The High-Pressure Assemblage Majorite-Pyrope Solid Solution + Magnesiowustite: A New Constraint on the High Pressure and Temperature History of Shock Melt Veins in Chondrites

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Magnesiowustite, Majorite-Pyrope, Regimes: High-Pressure, Ringwoodite, Veins: Shock

Scientific paper

Two coexisting distinct high pressure assemblages were discovered in shock melt veins of the Sixiangkou (L6) chondrite: (1) majorite-pyrope(sub)ss + magnesiowustite and (2) ringwoodite + low-Ca majorite. The majorite-pyrope(sub)ss + magnesiowustite evidently crystallized from a dense melt of bulk Sixiangkou composition that was produced by shock-fusion under high pressures and temperatures, whereas ringwoodite and low-Ca majorite in the second assemblage were formed by solid state transformation of olivine and low-Ca pyroxene originally present in the meteorite. The two high pressure assemblages indicate a duration over a time on the order of seconds under a high pressure (20-24 GPa) and high temperature (2050-2300 degrees C) regime.

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