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Post-collisional crustal thickening and plateau uplift of southern Tibet: Insights from Cenozoic magmatism in the Wuyu area of the eastern Lhasa block

文献类型：期刊论文

作者Hao, Lu-Lu4,5; Wang, Qiang2,4,6; Kerr, Andrew C.1; Yang, Jin-Hui3; Ma, Lin4; Qi, Yue4; Wang, Jun4; Ou, Quan4
刊名GEOLOGICAL SOCIETY OF AMERICA BULLETIN
出版日期2021-07-01
卷号133期号:7-8页码:1634-1648
ISSN号0016-7606
DOI10.1130/B35659.1
英文摘要The nature and timing of post-collisional crustal thickening and its link to surface up-lift in the eastern Lhasa block of the southern Tibetan plateau remain controversial. Here we report on Cenozoic magmatism in the Wuyu area of the eastern Lhasa block. The Eocene (ca. 46 Ma) trachyandesites and trachydacites show slight fractionation of rare earth elements (REE), slightly negative Eu and Sr anomalies, and relatively homogeneous Sr-Nd and zircon Hf isotopes (Sr-87/Sr-86(i) = 0.7050-0.7063, epsilon Nd(t) = -0.92 to -0.03, epsilon Hf(t) = +2.6 to +4.8). Previous studies have suggested Neo-Tethys oceanic slab break-off at 50-45 Ma; thus, the Wuyu Eocene magmatism could represent a magmatic response to this slab break-off and originate from relatively juvenile Lhasa crust. The Miocene (ca. 15-12 Ma) dacites and rhyolites have adakitic affinities, e.g., high Sr (average 588 ppm), Sr/Y (29-136), and La/Yb (30-76) values, low Y (4-12 ppm) and Yb (0.4-0.9 ppm) contents, and variable Sr-Nd and zircon Hf isotopes (Sr-87/Sr-86(i) = 0.7064-0.7142, epsilon Nd(t) = -11.7 to -3.7, epsilon Hf(t) = -3.2 to +4.5). Their more enriched Sr-Nd-Hf isotopes relative to the Eocene lavas indicate that they should be derived from mixed Lhasa lower crust comprising juvenile crust, ultrapotassic rocks, and probably Indian lower crustderived rocks. This study has also revealed the transformation from Eocene juvenile and thin crust with a thickness of <40 km to Miocene mixed and thickened crust with a thickness of >50 km. Combined with published tectonic data, we suggest that both lithospheric shortening and magma underplating contributed to eastern Lhasa block post-collisional crustal thickening. Given the spatial-temporal distribution of eastern Lhasa block magmatism and regional geology, we invoke a post-collisional tectonic model of steep subduction of the Indian plate and subsequent westward-propagating plate break-off beneath the eastern Lhasa block, which caused the surface uplift.
WOS关键词LINZIZONG VOLCANIC SUCCESSIONS ; INDIAN CONTINENTAL SUBDUCTION ; PB-O ; ULTRAPOTASSIC MAGMATISM ; GEOCHEMICAL CONSTRAINTS ; CONVECTIVE INSTABILITY ; ISOTOPIC CONSTRAINTS ; TECTONIC EVOLUTION ; SOUTHWESTERN TIBET ; GANGDESE MOUNTAINS
资助项目Second Tibetan Plateau Scientific Expedition and Research (STEP)[2019QZKK0702] ; National Natural Science Foundation of China[41630208] ; National Natural Science Foundation of China[41802048] ; National Natural Science Foundation of China[91855215] ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences[XDA2007030402] ; Key Program of the Chinese Academy of Sciences[QYZDJ-SSW-DQC026] ; National Key R and D Program of China[2016YFC0600407] ; Key Program of Guangzhou City[201604910124] ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences[135TP201601]
WOS研究方向Geology
语种英语
WOS记录号WOS:000672732700016
出版者GEOLOGICAL SOC AMER, INC
资助机构Second Tibetan Plateau Scientific Expedition and Research (STEP) ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; Key Program of the Chinese Academy of Sciences ; Key Program of the Chinese Academy of Sciences ; National Key R and D Program of China ; National Key R and D Program of China ; Key Program of Guangzhou City ; Key Program of Guangzhou City ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; Key Program of the Chinese Academy of Sciences ; Key Program of the Chinese Academy of Sciences ; National Key R and D Program of China ; National Key R and D Program of China ; Key Program of Guangzhou City ; Key Program of Guangzhou City ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; Key Program of the Chinese Academy of Sciences ; Key Program of the Chinese Academy of Sciences ; National Key R and D Program of China ; National Key R and D Program of China ; Key Program of Guangzhou City ; Key Program of Guangzhou City ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; Key Program of the Chinese Academy of Sciences ; Key Program of the Chinese Academy of Sciences ; National Key R and D Program of China ; National Key R and D Program of China ; Key Program of Guangzhou City ; Key Program of Guangzhou City ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences
源URL[http://ir.iggcas.ac.cn/handle/132A11/101961]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Wang, Qiang
作者单位1.Cardiff Univ, Sch Earth & Ocean Sci, Cardiff CF10 3AT, Wales
2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
4.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China
5.Univ Sci & Technol China, Chinese Acad Sci, Sch Earth & Space Sci, Key Lab Crust Mantle Mat & Environm, Hefei 230026, Peoples R China
6.Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
推荐引用方式
GB/T 7714		 Hao, Lu-Lu,Wang, Qiang,Kerr, Andrew C.,et al. Post-collisional crustal thickening and plateau uplift of southern Tibet: Insights from Cenozoic magmatism in the Wuyu area of the eastern Lhasa block[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2021,133(7-8):1634-1648.
APA Hao, Lu-Lu.,Wang, Qiang.,Kerr, Andrew C..,Yang, Jin-Hui.,Ma, Lin.,...&Ou, Quan.(2021).Post-collisional crustal thickening and plateau uplift of southern Tibet: Insights from Cenozoic magmatism in the Wuyu area of the eastern Lhasa block.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,133(7-8),1634-1648.
MLA Hao, Lu-Lu,et al."Post-collisional crustal thickening and plateau uplift of southern Tibet: Insights from Cenozoic magmatism in the Wuyu area of the eastern Lhasa block".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 133.7-8(2021):1634-1648.

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