Alex Shukolyukov

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High-precision mass spectrometric analysis of chromium in sediment samples from the Cretaceous-Tertiary (K-T) boundary coincident with the extinction of numerous organisms on Earth confirms the cosmic origin of the K-T phenomenon. The isotopic composition of chromium in K-T boundary samples from Stevns Klint, Denmark, and Caravaca, Spain, is different from(More)
Meteorites provide a sample of Solar System bodies and so constrain the types of objects that have collided with Earth over time. Meteorites analysed to date, however, are unlikely to be representative of the entire population and it is also possible that changes in their nature have occurred with time. Large objects are widely believed to be completely(More)
Introduction: Chronometers based on the decay of short-lived radionuclides give the opportunity to resolve time differences of less than a million years for early events in the solar system. However, with shortlived radionuclides only relative ages can be obtained. These relative ages have to be mapped onto an absolute time scale. The absolute age is(More)
Introduction: Any major impact structure should include an extraterrestrial chemical signature such as platinum group elements (PGEs). The concentration of iridium (Ir) and other noble metals in K/T boundary sediments worldwide was key to the interpretation that an impact (asteroidal or cometary) occurred 65 myr ago (1,2). For instance, some researchers(More)
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