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Science 28 November 1997:
Vol. 278. no. 5343, pp. 1595 - 1598
DOI: 10.1126/science.278.5343.1595
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Reports

Platinum-Group Element Abundance Patterns in Different Mantle Environments

Mark Rehkämper, * Alex N. Halliday, Dan Barfod, J. Godfrey Fitton, J. Barry Dawson

Mantle-derived xenoliths from the Cameroon Line and northern Tanzania display differences in their platinum-group element (PGE) abundance patterns. The Cameroon Line lherzolites have uniform PGE patterns indicating a homogeneous upper mantle over several hundreds of kilometers, with approximately chondritic PGE ratios. The PGE patterns of the Tanzanian peridotites are similar to the PGE systematics of ultramafic rocks from ophiolites. The differences can be explained if the northern Tanzanian lithosphere developed in a fluid-rich suprasubduction zone environment, whereas the Cameroon Line lithosphere only experienced melt extraction from anhydrous peridotites.

M. Rehkämper, A. N. Halliday, D. Barfod, Department of Geological Sciences, University of Michigan, Ann Arbor, MI 48109-1063, USA.
J. G. Fitton and J. B. Dawson, Department of Geology and Geophysics, University of Edinburgh, Edinburgh EH9 3JW, UK.
*   To whom correspondence should be addressed. E-mail: markrehk{at}umich.edu

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Platinum-group elements in peridotite xenoliths and kimberlite from the Premier kimberlite pipe, South Africa.
W.D. Maier, P. Peltonen, R. Juvonen, and C. Pienaar (2005)
South African Journal of Geology 108, 413-428
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Large igneous province magma petrogenesis from source to surface: platinum-group element evidence from Ontong Java Plateau basalts recovered during ODP Legs 130 and 192.
W. J. Chazey III and C. R. Neal (2004)
Geological Society, London, Special Publications 229, 219-238
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Metasomatism and Partial Melting in Upper-Mantle Peridotite Xenoliths from the Lashaine Volcano, Northern Tanzania.
J. B. DAWSON (2002)
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A Platinum Group Element and Re-Os Isotope Investigation of Siderophile Element Recycling in Subduction Zones: Comparison of Grenada, Lesser Antilles Arc, and the Izu-Bonin Arc.
S. J. WOODLAND, D. G. PEARSON, and M. F. THIRLWALL (2002)
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Plume-Lithosphere Interactions in the Generation of the Basalts of the Kenya Rift, East Africa.
R. MACDONALD, N. W. ROGERS, J. G. FITTON, S. BLACK, and M. SMITH (2001)
J. Petrology 42, 877-900
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Coupled 186Os and 187Os Evidence for Core-Mantle Interaction.
A. D. Brandon, R. J. Walker, J. W. Morgan, M. D. Norman, and H. M. Prichard (1998)
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Science. ISSN 0036-8075 (print), 1095-9203 (online)