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Garnet in the Earth's mantle

Bernard J. Wood, Ekaterina S. Kiseeva and Andrew K. Matzen
Garnet in the Earth's mantle (in Garnet; common mineral, uncommonly useful, Ethan F. Baxter (editor), Mark J. Caddick (editor) and Jay J. Ague (editor))
Elements (December 2013) 9 (6): 421-426


Aluminous garnet, (Mg,Fe (super 2+) ,Ca) (sub 3) (Al,Cr) (sub 2) Si (sub 3) O (sub 12) , is an important constituent of mantle peridotite ( approximately 10%) and of the other abundant upper mantle rock, eclogite ( approximately 50%). Its unusual crystal chemistry means that it strongly prefers some trace elements and confers a "garnet signature" on mantle melts. As depth increases from 250 to 600 km, garnet increases in abundance in mantle rocks, dissolving large fractions of the other silicates and becoming Si rich (majoritic). These compositional changes are observed in some garnets found as inclusions in diamond. Garnet disappears from mantle assemblages at about 700 km depth, where it is replaced by an even denser silicate, perovskite.

ISSN: 1811-5209
Serial Title: Elements
Serial Volume: 9
Serial Issue: 6
Title: Garnet in the Earth's mantle
Title: Garnet; common mineral, uncommonly useful
Author(s): Wood, Bernard J.Kiseeva, Ekaterina S.Matzen, Andrew K.
Author(s): Baxter, Ethan F.editor
Author(s): Caddick, Mark J.editor
Author(s): Ague, Jay J.editor
Affiliation: University of Oxford, Department of Earth Sciences, Oxford, United Kingdom
Affiliation: Boston University, Department of Earth and Environment, Boston, MA, United States
Pages: 421-426
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: 32
Accession Number: 2014-004608
Categories: Geophysics of minerals and rocks
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Secondary Affiliation: Virginia Tech, USA, United StatesYale University, 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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