Abstract
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 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 formed in the upper mantle prior to entrainment and eruption.
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