Heck, if it's a catchy title, why not something like "A DEEPER look at
contact metamorphism" or "Deeper Contact!"
Doh! Sorry silly me, it has to sound intellectual doesn't it.
The term seems OK actually, reasonably descriptive and not too cryptic.
-----Original Message-----
From: Grenville Draper <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: 20 May 1999 15:28
Subject: Tilting at aureoles
>
>Dear All,
>
>Never in my dreams did I ever expect to stir up such a hornet's nest! Now
>I understand why I was never accepted in to the diplomatic service. But
>I've learned a great deal from the exchange (including that Al's a great
>guy).
>
>My original question was really for a convenient phrase to use in a paper
>title (actually it was a grant proposal). What I've learned is that, to
>paraphrase Shakespeare, "the facies is the thing". At the risk of starting
>another shouting match, it would seem that contact metamorphism is
>metamorphism that immediately surrounds a localized magmatic heat source
>(whatever the depth). Since the presence of such an aureole is defined by
>field relations and mapping it is a structural term rather than a
>petrologic one.
>
>One could qualify "contact metamorphism" by using a petrologic adjective -
>the obvious the highest temperature facies developed adjacent to the
>pluton. Thus contact metaorphism at shallow levels could be called, for
>example, "pyroxene-hornfels contact metamorphism". Intrusion at deeper
>levels would produce - again for example "amphibolite contact metamorphism"
>( the example that started all this and ?the one to use in my
>paper/proposal)
>
>In the cases where no contact aureole can be detected and mapped, then this
>is regional metamorphism because the heat source, even if ultimately from
>magmatic sources is not localized enough to produce an aureole structure.
>
>Or am I tilting at aureoles?? (thereby referring to the Bard and Cervantes
>in the same communication which is appropriate given my heritage and
>present affiliation).
>
>
>Gren
>
>(Granpueblo)
>
>
>
>
>**************************************************************************
>
> Grenville Draper
>
>
> Feb 1999 to June 1999 on sabbatical leave at:
> Area Geodinámica
> Departamento de Geología
> Universidad de Salamanca
> 37008 Salamanca
> SPAIN Tel (34) - 932-294482 Fax (34) - 932-294540
>
> Department of Geology
> Florida International University
> Miami, FL 33199,
> USA Tel 305-348-3087 FAX 305-348-3877
>
>
>**************************************************************************
>
>
>
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