The influence of basaltic islands on the oceanic REE distribution: A case study from the tropical South Pacific
The Rare Earth Elements (REEs) have been widely used to investigate marine biogeochemical processes as well as the sources and mixing of water masses. However, there are still important uncertainties about the global aqueous REE cycle with respect to the contributions of highly reactive basaltic min...
Published in: | Frontiers in Marine Science |
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ftoceanrep:oai:oceanrep.geomar.de:41864 2023-05-15T13:37:52+02:00 The influence of basaltic islands on the oceanic REE distribution: A case study from the tropical South Pacific Molina-Kescher, Mario Hathorne, Ed Osborne, Anne Helen Behrens, Melanie K. Kölling, Martin Pahnke, Katharina Frank, Martin 2018-02-02 text image https://oceanrep.geomar.de/id/eprint/41864/ https://oceanrep.geomar.de/id/eprint/41864/1/fmars-05-00050.pdf https://oceanrep.geomar.de/id/eprint/41864/2/Image1.JPEG https://www.frontiersin.org/articles/10.3389/fmars.2018.00050/abstract https://doi.org/10.3389/fmars.2018.00050 en eng Frontiers https://oceanrep.geomar.de/id/eprint/41864/1/fmars-05-00050.pdf https://oceanrep.geomar.de/id/eprint/41864/2/Image1.JPEG Molina-Kescher, M., Hathorne, E. , Osborne, A. H. , Behrens, M. K., Kölling, M., Pahnke, K. and Frank, M. (2018) The influence of basaltic islands on the oceanic REE distribution: A case study from the tropical South Pacific. Open Access Frontiers in Marine Science, 5 . Art.No.50. DOI 10.3389/fmars.2018.00050 <https://doi.org/10.3389/fmars.2018.00050>. doi:10.3389/fmars.2018.00050 cc_by_4.0 info:eu-repo/semantics/openAccess Article PeerReviewed 2018 ftoceanrep https://doi.org/10.3389/fmars.2018.00050 2023-04-07T15:38:09Z The Rare Earth Elements (REEs) have been widely used to investigate marine biogeochemical processes as well as the sources and mixing of water masses. However, there are still important uncertainties about the global aqueous REE cycle with respect to the contributions of highly reactive basaltic minerals originating from volcanic islands and the role of Submarine Groundwater Discharge (SGD). Here we present dissolved REE concentrations obtained from waters at the island-ocean interface (including SGD, river, lagoon and coastal waters) from the island of Tahiti and from three detailed open ocean profiles on the Manihiki Plateau (including neodymium (Nd) isotope compositions), which are located in ocean currents downstream of Tahiti. Tahitian fresh waters have highly variable REE concentrations that likely result from variable water–rock interaction and removal by secondary minerals. In contrast to studies on other islands, the SGD samples do not exhibit elevated REE concentrations but have distinctive REE distributions and Y/Ho ratios. The basaltic Tahitian rocks impart a REE pattern to the waters characterized by a middle REE enrichment, with a peak at europium similar to groundwaters and coastal waters of other volcanic islands in the Pacific. However, the basaltic island REE characteristics (with the exception of elevated Y/Ho ratios) are lost during transport to the Manihiki Plateau within surface waters that also exhibit highly radiogenic Nd isotope signatures. Our new data demonstrate that REE concentrations are enriched in Tahitian coastal water, but without multidimensional sampling, basaltic island Nd flux estimates range over orders of magnitude from relatively small to globally significant. Antarctic Intermediate Water (AAIW) loses its characteristic Nd isotopic signature (-6 to-9) around the Manihiki Plateau as a consequence of mixing with South Equatorial Pacific Intermediate Water (SEqPIW), which shows more positive values (-1 to -2). However, an additional Nd input/exchange along the pathway of ... Article in Journal/Newspaper Antarc* Antarctic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Antarctic Pacific Frontiers in Marine Science 5 |
institution |
Open Polar |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
