Society for Popular Astronomy

Earth's big freezes
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Author:  brian livesey [ Fri Mar 15, 2019 1:03 pm ]
Post subject:  Earth's big freezes

Current theories about Earth's ice ages are that they are caused by variations in the obliquity of Earth's axis and eccentricity changes in our planet's orbit around the Sun ( known as Milankovitch cycles ).
Now there's a new kid on the block. Researchers at MIT are saying that huge seismic events in equatorial regions have caused global temperatures to plummet. Colliding tectonic plates have left large areas of oceanic rock exposed that can cool the planet.
The researchers claim that, due to higher temperatures in the tropics, a chemical reaction was triggered that caused the oceanic rocks to absorb massive amounts of carbon dioxide from the atmosphere, which in turn brought a drastic reduction in temperatures and an ice age. The gas absorbing rocks are exposed as "sutures" in the mountain ranges that are formed by colliding tectonic plates.
Geologist Dr. Oliver Jagoutz at MIT, who led the research team, said: "We found that every time there was a peak in the suture zone in the tropics, there was a glaciation event. So every time you get, say, 10,000km of sutures in the tropics, you get an ice age."

Author:  Brian [ Fri Mar 15, 2019 6:58 pm ]
Post subject:  Re: Earth's big freezes

WoW! Got a reference to this please? Cheers,

Author:  brian livesey [ Mon Mar 18, 2019 10:39 am ]
Post subject:  Re: Earth's big freezes

Here's the source material: .

Author:  Brian [ Mon Mar 18, 2019 7:34 pm ]
Post subject:  Re: Earth's big freezes

Sorry Brian, I get "page not found". I tried a search but no joy there either,


Author:  brian livesey [ Tue Mar 19, 2019 11:56 am ]
Post subject:  Re: Earth's big freezes

Okay Brian, just type in: "MIT and ice ages".

Author:  Brian [ Wed Mar 20, 2019 8:18 pm ]
Post subject:  Re: Earth's big freezes

Got it this time :) . Many thanks,

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