Before dinosaurs' era, volcanic eruptions triggered mass extinction

Mar 22, 2013 Full story: Earth & Sky 6

More than 200 million years ago, a massive extinction decimated 76 percent of marine and terrestrial species, marking the end of the Triassic period and the onset of the Jurassic.

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“Geologist [I'm Climate Change]”

Since: Mar 07

formerly Nuneaton

#1 Mar 25, 2013
This is a very impressive article.

In large part because it implies that the Central Atlantic Magmatic province (camp), was one of the largest basalt plateaux on Earth. With all the continents Jammed together in a pre Atlantic state it would cover all the S. part of the Variscan range where Africa collided with the E. part of N. America with the N.part in Nova Scotia and the S. part in N.Brazil.

This would put it on a par in size with the Ontong Java (now in 3 pieces with only one piece still visible), and the Siberian traps. The reason in that case why the extinction was smaller than End Permian was because @ that time the climate mode was likely #3 rather than the locked in mode#2 of the End Permian. This would have resulted under climate mode#3 (more efficient cooling mechanism) in a global high temperature about 2 degrees c cooler than under climate mode#2 under the same CO2 load.

What is also interesting is that this basalt plateau sits directly on top of the Afro American part of the Variscan range. Here there were numerous carboniferous pre Variscan coal deltas (still being mined in the USA). The basalt plateaux are generally generated by the results of smelt reactions between diamond and Fe & Ni bearing minerals in the core mantle boundary. This plateaux indicates that the deep ocean mud subducted in the close of the variscan range formation went down to the core & came straight back up again.
This also implies that very little continental drift of Afro/Amercan Pangaea occurred during that timespan.

Have a nice day: Ag
PHD

Overton, TX

#2 Mar 25, 2013
Yes indeed they do imply. More scientific science fiction. They really don't know just imply.

“Geologist [I'm Climate Change]”

Since: Mar 07

formerly Nuneaton

#3 Mar 25, 2013
PHD wrote:
Yes indeed they do imply. More scientific science fiction. They really don't know just imply.
The implication is because to get all the bits done all the bits must be in place. It is rather hard to do when the bulk of the neighbours are shooting at you.

The bulk of the USA is known about but the Africa side has by & large been eroded and also has a serious problem with aggressive begging, robbery, theft and all out plain murder.

In the USA the bulk of the basalt province has also been eroded out by the way. The bulk of the magmatic province survives nowadays via diabase (basalt) sills in the outskirts of the main province. The bulk of the dikes feeding the basalt flows are also rather hard to find as they are underwater & covered by sediment. If the oil industry (influenced & Bush & Cheney even now) stopped shooting @ geologists, these basalt dikes may actually be seen via exploration seismic lines & an occasional ODP deep drill record.

Have a nice day: Ag
Lord Vader Garfield

Honolulu, HI

#4 Mar 25, 2013
Are you guys back in time of dinosaurs, in the continent of Pangea?
PHD

Overton, TX

#5 Mar 27, 2013
Adrian Godsafe MSc wrote:
<quoted text>
The implication is because to get all the bits done all the bits must be in place. It is rather hard to do when the bulk of the neighbours are shooting at you.
The bulk of the USA is known about but the Africa side has by & large been eroded and also has a serious problem with aggressive begging, robbery, theft and all out plain murder.
In the USA the bulk of the basalt province has also been eroded out by the way. The bulk of the magmatic province survives nowadays via diabase (basalt) sills in the outskirts of the main province. The bulk of the dikes feeding the basalt flows are also rather hard to find as they are underwater & covered by sediment. If the oil industry (influenced & Bush & Cheney even now) stopped shooting @ geologists, these basalt dikes may actually be seen via exploration seismic lines & an occasional ODP deep drill record.
Have a nice day: Ag
Yes indeed untill all the bits are together it's still scienctific science fiction. You have a great day.
anny

Alcoy, Spain

#7 Mar 28, 2013
I have come to the conclusion that we all have a little blame global warming and its consequences and guilt even more politicians who do not slow down.

http://www.globalwarmingweb.com

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