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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Cao, R., Zhu, S., Aoki, K. et al. Sanidine-olivine-diopside association in a metasomatized garnet lherzolite xenolith from southeastern China. Chin. J. of Geochem. 11, 55–69 (1992). https://doi.org/10.1007/BF02875658
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DOI: https://doi.org/10.1007/BF02875658