Olaf and all,
In my view, these do not qualify as regional metamorphic rocks. Best to
let the facies concept work here.
Eric
>Dear all;
>
>"Regional contact metamorphism" always seems to stir debate, but it is a
>very useful term in certain settings. This discussion has focussed on
>aureoles around plutons, but my own experience is from dense mafic dyke
>swarms (>50% dykes), in which the wallrock is reduced to thin screens
>between dykes. These screens consist of hornfelses, and since some of the
>dyke swarms I work with cover large areas (the Sarek Dyke Swarm in the
>northern Swedish Caledonides has an areal extent of c. 2,000 km2), any
>other term than "regional" for this contact metamorphism would be
>misleading, don't you agree?
>
>However, the concept of "contact metamorphic facies" is not something I
>have even thought about; it's still interesting to follow the discussion.
>
>Best regards/vänliga hälsningar,
>
>Olaf
>
>
>---------------------------------*-----------------------------------
> Olaf M. Svenningsen, Ph.D
>Geological Institute Lund University
>Sölvegatan 13 phone (int'l): +46-46-222 42 98
>S-223 62 LUND e-mail: [log in to unmask]
>
> http://www.geol.lu.se/personal/OLFS/Shome.xtm
>---------------------------------*-----------------------------------
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