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

From: Charles Viau <cviau_at_meteoritecentral.com>
Date: Thu Apr 22 10:17:43 2004
Message-ID: <000e01c3bf77$087848e0$1800a8c0_at_chupa>

"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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Received on Wed 10 Dec 2003 06:40:39 PM PST