Late Devonian-early Permian accretionary orogenesis along the North   Tianshan in the southern Central Asian Orogenic Belt

doi:10.1080/00206814.2014.913268

CORC > 北京大学 > 地球与空间科学学院

	Late Devonian-early Permian accretionary orogenesis along the North Tianshan in the southern Central Asian Orogenic Belt
	Li, Chao ; Xiao, Wenjiao ; Han, Chunming ; Zhou, Kefa ; Zhang, Ji&apos ; Zhang, Zhixin ; en
刊名	INTERNATIONAL GEOLOGY REVIEW
	2015
关键词	Tianshan Central Asian Orogenic Belt ophiolite ridge subduction roll-back NW-CHINA IMPLICATIONS PALEOZOIC TECTONIC EVOLUTION PHANEROZOIC CRUSTAL GROWTH U-PB GEOCHRONOLOGY KYRGYZ TIEN-SHAN CARBONIFEROUS VOLCANIC-ROCKS COESITE-BEARING ECLOGITE OCEAN-RIDGE BASALTS HP-UHP ROCKS WESTERN TIANSHAN
DOI	10.1080/00206814.2014.913268
英文摘要	The Palaeozoic orogenic process in the North Tianshan of the southern Central Asian Orogenic Belt is controversial. Systematic field study indicates that the ophiolitic fragments of the North Tianshan are mainly thrust slices and blocks of a late Palaeozoic accretionary complex, which was intruded by granitoids. U-Pb zircon dating of plagiogranites from the North Tianshan ophiolite yielded a mean age of 343.1 +/- 2.7 Ma. These are typical oceanic plagiogranites but with a supra-subduction zone (SSZ) signature. Ophiolitic basalts display N-MORB, E-MORB, and OIB compositions. One gabbro with an age of 301.9 +/- 2.2 Ma shows E-MORB geochemistry mixed with N-MORB and OIB. Some andesites show clear island arc characters indicated by enrichment of LILEs relative to HFSEs. Mean ages of 344.9 +/- 4.2 and 298.7 +/- 2.4 Ma were obtained for a granite porphyry and a mylonitic granite, respectively. The two granitoids display an island arc geochemical signature evidenced by enrichment of LILEs and depletion of HFSEs. Combined with an eastward migration of Late Devonian to Carboniferous arc magmatism and related Cu-Au-Mo deposits, we propose that trench retreat and slab roll-back took place during subduction of the Junggar Ocean spreading ridge beneath the North Tianshan arc, and that the accretion may have lasted into early Permian time, an important late stage of the long-lived accretionary orogenesis in the southern Central Asian Orogenic Belt.; National Natural Science Foundation of China [41230207, 41390441, 41190075, 41202150]; Chinese Academy of Sciences; Major State Mafic Research Development Programme of China [2007CB411307]; SCI(E); ARTICLE; wj-xiao@mail.iggcas.ac.cn; 5-8,SI; 1023-1050; 57
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/419344]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Li, Chao,Xiao, Wenjiao,Han, Chunming,et al. Late Devonian-early Permian accretionary orogenesis along the North Tianshan in the southern Central Asian Orogenic Belt[J]. INTERNATIONAL GEOLOGY REVIEW,2015.
APA	Li, Chao.,Xiao, Wenjiao.,Han, Chunming.,Zhou, Kefa.,Zhang, Ji&apos.,...&en.(2015).Late Devonian-early Permian accretionary orogenesis along the North Tianshan in the southern Central Asian Orogenic Belt.INTERNATIONAL GEOLOGY REVIEW.
MLA	Li, Chao,et al."Late Devonian-early Permian accretionary orogenesis along the North Tianshan in the southern Central Asian Orogenic Belt".INTERNATIONAL GEOLOGY REVIEW (2015).