SILICATE GLASS AND SULFIDES IN ULTRAMAFIC XENOLITHS, NEWER BASALTS, VICTORIA, AUSTRALIA

The Newer Basalts of Victoria contain an abundance of inclusions, the majority being Iherzolites of an accidental origin. During ascent of the host magma a CO2-rich vapor phase 'boiled' off and penetrated the inclusions, resulting in ubiquitous fluid inclusions and partial melting along some fractures and intergranular boundaries. Fe+Ni+Cu sulfide globules distributed within the glass and along planes in the primary silicates apparently formed during ascent and originated with a sulfur component in the invading vapor and not with remobilization of free sulfides in the xenoliths themselves. © 1979 Springer-Verlag.