GEOCHEMICAL JOURNAL
Online ISSN : 1880-5973
Print ISSN : 0016-7002
ISSN-L : 0016-7002
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Uptake of porewater phosphate by REY-rich mud in the western North Pacific Ocean
Akira IjiriKei OkamuraJunichiro OhtaYoshiro NishioYohei HamadaKoichi IijimaFumio Inagaki
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2018 Volume 52 Issue 4 Pages 373-378

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Abstract

Deep-sea mud extremely enriched in rare-earth elements and yttrium (together called REY) has been discovered around Minamitorishima Island, in the western North Pacific. The REY-rich mud was previously observed to contain abundant phillipsite and biogenic calcium phosphate. We analyzed the chemical compositions of porewater in a sediment core containing REY-rich mud and observed a decrease of dissolved phosphate (PO43–) from ~1 μM to ~0.5 μM around the REY-rich mud layer. The presence of dissolved nitrate + nitrite throughout the cored depth indicated oxic sediment conditions. In the REY-rich mud, PO43– was presumed to be adsorbed onto the surfaces of minerals such as phillipsite. Our results support that oxic pelagic clay containing phillipsite can be a sink for PO43–. Concentrations of REY in porewater were below the detection limit.

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© 2018 by The Geochemical Society of Japan
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