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Mantle peridotites exposed on the Earth s surface are fossilized mantle materials. Records of pressure-temperature-deformation histories (P-T-d-t paths) preserved in mantle peridotites reveal dynamic motion within the mantle with association of deformation, changes in pressure and temperature, and magma-related processes. Reconstruction of such P-T-d-t paths for mantle peridotites backward from the moment of fossilization through exhumation as far back in time as possible, will expand the current understanding of the long-term dynamic behavior of the mantle. The Horoman peridotite complex in the southern Hidaka metamorphic belt of Hokkaido, Japan, has long been examined using various approaches to decode past P-T-d-t paths recorded in the peridotite and mafic rocks.Here we critically review previous work related to reconstructions of P-T-d-t paths for the Horoman peridotite complex, and use the data to outline the dynamic history of the complex from the oldest events until their final ascent leading to emplacement within the crust.

This paper critically reviews pressure estimation methods for spinel peridotite xenoliths that are frequently included in Phanerozoic alkali basalts. Geobarometries used for pressure ranges in the stability field of spinel peridotites are critically examined and problems clarified. A guide to the solutions to these problems and methods for improving the reliability and accuracy of geobarometers for spinel peridotites are presented. Methods for the validation of estimated pressures are proposed, based on estimates of the time taken for the transport of xenoliths from depth to the surface.