Early Permian post-collisional high-K granitoids from Liuyuan area in;southern Beishan orogen, NW China: Petrogenesis and tectonic;implications

doi:10.1016/j.lithos.2013.08.002

	Early Permian post-collisional high-K granitoids from Liuyuan area in;southern Beishan orogen, NW China: Petrogenesis and tectonic;implications
	Li, Shan 3; Wilde, Simon A.; Wang, Tao
刊名	LITHOS
	2013
卷号	179 页码:99-119
关键词	Early Permian High-K granitoids Petrogenesis Beishan orogen Post-collisional magmatism Southern CAOB
ISSN号	0024-4937;EI 1872-6143
DOI	10.1016/j.lithos.2013.08.002
英文摘要	Early Permian magmatism is one of the most important tectonothermal events in the Central Asian Orogenic Belt (CAOB). Early Permian granitic magmatism has been recognized from southern Beishan, NW China and they were emplaced between 275 Ma and 279 Ma according to LA-ICPMS zircon U-Pb dating. They are mainly metaluminous I-type and belong to the high-K calc-alkaline and shoshonitic series. The granitoids have calc-alkalic and alkali-calcic features. Their Sr-i values range from 0.7028 to 0.7047, epsilon(Nd)(t) values from -2.5 to +1.2 with Nd model ages (T-DM) of 1.06-1.25 Ga, suggesting a mixed magma source of juvenile material with old continental crust. Furthermore, some granitoids have weak heterogeneous zircon epsilon(Hf)(t) values (-1.7 to +9.6) and Hf model ages (T-DM2 = 0.84-1.57 Ga) that are also indicative of juvenile components with a small involvement of old continental crust. Based on geochemical and isotopic features, these high-K granitoids were derived from melting of heterogeneous crustal sources or through mixing of old continental crust with juvenile components and minor AFC (assimilation and fractional crystallization). The juvenile components probably originated from underplated basaltic magmas in response to asthenospheric upwelling. These Early Permian high-K calc-alkaline granitoids in the southern Beishan orogen were probably emplaced in a post-collisional extensional setting and suggest vertical continental crustal growth in the southern CAOB, which is the same or similar to most granitoids in CAOB. This study provides new evidence for determining the post-accretionary evolution of the southern CAOB. (C) 2013 Elsevier B.V. All rights reserved.
学科主题	火成岩岩石学
WOS关键词	ZIRCON U-PB ; A-TYPE GRANITES ; PHANEROZOIC CONTINENTAL GROWTH ; I-TYPE ; GRANITES ; CALC-ALKALINE ; CENTRAL-ASIA ; NORTHWEST CHINA ; EASTERN ; TIANSHAN ; LOW-TEMPERATURE ; HIGH-POTASSIUM
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000328592900008
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40155]
专题	中国地质科学院地质研究所
作者单位	1.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China. 2.Li, Shan; Wilde, Simon A.] Curtin Univ, Dept Appl Geol, Perth, WA 6845, Australia. 3.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Li, Shan,Wilde, Simon A.,Wang, Tao. Early Permian post-collisional high-K granitoids from Liuyuan area in;southern Beishan orogen, NW China: Petrogenesis and tectonic;implications[J]. LITHOS,2013,179:99-119.
APA	Li, Shan,Wilde, Simon A.,&Wang, Tao.(2013).Early Permian post-collisional high-K granitoids from Liuyuan area in;southern Beishan orogen, NW China: Petrogenesis and tectonic;implications.LITHOS,179,99-119.
MLA	Li, Shan,et al."Early Permian post-collisional high-K granitoids from Liuyuan area in;southern Beishan orogen, NW China: Petrogenesis and tectonic;implications".LITHOS 179(2013):99-119.