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Macromolecular organic acids in the Murchison meteorite
This study has detected bound organic acids within the Murchison meteorite organic macromolecule. Benzoic acid was the most abundant compound; other abundant compounds include C1 and C2 benzoic acids. Their origin and significance will be discussed
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Alteration of the Nakhlite Lava Pile: was water on the surface, seeping down, or at depth, percolating up? Evidence (such as it is) from carbonates
We present carbon and oxygen isotope data on carbonates in five nakhlites and use the results to interpret the martian weathering processes
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Post-impact heating of a crater lake
Lacustrine sediments from the 24 km diameter Boltysh impact structure record the rapid formation of an intra-crater lake. Stable isotope compositions and organic maturity parameters from the lake sediments deposited post-impact show that they were heated by underlying impactites. This heating is attributed to the establishment of an impact- generated hydrothermal system. Estimates of the duration of heating are ~30 – 40 k.y. consistent with the suggestion that crater lakes extend the longevity of impact-generated hydrothermal systems
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The Boltysh crater record of rapid vegetation change during the Dan-C2 hyperthermal event
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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 melt- bearing breccias. Smectite occurrence in the breccias suggests two stages of alteration; an early hydrothermal mineralization, and a later, low temperature weathering. δD and δ18O of smectite separates are currently being measured and will be presented
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A complete high resolution record of the Dan-C2 hyperthermal event in the lacustrine sediments of the Boltysh Impact crater
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