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Article: Collision leading to multiple-stage large-scale extrusion in the Qinling orogen: Insights from the Mianlue suture

TitleCollision leading to multiple-stage large-scale extrusion in the Qinling orogen: Insights from the Mianlue suture
Authors
KeywordsDeformation
Extrusion tectonics
Indentation tectonics
Mianlue suture
Qinling
Tectonic evolution
Issue Date2007
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jcr
Citation
Gondwana Research, 2007, v. 12 n. 1-2, p. 121-143 How to Cite?
AbstractThe geologic framework of the Phanerozoic Qinling-Dabie orogen was built up through two major suturing events of three blocks. From north to south these include the North China craton (including the north Qinling block), the Qinling-Dabie microblock, and the South China craton (including the Bikou block), separated by the Shangdan and Mianlue sutures. The Mianlue suture zone contains evidence for Mesozoic extrusion tectonics in the form of major strike-slip border faults surrounding basement blocks, a Late Paleozoic ophiolite and a ca. 240-200 Ma thrust belt that reformed by 200-150 Ma thrusts during A-type (intracontinental) subduction. The regional map pattern shows that the blocks are surrounded by complexly deformed Devonian to Early Triassic metasandstones and metapelites, forming a regional-scale block-in-matrix mélange fabric. Five distinct tectonic units have been recognized in the belt: (1) basement blocks including two types of Precambrian basement, crystalline and transitional; (2) continental margin slices including Early Paleozoic strata, and Late Paleozoic fluviodeltaic sedimentary rocks, proximal and distal fan clastics, reflecting the development of a north-facing rift margin on the edge of the South China plate; (3) out of sequence oceanic crustal slices including strongly deformed postrift, deep-water sedimentary rocks, sheeted dikes, basalts, and mafic-ultramafic cumulates of a Late Paleozoic ophiolite suite, developing independent of the rift margin in a separate basin; (4) out-of-sequence island-arc slices; (5) accretionary wedge slices. All the tectonic units were deformed during three geometrically distinct deformation episodes (D1, D2 and D3 during 240-200 Ma). Units 2-4 involved southward thrusting and vertical then southward extrusion of about 20 km of horizontal displacement above the autochthonous basement during the D1 episode. Thrust slices 20 km south of the Mianlue suture are related to this vertical extrusion due to the same rock assemblages, ages and kinematics. The D2 and D3 episodes folded all the units in a thick-skinned style about east-west (D2) and west-northwest (D3) axes in the Mianlue suture zone. An early foreland propagating sequence of accretion of Late Paleozoic rocks deposited above the Yangtze craton is not involved in D1 deformation but is temporally equivalent to the D2 and D3 deformation in the Mianlue suture. Two stages of strike-slip faulting mainly occurred at the end of D2 and D3, respectively. During D2 deformation, the Bikou block was obliquely indented to the ESE into the Mianlue suture, rather than being thrust over the Mianlue suture from the north as a part of the Qinling-Dabie microblock. During D3 deformation, however, the Bikou block was bounded by the south boundary fault of the Mianlue suture, and the Yangpingguan fault on the south. These faults are coeval strike-slip faults, but of opposite senses, and accommodated minor southwestward extrusion of the Bikou block into Songpan-Ganze orogen. The other basement blocks north of the Mianlue suture were extruded eastward by about 20 km of lateral displacement, based on the offset of the Wudang dome, during the D3 episode due to the northeastward indentation of the Hannan complex of the South China craton. Post-D3 emplacement of granite, cutting across the strike-slip faults such as the Mianlue suture, provides a minimum age of 200 Ma for D3 deformation. Therefore, based on insights from the evolution of the Mianlue suture, the D2 and D3 episodes in the Mianlue suture and its neighbors are not responsible for and associated with the two-stage extrusion of the Dabie UHP-HP terranes from the Foping dome to the present erosional surface (more than 350 km). © 2006 International Association for Gondwana Research.
