[meteorite-list] Asteroid Impacts May Have Triggered Plate Tectonics

[Jerry]

I guess my musings and Vicki Hansen's researched hypothesis aren't related, 
in time anyway.
My musing only takes into account the fact that the Connecticut River 
Valley, 100 miles from the coast, is thought to be the result a collision of 
ancient plate boundaries.
The fact the the much later break-up occurred not there, at the Berkshire 
Mountains margin, but 100+ miles from the CRV,  just made me wonder if 
another mechanism might be at work.
Granted, the coastal region, at least where glacial debris has not cover it 
up, is host to a string of ancient extinct volcanoes 30 miles south of 
Boston through the Canadian Provinces across the Atlantic through the Celtic 
isles into Scandinavia. And the "brittle" nature of these lavas may be 
provide sufficient explanation for the modern continental configuration 
given appropriate stresses applied through the mechanism of tectonics.
But musing doesn't cost much and cataclysm "of the mind" doesn't hurt.
Jerry Flaherty
----- Original Message ----- 
From: "Paul" <bristolia at yahoo.com>
To: <meteorite-list at meteoritecentral.com>
Sent: Wednesday, January 16, 2008 1:05 PM
Subject: [meteorite-list] Asteroid Impacts May Have Triggered Plate 
Tectonics


Meteor Pelting May Have Triggered Plate Tectonics
Larry O'Hanlon, Discovery News

http://dsc.discovery.com/news/2007/12/10/meteors-earth.html
http://dsc.discovery.com/news/2007/12/10/meteors-earth-print.html

Hansen , V. L., 2007, Subduction origin on early Earth: A hypothesis.
Geology. vol. 35, no. 12, pp.  1059-1062

http://www.gsajournals.org/perlserv/?request=get-abstract&doi=10.1130%2FG24202A.1

Yours,

Paul H.


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