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

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

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. W...

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Bibliographic Details
Main Authors: Valk, O., Rutgers van der Loeff, M. M., Geibert, W., Gdaniec, S., Rijkenberg, M. J. A., Moran, S. B., Lepore, K., Edwards, R. L., Puigcorbé, V., Lu, Yanbin
Other Authors: Earth Observatory of Singapore
Format: Article
Language:English
Published: 2019
Subjects:
Hydrothermal Scavenging
DRNTU::Social sciences::Geography
Nansen Basin
Online Access:https://hdl.handle.net/10356/103505
http://hdl.handle.net/10220/47339
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Institution: Nanyang Technological University
Language: English
Description
Summary: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.

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