[meteorite-list] Shattercone?

From: Bernd V. Pauli <bernd.pauli_at_meteoritecentral.com>
Date: Sun, 9 Jan 2011 16:34:18 +0000
Message-ID: <DIIE.0000001700000829_at_10.0.100.101>

Hello Larry, Elton, and List,

"Can a particular shattercone be linked to a specific event?"

Yes, it can - at least with regard to the rocks they are made of!

a) Shatter cones (or one word: shattercones) from the Steinheim Basin,
   Germany or from the Sierra Madera structure in western Texas were
   formed from fine-grained limestone so that their structures (striations)
   are particulrly well developed.

b) Shatter cones from the Wells Creek Basin, Tennessee are made
   of dolomite rock.

c) Along the southern margin of the Sudbury Basin shatter ones are made
   of the so-called Mississagi quartzite.

d) Shatter cones from Gosses Bluff in Australia are made of quartzite, too.

Shatter cones form in all kinds of target rocks but the coarser the rocks
the cruder the shatter cones and the larger their striations.

Huge shatter cones have been located in a cliff along a wave-cut shoreline
on Patterson island, one of the islands in the Slate Islands impact structure,
Lake Superior, Canada (the one pictured on p. 39 of 'Traces of Catastrophe'
measures at least 7 meters at the eposed base but Bevan says that its true
width may even exceed 20 m at its base!).

References:

O.R. Norton (2002) The Cambridge Encyclopedia of Meteorites, pp. 291-294.
B.M. French (1998) Traces of Catastrophe (LPI Contribution No. 954, pp. 36-41).

Best wishes,

Bernd (in Germany)

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Received on Sun 09 Jan 2011 11:34:18 AM PST