Electrical conductivity profiles and implications for the absence or presence of partial melting beneath central and southeast Australia

Details Electrical conductivity profiles and implications for the absence or presence of partial melting beneath central and southeast Australia Electrical conductivity profiles and implications for the absence or presence of partial melting beneath central and southeast Australia

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pepi...25..419l&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 25, Issue 4, p. 419-428.

Physics

27

Scientific paper

A previous paper presented measurements by Australian magnetometer arrays of Earth response to the magnetic daily-variation source field, and interpreted these data by simple representative models of one-dimensional structure found by ``forward model-fitting''. This paper now supplements the earlier interpretation by seeking to clarify the ranges of acceptable models which fit the data; that is, to demonstrate the extent of the non-uniqueness of the interpretation. Searches for models which fit the data have been carried out on both a systematic and a random basis, with similar results.
The major conclusion of the earlier paper is confirmed; that there is a substantial difference in conductivity structure between central and southeast Australia. Beneath central Australia, the structure is consistent with a traditional continental geotherm and published laboratory measurements on the temperature dependence of the electrical conductivity of recognized upper-mantle crystalline olivine materials. Beneath southeast Australia, a higher conductivity by an order of magnitude in the depth range 200-300 km is most directly interpreted in terms of a small degree (perhaps 5%) of basalt melt.
Such a partial-melt zone under southeast Australia is consistent with previous natural electromagnetic measurements for the area; has earlier and independently been indicated by a variety of seismic studies; and correlates with proposed thermal models which involve crustal intrusion from some sub-lithospheric magma source.

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