Zircon dating of Neoproterozoic and Cambrian ophiolites in West Mongolia and implications for the timing of orogenic processes in the central part of the Central Asian Orogenic Belt

doi:10.1016/j.earscirev.2014.02.006

	Zircon dating of Neoproterozoic and Cambrian ophiolites in West Mongolia and implications for the timing of orogenic processes in the central part of the Central Asian Orogenic Belt
	Jian, Ping 1; Kroener, Alfred 2; Jahn, Bor-ming 3; Windley, Brian F.4; Shi, Yuruo 1; Zhang, Wei 1; Zhang, Fuqin ; Miao, Laicheng 5; Tomurhuu, Dondov 6; Liu, Dunyi 1
刊名	EARTH-SCIENCE REVIEWS
	2014-06-01
卷号	133 页码:62-93
关键词	Ophiolite Subduction initiation Arc-microcontinent collision Subduction-polarity reversal Central Asian Orogenic Belt Zircon dating
ISSN号	0012-8252
DOI	10.1016/j.earscirev.2014.02.006
文献子类	Article
英文摘要	We present new isotopic and trace element data to review the geochronological/geochemical/geological evolution of the central part of the Central Asian Orogenic Belt (CAOB), and find a fundamental geological problem in West Mongolia, which has traditionally been subdivided into northwestern early Paleozoic (formerly Caledonian) and southerly late Paleozoic (formerly Hercynian) belts by the Main Mongolian Lineament (MML). We resolve this problem with SHRIMP zircon dating of ophiolites and re-evaluation of much published literature. In Northwest Mongolia the Dariv-Khantaishir ophiolite marks the boundary between the Lake arc in the west and the Dzabkhan-Baydrag microcontinent in the east. Zircons from a microgabbro and four plagiogranites yielded weighted mean Pb-206/U-238 ages of 568 +/- 5 Ma, 567 +/- 4 Ma, 560 +/- 8 Ma (Dariv), 573 +/- 8 Ma and 566 +/- 7 Ma (Khantaishir) that we interpret as reflecting the time of ophiolite formation (ca. 573-560 Ma). Metamorphic zircons from an amphibolite on a thrust boundary between the Khantaishir ophiolite and the Dzabkhan-Baydrag microcontinent formed at 514 8 Ma, which we interpret as the time of overthrusting. In South Mongolia the Gobi Altai ophiolite and the Trans-Altai Gurvan Sayhan-Zoolen forearc with an ophiolite basement were investigated. Zircons of a layered gabbro (lower ophiolite crust) and a leucogabbro (mid-upper crust) of the Gobi Altai ophiolite yielded crystallization ages of 523 5 Ma and 518 6 Ma. The age data constrain the formation time of ophiolite within ca. 523-518 Ma. Zircons from four samples of the Gurvan Sayhan-Zoolen forearc, with similar hybrid adakite-boninite affinities, yielded 519 +/- 4 Ma for an anorthosite, >= 512 +/- 4 Ma for a hornblendite and 520 5 and 511 5 Ma for two diorites. The ophiolite basement has an upper age limit of 494 6 Ma, determined by dating a tonalite dike cutting the Zoolen ophiolite. Integrating available zircon ages as well as geochemical and geological data, we re-subdivide West Mongolia into: a latest Neoproterozoic-early Cambrian, arc-microcontinent collision zone north of the MML; a Cambrian Gobi Altai ophiolite-microcontinent collision zone and a Cambrian Trans-Altai forearc complex south of the MML. The central CAOB evolved in five phases: subduction initiation and arc formation (ca. 573 to > ca. 540 Ma); arc-microcontinent collision (ca. 535-524 Ma); a continuum of slab delamination, overthrusting, crustal thickening and surface uplift (ca. 519-482 Ma) in Northwest Mongolia; initiation of new subduction zones in South Mongolia (ca. 523-511 Ma); and continuing orogeny with local surface uplift. Overall, the current, documented timing of orogenic development in the central CAOB is largely consistent with a W/SW-Pacific style of evolution in terms of subduction initiation, short timescales of individual orogenies, and episodic subduction-collision during a continuing migration of subduction zones. (c) 2014 Elsevier B.V. All rights reserved.
WOS关键词	PHANEROZOIC CRUSTAL GROWTH ; COAST RANGE OPHIOLITE ; ND ISOTOPIC EVIDENCE ; U-PB GEOCHRONOLOGY ; IZU-BONIN-MARIANA ; ARC-BASIN SYSTEM ; CONTINENTAL-CRUST ; TRACE-ELEMENT ; INNER-MONGOLIA ; SW MONGOLIA
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000335634400004
资助机构	Natural Science Foundation of China(41030314 ; Natural Science Foundation of China(41030314 ; Geological Survey of China(1212010711817 ; Geological Survey of China(1212010711817 ; 40234045) ; 40234045) ; 1212010050504) ; 1212010050504) ; Natural Science Foundation of China(41030314 ; Natural Science Foundation of China(41030314 ; Geological Survey of China(1212010711817 ; Geological Survey of China(1212010711817 ; 40234045) ; 40234045) ; 1212010050504) ; 1212010050504) ; Natural Science Foundation of China(41030314 ; Natural Science Foundation of China(41030314 ; Geological Survey of China(1212010711817 ; Geological Survey of China(1212010711817 ; 40234045) ; 40234045) ; 1212010050504) ; 1212010050504) ; Natural Science Foundation of China(41030314 ; Natural Science Foundation of China(41030314 ; Geological Survey of China(1212010711817 ; Geological Survey of China(1212010711817 ; 40234045) ; 40234045) ; 1212010050504) ; 1212010050504)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/86559]
专题	中国科学院地质与地球物理研究所
通讯作者	Jian, Ping
作者单位	1.Chinese Acad Geol Sci, Inst Geol, SHRIMP Ctr, Beijing 100037, Peoples R China 2.Johannes Gutenberg Univ Mainz, Inst Geowissensch, D-55099 Mainz, Germany 3.Natl Taiwan Univ, Dept Geosci, Taipei 106, Taiwan 4.Univ Leicester, Dept Geol, Leicester LE1 7RH, Leics, England 5.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 6.Mongolian Acad Sci, Inst Geol & Mineral Resources, Ulaanbaatar 210351, Mongol Peo Rep
推荐引用方式 GB/T 7714	Jian, Ping,Kroener, Alfred,Jahn, Bor-ming,et al. Zircon dating of Neoproterozoic and Cambrian ophiolites in West Mongolia and implications for the timing of orogenic processes in the central part of the Central Asian Orogenic Belt[J]. EARTH-SCIENCE REVIEWS,2014,133:62-93.
APA	Jian, Ping.,Kroener, Alfred.,Jahn, Bor-ming.,Windley, Brian F..,Shi, Yuruo.,...&Liu, Dunyi.(2014).Zircon dating of Neoproterozoic and Cambrian ophiolites in West Mongolia and implications for the timing of orogenic processes in the central part of the Central Asian Orogenic Belt.EARTH-SCIENCE REVIEWS,133,62-93.
MLA	Jian, Ping,et al."Zircon dating of Neoproterozoic and Cambrian ophiolites in West Mongolia and implications for the timing of orogenic processes in the central part of the Central Asian Orogenic Belt".EARTH-SCIENCE REVIEWS 133(2014):62-93.