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Title:
Time Scales of Critical Events Around the Cretaceous-Paleogene Boundary
Authors:
Renne, Paul R.; Deino, Alan L.; Hilgen, Frederik J.; Kuiper, Klaudia F.; Mark, Darren F.; Mitchell, William S.; Morgan, Leah E.; Mundil, Roland; Smit, Jan
Affiliation:
AA(Berkeley Geochronology Center (BGC), 2455 Ridge Road, Berkeley, CA 94709, USA), AB(Berkeley Geochronology Center (BGC), 2455 Ridge Road, Berkeley, CA 94709, USA), AC(Faculty of Geosciences, Department of Earth Sciences, Utrecht University, Budapestlaan 4, 3584 CD Utrecht, Netherlands), AD(Faculty of Earth and Life Sciences, Institute of Earth Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1085, 1081 HV Amsterdam, Netherlands), AE(Scottish Universities Environmental Research Centre, Rankine Avenue, East Kilbride, G75 0QF, UK), AF(Department of Earth and Planetary Science, University of California, Berkeley, CA, 94720, USA.; Department of Chemistry, University of California, Berkeley, CA, 94720, USA), AG(Scottish Universities Environmental Research Centre, Rankine Avenue, East Kilbride, G75 0QF, UK), AH(Berkeley Geochronology Center (BGC), 2455 Ridge Road, Berkeley, CA 94709, USA), AI(Faculty of Earth and Life Sciences, Institute of Earth Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1085, 1081 HV Amsterdam, Netherlands)
Publication:
Science, Volume 339, Issue 6120, pp. 684-687 (2013). (Sci Homepage)
Publication Date:
02/2013
Category:
GEOCHEM PHYS Ecology, Paleontology, Geochemistry
Origin:
SCIENCE
Abstract Copyright:
(c) 2013: Science
DOI:
10.1126/science.1230492
Bibliographic Code:
2013Sci...339..684R

Abstract

Mass extinctions manifest in Earth's geologic record were turning points in biotic evolution. We present 40Ar/39Ar data that establish synchrony between the Cretaceous-Paleogene boundary and associated mass extinctions with the Chicxulub bolide impact to within 32,000 years. Perturbation of the atmospheric carbon cycle at the boundary likely lasted less than 5000 years, exhibiting a recovery time scale two to three orders of magnitude shorter than that of the major ocean basins. Low-diversity mammalian fauna in the western Williston Basin persisted for as little as 20,000 years after the impact. The Chicxulub impact likely triggered a state shift of ecosystems already under near-critical stress.
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