山东栖霞大方山玄武岩中地幔熔体玻璃捕虏体岩相学及岩石化学研究

摘要

过去地学界对固体地幔岩捕虏体研究已经相当充分.另外,山东栖霞大方山还存在地幔熔体玻璃捕虏体,其化学成分、矿物成分既小同于固体地幔岩也不同于寄主玄武岩.此玻璃体特别富K,而且早于寄主岩浆,二者间很不平衡.富K玻璃捕虏体往往被玄武岩浆消化殆尽,但在野外仍然可以找到少量残留体供室内研究.此熔体玻璃的存在意味着该区玄武岩浆作用不是一元而是多元岩浆体系,还存在早一期的碱性地幔岩浆.后者消化混染于玄武岩浆之中,会产生富K玄武岩.%Besides the solid rook xenoliths in basalt, writers found the glass xenoliths, which is different from both host basalt and solid rock xenoliths. Glass xenoliths consist mainly of K-riched nepheline crystals and glass and they are unequilibrium with the Na-riched host basalt magma, enhancing the K content of basalt.