Re-examination of oxygen isotope systematics in the contact metamorphic aureole around the Tanohata plutonic complex

Abstract

Oxygen isotopic ratios are examined for metapelitic rocks in the Tanohata contact metamorphic aureole. The whole rock oxygen isotopic ratios of metapelitic rocks suggest the absence of external fluid infiltration in the side wall of the Tanohata pluton. Those in the roof pendant area are generally low, suggesting a possible involvement of external fluid from the pluton in contact metamorphism of this part of the aureole.