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A challenge to the concept of slip-lines in extrusion tectonics

Geoscience Frontiers 2011年第1期2卷 23-34页

作者： Yadong Zheng~(a,*),Erchie Wang~b,Jinjiang Zhang~a,Tao Wang~c a Key Laboratory of Orogenic Belts and Crustal Evolution,Ministry of Education,School of Earth and Space Sciences, Peking University,Beijing 100871,China b Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China c Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China Key Laboratory of Orogenic Belts and Crustal Evolution Ministry of Education School of Earth and Space Sciences Peking University Beijing 100871 China Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 China

Wide-open V-shaped conjugate strike-slip faults in Asia are typically related to extrusion ***,the tectonic model based on the slip-line theory of plasticity has some critical problems associated with *** conjugate sets of slip-lines in plane deformation,according to the theory of plasticity should be normal to each another but,in reality,the angles between the conjugate strike-slip faults,which are regarded as slip-lines in extrusion tectonics in the eastern Mediterranean,Tibet-middle Asia,China and the Indochina Peninsular regions,are always more than 90°(on average～110°) in the direction of contraction. Another problem is that the slip-line theory fails to explain how,in some cases,e.g.,in the Anatolian area in the eastern Mediterranean,the extrusion rate is much higher than the indent *** two major problems are easy to solve in terms of the Maximum-Effective-Moment(MEM) Criterion that predicts that orientations of the shear zones are theoretically at an angle of 54.7°and practically at angles of 55°±10°with theσ- or contractional *** orientations of the strike-slip faults that accommodate extrusion tectonics are,therefore, fundamentally controlled by the MEM *** extrusion is along the MEM-orientations,the extruding rate is normally higher than the indenting rate.

关键词： extrusion tectonics Slip-line Wide-open V-shaped strike-slip faults MEM-Criterion Strain rate

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Active Faulting Pattern,Present-day Tectonic Stress Field and Block Kinematics in the East Tibetan Plateau

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Acta Geologica Sinica(English Edition) 2009年第4期83卷 694-712页

作者： ZHANG Yueqiao DONG Shuwen YANG Nong Key Laboratory of Neotectonic Movement and Geohazard Ministry of Land and Resources Beijing 100081 China Institute of Geomechanics Chinese Academy of Geological Sciences Beijing 100081 China Chinese Academy of Geological Sciences Beijing 100037 China

This paper examines major active faults and the present-day tectonic stress field in the East Tibetan Plateau by integrating available data from published literature and proposes a block kinematics model of the region. It shows that the East Tibetan Plateau is dominated by strike-slip and reverse faulting stress regimes and that the maximum horizontal stress is roughly consistent with the contemporary velocity field, except for the west Qinling range where it parallels the striking of the major strike-slip faults. Active tectonics in the East Tibetan Plateau is characterized by three faulting systems. The left-slip Kunlun-Qinling faulting system combines the east Kunlun fault zone, sinistral oblique reverse faults along the Minshan range and two major NEE-striking faults cutting the west Qinling range, which accommodates eastward motion, at 10--14 mm/a, of the Chuan-Qing block. The left-slip Xianshuihe faulting system accommodated clockwise rotation of the Chuan-Dian block. The Longmenshan thrust faulting system forms the eastern margin of the East Tibetan Plateau and has been propagated to the SW of the Sichuan basin. Crustal shortening across the Longmenshan range seems low （2-4 mm/a） and absorbed only a small part of the eastward motion of the Chuan-Qing block. Most of this eastward motion has been transmitted to South China, which is moving SEE-ward at 7-9 mm/a. It is suggested from geophysical data interpretation that the crust and lithosphere of the East Tibetan Plateau is considerably thickened and theologically layered. The upper crust seems to be decoupled from the lower crust through a decollement zone at a depth of 15-20 kin, which involved the Longmenshan fault belt and propagated eastward to the SW of the Sichuan basin. The Wenchuan earthquake was just formed at the bifurcated point of this decollement system. A rheological boundary should exist beneath the Longmenshan fault belt where the lower crust of the East Tibetan Plateau and the lithospheric man

