[meteorite-list] Fusion crust observations

From: Bernd Pauli HD <bernd.pauli_at_meteoritecentral.com>
Date: Thu Apr 22 09:54:07 2004
Message-ID: <3C73C725.189E4013_at_lehrer1.rz.uni-karlsruhe.de>

Dave Harris wrote:

> Allende ... fusion crust is peppered with tiny holes

> Millbillillie crust is a solid (unperforated) glassy coat.

> EXACTLY what gases ... escaping


Hello Dave and List,

These "tiny holes" (M.M. Grady and M.J. Genge call them "vesicles")
are most abundant in the CCs but should also occur in eucrites (up to
about 50 vol%). With regard to the carbonaceous chondrites, their
occurrence suggests formation by evaporation and degassing of C, H,
S, and H2O.

Reference:

GENGE M.J. et al. (1999) The fusion crusts of stony meteorites:
implications for the atmospheric reprocessing of extraterrestrial
materials (MAPS 34-3, 1999, 341-356).


Best regards,

Bernd
Received on Wed 20 Feb 2002 10:56:21 AM PST