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Detailed vitrinite reflectance and illite crystallinity paleothermal data from a portion of the Eocene-Oligocene Shimanto accretionary prism in southwest Japan show that: (1) peak paleotemperatures range from ∼200°C (diagenetic zone) in the northern part of the study area to ∼300°C (anchizone) 10 km to the south. Preliminary bo data from illite (Underwood and others, this volume) suggest that these rocks were buried no more than 10 km. This in turn implies that the Eocene-Oligocene Shimanto Belt experienced a relatively high paleogeothermal gradient of at least 30 to 40°C/km. (2) Shales with the best-developed pressure solution cleavages also record the...

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