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Hollandite in Hawaiian basalt: a relocation site for weathering-mobilized elements

Published online by Cambridge University Press:  05 July 2018

R. V. Fodor ,
R. S. Jacobs  and
G. R. Bauer
R. V. Fodor
Affiliation:
Department of Marine, Earth, and Atmospheric Sciences, North Carolina State University, Raleigh, NC 27695 USA
R. S. Jacobs
Affiliation:
Department of Marine, Earth, and Atmospheric Sciences, North Carolina State University, Raleigh, NC 27695 USA
G. R. Bauer
Affiliation:
Department of Land and Natural Resources, Honolulu, HI 96813, USA
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Abstract

Enrichments in Ba, REE and Y abundances, occurrences of REE, Y-bearing phosphate, depletions in K and Rb, and negative Ce anomalies in some lavas on Kahoolawe (Hawaii) reflect secondary mobilization of Ba, REE, Y, K and Rb. Hollandite (Ba-Mn-oxide) in the groundmass of a Kahoolawe lava contains nearly 10 wt.% BaO, ∼ 1.1 wt.% CeO2, and small amounts of La, Nd, Y, K, Na, P, Cl and Cu to provide an example of where elements mobilized during weathering processes on the Hawaiian Islands find residence. Fe-vernadite, a second Mn-oxide, also hosts mobilized REE and Ba. A positive Ce anomaly in the hollandite complements the negative Ce anomaly in some Kahoolawe lavas, this is analogous to Ce accumulation in todorokite of manganese nodules complementing Ce-depleted seawater. Mn-oxides, then, can serve as links between lavas depleted and enriched in certain elements.

Keywords

hollanditeferruginous vernaditetrace-element mobilizationCe anomalyHawaiian basalt
Type
Mineralogy
Information
Mineralogical Magazine , Volume 58 , Issue 393 , December 1994 , pp. 589 - 596
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1994

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Footnotes

*

Present Address: Bass Enterprises Production, Ft. Worth, TX 76102, USA.

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