Highly refractory peridotites in Songshugou, Qinling orogen: Insights   into partial melting and melt/fluid-rock reactions in forearc mantle

doi:10.1016/j.lithos.2016.03.002

CORC > 北京大学 > 地球与空间科学学院

	Highly refractory peridotites in Songshugou, Qinling orogen: Insights into partial melting and melt/fluid-rock reactions in forearc mantle
	Cao, Yi ; Song, Shuguang ; Su, Li ; Jung, Haemyeong ; Niu, Yaoling
刊名	LITHOS
	2016
关键词	Peridotite Partial melting Melt/fluid-rock reaction Forearc mantle Subduction zone Qinling orogen SUTURE ZONE IMPLICATIONS CENTRAL CHINA PODIFORM CHROMITITES ABYSSAL PERIDOTITES TECTONIC EVOLUTION SUBDUCTION ZONE CHROMIAN SPINEL SOUTHERN TIBET MINERAL INCLUSIONS LAYERED INTRUSIONS
DOI	10.1016/j.lithos.2016.03.002
英文摘要	The Songshugou ultramafic massif is located in the eastern segment of the Qinling orogenic belt, central China. It is a large spinel peridotite body dominated by coarse-grained, porphyroclastic, and fine-grained dunite with minor harzburgite, olivine clinopyroxenite, and banded/podiform chromitite. The compositions of the bulk rock dunite and harzburgite, and the constituent olivine and spinel, together with the textures and chemical characteristics of multiphase mineral inclusions, point to the highly refractory nature of these rocks with complex histories of high-temperature boninite melt generation and boninitic melt-rock reaction, probably in a young, warm, and volatile-rich forearc lithospheric mantle setting. Additionally, a subsequent low-temperature fluid rock reaction is also recorded by TiO2-rich spinel with Ti solubility/mobility enhanced by chloride- or fluoride rich subduction-zone fluids as advocated by Rapp et al. (2010). The olivine clinopyroxenite, on the other hand, was likely crystallized from a residual boninitic melt that had reacted with harzburgitic residues. The ubiquitous occurrences of hydrous minerals, such as anthophyllite, tremolite, Cr-chlorite, and serpentine (stable at lower PT crustal conditions) in the matrix, suggest that further low-temperature fluid-rock reaction (or retrograde metamorphism) has affected the original volatile-poor peridotites either in a mature and cool subduction zone, or in a continental crust during their exhumation into the Qinling collisional orogeny at early Paleozoic era, or both. The prolonged and intense ductile/brittle deformation can decrease the mineral grain size through dynamic recrystallization and fracturing, and thus aid the fluid-rock reaction or retrograde metamorphism and mineral chemical re-equilibration processes. Therefore, the Songshugou peridotites present a good example for understanding the petrogenesis and evolution of the mantle wedge, with the emphasis on the complex partial melting and melt/fluid-rock interactions in the forearc setting. (c) 2016 Elsevier B.V. All rights reserved.; Major State Basic Research Development Projects [2015CB856105]; National Natural Science Foundation of China [41572040, 41372060, 40825007, 41121062]; Mid-career Researcher Program through NRF - MEST [2015R1A2A1A15052305]; BK21 + postdoctoral fellowship; SCI(E); ARTICLE; caoyi@snu.ac.kr; sgsong@pku.edu.cn; 234-254; 252
语种	中文
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/438236]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Cao, Yi,Song, Shuguang,Su, Li,et al. Highly refractory peridotites in Songshugou, Qinling orogen: Insights into partial melting and melt/fluid-rock reactions in forearc mantle[J]. LITHOS,2016.
APA	Cao, Yi,Song, Shuguang,Su, Li,Jung, Haemyeong,&Niu, Yaoling.(2016).Highly refractory peridotites in Songshugou, Qinling orogen: Insights into partial melting and melt/fluid-rock reactions in forearc mantle.LITHOS.
MLA	Cao, Yi,et al."Highly refractory peridotites in Songshugou, Qinling orogen: Insights into partial melting and melt/fluid-rock reactions in forearc mantle".LITHOS (2016).