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The high-grade Tseel Terrane in SW Mongolia: An Early Paleozoic arc system or a Precambrian sliver?

文献类型：期刊论文

作者Jiang, Yingde1; Sun, Min1; Kroener, Alfred2,3; Tumurkhuu, Dondov4; Long, Xiaoping5; Zhao, Guochun1; Yuan, Chao5; Xiao, Wenjiao6
刊名LITHOS
出版日期2012-06-01
卷号142页码:95-115
关键词Tseel Terrane High-grade gneiss Zircon dating Early Paleozoic Arc system
ISSN号0024-4937
DOI10.1016/j.lithos.2012.02.016
文献子类Article
英文摘要The high-grade metamorphic Tseel Terrane in southwestern Mongolia is dominated by a strongly deformed sequence of migmatitic gneisses which has previously been interpreted as an early Precambrian continental sliver. However, the protolith age and timing of high-grade metamorphism remain poorly constrained. To resolve this problem, high-grade gneisses selected from the western Tseel Terrane were dated in the present study. Zircons with oscillatory zoning from three paragneisses predominantly yielded early Paleozoic ages between 450 and 550 Ma, with prominent peaks at 471 and 506 Ma. U-Pb dating of zircons from a granitic gneiss revealed that the protolith was emplaced at 420 Ma. Zircons from a leucocratic granite vein gave a concordant age of 385 +/- 3 Ma, close to ages of metamorphic zircons in the gneissic rocks, which is interpreted to record a high-temperature thermal event in the region. These results indicate that the Tseel Terrane principally consists of early Paleozoic rocks which underwent a high-grade metamorphic event in the Middle Devonian. In addition, SHRIMP dating of dominant magmatic zircons from an associated schist yielded a concordant U-Pb age of 495 +/- 5 Ma, similar to those of the major zircon group in the high-grade paragneiss. A felsic tuffaceous sample yielded a U-Pb zircon age of 511 +/- 4 Ma, documenting early Paleozoic volcanism which probably contributed to the deposition of the sediments in the region. Geochemically, high-grade paragneisses and low-grade schists show close similarities, and their common features suggest that their protoliths may represent significant erosion products of Cambrian arc magmatic rocks with minor old crustal components that were deposited in an active margin setting. The granitic gneiss with subduction-related chemical characteristics further favors an arc setting for the Tseel Terrane. Accordingly, our data combined with previous work suggest that the Tseel Terrane represents the constituent part of an early Paleozoic arc system situated on the southern margin of North Mongolian Domain. This arc system extended from western Mongolia to the Chinese Altai because various geological features of these two regions have close similarities. (C) 2012 Elsevier B.V. All rights reserved.
WOS关键词ASIAN OROGENIC BELT ; BAYANKHONGOR OPHIOLITE ZONE ; U-PB GEOCHRONOLOGY ; CHINESE ALTAI ; GEOCHEMICAL EVIDENCE ; TECTONIC EVOLUTION ; DETRITAL ZIRCONS ; CRUSTAL GROWTH ; GEODYNAMIC IMPLICATIONS ; CRYSTALLINE COMPLEXES
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000304725500007
出版者ELSEVIER SCIENCE BV
资助机构Chinese National 973 Program(2007CB411308) ; Chinese National 973 Program(2007CB411308) ; Hong Kong Research Grants Council(HKU704307P ; Hong Kong Research Grants Council(HKU704307P ; NSFC(40725009) ; NSFC(40725009) ; Hong Kong University ; Hong Kong University ; Hong Kong-Germany Joint Research Scheme ; Hong Kong-Germany Joint Research Scheme ; HKU705311P) ; HKU705311P) ; Chinese National 973 Program(2007CB411308) ; Chinese National 973 Program(2007CB411308) ; Hong Kong Research Grants Council(HKU704307P ; Hong Kong Research Grants Council(HKU704307P ; NSFC(40725009) ; NSFC(40725009) ; Hong Kong University ; Hong Kong University ; Hong Kong-Germany Joint Research Scheme ; Hong Kong-Germany Joint Research Scheme ; HKU705311P) ; HKU705311P) ; Chinese National 973 Program(2007CB411308) ; Chinese National 973 Program(2007CB411308) ; Hong Kong Research Grants Council(HKU704307P ; Hong Kong Research Grants Council(HKU704307P ; NSFC(40725009) ; NSFC(40725009) ; Hong Kong University ; Hong Kong University ; Hong Kong-Germany Joint Research Scheme ; Hong Kong-Germany Joint Research Scheme ; HKU705311P) ; HKU705311P) ; Chinese National 973 Program(2007CB411308) ; Chinese National 973 Program(2007CB411308) ; Hong Kong Research Grants Council(HKU704307P ; Hong Kong Research Grants Council(HKU704307P ; NSFC(40725009) ; NSFC(40725009) ; Hong Kong University ; Hong Kong University ; Hong Kong-Germany Joint Research Scheme ; Hong Kong-Germany Joint Research Scheme ; HKU705311P) ; HKU705311P)
源URL[http://ir.iggcas.ac.cn/handle/132A11/84190]  
专题中国科学院地质与地球物理研究所
通讯作者Sun, Min
作者单位1.Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China
2.Johannes Gutenberg Univ Mainz, Inst Geowissensch, D-55099 Mainz, Germany
3.Chinese Acad Geol Sci, Beijing SHRIMP Ctr, Beijing, Peoples R China
4.Mongolian Acad Sci, Inst Geol & Mineral Resources, Ulaanbaatar 100029, Mongol Peo Rep
5.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China
6.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		 Jiang, Yingde,Sun, Min,Kroener, Alfred,et al. The high-grade Tseel Terrane in SW Mongolia: An Early Paleozoic arc system or a Precambrian sliver?[J]. LITHOS,2012,142:95-115.
APA Jiang, Yingde.,Sun, Min.,Kroener, Alfred.,Tumurkhuu, Dondov.,Long, Xiaoping.,...&Xiao, Wenjiao.(2012).The high-grade Tseel Terrane in SW Mongolia: An Early Paleozoic arc system or a Precambrian sliver?.LITHOS,142,95-115.
MLA Jiang, Yingde,et al."The high-grade Tseel Terrane in SW Mongolia: An Early Paleozoic arc system or a Precambrian sliver?".LITHOS 142(2012):95-115.

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来源：地质与地球物理研究所

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