The Grenvillian orogeny in the Altun-Qilian-North Qaidam mountain belts;of northern Tibet Plateau: Constraints from geochemical and zircon U-Pb;age and Hf isotopic study of magmatic rocks

doi:10.1016/j.jseaes.2013.04.042

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	The Grenvillian orogeny in the Altun-Qilian-North Qaidam mountain belts;of northern Tibet Plateau: Constraints from geochemical and zircon U-Pb;age and Hf isotopic study of magmatic rocks
	Yu, Shengyao 5; Zhang, Jianxin ; del Real, Pablo Garcia 1; Zhao, Xilin 2; Hou, Kejun 3; Gong, Jianghua ; Li, Yunshuai
刊名	JOURNAL OF ASIAN EARTH SCIENCES
	2013
卷号	73 页码:372-395
关键词	Altun-Qilian-North Qaidam Zircon geochronology Zircon Hf isotopes Geochemistry Grenvillian orogeny
ISSN号	1367-9120;EI 1878-5786
DOI	10.1016/j.jseaes.2013.04.042
英文摘要	Numerous Neoproterozoic magmatic and metamorphic events in the Altun-Qilian-North Qaidam (AQNQ) region record Grenvillian orogenesis and amalgamation of the supercontinent Rodinia. However, the tectonothermal regimes responsible for these Neoproterozoic events and the assumed position of the AQNQ in Rodinia remain controversial. Zircon U-Pb age data show that the orthogneiss and paragneiss/schist of the AQNQ experienced concurrent magmatism and metamorphism at 895-925 Ma. Zircon Lu-Hf isotopic data indicate that the gneisses in the AQNQ have epsilon(Hf) (0.9 Ga) values and t(DM2) (Hf) model ages. ranging from -5.6 to +3.9 and 1.4 to 1.9 Ga. These data suggest that the early Neoproterozoic magma in the AQNQ was predominately derived from a late Paleoproterozoic-early Mesoproterozoic crustal source between 1.4 and 1.9 Ga, marking an important episode of crustal growth in the AQNQ. The Neoproterozoic magmatism is geochemically characterized by (1) high SiO2, K2O, and low P2O5; (2) A/CNK ratios >1.0, ranging from 1.03 to 1.09; (3) enrichment in Rb, Th and U, and depletion in Ba, Nb, Ta, Sr, Ti, and Eu. Based on the geochemical resemblance to high-K calc-alkaline l-type granite and zircon Lu-Hf isotope signatures, the Neoproterozoic magmatism in the AQNQ was probably derived from ancient mafic-intermediate igneous rocks in an active continental margin. The Neoproterozoic tectonomagmatic-metamorphic history of the AQNQ directly associated with the South China block (SCB) and the Tarim block (TB), indicates that the AQNQ and the TB coexisted as a single block in the early Neoproterozoic, which was temporarily connected to the SCB to the north or west in Rodinia during the late stages of the Grenvillian orogeny (950-900 Ma). (C) 2013 Elsevier Ltd. All rights reserved.
学科主题	构造地质学
WOS关键词	UHP METAMORPHIC BELT ; NEOPROTEROZOIC TECTONIC EVOLUTION ; I-TYPE ; GRANITES ; NW CHINA ; SOUTH CHINA ; WESTERN CHINA ; EAST ANTARCTICA ; YANGTZE ; BLOCK ; ALTYN TAGH ; CONTINENTAL COLLISION
WOS研究方向	Geology
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000322929500032
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40122]
专题	中国地质调查局南京地质调查中心
作者单位	1.Chinese Acad Geol Sci, Inst Geol, State Key Lab Continental Tecton & Dynam, Beijing 100037, Peoples R China. 2.Stanford Univ, Dept Geol & Environm Sci, Stanford, CA 94305 USA. 3.Nanjing Inst Geol & Mineral Resources, Nanjing 210016, Jiangsu, Peoples R China. 4.Chinese Acad Geol Sci, Inst Mineral Resources, Beijing 100037, Peoples R China. 5.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Yu, Shengyao,Zhang, Jianxin,del Real, Pablo Garcia,et al. The Grenvillian orogeny in the Altun-Qilian-North Qaidam mountain belts;of northern Tibet Plateau: Constraints from geochemical and zircon U-Pb;age and Hf isotopic study of magmatic rocks[J]. JOURNAL OF ASIAN EARTH SCIENCES,2013,73:372-395.
APA	Yu, Shengyao.,Zhang, Jianxin.,del Real, Pablo Garcia.,Zhao, Xilin.,Hou, Kejun.,...&Li, Yunshuai.(2013).The Grenvillian orogeny in the Altun-Qilian-North Qaidam mountain belts;of northern Tibet Plateau: Constraints from geochemical and zircon U-Pb;age and Hf isotopic study of magmatic rocks.JOURNAL OF ASIAN EARTH SCIENCES,73,372-395.
MLA	Yu, Shengyao,et al."The Grenvillian orogeny in the Altun-Qilian-North Qaidam mountain belts;of northern Tibet Plateau: Constraints from geochemical and zircon U-Pb;age and Hf isotopic study of magmatic rocks".JOURNAL OF ASIAN EARTH SCIENCES 73(2013):372-395.