Contrasting migmatites in the southern Chinese Central Tianshan: Petrogenesis and geological implications

doi:10.18654/1000-0569/2019.10.16

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

	Contrasting migmatites in the southern Chinese Central Tianshan: Petrogenesis and geological implications
	Wang XinShui 4,5; Jiang Tuo 3; Gao Jun 5; Gao Qiang 2; Li JiLei 5; Zhang Xi 1
刊名	ACTA PETROLOGICA SINICA
	2019
卷号	35 期号:10 页码:3233-3261
关键词	Migmatite Central Tianshan Block Tianshan Orogen Central Asian Orogenic Belt
ISSN号	1000-0569
DOI	10.18654/1000-0569/2019.10.16
英文摘要	The Central Tianshan Block is a major constituent of the Paleozoic Western Tianshan Orogen in the southwestern Central Asian Orogenic Belt, and its geological evolution and tectonic affinity is essential to reconstruction of the architectural framework and subduction-accretion processes of the Western Tianshan Orogen. The ubiquitous migmatites in high-grade metamorphic terranes provide an excellent window to the tectonic evolution and affinity of the crustal basement of the Central Tianshan Block. Here we present zircon U-Pb-Hf isotopic and whole -rock geochemical data for two contrasting migmatites from the Wuwamen complex in the southern Central Tianshan Block. The first type of stromatic migmatite with an intermediate-mafic greywacke protolith underwent migmatization at ca. 1. 8Ga, resulted from metamorphic differentiation associated with the coeval amphibolite facies metamorphic event. The paleosomes of the second type of stromatic migmatite are composed of interlayered orthogneisses with protolith formation ages at ca. 2. 5Ga and an amphibolite facies metamorphic overprint at ca. 1. 8Ga. Geochemical data reveal that they were derived from partial melting of subducted oceanic crust or lithospheric mantle in an oceanic subduction setting. The meta-mafic dykes intruding the orthogneisses were formed at ca. 1. 72Ga and display geochemical affinity to Fe -Ti basalts, which are interpreted to be derived from partial melting of the asthenospheric mantle in a post-collisional setting. The leucosomes crosscut the orthogneisses and meta-mafic dykes with a sharp contact relationship, suggesting that migmatization was resulted from injection of external partial melts probably induced by anataxis during orogenic collapse. The 2. 5Ga magmatism, 1. 8Ga metamorphism and 790 Ma migmatization recorded by the Wuwamen complex are comparable to those events in the northern Tarim Craton, and thus we conclude that the Central Tianshan Block is a microcontinent with a Neoarchean-Paleoproterozoic basement and has a close affinity with the Tarim Craton.
WOS关键词	PALEOZOIC TECTONIC EVOLUTION ; ASIAN OROGENIC BELT ; SUBDUCTION-ACCRETION PROCESSES ; NORTHERN TARIM CRATON ; HF-ISOTOPE EVIDENCE ; U-PB GEOCHRONOLOGY ; LU-HF ; CRUSTAL EVOLUTION ; NW CHINA ; METAMORPHIC COMPLEX
WOS研究方向	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000491168800016
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/93877]
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	Wang XinShui
作者单位	1.China Minmetals Corp, Beijing 100010, Peoples R China 2.China Inst Geoenvironm Monitoring, Beijing 100081, Peoples R China 3.Wuhan Ctr China Geol Survey, Lab Isotope Geochem, Wuhan 430205, Hubei, Peoples R China 4.China Univ Geosci, Sch Earth Sci, State Key Lab Geol Proc & Mineral, Wuhan 430074, Hubei, Peoples R China 5.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Wang XinShui,Jiang Tuo,Gao Jun,et al. Contrasting migmatites in the southern Chinese Central Tianshan: Petrogenesis and geological implications[J]. ACTA PETROLOGICA SINICA,2019,35(10):3233-3261.
APA	Wang XinShui,Jiang Tuo,Gao Jun,Gao Qiang,Li JiLei,&Zhang Xi.(2019).Contrasting migmatites in the southern Chinese Central Tianshan: Petrogenesis and geological implications.ACTA PETROLOGICA SINICA,35(10),3233-3261.
MLA	Wang XinShui,et al."Contrasting migmatites in the southern Chinese Central Tianshan: Petrogenesis and geological implications".ACTA PETROLOGICA SINICA 35.10(2019):3233-3261.