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Implications of post-thrusting extension and underplating for P-T-t paths in granulite terranes:A Grenville example
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1990
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EngineeringGeomorphologyTectonic EvolutionGrenville ExampleEarth ScienceRegional GeologyGeophysicsGeological DataGranulite TerranesRegional TectonicsGeochronologyGeodesyNeotectonicsGeographyGeologyEngineering GeologySignificant Path DispersionTectonicsPost-thrusting ExtensionStructural GeologyQuaternary Tectonic DeformationGeomechanicsExploration GeologyEarth SciencesOrogeny
Research Article| May 01, 1990 Implications of post-thrusting extension and underplating for P-T-t paths in granulite terranes:A Grenville example L. M. Anovitz; L. M. Anovitz 1Department of Geosciences, University of Arizona, Tucson, Arizona 85721 Search for other works by this author on: GSW Google Scholar C. G. Chase C. G. Chase 1Department of Geosciences, University of Arizona, Tucson, Arizona 85721 Search for other works by this author on: GSW Google Scholar Author and Article Information L. M. Anovitz 1Department of Geosciences, University of Arizona, Tucson, Arizona 85721 C. G. Chase 1Department of Geosciences, University of Arizona, Tucson, Arizona 85721 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1990) 18 (5): 466–469. https://doi.org/10.1130/0091-7613(1990)018<0466:IOPTEA>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation L. M. Anovitz, C. G. Chase; Implications of post-thrusting extension and underplating for P-T-t paths in granulite terranes:A Grenville example. Geology 1990;; 18 (5): 466–469. doi: https://doi.org/10.1130/0091-7613(1990)018<0466:IOPTEA>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 Mineral zoning studies in several granulite terranes have yielded nearly isobaric retrograde pressure-temperature (P-T) paths with significant path dispersion. Explanations include magmatic underplating, incomplete isostatic rebound following thrusting, and cooling after tectonic denudation associated with crustal extension. One-dimensional thermal models help to interpret the P-T-t (time) paths generated by such processes. Basaltic underplating yields P-T paths in good agreement with data for the Grenville province of Ontario, but yields T-t paths that disagree strongly with thermochronometry. In addition, seismic, heat-flow, and gravity data from the Grenville province are not consistent with a mafic lower crust. Calculations based on simple thrust models agree with the T-t data, but yield isothermal rather than isobaric initial P-T paths, and consistently underestimate the pressure at which peak temperature is achieved. The only model we found that fits both the P-T and T-t data incorporates a post-thrusting episode of tectonic denudation near the peak of metamorphism. This model also suggests that the temperature dependence of diffusion in garnet may explain the difference between measured isobaric and isothermal paths in granulites and amphibolites. 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.