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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.
In the ultrahigh-pressure eclogites of the East China Sea, polyclonal inclusions, such as K-feldspar + quartz + feldspar and potash feldspar + albite + quartz and epidote, are rare in omphacite.These inclusions and pure potassium Feldspar + quartz polycrystalline inclusions have a similar structure.Under the K-feldspar + albite + quartz + epidote polycrystalline inclusions, square and round potassium chloride-sodium chloride (NaCl-KCl) Solid inclusions. The development of solid inclusions in salt-bearing feldspars polycrystalline inclusions indicates that during the ultrahigh-pressure metamorphism or early rapid reenforcement of the EHE eclogites, there is a Cl-rich potassic granitic melt , The potash melt reacts with quartz (or coesite) and omphacite to form a combination of potassium feldspar + quartz albite ± 榍 ± epidote.The dewatering and drying of the chlorinated melt leads to the formation of sodium chloride - The formation of NaCl-KCl solid inclusions also shows that the deep subduction of the continental crust material may have partially melted to form chlorine-containing potassium melt and promote the migration of conservative elements (Ti, Hf, etc.) .