Oceanic plateau subduction during closure of the Bangong-Nujiang Tethyan Ocean: Insights from central Tibetan volcanic rocks

doi:10.1130/B32045.1

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 岩石圈演化国家重点实验室

	Oceanic plateau subduction during closure of the Bangong-Nujiang Tethyan Ocean: Insights from central Tibetan volcanic rocks
	Hao, Lu-Lu 1,2; Wang, Qiang 1,2,3; Zhang, Chunfu 4; Ou, Quan 1,2; Yang, Jin-Hui 5; Dan, Wei 1,3; Jiang, Zi-Qi 6
刊名	GEOLOGICAL SOCIETY OF AMERICA BULLETIN
	2019-05-01
卷号	131 期号:5-6 页码:864-880
ISSN号	0016-7606
DOI	10.1130/B32045.1
英文摘要	Identification of arc magmatic rock associations in a subduction zone has important implications for specifically revealing the geodynamic evolution of the subduction system. The closure time of the Bangong-Nujiang Tethyan Ocean and the detailed subduction processes have been hotly debated, hindering our understanding of the tectonic evolution of central Tibet. Here, we investigated the ca. 110-104 Ma Gerze lavas (basalts, basaltic andesites, andesites, dacites, and rhyolites) in southern Qiangtang. Fusion of slab fluid-metasomatized mantle wedge could yield the basalts, and such basaltic magmas, if contaminated with ancient basement orthogneisses, could have formed the andesites. The basaltic andesites with high Nb and Nb/La are similar to the Nb-enriched arc basalts and probably originated from slab melt-metasomatized mantle. The dacites were generated by fractional crystallization of the subducted melange-derived intermediate magmas. The rhyolites have geochemical characteristics (high SiO2 and La/Yb; low MgO and Sr/Y) similar to those of Jamaican-type adakites and were possibly sourced from the subducted oceanic plateau at low pressures. The Gerze Jamaican-type adakites and Nb-enriched basalt association could imply intense slab-mantle interactions. The Gerze lava suites show clear arc affinities, indicating that oceanic subduction may have lasted until 100 Ma. Based on previous studies and a noticeable ca. 145-125 Ma magmatic lull in southern Qiangtang, we suggest that the Bangong-Nujiang oceanic subduction geodynamics involved normal subduction (170-145 Ma), flat subduction (145-125 Ma), and slab roll-back (125-101 Ma). Moreover, the flat subduction was most likely caused by subduction of the oceanic plateau. Therefore, we propose, for the first time, that Tethyan oceanic plateau subduction during the Early Cretaceous could explain the tectonic evolution of the Bangong-Nujiang Ocean and distinctive magmatism in southern Qiangtang, central Tibet.
资助项目	National Key R&D Program of China[2016YFC0600407] ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences[XDA2007030402] ; National Natural Science Foundation of China[41630208] ; National Natural Science Foundation of China[41573027] ; Key Program of the Chinese Academy of Sciences[QYZDJ-SSW-DQC026] ; Talent Project of Guangdong Province[2014TX01Z079] ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS) 135 project[135TP201601] ; China Postdoctoral Science Foundation[2017M620263]
WOS关键词	STRENGTH ELEMENT ENRICHMENT ; HF ISOTOPIC COMPOSITIONS ; SLAB-DERIVED MELTS ; U-PB GEOCHRONOLOGY ; CU-AU DEPOSIT ; SOUTHERN QIANGTANG ; RIDGE SUBDUCTION ; TECTONIC EVOLUTION ; INTRUSIVE ROCKS ; FLAT SUBDUCTION
WOS研究方向	Geology
语种	英语
出版者	GEOLOGICAL SOC AMER, INC
WOS记录号	WOS:000466511700009
资助机构	National Key R&D Program of China ; National Key R&D Program of China ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Program of the Chinese Academy of Sciences ; Key Program of the Chinese Academy of Sciences ; Talent Project of Guangdong Province ; Talent Project of Guangdong Province ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS) 135 project ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS) 135 project ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Key R&D Program of China ; National Key R&D Program of China ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Program of the Chinese Academy of Sciences ; Key Program of the Chinese Academy of Sciences ; Talent Project of Guangdong Province ; Talent Project of Guangdong Province ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS) 135 project ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS) 135 project ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Key R&D Program of China ; National Key R&D Program of China ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Program of the Chinese Academy of Sciences ; Key Program of the Chinese Academy of Sciences ; Talent Project of Guangdong Province ; Talent Project of Guangdong Province ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS) 135 project ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS) 135 project ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Key R&D Program of China ; National Key R&D Program of China ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Program of the Chinese Academy of Sciences ; Key Program of the Chinese Academy of Sciences ; Talent Project of Guangdong Province ; Talent Project of Guangdong Province ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS) 135 project ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS) 135 project ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/91485]
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.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China 2.Univ Chinese Acad Sci, Beijing 10069, Peoples R China 3.Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China 4.Ft Hays State Univ, Dept Geosci, Hays, KS 67601 USA 5.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 6.Guilin Univ Technol, Sch Earth Sci, Guilin 541004, Peoples R China
推荐引用方式 GB/T 7714	Hao, Lu-Lu,Wang, Qiang,Zhang, Chunfu,et al. Oceanic plateau subduction during closure of the Bangong-Nujiang Tethyan Ocean: Insights from central Tibetan volcanic rocks[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2019,131(5-6):864-880.
APA	Hao, Lu-Lu.,Wang, Qiang.,Zhang, Chunfu.,Ou, Quan.,Yang, Jin-Hui.,...&Jiang, Zi-Qi.(2019).Oceanic plateau subduction during closure of the Bangong-Nujiang Tethyan Ocean: Insights from central Tibetan volcanic rocks.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,131(5-6),864-880.
MLA	Hao, Lu-Lu,et al."Oceanic plateau subduction during closure of the Bangong-Nujiang Tethyan Ocean: Insights from central Tibetan volcanic rocks".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 131.5-6(2019):864-880.