Shock metamorphism of Bosumtwi impact crater rocks, shock attenuation, and uplift formation

Ludovic Ferrière, Christian Koeberl, Boris A. Ivanov, Wolf Uwe Reimold

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34 Scopus citations

Abstract

Shock wave attenuation rate and formation of central uplifts are not precisely constrained for moderately sized complex impact structures. The distribution of shock metamorphism in drilled basement rocks from the 10.5-kilometer-diameter Bosumtwi crater, and results of numerical modeling of inelastic rock deformation and modification processes during uplift, constrained with petrographic data, allowed reconstruction of the pre-impact position of the drilled rocks and revealed a shock attenuation by ∼5 gigapascals in the uppermost 200 meters of the central uplift. The proportion of shocked quartz grains and the average number of planar deformation feature sets per grain provide a sensitive indication of minor changes in shock pressure. The results further imply that for moderately sized craters the rise of the central uplift is dominated by brittle failure.

Original languageEnglish (US)
Pages (from-to)1678-1681
Number of pages4
JournalScience
Volume322
Issue number5908
DOIs
StatePublished - Dec 12 2008

Bibliographical note

Copyright:
Copyright 2009 Elsevier B.V., All rights reserved.

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