare-Pseudomicroplasma fongi community to the Clathrocoilona spissa-Hexagonaria composite reef community. According to analyses of the paleocommunities, either the abrupt or gradual paleocommunity replacement of the Middle-Upper Devonian in the longmenshan area is suggested as a response to the 5th-order sea level fluctuation due to the replacements of the paleocommunities in a tracts-system of depositional sequence. It is supposed that changes of paleocommunity diversity, one of the results of paleocommunity replacement, are depended on the range and magnitude of sea level fluctuation, but there is not a linear relationship between them. Furthermore, a suggestion is proposed that the concept of paleocommunity succession seem to be abandoned in the paleocommunity analysis because it almost never be practiced to recover the information of community succession in the geological record at present.

关键词： community replacement brachiopod benthic paleocommunity sea level fluctuation Middle Devonian Upper Deovnian longmenshan Sichuan

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Relation between structural evolution of the longmenshan orogenic zone and sedimentation of its foreland basin

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Mining Science and Technology 2009年第6期19卷 807-812页

作者： LIAO Tai-ping HU Jing-jing ZHANG Fu-rong CHEN Hong-kai SUN Hong-quan School of Petroleum and Natural Gas Engineering Chongqing University of Science and Technology Chongqing 401331 China petroChina Research Institute of Petroleum Exploration and Development Beijing 100083 China Training Center Chongqing University of Science and Technology Chongqing 401331 China School of River and Ocean Engineering Chongqing Jiaotong University Chongqing 400074 China School of Civil Engineering Suzhou University of Science and Technology Suzhou Jiangsu 215011 China

In order to determine the area for oil and gas exploration in China’s north Sichuan basin,we have divided the time during which the longmenshan foreland basin was formed into five periods,based on the sedimentary response relationship of the foreland basin to structural evolution: 1) a late Triassic Noric period;2) an early-Middle Jurassic period;3) a late Jurassic to early Cretaceous period;4) a late Cretaceous to Paleogene-Neogene period and 5) the Quaternary period. As well,we analyzed the sedimentary environment and lithologic features of every basin-forming period. The results show that there are several favorable source-reservoir-cap assemblages in our study area,making it a major region for future oil and gas exploration in China’s northern Sichuan basin.

关键词： structural evolution foreland basin sedimentary response orogenic zone longmenshan

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Taphofacies Models of Devonian in longmenshan Area, Sichuan, China

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Journal of Earth Science 1999年第2期18卷 29-37页

作者： Chen Yuanren Wang Hongfeng Department of Geology, Chengdu University of Technology, Chengdu 610059

Taphonomy refers primarily to the study of processes between death and final burial of an organism or a group of organisms, including both taphonomic loss and taphonomic gain. Taphofacies refers to the taphonomic traits, which include the taphonomic attributes of all fossils and the lithologic features of their enclosing rocks. Taphofacies is different from lithofacies; as a taphonomic environmental setting or taphonomic condition, it is more useful than the stratigraphic body of rock. Based on the features of fossil preservation integrated with stratigraphic, sedimentologic and paleontologic evidence from Devonian of longmenshan area, it is distinguished and described 11 taphofacies models. For convenience in the field, the name of each taphofacies is divided into taphonomic and lithologic traits. The spatial relations between each taphofacies and the taphofacies with the benthic assemblages 1-6 are discussed.

关键词： taphonomy taphofacies model Devonian longmenshan Sichuan China.

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Analysis on Tectonic Movement of the longmenshan Fault Zone before the Wenchuan M_S 8. 0 Great Earthquake

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Earthquake Research in China 2014年第3期28卷 299-310页

作者： Ping Jianjun Jiang Zaisen Feng Xiangdong Ping Caipeng Shan Lianjun Wang Xia Earthquake Administration of Hebei Province Institute of Earthquake Science China Earthquake Administration Earthquake Administration of Xingtai City

On the basis of elastic rebound theory,using the horizontal velocity field of the Chinese mainland calculated from GPS data during three observation periods from 1999 to 2007,the velocity components that are parallel and plumb to the fault zone are calculated respectively for different periods,and then relative ground movements of two sides of the fault zone are analyzed with power function fitting and graphics. The results show that the relative ground movement shows right-lateral shear deformation before the Wenchuan MS8. 0 earthquake,and at the same time the movement was hindered by the longmenshan fault zone. Thus,this result has positive significance for distinguishing the elastic strain energy accumulation and deformation anomaly in an earthquake preparation process,and for conducting further research on earthquake prediction.

