Horoman peridotite body, Samani-cho, Samani-gun, Hidaka Province, Hokkaido, Japan

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Ref.: E. Takazawa et al., Journal of Petrology, V 40, N 12, December 1999, pp. 1827-1851; Morishita and S. Arai, Journal of Petrology, 2001, V 42, N 7, pp. 1279-1299.

Complex peridotite body, with three peridotite suites :
1) Harzburgite / lherzolite suite
2) Banded dunite / harzburgite suite (cumulate)
3) Spinel-rich dunite / wehrlite suite (cumulate)

The structure of the peridotite body is layered, two main zones have been distinguished :
- Upper zone (600 meter thick) : Core of an ascending mantle diapir (with thermal gradient), with plagioclase lherzolites and harzburgites, and mafic layers.
- Lower zone (2200 meter thick) : Margin of an ascending mantle diapir, with cyclic layers plagioclase lherzolite/lherzolite/harzburgite/dunite/harzburgite/lherzolite/plagioclase lherzolite (with mafic layers).

The garnet peridotite (830 Ma) grades into a plagioclase peridotite during ascension.

The Horoman peridotite is a MORB-related oceanic mantle subsided to deeper mantle depth, before crustal ascension and emplacement (23 Ma).

Mineral List

Mineral list contains entries from the region specified including sub-localities

'Albite-Anorthite Series' 'Amphibole Group' Anorthite Augite Bornite Carrollite Chalcopyrite Chromite 'Clinopyroxene Subgroup'

Copper Corundum Diopside var: Chromian Diopside Enstatite var: Bronzite Forsterite Heazlewoodite Hercynite var: Picotite

Horomanite (TL) Ilmenite Kaersutite Magnetite var: Titaniferous Magnetite 'Orthopyroxene Subgroup' Pargasite Pentlandite Phlogopite

Pyrope Pyrrhotite var: Nickeloan Pyrrhotite Samaniite (TL) 'Serpentine Group' Siegenite Spinel Sugakiite (TL) Talnakhite 'Tourmaline'

47 entries listed. 25 valid minerals. 3 type localities (valid minerals).

Localities in this Region

Japan Hokkaido Hidaka Province Samani-gun Samani-cho Horoman peridotite body Chromdiopside gabbroic granulite layer Gabbroic troctolite layer Gabbronorite layer Garnet clinopyroxenite layer Horoman mine Plagioclase websterite layer