[meteorite-list] Paleocene/Eocene Comet Impact?

From: Paul <lenticulina1_at_meteoritecentral.com>
Date: Thu Apr 22 10:31:56 2004
Message-ID: <20040102192657.77671.qmail_at_web60810.mail.yahoo.com>

Dear Friends,

There is an interesting paper about a
hypothesis about a possible comet impact
at that caused the Paleocene/Eocene
thermal maximum in:

D. V. Kent, B. S. Cramer, L. Lanci, D. Wang,
J. D. Wright and R. Van der Voo, 2003, A
case for a comet impact trigger for the
Paleocene/Eocene thermal maximum and carbon
isotope excursion. Earth and Planetary Science
Letters. vol. 211, no. 1-2, pp. 13-26

http://adsabs.harvard.edu/cgi-bin/nph-bib_query?2003E&PSL.211...13K

"We hypothesize that the rapid onset of the
carbon isotope excursion (CIE) at the
Paleocene/Eocene boundary (~55 Ma) may have
resulted from the accretion of a significant
amount of 12C-enriched carbon from the
impact of a ~10 km comet, an event that
would also trigger greenhouse warming
leading to the Paleocene/Eocene thermal
maximum and, possibly, thermal dissociation
of seafloor methane hydrate.

There is a discussion and reply about this
hypothesis in:

Gerald R. Dickens and Jason M. Francis,
2003, Comment on "A case for a comet impact
trigger for the Paleocene/Eocene thermal
maximum and carbon isotope excursion"
by D.V. Kent et al. [Earth Planet. Sci.
Lett. 211 (2003) 13-26]. Earth
and Planetary Science Letters. vol. 217,
no. 1-2, pp. 197-200.

and

D. V. Kent, B. S. Cramer, L. Lanci, D. Wang,
J. D. Wright and R. Van der Voo, 2003,
Reply to a comment on "A case for a comet
impact trigger for the Paleocene/Eocene
thermal maximum and carbon isotope excursion"
by G.R. Dickens and J.M. Francis. Earth and
Planetary Science Letters. vol. 217, no. 1-2,
pp. 201-205.

For more information:

PGeophysical Research Abstracts, Vol. 5, 05203, 2003
c European Geophysical Society 2003
THE PALEOCENE-EOCENE THERMAL
MAXIMUM: PALEOCEANOGRAPHIC AND
PALEOECOLOGICAL IMPLICATIONS

http://www.cosis.net/abstracts/EAE03/05203/EAE03-J-05203.pdf

http://gsa.confex.com/gsa/2001AM/finalprogram/abstract_25292.htm

http://www.geo.uni-bremen.de/FB5/geochron/Robert/RPSpeb.html

Yours,

Paul
Baton Rouge, LA


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Received on Fri 02 Jan 2004 02:26:57 PM PST