关键词： longmenshan GPS Right-lateral shear Elastic strain The WenchuanMs8. 0 earthquake

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Deformation Characters of the Maowen Fault Belt in longmenshan, Western Sichuan

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Continental Dynamics 2001年第1期6卷 35-39页

作者： TANG Zemin1, ZHANG Yueqiao2, YANG Nong2 1. Institute of Geology, Chinese Academy of Geological Sciences, 100037. 2. Institute of Geomechanics, Chinese Academy of Geological Sciences, 100081 Institute of Geology Chinese Academy of Geological Sciences 100037 Institute of Geomechanics Chinese Academy of Geological Sciences 100081

The Maowen fault belt is one of important fault belts of the intercontinental orogenic belt of longmenshan, mainly experienced three stage deformation; they are ductile shearing of thrust napping, brittle thrust napping and sinstral strike-slipping. Although Sc strike of mylonite formed by ductile shearing in early stage was reformed by later two stage brittle deformation, and changed greatly along the strike and inclination, the shear zone, as a whole, strikes NE and inclines NW. The stretching lineation is parallel or nearly parallel to the inclination of the ductile shear zone. According to the development of conjugated joints, the main compressive stress of the two stage brittle deformation is oriented to 306 and 2, respectively

关键词： Maoen fault belt ductile shear brittle deformation longmenshan western Sichuan

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Influence of fault geometry and fault interaction on strain partitioning within western Sichuan and its adjacent region

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Science China Earth Sciences 2010年第7期53卷 1056-1070页

作者： WANG Hui LIU Jie SHEN XuHui LIU Mian LI QingSong SHI YaoLin ZHANG GuoMin Institute of Earthquake Science China Earthquake AdministrationBeijing 100036China Department of Geological Sciences University of MissouriColumbiaMO 65211USA China Earthquake Network Center China Earthquake AdministrationBeijing 100045China Lunar and Planetary Institute HoustonTX 77058USA Laboratory of Computational Geodynamics Graduate University of Chinese Academy of SciencesBeijing 100049China

There are several major active fault zones in the western Sichuan and its vicinity. Slip rates and seismicity vary on different fault zones. For example, slip rates on the Xianshuihe fault zone are higher than 10 mm/a. Its seismicity is also intense. Slip rates on the longmenshan fault zone are low. However, Wenchuan Ms8.0 earthquake occurred on this fault zone in 2008. Here we study the impact of fault geometry on strain partitioning in the western Sichuan region using a three-dimensional viscoe- lastoplastic model. We conclude that the slip partitioning on the Xianshuihe-Xiaojiang fault presents as segmented, and it is related to fault geometry and fault structure. Slip rate is high on fault segment with simple geometry and structure, and vice versa. Strain rate outside the fault is localized around the fault segment with complex geometry and fault structure. Strain partitioning on the central section of the Xianshuihe-Xiaojiang fault zone is influenced by the interaction between the Anninghe-Zemuhe fault and the Daliangshan fault zone. Striking of the longmenshan fault zone is nearly orthogonal to the direction of eastward extrusion in the Tibetan Plateau. It leads to low slip rate on the fault zone.

