Intergranular basaltic melt is distributed in thin, elongated inclusions

Details Intergranular basaltic melt is distributed in thin, elongated inclusions Intergranular basaltic melt is distributed in thin, elongated inclusions

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21...29f&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 1, p. 29-32

Physics

Geophysics

76

Basalt, Crystals, Earth Mantle, Inclusions, Mechanical Properties, Melting, Olivine, P Waves, Spatial Distribution, Aspect Ratio, Ellipsoids, Geochemistry, Geophysics, Graphs (Charts), Seismology

Scientific paper

We describe a method to analyze the melt distribution in experimentally produced ultramafic partial melts. It is shown that the melt inclusions can be approximated by ellipses in two dimensions. The aspect ratios of these ellipses (the ratio of the minor to the major axis) can in turn be used to calculate bulk-physical properties of partial melts. We apply this method to two olivine-basalt samples with 3.2% and 0.75% melt fraction. In the samples analyzed approximately 75% of the melt is contained in inclusions with much smaller aspect ratios than triple junction tubules. The reduction of P-wave velocities calculated for this melt distribution is twice as large as for melt distributed solely in triple junction tubules.

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