IGGCAS OpenIR  > 矿产资源研究院重点实验室
Tectonic evolution of the Tianshan Akeyazi metamorphic complex (NW China)
Bayet, Lea1,2; Agard, Philippe2; John, Timm1; Menneken, Martina1,3; Tan, Zhou2,4; Gao, Jun4
2020-02-01
Source PublicationLITHOS
ISSN0024-4937
Volume354Pages:24
AbstractThe South Tianshan orogen (northwest China) comprises a thick volcanoclastic HP-UHP metamorphic belt, the Akeyazi (high-pressure) metamorphic complex (AMC), exhibiting well-preserved eclogite- and blueschist-facies rocks and pervasive deformation throughout all units. In order to clarify the tectonic evolution of this fossil subduction zone, which remains controversial due to the lack of systematic field observations combining structural and petrological data, we herein present the results of extensive mapping of lithologies, deformation patterns and petrological evolutions. The AMC is composed of a high-pressure (HP) to ultra-high-pressure (UHP) central domain - the HP-UHP unit - separated in the North by a major detachment from a greenschist-facies domain. A gradational transition in lithologies (i.e., interlayered micaschists, volcanoclastic, and mafic rocks) is observed within the HP-UHP unit, from more pelitic in the North to more mafic in the South. Tectonic patterns and contrasting lithologies allow to recognize five distinct sub-units stacked at HP to UHP conditions. Pervasive ductile deformation revealed by penetrative schistosities, folding, shear planes and boudinage structures is characterized by successive deformation stages which are attributed to burial (Dn-1), peak deformation accompanying detachment from the slab and/or deep nappe stacking (D-n, Dn+1) and exhumation (Dn+2, Dn+3). During exhumation under blueschist-facies conditions, the HP-UHP nappe stack underwent pervasive shearing, in particular across km-scale extensional shear zones with consistent top to the north shear senses reworking inherited thrust contacts. The entire HP-UHP unit reached peak-metamorphic conditions at similar to 2.5 GPa and similar to 540 degrees C. Peak pressures of 2.52 +/- 0.25 GPa, consistent with the widespread occurrence of coesite in the HP-UHP unit, suggest a maximum burial depth of similar to 80 km which is thought to reflect a transition between mechanical coupling and decoupling at the plate interface. This tectono-metamorphic evolution is set back in a tentative geodynamic model. (C) 2019 Elsevier B.V. All rights reserved.
KeywordTianshan Exhumation HP-UHP Metamorphic belt Subduction Interface
DOI10.1016/j.lithos.2019.105273
Funding OrganizationZIP project (REA grant (ZIP "Zooming In between Plates") from the People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme FP7/2007-2013) ; ZIP project (REA grant (ZIP "Zooming In between Plates") from the People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme FP7/2007-2013) ; ZIP project (REA grant (ZIP "Zooming In between Plates") from the People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme FP7/2007-2013) ; ZIP project (REA grant (ZIP "Zooming In between Plates") from the People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme FP7/2007-2013) ; ZIP project (REA grant (ZIP "Zooming In between Plates") from the People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme FP7/2007-2013) ; ZIP project (REA grant (ZIP "Zooming In between Plates") from the People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme FP7/2007-2013) ; ZIP project (REA grant (ZIP "Zooming In between Plates") from the People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme FP7/2007-2013) ; ZIP project (REA grant (ZIP "Zooming In between Plates") from the People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme FP7/2007-2013)
WOS KeywordCONVERGENT PLATE MARGINS ; SUBDUCTION-CHANNEL MODEL ; ASIAN OROGENIC BELT ; P-T EVOLUTION ; HP-LT ROCKS ; SOUTH TIANSHAN ; WESTERN TIANSHAN ; SOUTHWESTERN TIANSHAN ; CONTINENTAL-CRUST ; ACCRETIONARY COMPLEX
Language英语
Funding ProjectZIP project (REA grant (ZIP "Zooming In between Plates") from the People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme FP7/2007-2013)[604713]
Funding OrganizationZIP project (REA grant (ZIP "Zooming In between Plates") from the People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme FP7/2007-2013) ; ZIP project (REA grant (ZIP "Zooming In between Plates") from the People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme FP7/2007-2013) ; ZIP project (REA grant (ZIP "Zooming In between Plates") from the People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme FP7/2007-2013) ; ZIP project (REA grant (ZIP "Zooming In between Plates") from the People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme FP7/2007-2013) ; ZIP project (REA grant (ZIP "Zooming In between Plates") from the People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme FP7/2007-2013) ; ZIP project (REA grant (ZIP "Zooming In between Plates") from the People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme FP7/2007-2013) ; ZIP project (REA grant (ZIP "Zooming In between Plates") from the People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme FP7/2007-2013) ; ZIP project (REA grant (ZIP "Zooming In between Plates") from the People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme FP7/2007-2013)
WOS Research AreaGeochemistry & Geophysics ; Mineralogy
WOS SubjectGeochemistry & Geophysics ; Mineralogy
WOS IDWOS:000514217200040
PublisherELSEVIER
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Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/95585
Collection矿产资源研究院重点实验室
Corresponding AuthorAgard, Philippe
Affiliation1.Free Univ Berlin, Inst Geol Wissensch, Malteserstr 74-100, D-12449 Berlin, Germany
2.Sorbonne Univ, ISTEP, UMR CNRS 7193, F-75005 Paris, France
3.Univ Bonn, Inst Geowissensch, Meckenheimer Allee 171, D-53115 Bonn, Germany
4.Chinese Acad Sci, Inst Geol & Geophys, POB 9825, Beijing 100029, Peoples R China
Recommended Citation
GB/T 7714
Bayet, Lea,Agard, Philippe,John, Timm,et al. Tectonic evolution of the Tianshan Akeyazi metamorphic complex (NW China)[J]. LITHOS,2020,354:24.
APA Bayet, Lea,Agard, Philippe,John, Timm,Menneken, Martina,Tan, Zhou,&Gao, Jun.(2020).Tectonic evolution of the Tianshan Akeyazi metamorphic complex (NW China).LITHOS,354,24.
MLA Bayet, Lea,et al."Tectonic evolution of the Tianshan Akeyazi metamorphic complex (NW China)".LITHOS 354(2020):24.
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