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Partitioning behaviour of Hf and Zr between amphibole, clinopyroxene, garnet and silicate melts at high pressure

Akihiko Fujinawa and Trevor H. Green
Partitioning behaviour of Hf and Zr between amphibole, clinopyroxene, garnet and silicate melts at high pressure (in EMPG-VI; Experimental mineralogy, petrology and geochemistry, E. A. J. Burke (editor), C. Chopin (editor), W. V. Maresch (editor), L. Ungaretti (editor) and C. Willaime (editor))
European Journal of Mineralogy (April 1997) 9 (2): 379-391

Abstract

Partition coefficients (D) have been determined for Hf and Zr for amphibole, clinopyroxene and garnet crystallizing from Zr- and Hf-enriched basanite and andesite compositions at 0.5-3.0 GPa and 1000-1050 degrees C (basanite) or 900-950 degrees C (andesite). D (sub Hf) and D (sub Zr) for amphibole and clinopyroxene decrease with increasing P, and D (sub Hf) is consistently >><$I> D (sub Zr) ; for garnet, however, D (sub Zr) >><$I> D (sub Hf) . The effect of P is most noteworthy between 0.5 and 1.5 GPa ( approximately a threefold decrease from 0.61 to 0.20 in D (sub Hf) for amphibole). This should be taken into account when modelling the behaviour of Zr and Hf in magmas, especially at crustal depths. The partitioning results for Hf are linked with established patterns for REE in clinopyroxene and garnet crystallizing from a similar basanite, and confirm that the depth of initiation of melting for oceanic basalts may be shallower than originally believed. The near-chondritic constancy of Sm/Hf in mantle derived melts cannot be attributed to a combined role of residual garnet and clinopuyroxene.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 9
Serial Issue: 2
Title: Partitioning behaviour of Hf and Zr between amphibole, clinopyroxene, garnet and silicate melts at high pressure
Title: EMPG-VI; Experimental mineralogy, petrology and geochemistry
Author(s): Fujinawa, AkihikoGreen, Trevor H.
Author(s): Burke, E. A. J.editor
Author(s): Chopin, C.editor
Author(s): Maresch, W. V.editor
Author(s): Ungaretti, L.editor
Author(s): Willaime, C.editor
Affiliation: Ibaraki University, Department of Earth Sciences, Mito, Japan
Pages: 379-391
Published: 199704
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
Meeting name: Sixth international symposium on Experimental mineralogy, petrology and geochemistry
Meeting location: Bayreuth, DEU, Federal Republic of Germany
Meeting date: 19960410April 10-13, 1996
References: 47
Accession Number: 1997-036951
Categories: Mineralogy of silicates
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: 2 tables
Secondary Affiliation: Macquarie University, AUS, Australia
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199712
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