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Transition from oceanic to continental lithosphere subduction in southern Tibet: Evidence from the Late Cretaceous-Early Oligocene (similar to 91-30 Ma) intrusive rocks in the Chanang-Zedong area, southern Gangdese
Jiang, ZQ; Wang, Q; Wyman, DA; Li, ZX; Yang, JH; Shi, XB; Ma, L; Tang, GJ; Gou, GN; Jia, XH; Guo, HF; wqiang@gig.ac.cn
2014
Source PublicationLITHOS
ISSN0024-4937
Volume196Pages:213-231
AbstractLittle is known about the detailed processes associated with the transition from oceanic to continental lithosphere subduction in the Gangdese Belt of southern Tibet (GBST). Here, we report zircon U-Pb age, major and trace element and Sr-Nd-Hf isotopic data for Late Cretaceous-Early Oligocene (similar to 91-30 Ma) intermediate-acid intrusive rocks in the Chanang-Zedong area immediately north of the Yarlung-Tsangpo suture zone. These rocks represent five magmatic episodes at similar to 91, similar to 77, similar to 62, similar to 48, and similar to 30 Ma, respectively. The 91-48 Ma rocks have slightly lower initial Sr-87/Sr-86 (0.7037 to 0.7047), and higher epsilon(Nd)(t) (+1.8 to +4.3) and epsilon(Hf)(t) (+3.5 to +14.7) values in comparison with those (0.7057 to 0.7062, -3.3 to -2.5 and +2.2 to +6.6) of the similar to 30 Ma intrusive rocks. The similar to 91, similar to 62 and similar to 30 Ma rocks are geochemically similar to slab-derived adakites. The similar to 91 Ma Somka adakitic granodiorites were likely derived by partial melting of the subducting Neo-Tethyan oceanic crust with minor oceanic sediments, and the similar to 91 Ma Somka dioritic rocks with a geochemical affinity of adakitic magnesian andesites likely resulted from interactions between adakitic magmas and overlying mantle wedge peridotite. The similar to 77 Ma Luomu diorites were probably generated by partial melting of juvenile basaltic lower crust. The similar to 62 Ma Naika and Zedong adaldtic diorites and granodiorites were likely generated mainly by partial melting of thickened juvenile mafic lower crust but the source region of the Zedong adakitic rocks also contained enriched components corresponding to Indian continental crust. The similar to 48 Ma Lamda granites were possibly generated by melting of a juvenile basaltic crust. The younger (similar to 30 Ma) Chongmuda adakitic quartz monzonites and minor granodiorites were most probably derived by partial melting of Early Oligocene north-ward-subducted Indian lower crust beneath the southern Lhasa Block. Taking into account the regional tectonic and magmatic data, we suggest that the Gangdese Belt of southern Tibet (GBST) underwent a tectonodynamic transition from oceanic subduction to continental subduction between 100 and 30 Ma. It evolved through four stages: 100-65 Ma roll-back of subducted Neo-Tethyan oceanic lithosphere; 65-60 Ma initial collision between Indian and Asian continents; 60-40 Ma breakoff of subducted Neo-Tethyan oceanic lithosphere; and similar to 30 Ma northward subduction of the Indian continent (C) 2014 Elsevier B.V. All rights reserved.
Department[Jiang, Zi-Qi ; Wang, Qiang ; Ma, Lin ; Tang, Gong-Jian ; Gou, Guo-Ning ; Jia, Xiao-Hui ; Guo, Hai-Feng] Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China ; [Jiang, Zi-Qi ; Shi, Xiao-Bing] Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China ; [Wyman, Derek A.] Univ Sydney, Sch Geosci, Sydney, NSW 2006, Australia ; [Li, Zheng-Xiang] Curtin Univ, ARC Ctr Excellence Core Crust Fluid Syst CCFS, Dept Appl Geol, Perth, WA 6845, Australia ; [Li, Zheng-Xiang] Curtin Univ, Inst Geosci Res TIGeR, Dept Appl Geol, Perth, WA 6845, Australia ; [Yang, Jin-Hui] Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
KeywordAdakites Oceanic Subduction Continental Collision Slab Breakoff Continental Subduction Southern Tibet
Subject AreaGeochemistry & Geophysics ; Mineralogy
Funding OrganizationChinese Academy of Sciences [XDB03010600]; National Natural Science Foundation of China [41025006, 41121002, 41202040]; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 project) [Y234021001] ; Chinese Academy of Sciences [XDB03010600]; National Natural Science Foundation of China [41025006, 41121002, 41202040]; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 project) [Y234021001] ; Chinese Academy of Sciences [XDB03010600]; National Natural Science Foundation of China [41025006, 41121002, 41202040]; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 project) [Y234021001] ; Chinese Academy of Sciences [XDB03010600]; National Natural Science Foundation of China [41025006, 41121002, 41202040]; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 project) [Y234021001]
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Indexed Bysci
Funding Project海洋地质
Funding OrganizationChinese Academy of Sciences [XDB03010600]; National Natural Science Foundation of China [41025006, 41121002, 41202040]; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 project) [Y234021001] ; Chinese Academy of Sciences [XDB03010600]; National Natural Science Foundation of China [41025006, 41121002, 41202040]; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 project) [Y234021001] ; Chinese Academy of Sciences [XDB03010600]; National Natural Science Foundation of China [41025006, 41121002, 41202040]; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 project) [Y234021001] ; Chinese Academy of Sciences [XDB03010600]; National Natural Science Foundation of China [41025006, 41121002, 41202040]; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 project) [Y234021001]
WOS IDWOS:000336347800015
Citation statistics
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/10626
Collection中科院边缘海地质重点实验室
Corresponding Authorwqiang@gig.ac.cn
Recommended Citation
GB/T 7714
Jiang, ZQ,Wang, Q,Wyman, DA,et al. Transition from oceanic to continental lithosphere subduction in southern Tibet: Evidence from the Late Cretaceous-Early Oligocene (similar to 91-30 Ma) intrusive rocks in the Chanang-Zedong area, southern Gangdese[J]. LITHOS,2014,196:213-231.
APA Jiang, ZQ.,Wang, Q.,Wyman, DA.,Li, ZX.,Yang, JH.,...&wqiang@gig.ac.cn.(2014).Transition from oceanic to continental lithosphere subduction in southern Tibet: Evidence from the Late Cretaceous-Early Oligocene (similar to 91-30 Ma) intrusive rocks in the Chanang-Zedong area, southern Gangdese.LITHOS,196,213-231.
MLA Jiang, ZQ,et al."Transition from oceanic to continental lithosphere subduction in southern Tibet: Evidence from the Late Cretaceous-Early Oligocene (similar to 91-30 Ma) intrusive rocks in the Chanang-Zedong area, southern Gangdese".LITHOS 196(2014):213-231.
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