[meteorite-list] Permian-Triassic Extinction Not Impact Related

From: Pekka Savolainen <pekka.savolainen_at_meteoritecentral.com>
Date: Thu Apr 22 10:17:44 2004
Message-ID: <3FD80892.3040501_at_dlc.fi>

Well, can aggree. At least the abstract doesnīt say anything about the
high Ir in the
K/T-boundry. Donīt know the background of these scientists, but it might
be more
from (mare) chemistry than from geology. Just my 2 cents...;-

http://www.icdp-online.de/sites/chicxulub/ICDP-Chix/CHIC-ICDP_KTB-PAGE.html

http://www.icdp-online.de/sites/chicxulub/news/news.html

take care,

pekka s

Charles Viau wrote:

>"It wasn't the gun that killed him, it was the bullet that went through
>his heart.."
>
>What part of the study explained how such a flourishing ecosystem
>suddenly went so wrong. So many young scientists making headline news by
>concentrating on secondary concequences...
>
>CharlyV
>
>-----Original Message-----
>From: meteorite-list-admin_at_meteoritecentral.com
>[mailto:meteorite-list-admin_at_meteoritecentral.com] On Behalf Of Paul
>Sent: Wednesday, December 10, 2003 1:48 PM
>To: meteorite-list_at_meteoritecentral.com
>Subject: [meteorite-list] Permian-Triassic Extinction Not Impact Related
>
>A recently published paper argues that the
>Permian-Triassic extinction was not caused
>by an asteroid or comet impact. The paper is:
>
>E. Heydari and J. Hassanzadeh. 2003, Deev
>Jahi Model of the Permian-Triassic boundary
>mass extinction: a case for gas hydrates as
>the main cause of biological crisis on
>Earth. vol. 163, no.1-2, pp. 147-163
>(15 December 2003)
>
>The abstract concluded:
>
>"The study suggests that prior to
>cement precipitation, the PTB ocean
>was charged with CO2, warm, had low
>oxygen, high Ca2+, and high HCO3-
>concentrations. These conditions
>collectively created stressful
>conditions causing the marine mass
>mortality. The leakage of CH4 to
>the atmosphere produced a super-hot
>climate resulting in the biological
>devastation on land. The proposed
>kill mechanism is developed on the
>basis of the physical clue--the
>cement layer--left behind by the
>killing process--the change in
>ocean chemistry."
>
>Yours,
>
>Paul
>Baton Rouge, LA
>
>
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-- 
Pekka Savolainen
Jokiharjuntie 4
FIN-71330 Rasala
FINLAND
+ 358 400 818 912
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Received on Thu 11 Dec 2003 01:02:58 AM PST