关键词： Xianshuihe-Xiaojiang fault zone longmenshan fault zone fault geometry strain partitioning 3D viscoelastoplastic model

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Numerical and safety considerations about the Daguangbao landslide induced by the 2008 Wenchuan earthquake

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Journal of Rock Mechanics and Geotechnical Engineering 2019年第5期11卷 1019-1035页

作者： Manchao He L.Ribeiro e Sousa AndréMüller Eurípedes Vargas Jr. R.L.Sousa C.Sousa Oliveira Weili Gong State Key Laboratory of Geomechanics and Deep Underground Engineering(SKLGDUE) China University of Mining and TechnologyBeijingChina Tongji University ShanghaiChina Pontifical Catholic University of Rio de Janeiro Rio de JaneiroBrazil Khalifa University of Science and Technology Abu DhabiUnited Arab Emirates Technical Institute University of LisbonLisbonPortugal

The 2008 Wenchuan earthquake resulted in a large number of fatalities and caused significant economic *** of landslides,many of which are very large,were triggered by the earthquake.A majority of catastrophic landslides were distributed along the central longmenshan fault system,at the eastern margin of the Tibetan *** of the landslides resulted in sudden damming of rivers causing flooding,which in turn induced secondary sliding *** the most significant landslides,the Daguangbao landslide was the largest in volume with the maximum *** this,a numerical model of the Daguangbao landslide,using the material point method(MPM),was developed to simulate the interaction of the seismic loads imposed on the *** numerical results then are compared with the post-earthquake *** a consequence of the landslide,a nearly vertical head scarp with a maximum height of about 700 m was *** is considered as a high risk situation that requires constant monitoring and ***,we propose a methodology based on Bayesian networks(BNs)to manage the risk associated with the stability of the rockwall at the Daguangbao landslide site.

关键词： Wenchuan earthquake longmenshan fault Daguangbao landslide Material point method(MPM) Rockwall

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Focusing Seismic Energy along Faults through Time-Variable Rupture Modes: Wenchuan Earthquake, China

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Journal of Earth Science 2010年第6期21卷 910-922页

作者： Timothy M Kusky Abduwasit Ghulam 王璐刘建国李中全陈骁 Three Gorges Research Center for Geo-hazard Ministry of Education and State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Center for Environmental Sciences Saint Louis University Three Gorges Research Center for Geo-hazard Ministry of Education China University of Geosciences Department of Marine Geology Ocean University of China Department of Earth Science and Engineering Imperial College Department of Geosciences Chengdu University of Technology

Field analysis and differential interferometry derived from Synthetic Aperture Radar （PALSAR） of the epicentral area of the May 12 2008 Mw 8.0 Wenchuan （汶川） earthquake zone reveal details about fault ruptures and ground displacements, with field-documented vertical offsets reaching 12 m along the trace of the main fault rupture, and PALSAR-measured horizontal displacements reaching 12.3 m. We document slip indicators on the fault scarp that show initially sub-horizontal then progressively steeper slip increments with time along the same fault during the 2 min earthquake, suggesting that the rupture propagated as a mixed Mode Ⅱ-Ⅲ fracture, with strike-slip movement at the tip directing energy from the initial rupture to points north of the epicenter, followed by vertical displacement in the interior of the slipped region. Field, seismic, and PALSAR-measured displacements are dominantly thrust near the epicentral region, and dextral in northeasterly areas, showing that slipwas partitioned along the fault in space and time during the earthquake. The changing slip directions may correlate with three main pulses of energy release at 0, 23, and 57 s during the earthquake as recorded by seismograms. The earthquake generated massive landsfides 〉100 km north of the epicenter along the trace of the fault. These massive sturzstroms formed where entire mountainsides collapsed and moved at high velocity down populated mountain valleys, jumping smaller mountains and ricocheting off steep canyon walls. These avalanches rode on cushions of water and compressed air that generated air blasts from beneath the debris, knocking down trees high on opposing mountain slopes. The concentration of massive landslides and ground deformation so far north of the epicenter was related to the Mode Ⅱ-Ⅲ fracture propagation focusing seismic energy along the fault towards the north, explaining why so much devastation occurred 〉100 km from the epicenter, such as in the destroyed city of Beichuan （北川）.

关键词： China Wenchuan earthquake longmenshan neotectonics PALSAR.

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