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Impact production of CO_2 by the Cretaceous/Tertiary extinction bolide and the resultant heating of the Earth

O'Keefe, John D. and Ahrens, Thomas J. (1989) Impact production of CO_2 by the Cretaceous/Tertiary extinction bolide and the resultant heating of the Earth. Nature, 338 (6212). pp. 247-249. ISSN 0028-0836. http://resolver.caltech.edu/CaltechAUTHORS:20141103-110311009

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Abstract

Evidence at the Cretaceous/Tertiary boundary suggests that the proposed 'extinction' bolide struck a continental or shallow marine terrane. This evidence includes: shocked quartz and feldspar grains found in the boundary layer inherited from a range of rock types; a high ^(87)Sr/^(86)Sr ratio in some planktonic fossils which could reflect continental-derived Sr(ref.5); and evidence that the platinum-group-element-rich clay layer is underlain (at some localities) by a deposit of possible tsunamic origin. These observations and data demonstrate that sea level at the end of the Cretaceous was ~150-200 m higher than at present, suggesting the possibility that the extinction bolide struck a shallow marine carbonate-rich sedimentary section. Here we show that the impact of such a bolide (~5km in radius) onto a carbonate-rich terrane would increase the CO_2 content of the atmosphere by a factor of two to ten. Additional dissolution of CO_2 from the ocean's photic zone could release much larger quantities of CO_2. The impact induced release of CO_2, by itself, would enhance atmospheric greenhouse heating and give rise to a worldwide increase in temperature from 2 K to 10 K for periods of 10^4 to 10^5 years.


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http://www.nature.com/nature/journal/v338/n6212/abs/338247a0.htmlPublisherArticle
http://dx.doi.org/10.1038/338247a0DOIArticle
Alternate Title:Impact production of CO2 by the Cretaceous/Tertiary extinction bolide and the resultant heating of the Earth
Additional Information:© 1989 Nature Publishing Group. Received 26 September 1988; accepted 31 January 1989. This work has benefitted from technical reviews of M. A. Arthur, J. Kasting and F. Hörz and discussions with A. Fisher, J. Kasting, S. Savin, R. Prinn, R. V. Krishnamurthy, J. Tyburczy and D. Stevenson. Research supported by NASA.
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Record Number:CaltechAUTHORS:20141103-110311009
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20141103-110311009
Official Citation:Impact production of C02 by the Cretaceous/Tertiary extinction bolide and the resultant heating of the Earth John D. O'Keefe & Thomas J. Ahrens doi:10.1038/338247a0 pp. 247-249
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51174
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:03 Nov 2014 20:29
Last Modified:03 Nov 2014 20:29

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