Late Carboniferous bimodal volcanic rocks and coeval A-type granite in the Suman Khad area, Southwest Mongolia: Implications for the tectonic evolution

doi:10.1016/j.jseaes.2017.03.025

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 > 中国科学院矿产资源研究重点实验室

	Late Carboniferous bimodal volcanic rocks and coeval A-type granite in the Suman Khad area, Southwest Mongolia: Implications for the tectonic evolution
	Zhu, Mingshuai 1; Zhang, Fochin 1; Fan, Jingjing 1,3; Miao, Laicheng 1; Baatar, Munkhtsengel 2; Anaad, Chimedtseren 2; Yang, Shunhu 1,3; Lia, Xingbo 1,3; Ganbat, Ariuntsetseg 2
刊名	JOURNAL OF ASIAN EARTH SCIENCES
	2017-08-15
卷号	144 页码:54-68
关键词	Bimodal SHRIMP A-type granite Late Carboniferous
ISSN号	1367-9120
DOI	10.1016/j.jseaes.2017.03.025
文献子类	Article
英文摘要	The volcanic rocks in the Suman Khad area in Southwest Mongolia form a bimodal suite consisting mainly of peralkaline rhyolites with subordinate basalts. The rhyolite sample collected from the bimodal suite yielded a SHRIMP zircon U-Pb age of 314 +/- 5 Ma (MSWD = 1.41, n = 12), which was interpreted to represent formation time of the bimodal volcanic suite. The basalts were characterized by enrichment in LILE and LREE, and depletion in HFSE, indicating their formation was related to subduction processes. These features, together with their positive epsilon(Nd(t)) values (6.3-6.7), suggest that the basalts were likely derived from a depleted mantle source metasomatized by subduction-related fluids. In various tectonic discrimination diagrams, the basalts exhibited a transition from true arc basalts to intraplate basalts and thus were suggested to from in a back-arc tectonic setting. The rhyolites show a close affinity to A-type granites with enrichment in LILE and LREE, depletion in Nb, Ta and Ti and positive epsilon(Nd(t)) values (6.0-6.4). Considering the observed distinct compositional gap between the endmembers of the bimodal suite, the rhyolites are proposed to originate from partial melting of juvenile basaltic crustal rocks rather than fractional crystallization of basaltic melt. The granite associated with the bimodal volcanic rocks yielded a SHRIMP zircon U-Pb ages of 312 +/- 5 Ma (MSWD = 0.75, n = 13), indicating that the granite is contemporaneous with the bimodal volcanic suite. The granite samples showed typical A-type granitic geochemical affinities and are considered to have been formed by partial melting of crustal rocks in a within-plate tectonic setting. Based on a combination of the available data, we suggest that the Late Carboniferous bimodal volcanic suite together with the coeval A-type granites in the Suman Khad region probably document a back-arc basin extensional environment, which probably related to the roll-back of the Paleo-Asian oceanic plate during the northward subduction under the Central Mongolia microcontinent.
WOS关键词	ASIAN OROGENIC BELT ; PLUME-LITHOSPHERE INTERACTION ; SOUTHERN MONGOLIA ; CRUSTAL GROWTH ; SW MONGOLIA ; GEOCHEMICAL CONSTRAINTS ; PALEOZOIC ACCRETIONARY ; CONTINENTAL GROWTH ; STABLE-ISOTOPE ; CALC-ALKALINE
WOS研究方向	Geology
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000404312000005
资助机构	Ministry of Science and Technology of China(2012FY120100) ; Ministry of Science and Technology of China(2012FY120100) ; National Natural Science Fund Committee(41502217) ; National Natural Science Fund Committee(41502217) ; China Postdoctoral Science Foundation(2016T90131) ; China Postdoctoral Science Foundation(2016T90131) ; Ministry of Science and Technology of China(2012FY120100) ; Ministry of Science and Technology of China(2012FY120100) ; National Natural Science Fund Committee(41502217) ; National Natural Science Fund Committee(41502217) ; China Postdoctoral Science Foundation(2016T90131) ; China Postdoctoral Science Foundation(2016T90131) ; Ministry of Science and Technology of China(2012FY120100) ; Ministry of Science and Technology of China(2012FY120100) ; National Natural Science Fund Committee(41502217) ; National Natural Science Fund Committee(41502217) ; China Postdoctoral Science Foundation(2016T90131) ; China Postdoctoral Science Foundation(2016T90131) ; Ministry of Science and Technology of China(2012FY120100) ; Ministry of Science and Technology of China(2012FY120100) ; National Natural Science Fund Committee(41502217) ; National Natural Science Fund Committee(41502217) ; China Postdoctoral Science Foundation(2016T90131) ; China Postdoctoral Science Foundation(2016T90131)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/50669]
专题	地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者	Zhu, Mingshuai
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Mongolian Univ Sci & Technol, Ulaanbaatar 120646, Mongol Peo Rep 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Zhu, Mingshuai,Zhang, Fochin,Fan, Jingjing,et al. Late Carboniferous bimodal volcanic rocks and coeval A-type granite in the Suman Khad area, Southwest Mongolia: Implications for the tectonic evolution[J]. JOURNAL OF ASIAN EARTH SCIENCES,2017,144:54-68.
APA	Zhu, Mingshuai.,Zhang, Fochin.,Fan, Jingjing.,Miao, Laicheng.,Baatar, Munkhtsengel.,...&Ganbat, Ariuntsetseg.(2017).Late Carboniferous bimodal volcanic rocks and coeval A-type granite in the Suman Khad area, Southwest Mongolia: Implications for the tectonic evolution.JOURNAL OF ASIAN EARTH SCIENCES,144,54-68.
MLA	Zhu, Mingshuai,et al."Late Carboniferous bimodal volcanic rocks and coeval A-type granite in the Suman Khad area, Southwest Mongolia: Implications for the tectonic evolution".JOURNAL OF ASIAN EARTH SCIENCES 144(2017):54-68.