Ferric Iron Content of Mineral Inclusions in Diamonds from São Luiz: A View into the Lower Mantle-Reference-Cited by-同舟云学术

Ferric Iron Content of Mineral Inclusions in Diamonds from São Luiz: A View into the Lower Mantle

Published:1997-10-17 Issue:5337 Volume:278 Page:434-436
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

McCammon Catherine¹²³,Hutchison Mark¹²³,Harris Jeff¹²³

Affiliation:

1. C. McCammon, Bayerisches Geoinstitut, Universität Bayreuth, D-95440 Bayreuth, Germany.

2. M. Hutchison, Department of Geology and Geophysics, University of Edinburgh, West Mains Road, Edinburgh EH9 3JW, UK.

3. J. Harris, Department of Geology and Applied Geology, University of Glasgow, Glasgow G12 8QQ, UK.

Abstract

Mössbauer spectroscopy on inclusions in diamonds from São Luiz, Brazil, show that (Mg,Fe)O inclusions contain little Fe 3+ (Fe 3+ /ΣFe ≤ 7%), whereas inclusions with pyroxene composition (believed to have been originally in the perovskite structure) and tetragonal almandine-pyrope phase (TAPP) inclusions contain high relative amounts of Fe 3+ (Fe 3+ /ΣFe = 20 to 75%). These observations are consistent with high-pressure experiments on synthetic samples and support the idea that the inclusions originated in the lower mantle. Fe-Mg partitioning data for co-existing (Mg,Fe,Al)(Si,Al)O 3 – (Mg,Fe)O pairs also indicate that the phases were in equilibrium at the time of diamond formation in the lower mantle.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference28 articles.

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5. M. T. Hutchison B. Harte J. W. Harris I. Fitzsimons 6th Int. Kimberlite Conf. (abstr.) (1995) p. 242.

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