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Linking time to the pressure-temperature path for ultrahigh-pressure rocks

William C. McClelland and Thomas J. Lapen
Linking time to the pressure-temperature path for ultrahigh-pressure rocks (in Continental crust at mantle depths, Jane A. Gilotti (editor))
Elements (August 2013) 9 (4): 273-279

Abstract

Establishing the timing and duration of ultrahigh-pressure metamorphism (UHP) for crustal rocks subducted to mantle depths of over 100 km requires high-precision geochronology directly coupled with pressure-sensitive indicators. The best links between UHP conditions and an age estimate are inclusions of the UHP indicator minerals coesite and/or diamond in datable zircon or garnet. Lu-Hf and Sm-Nd garnet ages define the prograde and peak portions of the pressure-temperature path for cold (<700 degrees C), fast (>1 cm/y) UHP systems. UHP metamorphism in hotter (>800 degrees C) and slower (<1 cm/y) terranes is best dated by U-Pb analysis of coesite-bearing zircon domains coupled with Sm-Nd and Lu-Hf garnet analysis.


ISSN: 1811-5209
Serial Title: Elements
Serial Volume: 9
Serial Issue: 4
Title: Linking time to the pressure-temperature path for ultrahigh-pressure rocks
Title: Continental crust at mantle depths
Author(s): McClelland, William C.Lapen, Thomas J.
Author(s): Gilotti, Jane A.editor
Affiliation: University of Iowa, Department of Earth and Environmental Sciences, Iowa City, IA, United States
Affiliation: University of Iowa, Department of Earth and Environmental Sciences, Iowa City, IA, United States
Pages: 273-279
Published: 201308
Text Language: English
Publisher: Mineralogical Society of America and Mineralogical Society of Great Britain and Ireland and Mineralogical Association of Canada and Geochemical Society and Clay Minerals Society, International
References: 30
Accession Number: 2013-080217
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Secondary Affiliation: University of Houston, USA, United States
Country of Publication: International
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201347
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