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Metamorphic solid salt (KCl-NaCl) in quartzo-feldspathic polyphase inclusions in the Sulu ultrahigh-pressure eclogite

查看全文 作　　者：ZENG [1]LingSen;CHEN [2]ZhenYu;CHEN [3]Jing 高影响力作者 机构地区：[1]State Key Laboratory of Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences;[2]Institute of Mineral Resources, Chinese Academy of Geological Sciences;[3]School of Physics, Peking University高影响力机构 出　　处：《Chinese Science Bulletin》索引2013年第58卷第8期,共7页高影响力期刊 基　　金：supported by the SinoProbe Project (SinoProbe-2-6);the National Natural Science Foundation of China (41073024 and 40872048) 摘　　要：Unusual polyphase inclusions of K-feldspar+quartz+titanite+solid salt and K-feldspar+albite+quartz+epidote with textures similar to the other K-feldspar+quartz inclusions were found in omphacite grains from the Sulu ultrahigh pressure (UHP) eclogites. One of these inclusions contain square to round solid salt inclusions of KCl-NaCl composition. Such a mineral assemblage within K-feldspar-bearing inclusions hosted by UHP metamorphic phases suggests that (1) potassium granitic melts enriched in Cl components were presented during UHP metamorphism or at the early stage of rapid exhumation of deeply subducted continental slab; (2) they were resulted from reactions between the incoming granitic melts and quartz (or coesite); and (3) solid salt inclusions of NaCl-KCl were derived from dehydration and desiccation of Cl-bearing melts. Our new observations further demonstrate that during the tectonic evolution of UHP rocks, fertile components within deeply subducted continental materials could undergo partial melting, leading to the formation of Cl-bearing potassium granitic melts and substantial migration of fluid-conservative elements (e.g. Ti, Hf) within the UHP slab. 关 键 词：超高压榴辉岩 超高压变质 钾长石 柯石英 固体盐 氯化钠 包裹体 多相
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