Compressibility of molten high-Ti mare glass: Evidence for crystal-liquid density inversions in the lunar mantle

Details Compressibility of molten high-Ti mare glass: Evidence for crystal-liquid density inversions in the lunar mantle Compressibility of molten high-Ti mare glass: Evidence for crystal-liquid density inversions in the lunar mantle

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996gecoa..60.2709c&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 60, Issue 14, pp.2709-2720

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Static compression density measurements of molten Apollo 14 black glass have been performed at liquidus conditions in the pressure range 1.0-11.5 GPa. A range of values for the Birch-Murnaghan isothermal bulk modulus ( K 2173 K = 13-23 GPa) and the pressure derivative ( dK / dP = 7-3, respectively) fit the data within the uncertainties; K 2173 K = 15.5 GPa and dK / dP = 5.2 provides the best fit to the four measured pressure-density pairs corrected to isothermal conditions. The ultramafic high-Ti mare glass is significantly more compressible than other ultrabasic and basic silicate liquids previously studied. The compressibility appears to be related to TiO 2 content. The Apollo 14 black glass sample has the highest TiO 2 content of the pristine mare glasses, which are thought to be primary melts from a differentiated and strongly heterogeneous lunar mantle. Our density measurements confirm the prediction that molten black glass will be denser than equilibrium olivine and orthopyroxene at pressures greater than ~2.0 and ~0.5 GPa, respectively. These density inversions correspond to depths greater than approximately 410 and 100 km in the lunar mantle. Since orthopyroxene replaces olivine at ~1.5 GPa (300 km) on the liquidus, our results constrain the maximum depth of buoyancy for high-Ti magmas at <400 km in the lunar mantle.

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