Teyssier y Whitney, 2002 Gneiss domes and orogeny

Teyssier y Whitney, 2002 Gneiss domes and orogeny -...

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Geology doi: 10.1130/0091-7613(2002)030<1139:GDAO>2.0.CO;2 2002;30;1139-1142 Geology Christian Teyssier and Donna L. Whitney Gneiss domes and orogeny Email alerting services cite this article to receive free e-mail alerts when new articles www.gsapubs.org/cgi/alerts click Subscribe to subscribe to Geology www.gsapubs.org/subscriptions/ click Permission request to contact GSA http://www.geosociety.org/pubs/copyrt.htm#gsa click viewpoint. Opinions presented in this publication do not reflect official positions of the Society. positions by scientists worldwide, regardless of their race, citizenship, gender, religion, or political article's full citation. GSA provides this and other forums for the presentation of diverse opinions and articles on their own or their organization's Web site providing the posting includes a reference to the science. This file may not be posted to any Web site, but authors may post the abstracts only of their unlimited copies of items in GSA's journals for noncommercial use in classrooms to further education and to use a single figure, a single table, and/or a brief paragraph of text in subsequent works and to make GSA, employment. Individual scientists are hereby granted permission, without fees or further requests to Copyright not claimed on content prepared wholly by U.S. government employees within scope of their Notes Geological Society of America on 22 October 2009 geology.gsapubs.org Downloaded from
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q 2002 Geological Society of America. For permission to copy, contact Copyright Permissions, GSA, or editing@geosociety.org. Geology; December 2002; v. 30; no. 12; p. 1139–1142; 2 figures. 1139 Gneiss domes and orogeny Christian Teyssier Donna L. Whitney Department of Geology and Geophysics, University of Minnesota, Minneapolis, Minnesota 55455, USA ABSTRACT Many gneiss domes record positive feedback between decompression and partial melting of orogenic middle crust. Exhumed orogens are riddled with gneiss domes cored by mig- matites that underwent dehydration melting during decompression. The decreasing buoy- ancy associated with increasing melt fraction drives further decompression at near- isothermal conditions as the partially molten crust rises diapirically. This combination of processes may explain the generation and retention of large volumes of crustally derived melt recorded in many deep-seated migmatite terranes and inferred for active orogens. In exhumed orogens, the signature of the rapid ascent of partially molten crust is a gneiss dome cored by migmatite 6 granite. The large volume of material involved in the vertical transfer of partially molten crust indicates that the formation of gneiss domes is an effi- cient mechanism for heat advection during orogenesis. Keywords: gneiss dome, orogeny, decompression, partial melting.
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