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Volumn 281, Issue 5385, 1998, Pages 2011-2013

Ancient mantle in a modern arc: Osmium isotopes in Izu-Bonin-Mariana forearc peridotites

Author keywords

[No Author keywords available]

Indexed keywords

ISOTOPE; OSMIUM;

EID: 0032566533     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.281.5385.2011     Document Type: Article
Times cited : (184)

References (34)
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    • 188Os ratios supports the notion that there is negligible Re in the peridotites. Procedural blanks for Os during the course of this work varied from 16 pg to less than 2 pg. Blank corrections ranged from 0.02 to 1.5%. Re concentrations were negligible (<10 ppt) and were swamped by the Re blank.
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    • note
    • REE data from (10); the amphibole-bearing harzburgite has a smooth REE pattern increasing from La to Lu. By contrast, all the other samples have U-shaped patterns with variable light REE enrichment.
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    • 188Os ratio of the unleached and leached sample. The peridotites in this study are serpentinized but are all from deep sections of the drill core. No manganoan coating was observed on the peridotites. Moreover, it has been suggested that serpentinization of these peridotites is not by seawater alteration at a ridge crest, but by fluids from the underlying subducting plate [M. J. Mottl, Proc. ODP Sci. Res. 125, 373 (1992)].
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    • T. Meisel, R. J. Walker, J. W. Morgan, Nature 383, 517 (1996)]. Using these parameters gives slightly older (100 Ma) model ages but does not affect our conclusions.
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    • note
    • RD from the chondritic mantle.
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    • in press
    • 3 contents) means that its density is still slightly lower than that of ambient fertile mantle, even when the peridotites have cooled substantially. Therefore, it is relatively buoyant and will become stabilized (see W. L. Griffin, S. Y. O'Reilly, C. G. Ryan, O. Gaul, D. A. Ionov, AGU Spec. Monogr., in press).
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    • note
    • 3 correlate linearly during partial melting and that Re is completely extracted after ∼25% partial melting. Although modeling assumptions change the absolute values calculated, each calculation is internally consistent and the relative difference in partial melting between samples is also consistent.
  • 28
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    • note
    • 188Os ratio of 0.12757 (16). Negative γOs values indicate subchondritic Os isotope rations; positive values indicate suprachondritic ratios.
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    • note
    • We thank J. Bartlett for assistance in the laboratory. I.J.P. is funded by a Natural Environment Research Council (NERC)/ODP Fellowship, and isotope facilities at the Open University are supported by NERC.


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