Compressibility of molten “green glass” and crystal-liquid density crossovers in low-Ti lunar magma

Details Compressibility of molten “green glass” and crystal-liquid density crossovers in low-Ti lunar magma Compressibility of molten “green glass” and crystal-liquid density crossovers in low-Ti lunar magma

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997gecoa..61.2139s&link_type=abstract

Geochimica et Cosmochimica Acta, Volume 61, Issue 10, p. 2139-2145.

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Scientific paper

Density measurements of molten Apollo 15 “green glass” have been performed in the pressure range 0.5 3.5 GPa using the floating and sinking spheres technique in piston-cylinder and multi-anvil devices. A density crossover with equilibrium orthopyroxene is predicted for green glass at 3.5 GPa, or ˜800 km depth in the lunar interior. Equilibrium olivine should be neutrally buoyant in molten green glass at a pressure slightly greater (5 GPa) than the lunar core value of ˜4.7 GPa. At the olivine-orthopyroxene cotectic (˜2.0 GPa), molten green glass is less dense than both crystalline phases. Thus, the results are consistent with models that propose generation and buoyant rise of green glass magma from the depth of the olivine-orthopyroxene cotectic in the lunar interior. Molten green glass has a compression curve slope of 0.093 g/cc/GPa, along the liquids, in the pressure range investigated. The values of the Birch-Murnaghan isothermal bulk modulus (K) and the pressure derivative of the bulk modulus (K′) at 1645°C are described by the relationship K (GPa) =19.5/(1 - (0.25-0.063 K′)). Combining this relationship with a calculated isothermal bulk modulus value of 18 GPa, derived from 1-atm ultrasonic measurements, gives K′ = 5.3 for molten green glass.

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