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|Web of Science®
|The influence of volcanic ash alteration on the REE composition of marine pore waters
|Journal of Geochemical Exploration, 2010; 106(1-3 Sp Iss):176-187
|Elsevier Science BV
|Ulrike Schacht, Klaus Wallmann and Steffen Kutterolf
|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 0.04nmolLacm-2yr-1 and 0.09nmolCecm-2yr-1. © 2010 Elsevier B.V.
|© 2010 Elsevier B.V.
|Appears in Collections:
Australian School of Petroleum publications
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