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Midcrustal shearing and doming in a Cenozoic compressive setting along the Ailao Shan-Red River shear zone
Zhang, B (Zhang, B.)1; Yin, CY (Yin, C. Y.)1; Zhang, JJ (Zhang, J. J.)1; Wang, JM (Wang, J. M.)2; Zhong, DL (Zhong, D. L.)2; Wang, Y (Wang, Y.)1; Lai, QZ (Lai, Q. Z.)3; Yue, YH (Yue, Y. H.)3; Zhou, QY (Zhou, Q. Y.)4; Zhang, B
Source PublicationGEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
2017
Volume18Issue:1Pages:400-433
DOI10.1002/2016GC006520
AbstractThe Cenozoic Xuelong Shan antiformal dome is located along the northern segment of the Ailao Shan-Red River shear zone in Yunnan, China. Subhorizontal foliation in the gneiss core is recognized, representing a broad top-to-NE shear initiated under amphibolite facies conditions and propagating into greenschist facies in the mantling schist and strike-slip shear zone. Microfabrics of crystallographic-preferred orientations (CPOs) in quartz suggest that the deformation temperatures increased with increasing structural depth from the upper crust (300-500 degrees C) in the mantling schist to the midcrust (15 km or more, 650 degrees C) in the gneissic core. This trend is mirrored by variations in the metamorphic grade of the syn-kinematic mineral assemblages and microstructures, which range from garnet+amphibole+biotite+sillimanite+rutile+feldspar in the core to garnet+staurolite+biotite+epidote+muscovite within the limb units. The dome experienced the following deformation history: (1) a broad top-to-NE shear in the subhorizontal foliation of the gneiss core during the first stage of deformation (D1); (2) opposing reverse-sense shear along the two schist limbs of the dome during contraction-related doming (D2-D3); (3) sinistral strike-slip shearing within the eastern limb (D4); and (4) extensional deformation (D5). The structural-thermal patterns suggest the antiformal dome formation was roughly coeval with top-to-NE ductile shearing in the midcrust of Tibet at 32 Ma or earlier. A major implication is that there was a phase of contractional ductile deformation in the region prior to the initiation of strike-slip deformation.
Subject Area地质学
WOS IDWOS:000395186600023
Language英语
Indexed BySCI
KeywordMETAMORPHIC CORE COMPLEXES INDIA-ASIA COLLISION SOUTHERN TIBET GNEISS DOMES SE ASIA PREFERRED ORIENTATIONS DETACHMENT FAULTS AR-40/AR-39 GEOCHRONOLOGY DEFORMATION TEMPERATURES CONTINENTAL EXTRUSION
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics ; Geochemistry & Geophysics
Cooperation Status国内
Citation statistics
Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/8393
Collection图书馆
Corresponding AuthorZhang, B
Affiliation1.Peking Univ, Sch Earth & Space Sci, Key Lab Orogen Belts & Crustal Evolut, Beijing, Peoples R China.
2.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China.
3.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing, Peoples R China.
4.Earthquake Adm Yunnan Prov, Kunming, Peoples R China.
Recommended Citation
GB/T 7714
Zhang, B ,Yin, CY ,Zhang, JJ ,et al. Midcrustal shearing and doming in a Cenozoic compressive setting along the Ailao Shan-Red River shear zone[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2017,18(1):400-433.
APA Zhang, B .,Yin, CY .,Zhang, JJ .,Wang, JM .,Zhong, DL .,...&Zhang, B.(2017).Midcrustal shearing and doming in a Cenozoic compressive setting along the Ailao Shan-Red River shear zone.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,18(1),400-433.
MLA Zhang, B ,et al."Midcrustal shearing and doming in a Cenozoic compressive setting along the Ailao Shan-Red River shear zone".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 18.1(2017):400-433.
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