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首页> 外文期刊>Journal of Asian earth sciences >Petrogenesis of volcanic rocks in the Sangxiu Formation, central segment of Tethyan Himalaya: A probable example of plume-lithosphere interaction
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Petrogenesis of volcanic rocks in the Sangxiu Formation, central segment of Tethyan Himalaya: A probable example of plume-lithosphere interaction

机译：特提斯喜马拉雅山中段桑秀组火山岩成岩作用：羽-岩圈相互作用的可能例子

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摘要

The ～133 Ma volcanic rocks of Sangxiu Formation are distributed in the eastern part of the central Tethyan Himalaya and belong paleogeographically to the northeastern margin of Greater India. These volcanic rocks include alkaline basalts and felsic volcanic rocks. Major and trace element abundances and whole-rock isotopic data for selected samples of these volcanic rocks are used to infer their petrogenesis. Geochemically, the Sangxiu basalts are closely similar to the Emeishan high-Ti basalts. Major and trace element data and Sr-Nd isotopic compositions suggest that the Sangxiu basalts may have been derived from an OIB-type mantle source, with discern-able contributions from subcontinental lithospheric mantle (SCLM). The basaltic magmas may have formed as a result of the infiltration of plume-derived melts into the base of the lithosphere in a continental rift setting. The Sangxiu felsic volcanic rocks share most of the geochemical features of A-type granite, and have Sr-Nd isotopic compositions which differ considerably from the Sangxiu basalts, suggesting that they originated from the anatexis of ensialic continental crust. The Sangxiu volcanic rocks may be considered as the consequence of an interaction between the Kerguelen hotspot and the lithosphere of the northeastern margin of Greater India at ～133 Ma, and may represent the initial stage of the separation of Greater India from southwestern Australia.
机译：桑秀组的〜133 Ma火山岩分布在特提斯喜马拉雅山中部的东部，古地理上属于大印度东北缘。这些火山岩包括碱性玄武岩和长英质火山岩。这些火山岩的选定样本的主要和微量元素丰度以及整岩同位素数据可用于推断其成岩作用。在地球化学上，桑秀玄武岩与峨眉山高钛玄武岩极为相似。主要和微量元素数据以及Sr-Nd同位素组成表明，桑秀玄武岩可能源自OIB型地幔源，次大陆岩石圈地幔（SCLM）具有明显的贡献。在大陆裂谷环境中，羽状熔岩渗透到岩石圈底部可能形成了玄武岩浆。桑秀长石质火山岩具有A型花岗岩的大部分地球化学特征，并且具有Sr-Nd同位素组成，与桑秀玄武岩有很大的不同，这表明它们起源于西亚大陆壳的后缘。桑丘火山岩可能是Kerguelen热点与大印度东北缘岩石圈（约133 Ma）相互作用的结果，可能代表了大印度与澳大利亚西南部分离的初期。

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