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Petrologic analysis is used to determine the intensity and extent of the thermal effects of a postkinematic granite on its surrounding rocks to understand the thermal evolution of an accretionary prism in Central Kyushu, Japan. The relatively young (14 Ma) Okueyama granite represents a single magma chamber, which solidified as a zoned pluton, and is therefore suitable for the study of the thermal effects by a single heat source. The Lower Shimanto Group country rock, an accretionary prism of Cretaceous age, has undergone contact metamorphism, to form an orthopyroxene zone, cordierite zone, and biotite zone in order of decreasing metamorphic grade. Singular value decomposition (SVD) analysis of composition matrices of relevant mineral assemblages results in the following isograd reactions

american mineralogist

Contact metamorphism of a Cretaceous accretionary prism by the 14 Ma Okueyama granite, a single post-kinematic pluton in Central Kyushu, Japan: SVD analysis of metamorphic reactions and thermal release