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.
