Partial melting and electrical conductivity anomalies beneath the Japan and Philippine seas

Details Partial melting and electrical conductivity anomalies beneath the Japan and Philippine seas Partial melting and electrical conductivity anomalies beneath the Japan and Philippine seas

Jun 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975pepi...10..128h&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 10, Issue 2, p. 128-134.

Physics

9

Scientific paper

Geomagnetic variation anomalies observed in the central part of Japan can be accounted for by highly conducting layers having a conductivity of 0.5 S/m or thereabouts beneath the Japan and Philippine seas. High temperature may be a possible cause of such layers if we take into account that temperature amounts to 1,000°C at a depth of 40 km beneath the areas of high heat flow in the Japan and Philippine seas. It seems difficult, however, to account for a conductivity of 0.5 S/m which is unusually high at a depth of 50 km or so by means of high temperature only. We can interpret such a high conductivity in terms of partial melting of peridotite in the upper mantle, provided highly conducting molten material is interconnected. This is in good agreement with the interpretation of low-velocity zones beneath the Japan and Philippine seas in terms of a partial melting of 4-6%. Present address: Division of Geomagnetism, Earth Physics Branch, Department of Energy, Mines and Resources, Ottawa, Ont., Canada.

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