[meteorite-list] More on breccia formation

From: Bernd Pauli HD <bernd.pauli_at_meteoritecentral.com>
Date: Thu Apr 22 09:55:44 2004
Message-ID: <3C3A11CE.2C51D0F4_at_lehrer1.rz.uni-karlsruhe.de>

WELTEN K.C. et al. (1992) The Glanerbrug Breccia: Evidence for a
separate
L/LL chondritic parent body? (Meteoritics 27-3, 1992, A307, excerpts):

"On April 7, 1990, a brecciated ordinary chondrite fell through the roof
of a house near Glanerbrug in the Netherlands and was shattered to
pieces."

"Since it is not likely that the L and LL chondritic fragments
originated on a single parent body, two alternative explanations
were suggested:

(i) The light-dark structure of the Glanerbrug is a characteristic
feature of regolithic breccias, which once resided on or close to
the surface of its parent body. This lends some support to the idea
that the light portion is an exotic clast in a dark host rock or vice
versa; (ii) ..."

"Although this indicates that the dark portion once resided close to
the surface of a parent body, no solar-wind implanted noble gases
were found in a fragment consisting of both light and dark material
indicating that the Glanerbrug is a fragmental rather than a regolithic
breccia ..."


NORTON O.R. (2001) Centerpiece: Kapoeta - A Howardite
Extraordinaire (Meteorite, May 2001, Vol. 7, No. 2, pp. 22-24):

"It is a regolith breccia with a mix of diogenitic and eucritic
clasts ... Howardites are thought to be surface material or "soil"
of a differentiated parent body, namely, the asteroid 4 Vesta.


Best wishes,

Bernd
Received on Mon 07 Jan 2002 04:23:27 PM PST