Lithium Isotope Variations in Ocean Island Basalts-Implications for the Development of Mantle Heterogeneity

Krienitz, Marc-Sebastian, Garbe-Schönberg, C.-Dieter, Romer, R. L., Meixner, A., Haase, Karsten and Stroncik, N. A. (2012) Lithium Isotope Variations in Ocean Island Basalts-Implications for the Development of Mantle Heterogeneity Journal of Petrology, 53 (11). pp. 2333-2347.

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Abstract

Lithium elemental and isotopic compositions of 33 glass and whole-rock samples from nine oceanic island regions were determined to characterize the Li inventory of the deep mantle. The Li contents of the investigated lavas range from 1 center dot 5 to 13 center dot 3 mu g g(-1), whereas delta Li-7 ranges from 2 center dot 4 to 4 center dot 8 parts per thousand. There are weak co-variations between the Li/Y, delta Li-7, and Sr-Nd-Pb isotope compositions of the lavas, indicating that the Li elemental and isotopic characteristics of ocean island basalt to some extent reflect mantle source heterogeneity. In detail, HIMU-type lavas are characterized by delta Li-7 values (up to 4 center dot 8 parts per thousand) slightly heavier than those for average normal mid-ocean ridge basalt (3 center dot 4 +/- 1 center dot 4 parts per thousand) and by comparatively low Li contents; EM1-type lavas are characterized by isotopically light Li (average 3 center dot 2 parts per thousand) and relative Li enrichment, whereas EM2-type lavas tend to heavier delta Li-7 values (up to 4 center dot 4 parts per thousand) with high Li concentrations. The Li contents and isotope characteristics of HIMU-type lavas are consistent with recycling of altered and dehydrated oceanic crust, whereas those of the EM1-type lavas can be attributed to sediment recycling. The Li characteristics of EM2-type lavas may reflect reworking of mantle wedge material that has been infiltrated by fluids derived from the subducting plate.

Document Type: Article
Additional Information: Romer, RL Deutsch GeoForsch Zentrum GFZ, D-14473 Potsdam, Germany Deutsch GeoForsch Zentrum GFZ, D-14473 Potsdam, Germany Univ Kiel, Inst Geowissensch, D-24118 Kiel, Germany Deutsch Geoforschungszentrum, D-14473 Potsdam, Germany Geozentrum Nordbayern, D-91054 Erlangen, Germany
Keywords: em himu mantle reservoirs morb oib lithium international rock standards rodrigues triple junction cook-austral islands sector icp-ms li-isotope continental-crust hawaiian plume koolau volcano trace-element indian-ocean
Research affiliation: Kiel University > Kiel Marine Science
OceanRep > The Future Ocean - Cluster of Excellence
Kiel University
Refereed: Yes
ISSN: 0022-3530
Projects: Future Ocean
Date Deposited: 14 May 2014 09:53
Last Modified: 11 Apr 2018 11:57
URI: http://eprints.uni-kiel.de/id/eprint/24076

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