New Simulation Supports Chicxulub Impact Scenario
نویسندگان
چکیده
منابع مشابه
Chicxulub impact ejecta from Albion Island, Belize
Impact ejecta from the Albion Formation are exposed in northern Belize. The ejecta come from the outer portion of the continuous ejecta blanket of the Chicxulub crater, which is located 360 km to the northwest. The basal unit of the Albion Formation is a 3⁄41-m-thick clay and dolomite spheroid bed composed of up to four discrete flows. The clay spheroids are altered impact glass, and the dolomi...
متن کاملClimatic effects of the Chicxulub impact ejecta
Examining the short and long term effects of the Chicxulub impact is critical for understanding how life developed on Earth. While the aftermath of the initial impact would have produced harmful levels of radiation sufficient for eradicating a large portion of terrestrial life, this process does not explain the concurrent marine extinction. Following the primary impact, a large quantity of smal...
متن کاملNumerical Modeling of Impact-induced Hydrothermal Activity at the Chicxulub
Introduction: A hypervelocity impact of a large bolide results in a significant but localized temperature increase in the planetary crust, initiating hydrothermal activity if water or ice are present. Evidence of this activity has been observed at several terrestrial craters in the form of alteration mineral assemblages, fraction-ated isotopic compositions, and fluid inclusion chemistry [e.g., ...
متن کاملCondensation from the Plume of an Oblique Chicxulub Impact
Introduction: In 1999 we calculated the production of spinel-bearing silicate liquid droplets from the condensing fireball produced in the Chicxulub Cretaceous/Tertiary impact [1], based on predicted plume compositions for 4 vertical impacts [2]. Recent calculations for oblique impacts [3], following only the first 5 post-impact seconds, predict the contributions of impactor [4], continental cr...
متن کاملNOx production and rainout from Chicxulub impact ejecta reentry
The Chicxulub impact 66.0Ma ago initiated the second biggest extinction in the Phanerozoic Eon. The cause of the concurrent oceanic nitrogen isotopic anomaly, however, remains elusive. The Chicxulub impactor struck the Yucatán peninsula, ejecting 2 × 10 kg of molten and vaporized rock that reentered globally as approximately 10 microscopic spherules. Here we report that modern techniques indica...
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ژورنال
عنوان ژورنال: Eos
سال: 2018
ISSN: 2324-9250
DOI: 10.1029/2018eo097623