U-Pb ages and geochemistry of granitoids from Prydz Bay, East Antarctica, and their tectonic significance

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	U-Pb ages and geochemistry of granitoids from Prydz Bay, East Antarctica, and their tectonic significance
	Li, M (Li Miao); Liu, XC (Liu XiaoChun); Zhao, Y (Zhao Yue)
刊名	ACTA PETROLOGICA SINICA
	2007
卷号	23 期号:5 页码:1055-1066
关键词	East antarctica Prydz Bay granitoids post-collision
ISSN号	1000-0569
英文摘要	Voluminous granitic plutons from the Prydz Bay of East Antarctica were emplaced during the Pan-African period. Using LA-ICP-MS U-Pb zircon technique, the Dalkoy, Munro Kerr and Amanda granites were dated at 519 +/- 2Ma, 497 +/- 2Ma and 498 +/- 7Ma, respectively. All granitoids are geochemically characterized by having high total alkali contents, low Mg, Ca, Cr, Ni contents and high K2O/Na2O,FeOT/ (FeOT + MgO) and 10(4) Ga/Al ratios, in accord with A-type granites. These rocks also show LILE- and HREE-enriched patterns with variable trough at Sr, Nb-Ta, Ti and P, and have very low initial (epsilon Nd) (t) values and high initial Sr-87/Sr-86 ratios. This suggests that magmatism in Prydz Bay is probably related to the post-collisional orogeny, including lithospheric thinning, magmatic underplating and crustal extension. The occurrence of post-collisional A-type granitoids from Prydz Bay supports the suggestion that the Prydz Belt may represent a collisional orogen.
学科主题	火成岩岩石学
WOS关键词	A-TYPE GRANITES ; LARSEMANN-HILLS ; VESTFOLD HILLS ; BRATTSTRAND BLUFFS ; ZIRCON AGES ; EVOLUTION ; ROCKS ; CRUST ; AREA ; DISCRIMINATION
WOS研究方向	Geology
语种	中文
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000248135100018
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/38569]
专题	中国地质调查局
作者单位	Chinese Acad Geol Sci, Inst Geomech, Beijing 100081, Peoples R China
推荐引用方式 GB/T 7714	Li, M ,Liu, XC ,Zhao, Y . U-Pb ages and geochemistry of granitoids from Prydz Bay, East Antarctica, and their tectonic significance[J]. ACTA PETROLOGICA SINICA,2007,23(5):1055-1066.
APA	Li, M ,Liu, XC ,&Zhao, Y .(2007).U-Pb ages and geochemistry of granitoids from Prydz Bay, East Antarctica, and their tectonic significance.ACTA PETROLOGICA SINICA,23(5),1055-1066.
MLA	Li, M ,et al."U-Pb ages and geochemistry of granitoids from Prydz Bay, East Antarctica, and their tectonic significance".ACTA PETROLOGICA SINICA 23.5(2007):1055-1066.