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Three-dimensional model of heat flow in the aureole
of the Marcy anorthosite, Adirondack Highlands, New York: Implications
for depth of emplacement
J. Alcock1, Kevin Myer2,
and P. D. Muller3
1Penn State, Abington, Abington, PA, 19001 <jea4@psu.edu>
2Penn State, University Park, PA, 16802 *
3SUNY Oneonta, Oneonta, NY, 13820, <mullerpd@oneonta.edu>
(Received April 1, 1999; Published September 22, 1999)
Abstract
The New Russia gneiss complex occurs within a broad, very high temperature
(800-950 °C)
metamorphic aureole against the eastern margin of the Marcy anorthosite,
northeastern
Adirondack Highlands of New York. Three-dimensional models of heat
flow from the anorthosite indicate that an aureole like that preserved
in the New Russia gneisses would form if the country rock were at high
temperature (> 700 °C) and at depth prior to intrusion. These findings
are consistent with geobarometric evidence indicating that partial melting
in the aureole occurred at 700-1000 MPa and support the hypothesis that
the anorthosite intruded at a depth of 25 to 35 km.
Keywords: Marcy anorthosite, Adirondack Highlands, contact metamorphism,
conductive heating, finite-difference models.
* Current Address: University of Washington, Seattle, WA 98105
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the full paper (260 K).
Copyright ©1999 by the Mineralogical Society
of America
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