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Geochemical evidence for a comet shower in the late Eocene.
Science. 1998 May 22; 280(5367):1250-3.Sci

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 approximately 1 My before and ended approximately 1.5 My after the major impact events that produced the large Popigai and Chesapeake Bay craters approximately 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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Authors+Show Affiliations

Farley KA
Division of Geological and Planetary Sciences, California Institute of Technology, MS 170-25, Pasadena, CA 91125, USA. farley@gps.caltech.edu
Montanari A
No affiliation info available
Shoemaker EM
No affiliation info available
Shoemaker CS
No affiliation info available

MeSH

Cosmic DustEarth, PlanetEvolution, PlanetaryGeologic SedimentsHeliumIsotopesMeteoroids

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

9596575

Citation

Farley, K A., et al. "Geochemical Evidence for a Comet Shower in the Late Eocene." Science (New York, N.Y.), vol. 280, no. 5367, 1998, pp. 1250-3.
Farley KA, Montanari A, Shoemaker EM, et al. Geochemical evidence for a comet shower in the late Eocene. Science. 1998;280(5367):1250-3.
Farley, K. A., Montanari, A., Shoemaker, E. M., & Shoemaker, C. S. (1998). Geochemical evidence for a comet shower in the late Eocene. Science (New York, N.Y.), 280(5367), 1250-3.
Farley KA, et al. Geochemical Evidence for a Comet Shower in the Late Eocene. Science. 1998 May 22;280(5367):1250-3. PubMed PMID: 9596575.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Geochemical evidence for a comet shower in the late Eocene. AU - Farley,K A, AU - Montanari,A, AU - Shoemaker,E M, AU - Shoemaker,C S, PY - 1998/6/20/pubmed PY - 1998/6/20/medline PY - 1998/6/20/entrez SP - 1250 EP - 3 JF - Science (New York, N.Y.) JO - Science VL - 280 IS - 5367 N2 - 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 approximately 1 My before and ended approximately 1.5 My after the major impact events that produced the large Popigai and Chesapeake Bay craters approximately 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. SN - 0036-8075 UR - https://www.unboundmedicine.com/medline/citation/9596575/Geochemical_evidence_for_a_comet_shower_in_the_late_Eocene_ L2 - https://www.sciencemag.org/cgi/pmidlookup?view=long&pmid=9596575 DB - PRIME DP - Unbound Medicine ER -