[meteorite-list] Precambrian impact ejecta blanket found in Scotland

From: Paul <bristolia_at_meteoritecentral.com>
Date: Mon, 24 Mar 2008 09:09:42 -0700 (PDT)
Message-ID: <987426.84825.qm_at_web36202.mail.mud.yahoo.com>

Amor, K., Stephen P.Hesselbo, Don Porcelli, Scott Thackrey, and
John Parnell, 2008, A Precambrian proximal ejecta blanket from
Scotland. Geology..vol. 36, no. 4, pp. 303-306.
 
In part theabstract reads:
 
?The StacFada Member of the Precambrian Stoer Group in Scotland
haspreviously been described as volcanic in origin. However,
shockedquartz and biotite provide evidence for high-pressure shock
 metamorphism, while chromium isotopevalues and elevated
abundancesof platinum group metals and siderophile elements
indicateaddition of meteoritic material. Thus, the unit is
reinterpretedhere as having an impact origin.?
 
This unit isas much as 20 meters thick in places.
 
http://www.gsajournals.org/perlserv/?request=get-abstract&doi=10.1130%2FG24454A.1


Related paper:


Young, G. M., 2002, Stratigraphy and geochemistry of volcanic
mass flows in the Stac Fada Member of the Stoer Group,
Torridonian, NW Scotland. Royal Society of Edinburgh Transactions:
Earth Sciences. vol. 93, no. 1, pp. 1-16.




 
Yours,
 
Paul H.
 





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Received on Mon 24 Mar 2008 12:09:42 PM PDT