The Takadomari Serpentinites in the Kamuikotan Ophiolite Belt, Hokkaido, Japan
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概要
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Within the Kamuikotan Ophiolite Belt, a large serpentinite mass more than 10×12 km is observed around Takadomari as a tectonic unit of dismembered ophiolite. The Takadomari serpentinites show an east-facing layered structure composed primarily of dunite, harzburgite, and olivine-orthopyroxenite layers. More than 120 dykes of microdiorite-microgabbro were found in the serpentinite mass and clearly show an intrusive relation. The serpentinization is characterized by a progressive crystallization of antigorite replacing lizardite and chrysotile serpentines crystallized retrogressively. The Takadomari mass is regarded as a dismembered ophiolite unit which is situated at the base of the Horokanai ophiolite complex. High pressure and low temperature type metamorphic rocks such as glaucophane schist are considered to be a tectonic unit lifted up by the Takadomari serpentinites.
- 北海道大学 = Hokkaido Universityの論文