85 GPa Shock Recovery Experiments on Granitic Rock Samples: On the Development of Extremely Heterogeneous 'Biotite' Impact Melt Glass

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Biotite, Glass: Impact Melt, Impact Melt, Shock Recovery: Experiments

Scientific paper

Granitic whole rock samples have been shocked experimentally at 85 GPa using a high explosive device in order to investigate impact induced melting phenomena. The recovered samples were analysed using optical microscopy, REM and electron microprobe techniques. Here, we concentrate on the shock melting behaviour of biotite. Two chemically different melt glasses have been observed, one with a high density of vesicles and an extremely heterogeneous element distribution, the other, more dense glass still showing the composition of the unshocked reference biotite. The occurrence of fine particles, which probably represent magnetite, implies that experimentally shocked biotite undergo incongruent melting like biotite in naturally shocked rocks.

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