关键词： Longmenshan fault belt active faulting pattern active tectonic stress field extrusion tectonics Wenchuan earthquake East Tibetan Plateau

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Geochronological Constraints for Boundary Shear Zones between Eastern Ghats Province and Bastar Craton: Implication for the Formation of Granulites and Their Exhumation History

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International Journal of Geosciences 2022年第8期13卷 593-608页

作者： Rajib Kar Miguel Angelo Stipp Basei Samarendra Bhattacharya Anwesha Ghosh Sanchari Chatterjee Department of Geology University of Calcutta Kolkata India Geoscience Institute Sao Paulo University Sao Paulo Brazil

Shear zones in the boundary between Eastern Ghats Province (EGP) and the cratons of Singhbhum in the north and Bastar in the west provide an excellent opportunity to study the tectonics of shear zone development and its timing in relation to the evolutionary history of the granulite suites. Detailed structural, microfabric and quartz C-axis patterns revealed a high temperature shear zone, at the western boundary between EGP and Bastar Craton (BC) around Paikmal. Petrological studies in this shear zone indicated decompression coeval with stretching in the sheared granulites. Geochronological constraints provided here indicate rapid exhumation of deep seated granulites in this boundary shear zone;the timing also is late in relation to the long-lived thermal (granulite formation) event in the EGP. Additionally, our geochronological data demonstrated the ~1600 Ma event in the Eastern Ghats Belt (EGB) involving sedimentation, magmatism, metamorphism and crustal anatexis, as a significant world event.

关键词： Shear Zone extrusion tectonics Exhumation Eastern Ghats Province Geochronology

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Conjugate strike-slip faulting along the Bangong-Nujiang suture zone accommodates coeval east-west extension and north-south shortening in the interior of the Tibetan Plateau

Conjugate strike-slip faulting along the Bangong-Nujiang sut...

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中国科学院地质与地球物理研究所2003学术年会

作者： Michael Taylor Frederick J.Ryerson Paul Kapp Department of Earth and Space Sciences University of California and Institute of Geophysics and Planetary PhysicsLos AngelesCaliforniaUSA Institute of Geophysics and Planetary Physics.Lawrence Livermore National Laboratory LivermoreCaliforniaUSA Department of Geosciences University of ArizonaTucson.ArizonaUSA

Geologic investigations of how the Tibetan plateau is currently deforming have focused primarily on its boundary ***,how the interior of the plateau deforms remains poorly *** fill this gap in knowledge,we conducted field mapping,analysis of remote sensing and digital topographic data,and reinterpretation of existing geologic maps in central *** study reveals a 200-300 km wide and 1500-1800 km long east trending zone of conjugate strike-slip faults across central *** central Tibet conjugate fault zone is comprised of northeast striking left-slip faults north of the Bangong-Nujiang suture and northwest striking right-slip faults(?)uth of the suture *** strike-slip faults are k(?)matically linked with north trending Tibetan rifts located north and south of the conjugate fault *** exception,all conjugate faults intersect or merge toward one another along the Bangong-Nujiang suture *** on these faults accommodates coeval east-west extension and north-south *** determine the fault kinematics and the magnitude of fault slip,we investigated three conjugate fault sets in the central Tibet fault zone. These include from east to vest,the Dong *** Co,and Aishi Co c(?)gate mult systems,which are adjacent to the Bangong-Nujiang suture zone and separated by a distance of 400 and 70 km, *** average magnitude of fault motion on individual strike-slip faults is～12 km as determined by offsets of Tertiary thrusts and Paleozoic-Mesozoic lithologic *** conjugate fault configuration requires 12 km of north-south contraction across the 200-300 km fault zone since its *** the conjugate strike-slip faults are kinematically linked with the north trending Tibetan rifts which initiated between 14 and 8 Ma,our estimated magnitude of north-south contraction implies a contraction rate of～1-2 mm/yr across central *** relatively closely spaced(<150 km) basins may result from a ser

关键词： conjugate strike-slip faults Tibet neotectonics extrusion tectonics

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