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科学通报  2012 

苏鲁超高压榴辉岩长英质多晶包裹体中盐类固体包裹体

, PP. 2972-2979

Keywords: 长英质多晶包裹体,盐类固体包裹体,榴辉岩,超高压变质作用,苏鲁超高压带

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Abstract:

在江苏东海超高压榴辉岩中,绿辉石中发育罕见的钾长石+石英+榍石和钾长石+钠长石+石英+绿帘石等多晶包裹体.这些包裹体和纯钾长石+石英多晶包裹体具有类似的结构.在钾长石+钠长石+石英+绿帘石多晶包裹体发现方块状和浑圆状氯化钾-氯化钠(NaCl-KCl)固体包裹体.在含钾长石多晶包裹体中发育盐类固态包裹体表明在超高压变质期间或在超高压榴辉岩快速折返早期,存在富含Cl的钾质花岗质熔体,钾质熔体与石英(或柯石英)和绿辉石反应形成钾长石+石英±钠长石±榍石±绿帘石组合.含氯熔体的脱水干化作用导致氯化钠-氯化钾(NaCl-KCl)固体包裹体的形成.同时表明,发生深俯冲的大陆地壳物质可能发生过部分熔融,形成含氯的钾质熔体,促进保守元素(Ti,Hf等)的迁移.

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