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Metamorphism as garnet sees it; the kinetics of nucleation and growth, equilibration, and diffusional relaxation

Jay J. Ague and William D. Carlson
Metamorphism as garnet sees it; the kinetics of nucleation and growth, equilibration, and diffusional relaxation (in Garnet; common mineral, uncommonly useful, Ethan F. Baxter (editor), Mark J. Caddick (editor) and Jay J. Ague (editor))
Elements (December 2013) 9 (6): 439-445

Abstract

Garnet bears witness to the importance of kinetics during metamorphism in its microstructural features, compositional zoning, and diffusional response to thermal events. Porphyroblastic textures carry quantitative signals of protracted nucleation and sluggish intergranular diffusion, key impediments to reaction progress that may result in crystallization under conditions well removed from equilibrium. Growth zoning in garnet reveals partial chemical equilibration with matrix minerals: intergranular transport keeps pace with garnet growth for some elements but not for others, leading to variable degrees and length scales of chemical equilibration. Partial relaxation of compositional zoning by intracrystalline diffusion is a sensitive and quantitative indicator of thermal history, constraining rates and timescales of peak metamorphic heating, processes of burial and exhumation, and retrogression on cooling.


ISSN: 1811-5209
Serial Title: Elements
Serial Volume: 9
Serial Issue: 6
Title: Metamorphism as garnet sees it; the kinetics of nucleation and growth, equilibration, and diffusional relaxation
Title: Garnet; common mineral, uncommonly useful
Author(s): Ague, Jay J.Carlson, William D.
Author(s): Baxter, Ethan F.editor
Author(s): Caddick, Mark J.editor
Author(s): Ague, Jay J.editor
Affiliation: Yale University, Department of Geology and Geophysics, New Haven, CT, United States
Affiliation: Boston University, Department of Earth and Environment, Boston, MA, United States
Pages: 439-445
Published: 201312
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: 38
Accession Number: 2014-004611
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Secondary Affiliation: Virginia Tech, USA, United StatesYale University, USA, United StatesUniversity of Texas at Austin, 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: 201404
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