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Jean-Paul,
At 12:18 PM 11/7/2001 +0100, you wrote:
>Dear All,
>
>Then there is a standard nomenclature for metamorphic rock. Is it published
>somewhere? As John Clemens already said, the IUGS subcommission on
>metamorphic rocks nomenclature has not given yet its recommendations. In the
>field, when dealing with metamorphic rocks and several geologists, the first
>day generally consists in discussions about nomenclature to be able to
>communicate. Even for words as "gneiss" or "micaschist" this is no agreement
>(is gneiss indeed a purely textural term? what about the mylonitic
>texture?).

Particularly so since most gneisses are blastomylonites.
Frank


-------------------------------------
Frank F.  Beunk
Faculty of Earth and Life Sciences, Vrije Universiteit
Dept. of Petrology
De Boelelaan 1085, 1081 HV  Amsterdam, the Netherlands
phone +31-20-4447371
FAX    +31-20-6462457
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