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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...
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ftfrontimediafig:oai:figshare.com:article/5943634 2023-05-15T13:59:35+02:00 Image2.JPEG Mario Molina-Kescher Ed C. Hathorne Anne H. Osborne Melanie K. Behrens Martin Kölling Katharina Pahnke Martin Frank 2018-03-02T14:14:15Z https://doi.org/10.3389/fmars.2018.00050.s002 https://figshare.com/articles/Image2_JPEG/5943634 unknown doi:10.3389/fmars.2018.00050.s002 https://figshare.com/articles/Image2_JPEG/5943634 CC BY 4.0 CC-BY Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering Rare Earth Elements Nd isotope compositions Tahiti tropical South Pacific Submarine Groundwater Discharge (SGD) Antarctic Intermediate Water (AAIW) Image Figure 2018 ftfrontimediafig https://doi.org/10.3389/fmars.2018.00050.s002 2018-03-06T15:38:53Z 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 ... Still Image Antarc* Antarctic Frontiers: Figshare Antarctic Pacific |
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Open Polar |
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Frontiers: Figshare |
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ftfrontimediafig |
language |
unknown |
topic |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering Rare Earth Elements Nd isotope compositions Tahiti tropical South Pacific Submarine Groundwater Discharge (SGD) Antarctic Intermediate Water (AAIW) |
spellingShingle |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering Rare Earth Elements Nd isotope compositions Tahiti tropical South Pacific Submarine Groundwater Discharge (SGD) Antarctic Intermediate Water (AAIW) Mario Molina-Kescher Ed C. Hathorne Anne H. Osborne Melanie K. Behrens Martin Kölling Katharina Pahnke Martin Frank Image2.JPEG |
topic_facet |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering Rare Earth Elements Nd isotope compositions Tahiti tropical South Pacific Submarine Groundwater Discharge (SGD) Antarctic Intermediate Water (AAIW) |
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 |
Still Image |
author |
Mario Molina-Kescher Ed C. Hathorne Anne H. Osborne Melanie K. Behrens Martin Kölling Katharina Pahnke Martin Frank |
author_facet |
Mario Molina-Kescher Ed C. Hathorne Anne H. Osborne Melanie K. Behrens Martin Kölling Katharina Pahnke Martin Frank |
author_sort |
Mario Molina-Kescher |
title |
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title_full_unstemmed |
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publishDate |
2018 |
url |
https://doi.org/10.3389/fmars.2018.00050.s002 https://figshare.com/articles/Image2_JPEG/5943634 |
geographic |
Antarctic Pacific |
geographic_facet |
Antarctic Pacific |
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Antarc* Antarctic |
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Antarc* Antarctic |
op_relation |
doi:10.3389/fmars.2018.00050.s002 https://figshare.com/articles/Image2_JPEG/5943634 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3389/fmars.2018.00050.s002 |
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1766268191599755264 |