Postdated melting of subcontinental lithospheric mantle by the Emeishan mantle plume: Evidence from the Anyi intrusion, Yunnan, SW China

	Postdated melting of subcontinental lithospheric mantle by the Emeishan mantle plume: Evidence from the Anyi intrusion, Yunnan, SW China
	Song-Yue Yu; Xie-Yan Song; Lie-Meng Chen; Xiao-Biao Li
	2014
Source Publication	Ore Geology Reviews
Volume	57 Issue:SI Pages:560-573
Abstract	The Anyi intrusion is located in the central zone of Emeishan large igneous province (ELIP), SW China. It outcrops in an area of about 0.65 km(2) and similar to 1 km thick and dips to the southwest. The Anyi intrusion consists of a lower clinopyroxenite zone, middle gabbro zone, and an upper monzonite-syenite zone. Up to 400 m thick stratiform disseminated Fe-Ti oxide layer with grades of 16-18 wt% total Fe is hosted in the lower dinopyroxenite zone. Zircon SHRIMP U-Pb age (247 +/- 3 Ma) indicates that the Anyi intrusion represents postdated mafic magmatism resulting from the similar to 260 Ma Emeishan mantle plume. Compared with the typical oxide-bearing intrusions (such as Panzhihua and Baima) formed at similar to 260 Ma in the ELIP, the Anyi intrusion is characterized by high alkaline contents and LREE/HREE ratios, extremely low 8Nd values (-6.2 to -7.6) and moderate high (Sr-82/Sr-86); values (0.7072 to 0.7086). These characteristics of the Anyi intrusion cannot be explained by fractional crystallization or crustal contamination, but may reflect a unique enriched continental lithospheric mantle source (a mantle source mixed between garnet pyroxenite and spinet peridotite). We propose that the postdated mafic magmatism associated with the formation of the Anyi intrusion and its Fe-Ti oxide ore may be the product of melting of a mantle source mixed between garnet pyroxenite and spinet peridotite in the shallow lithosphere caused by conductive heating combined with lithosphere thinning due to plume-lithosphere interaction.
Subject Area	矿床地球化学
Indexed By	SCI
Language	英语
Document Type	期刊论文
Identifier	http://ir.gyig.ac.cn/handle/352002/5158
Collection	矿床地球化学国家重点实验室_矿床地球化学国家重点实验室_期刊论文
Recommended Citation GB/T 7714	Song-Yue Yu,Xie-Yan Song,Lie-Meng Chen,et al. Postdated melting of subcontinental lithospheric mantle by the Emeishan mantle plume: Evidence from the Anyi intrusion, Yunnan, SW China[J]. Ore Geology Reviews,2014,57(SI):560-573.
APA	Song-Yue Yu,Xie-Yan Song,Lie-Meng Chen,&Xiao-Biao Li.(2014).Postdated melting of subcontinental lithospheric mantle by the Emeishan mantle plume: Evidence from the Anyi intrusion, Yunnan, SW China.Ore Geology Reviews,57(SI),560-573.
MLA	Song-Yue Yu,et al."Postdated melting of subcontinental lithospheric mantle by the Emeishan mantle plume: Evidence from the Anyi intrusion, Yunnan, SW China".Ore Geology Reviews 57.SI(2014):560-573.

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