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).
For full locality listing click here. Alternatively: Click here for heirarchical list of localities in Horoman peridotite body, Samani-cho, Samani-gun, Hidaka Province, Hokkaido Island, Japan
| 'Albite-Anorthite Series' - 5, 4, 1, 3, 6Anorthite - 2Augite - 4'Bronzite' - 5'Chromian Diopside' - 5, 1Chromite - 5'Clinopyroxene Subgroup' - 5, 2, 4, 1, 3, 6Corundum - 2Diopside - 5, 4Enstatite - 5Forsterite - 5, 2, 4, 1, 3, 6Horomanite - 5 | Ilmenite - 4Kaersutite - 4Magnetite - 1'Orthopyroxene Subgroup' - 5, 4, 1, 3, 6Pargasite - 4, 1, 6Phlogopite - 3, 6Picotite - 5Pyrope - 5Samaniite - 5'Serpentine Group' - 5Spinel - 5, 2, 4, 1, 3, 6'Titaniferous Magnetite' - 4 |
24 minerals listed.
Locality Key| 1 | Chromdiopside gabbroic granulite layer, Horoman peridotite body, Samani-cho, Samani-gun, Hidaka Province, Hokkaido Island, Japan | | 2 | Gabbroic troctolite layer, Horoman peridotite body, Samani-cho, Samani-gun, Hidaka Province, Hokkaido Island, Japan | | 3 | Gabbronorite layer, Horoman peridotite body, Samani-cho, Samani-gun, Hidaka Province, Hokkaido Island, Japan |
| | 4 | Garnet clinopyroxenite layer, Horoman peridotite body, Samani-cho, Samani-gun, Hidaka Province, Hokkaido Island, Japan | | 5 | Horoman peridotite body, Samani-cho, Samani-gun, Hidaka Province, Hokkaido Island, Japan | | 6 | Plagioclase websterite layer, Horoman peridotite body, Samani-cho, Samani-gun, Hidaka Province, Hokkaido Island, Japan |
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