Metamorphic evolution of the Kamuikotan high-pressure and low- temperature metamorphic rocks in central Hokkaido, Japan

M. Sakakibara, T. Ota

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Abstract

The Kamuikotan complex in the Sorachi-Yezo belt has been extensively subjected to subduction-related high-pressure and low-temperature metamorphism. On the basis of geological, petrological, and geochronological data, the coherent metamorphic rocks are divided into six units which can be classified into the following three baric types: high-pressure 1, high-pressure 2, and high-pressure intermediate. The results, together with the previously published K-Ar and 40Ar-39Ar ages, suggest that the Kamuikotan metamorphic rocks gradually decreased in pressure during the Cretaceous. This tendency indicates an increase in the Kamuikotan subduction geotherm during Early Cretaceous to early Eocene time. -from Authors

Original languageEnglish
JournalJournal of Geophysical Research B: Solid Earth
Volume99
Issue numberB11
Publication statusPublished - 1994
Externally publishedYes

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ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Environmental Science(all)

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