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PRIJE 250 MILIJUNA GODINA
Zemlju pogodio meteorit veći i od 'ubojice dinosaura'

http://danas.net.hr/znanost/page/2011/10/03/1114006.html?pos=n1
http://www.astrobiology.com/news/viewpr.html?pid=19996

NASA-ini radar otkrio je krater promjera 500 kilometara, skriven oko dva
kilometra pod antarktičkim ledom, u pokrajini Wilkes Land. Više je nego
dvostruko je veći od kratera Chicxulub, koji je istrijebio dinosaure.

Istraživanja su pokazala da je ogromni krater koji je otkriven 2006.
godine nastao prije oko 250 milijuna godina, u vrijeme kada je gotovo
život na Zemlji u potpunosti nestao. Kako su procijenili stručnjaci
Američke svemirske agencije, stvorio ga je asteroid koji je bio širok
oko 50 kilometara.



Za usporedbu, PT izumiranje:
http://en.wikipedia.org/wiki/Permian%E2%80%93Triassic_extinction_event

Permian–Triassic extinction event
The Permian–Triassic (P–Tr) extinction event, informally known as the
Great Dying,[1] was an extinction event that occurred 251.4 Ma (million
years) ago,[2][3] forming the boundary between the Permian and Triassic
geologic periods. It was the Earth's most severe extinction event, with
up to 96% of all marine species[4] and 70% of terrestrial vertebrate
species becoming extinct.[5] It is the only known mass extinction of
insects.[6][7] Some 57% of all families and 83% of all genera were
killed. Because so much biodiversity was lost, the recovery of life on
Earth took significantly longer than after other extinction events.[4]
This event has been described as the "mother of all mass extinctions."[8]


Moja otprije poznata hipoteza je da je udar (tada neidentificiranog)
asteroida izazvao udarni val u zemljinom plaštu koji je interferirao na
antipodu i izazvao dugotrajnu vulkansku erupciju, s rezultatom poznatim
kao sibirske trape:

The Siberian Traps (Russian: Сибирские траппы Sibirskie trappi) form a
large region of volcanic rock, known as a large igneous province, in the
Russian region of Siberia. The massive eruptive event which formed the
traps, one of the largest known volcanic events of the last 500 million
years of Earth's geological history, continued for a million years and
spanned the Permian–Triassic boundary, about 251 to 250 million years
ago. It was essentially coincident with the Permian–Triassic extinction
event, which is estimated to have killed 90% of species existing at the
time. The eruption of the Siberian Traps is considered to be a possible
cause of this "Great Dying".


Drugi takav poznati event, na temelju kojeg sam složio hipotezu, jest
par dekanskih trapa i Chicxulub kratera, u KT eventu, i moja hipoteza je
glasila da je i sibirske trape morao izazvati asteroidni udar, samo
veći, zato što je i erupcija veća, a to je sada potvrđeno.

- -- 
http://www.danijel.org/
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