Zhamanshin astrobleme provides evidence for carbonaceous chondrite and post-impact exchange between ejecta and Earth’s atmosphere

Tomáš Magna (), Karel Žák, Andreas Pack, Frédéric Moynier, Bérengère Mougel, Stefan Peters, Roman Skála, Šárka Jonášová, Jiří Mizera and Zdeněk Řanda
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Tomáš Magna: Czech Geological Survey
Karel Žák: Institute of Geology of the Czech Academy of Sciences
Andreas Pack: Universität Göttingen
Frédéric Moynier: Université Paris Diderot
Bérengère Mougel: Université Paris Diderot
Stefan Peters: Universität Göttingen
Roman Skála: Institute of Geology of the Czech Academy of Sciences
Šárka Jonášová: Institute of Geology of the Czech Academy of Sciences
Jiří Mizera: Nuclear Physics Institute of the Czech Academy of Sciences
Zdeněk Řanda: Nuclear Physics Institute of the Czech Academy of Sciences

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: Abstract Chemical fingerprints of impacts are usually compromised by extreme conditions in the impact plume, and the contribution of projectile matter to impactites does not often exceed a fraction of per cent. Here we use chromium and oxygen isotopes to identify the impactor and impact-plume processes for Zhamanshin astrobleme, Kazakhstan. ε54Cr values up to 1.54 in irghizites, part of the fallback ejecta, represent the 54Cr-rich extremity of the Solar System range and suggest a CI-like chondrite impactor. Δ17O values as low as −0.22‰ in irghizites, however, are incompatible with a CI-like impactor. We suggest that the observed 17O depletion in irghizites relative to the terrestrial range is caused by partial isotope exchange with atmospheric oxygen (Δ17O = −0.47‰) following material ejection. In contrast, combined Δ17O–ε54Cr data for central European tektites (distal ejecta) fall into the terrestrial range and neither impactor fingerprint nor oxygen isotope exchange with the atmosphere are indicated.

Date: 2017
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DOI: 10.1038/s41467-017-00192-5

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