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2017 ; 7
(1
): 14855
Nephropedia Template TP
gab.com Text
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English Wikipedia
Site of asteroid impact changed the history of life on Earth: the low probability
of mass extinction
#MMPMID29123110
Kaiho K
; Oshima N
Sci Rep
2017[Nov]; 7
(1
): 14855
PMID29123110
show ga
Sixty-six million years ago, an asteroid approximately 9?km in diameter hit the
hydrocarbon- and sulfur-rich sedimentary rocks in what is now Mexico. Recent
studies have shown that this impact at the Yucatan Peninsula heated the
hydrocarbon and sulfur in these rocks, forming stratospheric soot and sulfate
aerosols and causing extreme global cooling and drought. These events triggered a
mass extinction, including dinosaurs, and led to the subsequent macroevolution of
mammals. The amount of hydrocarbon and sulfur in rocks varies widely, depending
on location, which suggests that cooling and extinction levels were dependent on
impact site. Here we show that the probability of significant global cooling,
mass extinction, and the subsequent appearance of mammals was quite low after an
asteroid impact on the Earth's surface. This significant event could have
occurred if the asteroid hit the hydrocarbon-rich areas occupying approximately
13% of the Earth's surface. The site of asteroid impact, therefore, changed the
history of life on Earth.