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Subject:

Re: SCMR and Metam Facies Names

From:

Bruce Bathurst <[log in to unmask]>

Reply-To:

No title defined <[log in to unmask]>

Date:

Tue, 13 Nov 2001 09:55:36 -0800

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (61 lines)

Dugald,

These are only recommendations,
presumably so those who choose to use
them can be understood by all.

Thus, using paper three's recommended
nomenclature, I can clearly write 'An
upward flux of dense CO2 might
metamorphose an amphibolite into a
granulite. During this prograde
metamorphism the metamorphic grade did
not change, though an isograd did move
across the rock. The facies, too, did
not change. Its name, however, did.' Of
course, you might choose not to use the
SCMR nomenclature, because it would make
your elegant study of intersecting
isograds an amusing read.

Unless petrologists are happy with this
new clarity, the SCMR committee would be
happy to hear from you. They have been
requesting criticism for four years. One
might also carefully consider Prof
Banno's suggestion of public discussion.
If the SCMR members are voting on
individual definitions, this might
explain the lack of fit of related
definitions.

Personal opinions

Within the theory of thermodynamics,
variables such as temperature & pressure
are artificial: artifacts of the design
of laboratory experiments. Perhaps
natural definitions should not use
these.

Those papers I have read have used
'grade' fundamentally as a relative
measure of the intensity of
metamorphism, using an ordered scale of
isograds. Isograds were curves on the
surface that separated (zones of)
metamorphism of higher & lower
intensity. Each was prefixed by that
observable criterion the geologist used
to make this determination. After much
mapping of this nature, geologists used
terms such as 'low grade' to
characterize the intensity of
metamorphism in a region as being lower
than usually observed.

Respectfully,


Bruce Bathurst

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