Hi Folks,
From an igneous perspective, I would say that resorbtion (or
resorption) actually means corrosion of an earlier-formed crystal
(whatever its origin) by the surrounding matrix (magma in the igneous
context), without precipitation of a reaction rim (corona in
metaspeak) of new minerals. If this happens in metamorphic rocks then
use of the term resorbtion would be cognate with the igneous use. If
not (reaction products always or nearly always in evidence, forming a
corona or kelyphite?), I would suggest that the term might best be
reserved for the magmatic cases and only used in mm petrology in the
rare? cases where resorbtion (rather than reaction to solid products)
has actually occurred. That's my ignorant position.
Cheers,
JC
--
John D. Clemens
Professor of Geosciences,
Associate Dean (Research), Faculty of Science
Editor in Chief - Visual Geosciences
http://www.springeronline.com/sgw/cda/frontpage/0,10735,3-10006-70-1129605-0,00.html
School of Earth Sciences and Geography, CEESR, Kingston University,
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phone: +44 (0)20 8547-7023 fax: +44 (0)20 8547-7497
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