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- W2070060377 abstract "Research Article| July 01, 1996 Mantle underplating, granite tectonics, and metamorphic P-T-t paths Rosalyn G. Warren; Rosalyn G. Warren 1Department of Geology, Australian National University, Canberra, ACT 0200, Australia Search for other works by this author on: GSW Google Scholar David J. Ellis David J. Ellis 1Department of Geology, Australian National University, Canberra, ACT 0200, Australia Search for other works by this author on: GSW Google Scholar Geology (1996) 24 (7): 663–666. https://doi.org/10.1130/0091-7613(1996)024<0663:MUGTAM>2.3.CO;2 Article history first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Rosalyn G. Warren, David J. Ellis; Mantle underplating, granite tectonics, and metamorphic P-T-t paths. Geology 1996;; 24 (7): 663–666. doi: https://doi.org/10.1130/0091-7613(1996)024<0663:MUGTAM>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Arrival of mantle-derived magma at the base of the continental crust leads to melting, major crustal reworking, and overturn; these processes can form both counterclockwise and high-T clockwise pressure-temperature-time (P-T-t) paths in the same tectonic episode. Regions with low-P, high-T counterclockwise P-T-t paths form where the upper crust moves down to compensate for the upward ascent of granite. High-T shear zones separate these regions from ascending granite plutons and their migmatitic envelopes, where mediumto high-pressure rocks record rapid uplift along a clockwise P-T-t path. The increase in pressure in counterclockwise P-T-t paths does not require tectonic thickening of the crust but results from ensialic, mantle-heat–initiated overturn of the continental crust. Nor does the attenuation of deep-crustal rocks denote extension; instead, it results from lateral migration of low-density melts in the source region of the ascending granites. As the crustal overturn is gravity driven to create isostatic equilibrium, the high-T metamorphic paths end in isobaric cooling. The mantle-derived magma may have its source in a mantle plume, impinging beneath continental crust or, in a back-arc setting, may result from slab pull-back and replacement by hot asthenosphere. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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- W2070060377 title "Mantle underplating, granite tectonics, and metamorphic P-T-t paths" @default.
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