Mantle contribution and tectonic transition in the Aqishan-Yamansu Belt, Eastern Tianshan, NW China: Insights from geochronology and geochemistry of Early Carboniferous to Early Permian felsic intrusions

doi:10.1016/j.lithos.2018.02.010

	Mantle contribution and tectonic transition in the Aqishan-Yamansu Belt, Eastern Tianshan, NW China: Insights from geochronology and geochemistry of Early Carboniferous to Early Permian felsic intrusions
	Du, Long 1,2; Long, Xiaoping 3; Yuan, Chao 1; Zhang, Yunying 1; Huang, Zongying 1; Wang, Xinyu 1; Yang, Yueheng 4
刊名	LITHOS
	2018-04-01
卷号	304 页码:230-244
关键词	Eastern Tianshan Aqishan-Yamansu belt Felsic plutons Crustal evolution Tectonic transition
ISSN号	0024-4937
DOI	10.1016/j.lithos.2018.02.010
文献子类	Article
英文摘要	Late Paleozoic is a key period for the accretion and collision of the southern Central Asian Orogenic Belt (CAOB). Here, we present new zircon U-Pb ages, whole-rock geochemistry and Sr-Nd isotopic compositions for four Late Paleozoic felsic plutons in Eastern Tianshan (or Tienshan in some literatures) in order to constrain the tectonic evolution of the southern CAOB. The granodioritic pluton and its dioritic enclaves were synchronously formed in the Early Carboniferous (336 +/- 3 Ma and 335 +/- 2 Ma, respectively). These rocks are depleted in Nb, Ta and Ti, and enriched in Rb, Ba, Th and U related to the primitive mantle, which show typical features of arc rocks. They both have similar Sr-Nd isotopic ratios to those granitic rocks from the eastern Central Tianshan Block and have the latest Mesoproterozoic two stage Nd model ages (T-DM(2)) (1111-1195 Ma for the granodioritic pluton and 1104-1108 Ma for the enclaves, respectively), indicating that their source magmas may have been derived from the Mesoproterozoic crust. The albitophyric pluton was also emplaced in the Early Carboniferous (333 +/- 3 Ma). Rocks of this pluton have similar epsilon(Nd)(t) values ( -0.69 to -0.37) and T-DM(2) ages (1135-1161 Ma) to those of the granodioritic rocks, suggest similar crustal source for both types of rocks. In contrast, the K-feldspar granitic and monzonitic plutons were emplaced in the Early Permian (292 +/- 3 Ma and 281 +/- 2 Ma, respectively). Samples of the K-feldspar granitic pluton have high K2O + Na2O, FeO/MgO, Ga/Al, HFSE (e.g., Zr and Hf) and low CaO, Sr and Ba, exhibiting characteristics of A(2) -type granites, which probably emplaced in a post-collisional extension environment. They have higher epsilon(ND)(t) values (+2.77 to +3.27) and more juvenile TPro ages (799-841 Ma) than the Early Carboniferous plutons, suggesting that they were derived from relatively younger crustal sources. The monzonitic granites are metaluminous to weakly peraluminous with A/CNK ranging from 0.93 to 1.05, and have very low P2O5, indicating characteristics of I-type granites. They also have positive epsilon(Nd)(t) values (+2.22 to +234) and juvenile T-DM(2) ages (868-878 Ma), suggesting this pluton was also produced by partial melting of relatively young crustal source. Based on an isotopic mixing simulation, significant mantle contributions were added to the magma source of both the Early Carboniferous and the Early Permian felsic rocks. The mantle contribution changes from similar to 60% in the Early Carboniferous to similar to 75% in the Early Permian. The remarkably increasing of mantle materials in the magma source of the felsic rocks in the Aqishan-Yamansu belt was most likely induced by the tectonic transition from an Early Carboniferous continental arc to an Early Permian post-collisional extension environment. (C) 2018 Elsevier B.V. All rights reserved.
WOS关键词	A-TYPE GRANITES ; ASIAN OROGENIC BELT ; LACHLAN FOLD BELT ; CONTINENTAL GROWTH ; CRUSTAL GROWTH ; ISOTOPIC EVIDENCE ; VOLCANIC-ROCKS ; SOUTH CHINA ; I-TYPE ; ACCRETIONARY OROGENESIS
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000430029800014
资助机构	National Basic Research Program of China(2014CB440801) ; National Basic Research Program of China(2014CB440801) ; National Natural Science Foundation of China(41522202 ; National Natural Science Foundation of China(41522202 ; 41603028) ; 41603028) ; National Basic Research Program of China(2014CB440801) ; National Basic Research Program of China(2014CB440801) ; National Natural Science Foundation of China(41522202 ; National Natural Science Foundation of China(41522202 ; 41603028) ; 41603028) ; National Basic Research Program of China(2014CB440801) ; National Basic Research Program of China(2014CB440801) ; National Natural Science Foundation of China(41522202 ; National Natural Science Foundation of China(41522202 ; 41603028) ; 41603028) ; National Basic Research Program of China(2014CB440801) ; National Basic Research Program of China(2014CB440801) ; National Natural Science Foundation of China(41522202 ; National Natural Science Foundation of China(41522202 ; 41603028) ; 41603028)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/83144]
专题	中国科学院地质与地球物理研究所
通讯作者	Long, Xiaoping
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.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Shaanxi, Peoples R China 4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Du, Long,Long, Xiaoping,Yuan, Chao,et al. Mantle contribution and tectonic transition in the Aqishan-Yamansu Belt, Eastern Tianshan, NW China: Insights from geochronology and geochemistry of Early Carboniferous to Early Permian felsic intrusions[J]. LITHOS,2018,304:230-244.
APA	Du, Long.,Long, Xiaoping.,Yuan, Chao.,Zhang, Yunying.,Huang, Zongying.,...&Yang, Yueheng.(2018).Mantle contribution and tectonic transition in the Aqishan-Yamansu Belt, Eastern Tianshan, NW China: Insights from geochronology and geochemistry of Early Carboniferous to Early Permian felsic intrusions.LITHOS,304,230-244.
MLA	Du, Long,et al."Mantle contribution and tectonic transition in the Aqishan-Yamansu Belt, Eastern Tianshan, NW China: Insights from geochronology and geochemistry of Early Carboniferous to Early Permian felsic intrusions".LITHOS 304(2018):230-244.