JonnyMcA Wrote:
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> Over the last number of decades there has been a
> debate over the cause of the Extinction event 66
> Million years ago (the so called Cretaceous
> Tertiary (K-T) extinction event as it was known,
> or the Cretaceous Palaeogene (K-P) extinction
> event as it is now being referred to due .). The
> two main arguments was whether it was caused by a
> large 10km asteroid/comet impact, or whether it
> was caused by massive volcanism of the Deccan
> Traps.
>
> Some research suggests that the dinosaurs were in
> already in decline leading, but surviving right up
> to the K-P event. Conclusively it was the K-P
> event that was the critical horizon. Recent
> research demonstrates that the Deccan traps began
> erupting around 67.4 Million years ago, and again
> around 66.1 million years ago , lasting into the
> Palaeogene (which on geological scales means it
> was practically a continuous event across the K-P
> boundary). The asteroid impact has been dated to
> around 66.04 million years ago.
>
> Some research published in 2020 now suggests that
> in actual fact, the Deccan traps may have reduced
> the climatic effects of the asteroid impact (see
> [
www.pnas.org]).
> The impact would have caused abrupt, prolonged
> severe climate cooling (an impact winter) lasting
> many years (estimates vary from a few years to a
> decade), but that carbon dioxide released by the
> Deccan Traps volcanism caused a global warming
> effect, which helped reduce the effect of the
> impact. The point made was that the extinction
> event could have been a lot worse if not for the
> concurrent volcanism at the time.
>
> The debate as to the cause of the extinction event
> has swung back and forth, and will probably still
> continue to do so, but the general consensus is
> that it was the Asteroid impact that ultimately
> caused the relatively sudden extinction event.
>
> I am not entirely sure what you mean by "explosion
> of gravitational spheres". I presume this is due
> to translation, and you are perhaps referring to
> supernova, i.e. exploding stars that sometimes
> leave behind compact gravitational objects like
> Neutron stars or black holes (or another type of
> supernova which is an exploding compact white
> dwarf star). IN either case, a close enough
> supernova could cause an increase in cosmic
> radiation and cause an extinction event. This was
> once considered as a mechanism for the K-P
> extinction, but given the extent of evidence of a
> large asteroid impact, the supernova hypothesis is
> no longer considered to be the cause.
>
> So long story short. current thinking is Asteroid
> impact most likely caused the K-P extinction
> event, Volcanoes did not, but they may or may not
> have contributed.
>
> Jonny
Very interesting. You really knows what you are saying.
I am very impressed
Cintia Panizza
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"Happiness is only real when shared."
Christopher McCandless