The Rare Earth Elements (REEs) have been widely used to investigate marine biogeochemical processes as well as the sources and mixing of water masses. However, there are still important uncertainties about the global aqueous REE cycle with respect to the contributions of highly reactive basaltic minerals originating from volcanic islands and the role of Submarine Groundwater Discharge (SGD). Here we present dissolved REE concentrations obtained from waters at the island-ocean interface (including SGD, river, lagoon and coastal waters) from the island of Tahiti and from three detailed open ocean profiles on the Manihiki Plateau (including neodymium (Nd) isotope compositions), which are located in ocean currents downstream of Tahiti. Tahitian fresh waters have highly variable REE concentrations that likely result from variable water–rock interaction and removal by secondary minerals. In contrast to studies on other islands, the SGD samples do not exhibit elevated REE concentrations but have distinctive REE distributions and Y/Ho ratios. The basaltic Tahitian rocks impart a REE pattern to the waters characterized by a middle REE enrichment, with a peak at europium similar to groundwaters and coastal waters of other volcanic islands in the Pacific. However, the basaltic island REE characteristics (with the exception of elevated Y/Ho ratios) are lost during transport to the Manihiki Plateau within surface waters that also exhibit highly radiogenic Nd isotope signatures. Our new data demonstrate that REE concentrations are enriched in Tahitian coastal water, but without multidimensional sampling, basaltic island Nd flux estimates range over orders of magnitude from relatively small to globally significant. Antarctic Intermediate Water (AAIW) loses its characteristic Nd isotopic signature (-6 to-9) around the Manihiki Plateau as a consequence of mixing with South Equatorial Pacific Intermediate Water (SEqPIW), which shows more positive values (-1 to -2). However, an additional Nd input/exchange along the pathway of ... |
format |
Article in Journal/Newspaper |
author |
Molina-Kescher, Mario Hathorne, Ed Osborne, Anne Helen Behrens, Melanie K. Kölling, Martin Pahnke, Katharina Frank, Martin |
spellingShingle |
Molina-Kescher, Mario Hathorne, Ed Osborne, Anne Helen Behrens, Melanie K. Kölling, Martin Pahnke, Katharina Frank, Martin The influence of basaltic islands on the oceanic REE distribution: A case study from the tropical South Pacific |
author_facet |
Molina-Kescher, Mario Hathorne, Ed Osborne, Anne Helen Behrens, Melanie K. Kölling, Martin Pahnke, Katharina Frank, Martin |
author_sort |
Molina-Kescher, Mario |
title |
The influence of basaltic islands on the oceanic REE distribution: A case study from the tropical South Pacific |
title_short |
The influence of basaltic islands on the oceanic REE distribution: A case study from the tropical South Pacific |
title_full |
The influence of basaltic islands on the oceanic REE distribution: A case study from the tropical South Pacific |
title_fullStr |
The influence of basaltic islands on the oceanic REE distribution: A case study from the tropical South Pacific |
title_full_unstemmed |
The influence of basaltic islands on the oceanic REE distribution: A case study from the tropical South Pacific |
title_sort |
influence of basaltic islands on the oceanic ree distribution: a case study from the tropical south pacific |
publisher |
Frontiers |
publishDate |
2018 |
url |
https://oceanrep.geomar.de/id/eprint/41864/ https://oceanrep.geomar.de/id/eprint/41864/1/fmars-05-00050.pdf https://oceanrep.geomar.de/id/eprint/41864/2/Image1.JPEG https://www.frontiersin.org/articles/10.3389/fmars.2018.00050/abstract https://doi.org/10.3389/fmars.2018.00050 |
geographic |
Antarctic Pacific |
geographic_facet |
Antarctic Pacific |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
https://oceanrep.geomar.de/id/eprint/41864/1/fmars-05-00050.pdf https://oceanrep.geomar.de/id/eprint/41864/2/Image1.JPEG Molina-Kescher, M., Hathorne, E. , Osborne, A. H. , Behrens, M. K., Kölling, M., Pahnke, K. and Frank, M. (2018) The influence of basaltic islands on the oceanic REE distribution: A case study from the tropical South Pacific. Open Access Frontiers in Marine Science, 5 . Art.No.50. DOI 10.3389/fmars.2018.00050 <https://doi.org/10.3389/fmars.2018.00050>. doi:10.3389/fmars.2018.00050 |
op_rights |
cc_by_4.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.3389/fmars.2018.00050 |
container_title |
Frontiers in Marine Science |
container_volume |
5 |
_version_ |
1766098491975663616 |