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

作　　者：曹荣龙 朱寿华 K.AOKI 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》1992年第1期55-69,共15页中国地球化学学报

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.A garnet Iherzolite xenolith hosted in olivine nephelinite from Xilong,Zhejiang Province, southeastern China,shows clear evidence of modal metasomatism involving a special sanidine-olivme-diopside(SOD)association which was produced by replacement of primary orthopyroxene,The fluid responsible for the metasomatism 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 formcd 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 

分 类 号：P578.94[天文地球—矿物学]