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Published online by Cambridge University Press: 01 May 2009
A metamorphosed basic tuff and a felsite and a felsite intrusion are described. Presence of laminar structure in the matrix of the tuff and of veinlets of tuff penetrating and acid xenolith enclosed in the tuff indicates that the fragmental assemblage moved in a manner similar in final effect to fluid injection. A felsite-tuff which grades into the felsite is thought to be the remnant of the emplaced material subsequently metasomatized in situ to produce the felsite.