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Highly refractory peridotites in Songshugou, Qinling orogen: Insights into partial melting and melt/fluid-rock reactions in forearc mantle
Cao, Yi1,2; Song, Shuguang1; Su, Li3; Jung, Haemyeong2; Niu, Yaoling4,5
2016-05-01
发表期刊LITHOS
卷号252页码:234-254
文章类型Article
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.
关键词Peridotite Partial Melting Melt/fluid-rock Reaction Forearc Mantle Subduction Zone Qinling Orogen
DOI10.1016/j.lithos.2016.03.002
收录类别SCI
语种英语
WOS记录号WOS:000374599800017
引用统计
文献类型期刊论文
版本出版稿
条目标识符http://ir.qdio.ac.cn/handle/337002/131049
专题海洋地质与环境重点实验室
作者单位1.Peking Univ, Sch Earth & Space Sci, MOE Key Lab Orogen Belts & Crustal Evolut, Beijing 100871, Peoples R China
2.Seoul Natl Univ, Sch Earth & Environm Sci, Tectonophys Lab, Seoul 151747, South Korea
3.China Univ Geosci, Geol Lab Ctr, Beijing 100083, Peoples R China
4.Univ Durham, Dept Earth Sci, Durham DH1 3LE, England
5.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China
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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,2016,252:234-254.
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,252,234-254.
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 252(2016):234-254.
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