Sanidine-olivine-diopside Association in a Metasomatized Garnet Lherzolite Xenolith from Southeastern China

查看全文 作　　者：[1]曹荣龙;[1]朱寿华;[2]K.AOKI;[2]H.FUJIMAKI 机构地区：[1]Institute of Geochemistry,Academia Sinica,Guangzhou Branch,Guangzhou,510640;[2]Institute of Mineralogy,Petrology,and Economic Geology,Tohoku University,Sendai,Japan 出　　处：《Chinese Journal Of Geochemistry》索引1992年第11卷第1期,共15页 摘　　要：A garnet lherzolite xenolith hosted in olivine nephelinite from Xilong,Zhejiang Province ,southeastern China, shows clear evidence of modal metasomatism involving a special sanidine-olivine-diopside(SOD) association which was produced by replacement of primary orthopyroxene.The fluid responsible for the measomatism was a silica-undersaturated vapour,rich in K,Ba,Sr and Ti.It is suggested that the SOD assemblage is the product of metasomatism of a depleted lherzolite precursor,and formed in the upper mantle prior to entrainment and eruption. 关 键 词：透长石 橄榄石 透辉石 交代变质作用 石榴石 铬尖晶石 捕虏体 中国