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Journal of Petrology | Volume 45 | Number 2 | Pages 235-252 | 2004
© Oxford University Press 2004; all rights reserved

Possible Non-melted Remnants of Subducted Lithosphere: Experimental and Geochemical Evidence from Corundum-Bearing Mafic Rocks in the Horoman Peridotite Complex, Japan

TOMOAKI MORISHITA1,2,*, SHOJI ARAI3 and DAVID H. GREEN1

1 RESEARCH SCHOOL OF EARTH SCIENCES, THE AUSTRALIAN NATIONAL UNIVERSITY, CANBERRA, ACT 0200, AUSTRALIA
2 GRADUATE SCHOOL OF NATURAL SCIENCE AND TECHNOLOGY, KANAZAWA UNIVERSITY, KAKUMA, KANAZAWA 920-1192, JAPAN
3 DEPARTMENT OF EARTH SCIENCES, KANAZAWA UNIVERSITY, KAKUMA, KANAZAWA 920-1192, JAPAN

* Corresponding author. E-mail: moripta{at}kenroku.kanazawa-u.ac.jp

We report experimental results and whole-rock trace-element characteristics of a corundum-bearing mafic rock from the Horoman peridotite complex, Japan. Coronitic textures around corundum in the sample suggest that corundum was not stable in mafic rock compositions during the late-stage P–T conditions recorded in the complex (P < 1 GPa, T < 800°C). Based on the experimental results, corundum is stable in aluminous mafic compositions at pressures of 2–3 GPa under dry conditions, suggesting that the corundum-bearing mineral assemblages developed under upper-mantle conditions, probably within the surrounding peridotite. Variations in the trace-element compositions of the corundum-bearing mafic rock and related rocks can be controlled by modal variations of plagioclase, clinopyroxene and olivine, suggesting that they formed as gabbroic rocks at low-pressure conditions, and that the corundum-bearing mafic rock was derived from a plagioclase-rich protolith. A complex P–T trajectory, involving metamorphism of the plagioclase-rich protolith at a pressure higher than that at which it was first formed, is needed to explain the origin of the corundum-bearing mafic rocks. They show no evidence for partial melting after their formation as low-pressure cumulates. The Horoman complex is an example of a large peridotite body containing possible remnants of subducted oceanic lithosphere still retaining their original geochemical signatures without chemical modification during subduction and exhumation.

KEY WORDS: Horoman; mafic rock; corundum; experiment; P–T history; recycling


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