OSTRACODS OF POST-CRATER SEDIMENTS IN THE BOLTYSH IMPACT STRUCTURE (UKRAINIAN SHIELD)

The Boltysh impact crater, Ukraine: smectites from the crater-fill suevites

The Boltysh crater has an entire suite of crater-fill impactites preserved, including two impact meltbearing breccias. Smectite occurrence in the breccias suggests two stages of alteration; an early hydrothermal mineralization, and a later, low temperature weathering. δD and δO of smectite separates are currently being measured and will be presented.

Impact glasses and the groundmass of the boltysh impact crater suevites

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