From: [email protected]
[mailto:[email protected]] On Behalf Of Edgar L. Owen
Sent: Saturday, March 15, 2014 5:57 AM
To: [email protected]
Subject: Re: The situation at Fukushima appears to be deteriorating
All,
In terms of the Permian and Cretaceous extinctions the theory I find most
compelling in both cases is asteroid strikes whose resulting strike energies
were also focused at the antipodes. The energy of the Cretaceous strike off the
Yucatan was focused in India where it ruptured the crust resulting in the
Deccan Traps. The even larger Permian asteroid strike occurred in the South
Pacific and its energy was focused in Siberia where it ruptured the crust there
resulting in the Siberian Traps. The time frames are roughly consistent though
in both cases the traps persisted long after the asteroid strikes which
initiated them.
For the Cretaceous certainly that asteroid strike left a clear global geologic
fingerprint in the KT boundary. For the Permian event it is harder to say – as
tectonics long ago sub-ducted the crime scene – so to speak, but it seems a
reasonable hypothesis that an asteroid strike is the cause (or maybe trigger
event) for the Siberian traps, on the other hand the earth (the internal mass
of it) was significantly hotter back in the Permian era, due to higher
quantities of radioactive material that has subsequently decayed. Could the
Siberian Traps event have been caused instead by a massive rising deep mantle
plume – as has been hypothesized?
As far as I know there is still a debate going on as to the proximate cause.
Chris
So in both cases you would have double whammies whose persistent effects lasted
for much longer than the effects of the original asteroid impacts which
initiated them.
Edgar
On Saturday, March 15, 2014 1:44:49 AM UTC-4, cdemorsella wrote:
From: [email protected] <javascript:>
[mailto:[email protected] <javascript:> ] On Behalf Of John Clark
Sent: Thursday, March 13, 2014 8:29 AM
To: [email protected] <javascript:>
Subject: Re: The situation at Fukushima appears to be deteriorating
On Wed, Mar 12, 2014 at 11:40 AM, Chris de Morsella <[email protected]
<javascript:> > wrote:
>> 66 million years ago 2/3 of all species, not individual animals but entire
>> species, became extinct quite literally ove
...
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