Importance of hydrothermal vents in scavenging removal of 230Th in the Nansen Basin

Authors

O. Valk
M. M. Rutgers van der Loeff
W. Geibert
S. Gdaniec
M. J.A. Rijkenberg
S. B. Moran
K. Lepore
R. L. Edwards
Y. Lu
Viena Puigcorbe, Edith Cowan UniversityFollow

Document Type

Journal Article

Publication Title

Geophyiscal Research Letters

Publisher

John Wiley and Sons, Inc

School

School of Science

RAS ID

27375

Comments

Valk, O., Rutgers van der Loeff, M. M., Geibert, W., Gdaniec, S., Rijkenberg, M. J., Moran, S. B., ... & Puigcorbé, V. (2018). Importance of hydrothermal vents in scavenging removal of 230Th in the Nansen Basin. Geophysical Research Letters, 45(19).10,539-10,548.

Available here.

Abstract

In this study we present dissolved and particulate ²³⁰Th and ²³²Th results, as well as particulate ²³⁴Th data, obtained as part of the GEOTRACES central Arctic Ocean sections GN04 (2015) and IPY11 (2007). Samples were analyzed following GEOTRACES methods and compared to previous results from 1991. We observe significant decreases in ²³⁰Th concentrations in the deep waters of the Nansen Basin. We ascribe this nonsteady state removal process to a variable release and scavenging of trace metals near an ultraslow spreading ridge. This finding demonstrates that hydrothermal scavenging in the deep‐sea may vary on annual time scales and highlights the importance of repeated GEOTRACES sections.

DOI

10.1029/2018GL079829

Creative Commons License

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