Persistent Identifierhttp://hdl.handle.net/10722/72816
ISSN
2015 Impact Factor: 8.743
2015 SCImago Journal Rankings: 4.949
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLi, Sen_HK
dc.contributor.authorKusky, TMen_HK
dc.contributor.authorWang, Len_HK
dc.contributor.authorZhang, Gen_HK
dc.contributor.authorLai, Sen_HK
dc.contributor.authorLiu, Xen_HK
dc.contributor.authorDong, Sen_HK
dc.contributor.authorZhao, Gen_HK
dc.date.accessioned2010-09-06T06:45:22Z-
dc.date.available2010-09-06T06:45:22Z-
dc.date.issued2007en_HK
dc.identifier.citationGondwana Research, 2007, v. 12 n. 1-2, p. 121-143en_HK
dc.identifier.issn1342-937Xen_HK
dc.identifier.urihttp://hdl.handle.net/10722/72816-
dc.description.abstractThe geologic framework of the Phanerozoic Qinling-Dabie orogen was built up through two major suturing events of three blocks. From north to south these include the North China craton (including the north Qinling block), the Qinling-Dabie microblock, and the South China craton (including the Bikou block), separated by the Shangdan and Mianlue sutures. The Mianlue suture zone contains evidence for Mesozoic extrusion tectonics in the form of major strike-slip border faults surrounding basement blocks, a Late Paleozoic ophiolite and a ca. 240-200 Ma thrust belt that reformed by 200-150 Ma thrusts during A-type (intracontinental) subduction. The regional map pattern shows that the blocks are surrounded by complexly deformed Devonian to Early Triassic metasandstones and metapelites, forming a regional-scale block-in-matrix mélange fabric. Five distinct tectonic units have been recognized in the belt: (1) basement blocks including two types of Precambrian basement, crystalline and transitional; (2) continental margin slices including Early Paleozoic strata, and Late Paleozoic fluviodeltaic sedimentary rocks, proximal and distal fan clastics, reflecting the development of a north-facing rift margin on the edge of the South China plate; (3) out of sequence oceanic crustal slices including strongly deformed postrift, deep-water sedimentary rocks, sheeted dikes, basalts, and mafic-ultramafic cumulates of a Late Paleozoic ophiolite suite, developing independent of the rift margin in a separate basin; (4) out-of-sequence island-arc slices; (5) accretionary wedge slices. All the tectonic units were deformed during three geometrically distinct deformation episodes (D1, D2 and D3 during 240-200 Ma). Units 2-4 involved southward thrusting and vertical then southward extrusion of about 20 km of horizontal displacement above the autochthonous basement during the D1 episode. Thrust slices 20 km south of the Mianlue suture are related to this vertical extrusion due to the same rock assemblages, ages and kinematics. The D2 and D3 episodes folded all the units in a thick-skinned style about east-west (D2) and west-northwest (D3) axes in the Mianlue suture zone. An early foreland propagating sequence of accretion of Late Paleozoic rocks deposited above the Yangtze craton is not involved in D1 deformation but is temporally equivalent to the D2 and D3 deformation in the Mianlue suture. Two stages of strike-slip faulting mainly occurred at the end of D2 and D3, respectively. During D2 deformation, the Bikou block was obliquely indented to the ESE into the Mianlue suture, rather than being thrust over the Mianlue suture from the north as a part of the Qinling-Dabie microblock. During D3 deformation, however, the Bikou block was bounded by the south boundary fault of the Mianlue suture, and the Yangpingguan fault on the south. These faults are coeval strike-slip faults, but of opposite senses, and accommodated minor southwestward extrusion of the Bikou block into Songpan-Ganze orogen. The other basement blocks north of the Mianlue suture were extruded eastward by about 20 km of lateral displacement, based on the offset of the Wudang dome, during the D3 episode due to the northeastward indentation of the Hannan complex of the South China craton. Post-D3 emplacement of granite, cutting across the strike-slip faults such as the Mianlue suture, provides a minimum age of 200 Ma for D3 deformation. Therefore, based on insights from the evolution of the Mianlue suture, the D2 and D3 episodes in the Mianlue suture and its neighbors are not responsible for and associated with the two-stage extrusion of the Dabie UHP-HP terranes from the Foping dome to the present erosional surface (more than 350 km). © 2006 International Association for Gondwana Research.en_HK
dc.languageengen_HK
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jcren_HK
dc.relation.ispartofGondwana Researchen_HK
dc.subjectDeformationen_HK
dc.subjectExtrusion tectonicsen_HK
dc.subjectIndentation tectonicsen_HK
dc.subjectMianlue sutureen_HK
dc.subjectQinlingen_HK
dc.subjectTectonic evolutionen_HK
dc.titleCollision leading to multiple-stage large-scale extrusion in the Qinling orogen: Insights from the Mianlue sutureen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1342-937X&volume=12&spage=121&epage=143&date=2007&atitle=Collision+leading+to+multiple-stage+large-scale+extrusion+in+the+Qinling+orogen:+Insights+from+the+Mianlue+sutureen_HK
dc.identifier.emailZhao, G:gzhao@hkucc.hku.hken_HK
dc.identifier.authorityZhao, G=rp00842en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.gr.2006.11.011en_HK
dc.identifier.scopuseid_2-s2.0-34250895524en_HK
dc.identifier.hkuros144327en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-34250895524&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume12en_HK
dc.identifier.issue1-2en_HK
dc.identifier.spage121en_HK
dc.identifier.epage143en_HK
dc.identifier.isiWOS:000248283100010-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridLi, S=8784176300en_HK
dc.identifier.scopusauthoridKusky, TM=35234213100en_HK
dc.identifier.scopusauthoridWang, L=49261271600en_HK
dc.identifier.scopusauthoridZhang, G=35085644800en_HK
dc.identifier.scopusauthoridLai, S=7402937299en_HK
dc.identifier.scopusauthoridLiu, X=34975560500en_HK
dc.identifier.scopusauthoridDong, S=7402017108en_HK
dc.identifier.scopusauthoridZhao, G=7403296321en_HK

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