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Redox state of earth's upper mantle from kimberlitic ilmenitesTemperatures and oxygen fugacities are reported on discrete ilmenite nodules in kimberlites from West Africa which demonstrate that the source region in the upper mantle is moderately oxidized, consistent with other nodule suites in kimberlites from southern Africa and the United States. A model is presented for a variety of tectonic settings, proposing that the upper mantle is profiled in redox potential, oxidized in the fertile asthenosphere but reduced in the depleted lithosphere.
Document ID
19830053000
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Haggerty, S. E.
(Massachusetts Univ. Amherst, MA, United States)
Tompkins, L. A.
(Massachusetts, University Amherst, MA, United States)
Date Acquired
August 11, 2013
Publication Date
May 26, 1983
Publication Information
Publication: Nature
Volume: 303
ISSN: 0028-0836
Subject Category
Geophysics
Accession Number
83A34218
Funding Number(s)
CONTRACT_GRANT: NSF EAR-78-02539
CONTRACT_GRANT: NSF EAR-78-02541
CONTRACT_GRANT: NAS5-26414
Distribution Limits
Public
Copyright
Other

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