North Qinling Paleozoic granite associations and their variation in space and time Implications for orogenic processes in the orogens of central China

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	North Qinling Paleozoic granite associations and their variation in space and time Implications for orogenic processes in the orogens of central China
	Wang, T (Wang Tao); Wang, XX (Wang XiaoXia); Tian, W (Tian Wei); Zhang, CL (Zhang ChengLi); Li, WP (Li WuPing); Li, S (Li Shan)
刊名	SCIENCE IN CHINA SERIES D-EARTH SCIENCES
	2009
卷号	52 期号:9 页码:1359-1384
关键词	zircon geochronology granite association Nd Hf isotopes Qinling orogen
ISSN号	1006-9313
英文摘要	Integrated zircon U-Pb dating and whole rock geochemical analyses have been carried out for two typical S- and I-type granitoids in the north Qinling. Zircon dating by SIMS of the Piaochi S-type granitoids yields an emplacement age of 495 +/- 6 Ma. The granitoids show whole-rock E > (Nd)(t)=-8.2--.8.8, zircon E > (Hf) (t)=-6--39. The Huichizi I-type granitoids have emplacement ages of 421 +/- 27 Ma and 434 +/- 7 Ma established by LA-ICP-MS and SIMS methods, respectively. Their whole-rock E > (Nd)(t)=-0.9-0.9 and zircon E > (Hf)(t)=-11-8.4. Combined with statistical analyses of 28 zircon ages of granitoid plutons collected from the literature, Paleozoic magmatism in the north Qinling can be divided into three stages. The first-stage magmatism (similar to 505-470 Ma) mainly occurred in the east part of the north Qinling and has features of an I-type arc, associated with which are S-type granitoids such as Piaochi pluton. The early granitoids (similar to 505-490 Ma) have close spatio-temporal relations to ultra-high-pressure (UHP) rocks, and thus are interpreted as an oceanic subduction system along a continental margin. The second-stage magmatism (similar to 450-422 Ma) occured through the whole north Qinling, and is characterized by I-type granitoids represented by the Huichizi pluton. The magma is interpreted as partial melting of lower crust mixed by mantle-derived magma in a collisional setting with the uplift of terranes. The third-stage magmatism (similar to 415-400 Ma) is dominated by I-type granitoids and only took place in the middle part of the north Qinling, and is regarded as a late-stage collision. The spatial and temporal variations of the Qinling Paleozoic magmatism reveal protracted subduction/collision. The subduction was initiated from the east part of the north Qinling, earlier than that in the Qilian-northern Qaidam, Kunlun, and northern Dabie regions. This demonstrates variations in time of subduction, accretion and collision of separate blocks or terranes in the orogenic systems in central China.
学科主题	火成岩岩石学
WOS关键词	ZIRCON U-PB ; TECTONIC EVOLUTION ; ICP-MS ; SM-ND ; TRACE-ELEMENT ; EASTERN ASIA ; BELT ; AGES ; MOUNTAINS ; ROCKS
WOS研究方向	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000269974200009
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39021]
专题	中国地质调查局
作者单位	Guangzhou Univ, Sch Civil Engn, Guangzhou 510006, Guangdong, Peoples R China
推荐引用方式 GB/T 7714	Wang, T ,Wang, XX ,Tian, W ,et al. North Qinling Paleozoic granite associations and their variation in space and time Implications for orogenic processes in the orogens of central China[J]. SCIENCE IN CHINA SERIES D-EARTH SCIENCES,2009,52(9):1359-1384.
APA	Wang, T ,Wang, XX ,Tian, W ,Zhang, CL ,Li, WP ,&Li, S .(2009).North Qinling Paleozoic granite associations and their variation in space and time Implications for orogenic processes in the orogens of central China.SCIENCE IN CHINA SERIES D-EARTH SCIENCES,52(9),1359-1384.
MLA	Wang, T ,et al."North Qinling Paleozoic granite associations and their variation in space and time Implications for orogenic processes in the orogens of central China".SCIENCE IN CHINA SERIES D-EARTH SCIENCES 52.9(2009):1359-1384.