Abstract
Recent structural and radiometric studies have suggested that the Shimanto Belt grades landward into part of the Sanbagawa Belt. The Sanbagawa Belt is a regional-scale belt of Cretaceous high-pressure and low-temperature metamorphic rocks that are present for hundreds of kilometers along southwest Japan. Locally, the Sanbagawa Belt preserves paleopressures equivalent to burial deeper than 30 km. The recently proposed correlation between part of this belt and the Shimanto Belt is therefore significant because it suggests that the Late Cretaceous units may preserve a relatively complete accretionary system, from very shallow levels (e.g., in the Early Tertiary to Cretaceous Shimanto Belt) to very deep levels (e.g., the high-pressure Sanbagawa Belt).
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