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DOI	10.1016/j.jseaes.2023.105575
	Identification and origin of the Late Oligocene to Miocene pyroclastic rocks in the Lunpola Basin and link with deep geodynamics in the Lhasa terrane, Tibetan Plateau
	Mao, Ziqiang; Fang, Xiaomin; Yang, Yibo; Ye, Chengcheng; Zhang, Weilin; Zhang, Tao; Christidis, George E.
发表日期	2023
ISSN	1367-9120
EISSN	1878-5786
卷号	247
英文摘要	Tephrochronology provides a powerful tool to date and correlate the sedimentary sequence. However, the recognition of tuff and tuffinite in Cenozoic sequences is challengeable because of modification and alteration during diagenesis. In this contribution, we studied samples from the Cenozoic Lunpola basin on the central Tibetan Plateau to explore the potential provenance and distinction of pyroclastic materials from clastic sediments and to recognize the source-to-sink process of pyroclastic rocks and their deep geodynamic implications. The bulk mineralogical compositions and major and trace elements and Sr-Nd-Hf isotopic compositions of the pyroclastic rocks and clastic sediments in the Lunpola Basin were determined and compared with those of contemporary volcanic rocks in the Lhasa terrane. It is suggested that Th/U-Rb/Sr and (La/Yb)N-Na2O/Al2O3 discrimination plots might be used to distinguish pyroclastic from clastic sedimentary rocks in terms of source, transportation and diagenesis. According to the trace element and Sr-Nd and Hf isotope signatures, the 23.5 Ma pyroclastic rocks in the Lunpola Basin may originate from the Xungba ultrapotassic magmatism, and the - 21-15 Ma pyroclastic rocks may have been supplied by corresponding adakitic magmatism. The spatial distributions of the ultrapotassic and potassic as well as adakitic volcanic rocks in the Lhasa terrane may reveal that the west Lhasa terrane mantle lithosphere was detached and the east Lhasa terrane lower crust was thickened along with the India-Asia plate convergence.
关键词	Tuff layer Provenance Subduction India -Asian collision
英文关键词	CONTINENTAL COLLISION; SOUTH TIBET; ULTRAPOTASSIC MAGMATISM; CENOZOIC MAGMATISM; MAFIC MAGMATISM; NORTHERN TIBET; TRACE-ELEMENT; MANTLE SOURCE; UPLIFT; EVOLUTION
WOS研究方向	Geosciences, Multidisciplinary
WOS记录号	WOS:000961904700001
来源期刊	JOURNAL OF ASIAN EARTH SCIENCES
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283833
作者单位	Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Chinese Academy of Sciences; Institute of Tibetan Plateau Research, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Shanghai Normal University; Lanzhou University; Lanzhou University; Technical University of Crete
推荐引用方式 GB/T 7714	Mao, Ziqiang,Fang, Xiaomin,Yang, Yibo,et al. Identification and origin of the Late Oligocene to Miocene pyroclastic rocks in the Lunpola Basin and link with deep geodynamics in the Lhasa terrane, Tibetan Plateau[J]. 中国科学院青藏高原研究所,2023,247.
APA	Mao, Ziqiang.,Fang, Xiaomin.,Yang, Yibo.,Ye, Chengcheng.,Zhang, Weilin.,...&Christidis, George E..(2023).Identification and origin of the Late Oligocene to Miocene pyroclastic rocks in the Lunpola Basin and link with deep geodynamics in the Lhasa terrane, Tibetan Plateau.JOURNAL OF ASIAN EARTH SCIENCES,247.
MLA	Mao, Ziqiang,et al."Identification and origin of the Late Oligocene to Miocene pyroclastic rocks in the Lunpola Basin and link with deep geodynamics in the Lhasa terrane, Tibetan Plateau".JOURNAL OF ASIAN EARTH SCIENCES 247(2023).