Abstract
We report a characteristic melt-related texture of spinel clast in ultramafic pseudotachylyte. The texture consists of rounded corona-like rim, composed of chromian spinel particles and some interstitial material, which may surround aluminous spinel. The coronas increase their thickness in proportion to distance of each spinel clast from vein wall. Lattice orientation of spinel grains in corona is similar to that of the core aluminous spinel. These indicate partial dissolution of spinel clast in high-temperature frictional melt. The roundness of spinel clast including the corona increases proportionally to the distance of spinel clast from wall. This indicates melt temperature above 1300-1500 degreeC.
