The Miocene serpentinite-derived clastic rocks in Soeushinai area in Horokanai Town, northern Hokkaido, Japan

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Key Points

To investigate the composition and origins of clastic rocks in the Soeushinai area of Horokanai Town.
Analysis of sedimentary structures from the Chikubetsu Formation in the Soeushinai area.
Identification of fossil content and provenance of clastic material through mineral composition studies.
Comparative examination of surrounding geological formations including the Kamikotan metamorphic complex and the Horokanai ophiolite.
The clastic rocks are primarily composed of coarse-grained gravel and sandstone containing large fossils.
Provenance studies suggest that the clasts originate mainly from serpentinite and chromian spinels, with contributions from the Kamikotan metamorphic complex.
Additional constituents include a range of amphibole grains, hinting at volcanic origins.

Examines clastic rocks containing fossils in northern Japan, revealing geological origins and implications.

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Kanazawa et al. (2026) studied this question.

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