SETI bioastro: Fw: Earth's Volcanism Linked To Meteorite Impacts

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From: LARRY KLAES (ljk4@msn.com)
Date: Thu Dec 12 2002 - 11:07:06 PST


----- Original Message -----
From: Ron Baalke
Sent: Thursday, December 12, 2002 12:46 PM
To: ljk4@msn.com
Subject: Earth's Volcanism Linked To Meteorite Impacts

http://www.newscientist.com/news/news.jsp?id=ns99993171

Earth's volcanism linked to meteorite impacts
New Scientist
December 11, 2002

Large meteorite impacts may not just throw up huge dust clouds but also
punch right through the Earth's crust, triggering gigantic volcanic
eruptions.

The idea is controversial, but evidence is mounting that the
Earth's geology has largely been driven by such events. This would
also explain why our planet has so few impact crater remnants.

Most volcanoes come from small amounts of the Earth's upper mantle
boiling over, but mantle-plume volcanoes happen when hot rock
from deep within the Earth's mantle shoots straight up through
the Earth's crust. The timing suggests that these volcanoes are
related to asteroid impacts, Abbott and Isley report in Earth and
Planetary Science Letters (vol 205, p 53).

Full story here:

http://www.newscientist.com/news/news.jsp?id=ns99993171

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