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Late Palaeozoic magmatism in the eastern Tseel Terrane of SW Mongolia evidenced by chronological and geochemical data

文献类型：期刊论文

作者Hong, Tao1,2,3; Gao, Jun3,4,5; Xu, Xing-Wang3,4,5; Wu, Chu3,4,6; Li, Hao3,4
刊名GEOLOGICAL JOURNAL
出版日期2020-10-28
页码33
关键词bimodal volcanic suite eastern Tseel Terrane zircon chronology
ISSN号0072-1050
DOI10.1002/gj.4026
英文摘要The eastern Tseel Terrane of SW Mongolia, which is an important part of the Central Asian Orogenic Belt (CAOB), contains a segment of imbricated sheets of Late Palaeozoic granites as well as a bimodal volcanic suite. Late Devonian (380-382 Ma) granites that are enriched in Th, U, and K and depleted in Nb, Ta, P, Ba, Sr, and Ti indicate arc magmatism and are low-K tholeiitic to medium-K calc-alkaline series. Zircon epsilon Hf(t) values are of +8.30 to +14.1, with crustal model ages of 0.83-0.48 Ga. The bimodal volcanic suite is composed of N-MORB basalt and 302 +/- 2 Ma rhyolite having A(2)-type granite affinities, epsilon Hf(t) values ranging from +9.9 to +11.9, and crustal model ages from 0.69 to 0.59 Ga. The rhyolite mighthave originated from partial melting of juvenile lower crust, rather than fractional crystallization of coeval basaltic magma. Late Carboniferous (299-303 Ma) granites are medium-K to high-K calc-alkaline series, cross-cutting carbonaceous siltstone, emplaced into the deformed volcanic rocks and are characterized by enrichment in K, Th, and U accompanied by depletion in Ba, Nb, Ta, Sr, P, and Ti in a primitive mantle-normalized diagram with epsilon Hf(t) values ranging from +6.05 to +10.6 and crustal model ages from 0.70 to 0.65 Ga. Thus, LA-ICP-MS zircon ages in combination with geochemical data document a phase of arc-related magmatism in the Tseel Terrane at 380-382 Ma. These rocks were subsequently deformed under low-grade metamorphic conditions and intruded by undeformed granites at c. 299-303 Ma. The coeval 302 Ma rhyolite in bimodal volcanic suite shows typical A(2)-type granitic geochemical affinities and probably documents a back-arc basin extensional environment, which was probably related to the roll-back of the Palaeo-Asian Oceanic Plate during the northward subduction under the Central Mongolia microcontinent.
WOS关键词ASIAN OROGENIC BELT ; BIMODAL VOLCANIC-ROCKS ; A-TYPE GRANITOIDS ; PHANEROZOIC CONTINENTAL GROWTH ; HF ISOTOPIC COMPOSITIONS ; U-PB AGES ; TECTONIC EVOLUTION ; NW CHINA ; GEOCHRONOLOGICAL CONSTRAINTS ; SOUTH MONGOLIA
资助项目National Key R&D Program of China[2017YFC0601201] ; National Key R&D Program of China[2018YFC0604002] ; National Natural Science Foundation of China[41802093] ; National Natural Science Foundation of China[41390442]
WOS研究方向Geology
语种英语
WOS记录号WOS:000583526100001
出版者WILEY
资助机构National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/98211]  
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Xu, Xing-Wang
作者单位1.Southern Marine Sci & Engn Guangdong Lab Zhuhai, Zhuhai, Peoples R China
2.Sun Yat Sen Univ, Sch Earth Sci & Engn, Guangdong Prov Key Lab Geodynam & Geohazards, Guangzhou, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
4.Chinese Acad Sci, Inst Earth Sci, Beijing, Peoples R China
5.Univ Chinese Acad Sci, Beijing, Peoples R China
6.China Geol Survey, Dev & Res Ctr, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Hong, Tao,Gao, Jun,Xu, Xing-Wang,et al. Late Palaeozoic magmatism in the eastern Tseel Terrane of SW Mongolia evidenced by chronological and geochemical data[J]. GEOLOGICAL JOURNAL,2020:33.
APA Hong, Tao,Gao, Jun,Xu, Xing-Wang,Wu, Chu,&Li, Hao.(2020).Late Palaeozoic magmatism in the eastern Tseel Terrane of SW Mongolia evidenced by chronological and geochemical data.GEOLOGICAL JOURNAL,33.
MLA Hong, Tao,et al."Late Palaeozoic magmatism in the eastern Tseel Terrane of SW Mongolia evidenced by chronological and geochemical data".GEOLOGICAL JOURNAL (2020):33.

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来源：地质与地球物理研究所

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