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Pb isotopic variability in melt inclusions from the EMI–EMII–HIMU mantle end-members and the role of the oceanic lithosphere

Saal, A. E. and Hart, S. R. and Shimizu, N. and Hauri, E. H. and Layne, G. D. and Eiler, J. M. (2005) Pb isotopic variability in melt inclusions from the EMI–EMII–HIMU mantle end-members and the role of the oceanic lithosphere. Earth and Planetary Science Letters, 240 (3-4). pp. 605-620. ISSN 0012-821X. http://resolver.caltech.edu/CaltechAUTHORS:20121030-090706151

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Abstract

Melt inclusions from four individual lava samples representing the HIMU (Mangaia Island), EMI (Pitcairn Island) and EMII (Tahaa Island) end member components, have heterogeneous Pb isotopic composition larger than that defined by the erupted lavas in each island. The broad linear trend in ^(207)Pb/^(206)Pb–^(208)Pb/^(206)Pb space produced by the melt inclusions from Mangaia, Tahaa and fPitcairn samples reproduces the entire trend defined by the Austral chain, the Society islands and the Pitcairn island and seamount groups. The inclusions preserve a record of melt composition of far greater isotopic diversity than that sampled in whole rock basalts. These results can be explained by mixing of a common depleted component with the HIMU, EMI and EMII lavas, respectively. We favor a model that considers the oceanic lithosphere to be that common component. We suggest that the Pb isotopic compositions of the melt inclusions reflect wall rock reaction of HIMU, EMI and EMII melts during their percolation through the oceanic lithosphere. Under these conditions, the localized rapid crystallization of olivine from primitive basalt near the reaction zone would allow the entrapment of melt inclusions with different isotopic composition.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/j.epsl.2005.10.002DOIUNSPECIFIED
http://www.sciencedirect.com/science/article/pii/S0012821X05006813PublisherUNSPECIFIED
Additional Information:© 2005 Elsevier B.V. Received 24 April 2005; received in revised form 1 October 2005; accepted 4 October 2005. Available online 10 November 2005. Editor: K. Farley. We are grateful to M. O. Garcia for the Loihi sample that we used as standards during this work, to K. Farley and H. Craig for providing the Pitcairn sample, and to E. Drenkard for the reading the manuscript. Thorough and constructive reviews by R. Nielsen and I. VlastÈlic are also greatly appreciated. All the authors are deeply grateful for the support received from NSF.
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Subject Keywords:melt inclusions; Pb isotopes; oceanic island basalts
Record Number:CaltechAUTHORS:20121030-090706151
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20121030-090706151
Official Citation:A.E. Saal, S.R. Hart, N. Shimizu, E.H. Hauri, G.D. Layne, J.M. Eiler, Pb isotopic variability in melt inclusions from the EMI–EMII–HIMU mantle end-members and the role of the oceanic lithosphere, Earth and Planetary Science Letters, Volume 240, Issues 3–4, 15 December 2005, Pages 605-620, ISSN 0012-821X, 10.1016/j.epsl.2005.10.002. (http://www.sciencedirect.com/science/article/pii/S0012821X05006813)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:35168
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:30 Oct 2012 16:36
Last Modified:27 Dec 2012 02:56

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