Geochronology and isotopic geochemistry of the A-type granites from the Huanggang Sn-Fe deposit, southern Great Hinggan Range, NE China  Implication for their origin and tectonic setting

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	Geochronology and isotopic geochemistry of the A-type granites from the Huanggang Sn-Fe deposit, southern Great Hinggan Range, NE China Implication for their origin and tectonic setting
	Zhou, ZH (Zhou, Zhen-Hua); Mao, JW (Mao, Jing-Wen); Lyckberg, P (Lyckberg, Peter)
刊名	JOURNAL OF ASIAN EARTH SCIENCES
	2012
卷号	49 期号:特刊 SI 页码:272-286
关键词	A-type granites Zircon U-Pb dating Sr-Nd-Pb-Hf isotope systematics Tectonic-magmatic evolution Great Hinggan Range
ISSN号	1367-9120
英文摘要	The Huanggang Sn-Fe deposit, Inner Mongolia, is located in southern Great Hinggan Range metallogenic belt. LA-ICP-MS zircon U-Pb dating show that the K-feldspar granite and granite-porphyry in the Huanggang mine were formed at 136.7 +/- 1.1 Ma and 136.8 +/- 0.57 Ma, respectively. Sr-Nd-Pb isotope of the rocks and In situ zircon Hf isotopic systematics show that (Sr-87/Sr-86)(i) values range from 0.70211 to 0.70729, close to the (Sr-87/Sr-86)(i) of oceanic basalts and lower than those of continental crust. The epsilon(Nd)(t) values and Nd model ages (T-DM) vary from -0.8 to 0.9 and 855 to 993 Ma, respectively. The Pb isotopic compositions are also variable with Pb-206/Pb-204, Pb-207/Pb-204 and Pb-208/Pb-204 values of 18.974-26.107, 15.554-15.914 and 38.894-39.890, respectively, suggesting that the lead is derived from a mixed source. The Hf-176/Hf-177 values range from 0.282744 to 0.282922, with corresponding epsilon(Hf)(t) values ranging from 1.9 to 18.3, and two-stage Hf model ages (T-DM2) of between 561 and 888 Ma. The isotope composition shows that Huanggang granites were derived from partial melting of juvenile lower crust that originated from depleted mantle, perhaps contaminated by small amounts of ancient continental crust. Younger Nd, Hf isotope model ages imply that an important crustal growth event took place in this area during the Neoproterozoic. Integrating our data with previously published results and the Late Mesozoic regional tectonic setting, we conclude that the Huanggang granites were generated in an intraplate tectonic-magmatic setting. Asthenospheric mantle upwelling due to lithospheric delamination and magma underplating, caused the partial melting of a mantle wedge metasomatized by the fluids released from subducted oceanic crust or by decompression of depleted mantle. This resulted in remelting, differentiation and a continued evolution of the mafic juvenile crust, producing a large quantity of granitic magma. The tectonic setting for these processes may be linked to the NNW subduction of the Pacific plate (Izanagi) in the Mesozoic, which affected most of eastern China. (C) 2012 Elsevier Ltd. All rights reserved.
学科主题	矿床地质
WOS关键词	U-PB AGES ; NATURAL REFERENCE MATERIAL ; CALC-ALKALINE GRANITOIDS ; LATE JURASSIC GRANITOIDS ; NORTHERN INNER-MONGOLIA ; CRUSTAL GROWTH ; EASTERN CHINA ; GEODYNAMIC SETTINGS ; CONTINENTAL-CRUST ; TONALITIC GNEISS
WOS研究方向	Geology
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000303699200019
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39561]
专题	中国地质调查局
作者单位	Commiss European Communities, L-2920 Luxembourg, Luxembourg
推荐引用方式 GB/T 7714	Zhou, ZH ,Mao, JW ,Lyckberg, P . Geochronology and isotopic geochemistry of the A-type granites from the Huanggang Sn-Fe deposit, southern Great Hinggan Range, NE China Implication for their origin and tectonic setting[J]. JOURNAL OF ASIAN EARTH SCIENCES,2012,49(特刊 SI):272-286.
APA	Zhou, ZH ,Mao, JW ,&Lyckberg, P .(2012).Geochronology and isotopic geochemistry of the A-type granites from the Huanggang Sn-Fe deposit, southern Great Hinggan Range, NE China Implication for their origin and tectonic setting.JOURNAL OF ASIAN EARTH SCIENCES,49(特刊 SI),272-286.
MLA	Zhou, ZH ,et al."Geochronology and isotopic geochemistry of the A-type granites from the Huanggang Sn-Fe deposit, southern Great Hinggan Range, NE China Implication for their origin and tectonic setting".JOURNAL OF ASIAN EARTH SCIENCES 49.特刊 SI(2012):272-286.