Farley, K. A. and Montanari, A. and Shoemaker, E. M. and Shoemaker, C. S. (1998) Geochemical Evidence for a Comet Shower in the Late Eocene. Science, 280 (5367). pp. 1250-1253. ISSN 0036-8075. doi:10.1126/science.280.5367.1250. https://resolver.caltech.edu/CaltechAUTHORS:20121205-085724991
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Abstract
Analyses of pelagic limestones indicate that the flux of extraterrestrial helium-3 to Earth was increased for a 2.5-million year (My) period in the late Eocene. The enhancement began ∼1 My before and ended ∼1.5 My after the major impact events that produced the large Popigai and Chesapeake Bay craters ∼36 million years ago. The correlation between increased concentrations of helium-3, a tracer of fine-grained interplanetary dust, and large impacts indicates that the abundance of Earth-crossing objects and dustiness in the inner solar system were simultaneously but only briefly enhanced. These observations provide evidence for a comet shower triggered by an impulsive perturbation of the Oort cloud.
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| Additional Information: | © 1998 American Association for the Advancement of Science. Received 13 January 1998; accepted 27 March 1998. We thank P. Weissman for a constructive and thoughtful review and D. Patterson and K. Robinson for assistance with sample preparation. Supported by NASA and by the David and Lucille Packard Foundation through a fellowship award to K.A.F. | |||||||||
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| Issue or Number: | 5367 | |||||||||
| DOI: | 10.1126/science.280.5367.1250 | |||||||||
| Record Number: | CaltechAUTHORS:20121205-085724991 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20121205-085724991 | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 35810 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Tony Diaz | |||||||||
| Deposited On: | 05 Dec 2012 19:17 | |||||||||
| Last Modified: | 09 Nov 2021 23:17 |
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