The influence of volcanic ash alteration on the REE composition of marine pore waters

Schacht, Ulrike, Wallmann, Klaus and Kutterolf, Steffen (2010) The influence of volcanic ash alteration on the REE composition of marine pore waters Journal of Geochemical Exploration, 106 (1-3). pp. 176-187. DOI 10.1016/j.gexplo.2010.02.006.

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Two volcanic ash layer dominated marine gravity cores were recovered during research cruise RV Sonne 173/3 along the Pacific margin offshore Nicaragua. Thick ash layers dominate the recovered sediments. Pore water samples of these – one incoming plate and one slope site – sediment cores have been analysed for light rare earth elements, alkalinity, sulphate, phosphate, ammonia, calcium, and manganese contents.
The data provide a systematic look at changes in REE during diagenesis proceeding from open ocean sediments to highly reducing near-shore sediments. The pore water patterns of all the dissolved species mentioned above suggest that volcanic glass alteration constitutes a major source for REE release in marine sediments when low rates of anaerobic degradation of organic matter, like typical for incoming plate/open ocean sediments, prevail. Under these conditions the release of REE results in fluxes of at least 0.04 nmol La cm− 2 yr− 1 and 0.09 nmol Ce cm− 2 yr− 1.

Document Type: Article
Keywords: Volcanology; Rare earth elements; Marine pore waters; Ash alteration
Research affiliation: OceanRep > SFB 574 > C4
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
OceanRep > SFB 574
OceanRep > SFB 574 > B5
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS Magmatic and Hydrothermal Systems
Refereed: Yes
DOI etc.: 10.1016/j.gexplo.2010.02.006
ISSN: 0375-6742
Contribution Number:
SFB 574125
Date Deposited: 12 Jul 2010 12:55
Last Modified: 12 Jul 2017 09:02

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