Contemporaneous of Early Palaeozoic granite and high temperature metamorphism, North Qaidam Mountains, western China

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	Contemporaneous of Early Palaeozoic granite and high temperature metamorphism, North Qaidam Mountains, western China
	Meng, FC (Meng FanCong); Zhang, JX (Zhang JianXin)
刊名	ACTA PETROLOGICA SINICA
	2008
卷号	24 期号:7 页码:1585-1594
关键词	Granite SHRIMP Zircon Geochemistry Luliangshan North Qaidam Mountains
ISSN号	1000-0569
英文摘要	SHRIMP U-Pb dating of zircons from the Luliangshan granite of the North Qaidam Mountains yields age of 430 +/- 8Ma (average of 12 data points), with Th/U ratios higher than 0.1, reflecting the magmatic crystallization age. Some grains with zoning structure (core-rim) of zircon are metamorphic inherit type zircon from granite, similar to zircons from host gneisses, whose ages of core from 475 similar to 460Ma and Th/U ratios range from 0.01 similar to 0.02, indicating genetic relation between granite and gneisses. Granite have various content of SiO2 (65.63% similar to 74.78%), Al2O3 (13.99% similar to 15.52%), Na2O(3.24% similar to 5.19%), K2O(1.98% similar to 4.81%), belonging to calc-alkaline series and peraluminous rocks. We considered granite mainly derived from sedimentary rock source. Metasediment predominates in host gneisses and possibly is main source of granite. But with high initial Sr-87/Sr-86 ratios (0.71075) and epsilon(Nd) (t) values 5.5 to -4.6) in granite, difference is evident in Sr-Nd isotopic compositions between granite and gneisses, suggesting the former originated at higher temperature, fluid-absent conditions or by introduce of mantle / juvenile crustal material during the generation of the granite. Synchronism of granite formation and metamorphism of host gneisses reflects result of same regional tectono-thermal event of post-HP/UHP metamorphism and is related to early crust subduction and subsequent themal relaxation and exhumation.
学科主题	火成岩岩石学
WOS关键词	CONTINENTAL COLLISION ; GARNET PERIDOTITE ; UHP METAMORPHISM ; TIBETAN PLATEAU ; DABIE OROGEN ; ND ; SUBDUCTION ; COMPLEX ; ORIGIN ; GEOCHRONOLOGY
WOS研究方向	Geology
语种	中文
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000260313300014
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/38758]
专题	中国地质调查局
作者单位	Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China
推荐引用方式 GB/T 7714	Meng, FC ,Zhang, JX . Contemporaneous of Early Palaeozoic granite and high temperature metamorphism, North Qaidam Mountains, western China[J]. ACTA PETROLOGICA SINICA,2008,24(7):1585-1594.
APA	Meng, FC ,&Zhang, JX .(2008).Contemporaneous of Early Palaeozoic granite and high temperature metamorphism, North Qaidam Mountains, western China.ACTA PETROLOGICA SINICA,24(7),1585-1594.
MLA	Meng, FC ,et al."Contemporaneous of Early Palaeozoic granite and high temperature metamorphism, North Qaidam Mountains, western China".ACTA PETROLOGICA SINICA 24.7(2008):1585-1594.