Articles | Volume 21, issue 1
https://doi.org/10.5194/bg-21-145-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-21-145-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
09 Jan 2024
Research article |
| 09 Jan 2024
| 09 Jan 2024
A step towards measuring connectivity in the deep sea: elemental fingerprints of mollusk larval shells discriminate hydrothermal vent sites
Sorbonne Université, CNRS, Adaptation et Diversité en Milieu Marin, AD2M, Station Biologique de Roscoff, 29680, Roscoff, France
Christophe Pecheyran
Universite de Pau et des Pays de l'Adour, E2S UPPA, CNRS, IPREM, Avenue de l'Université, BP 576 64012, Pau CEDEX, France
Fanny Claverie
Universite de Pau et des Pays de l'Adour, E2S UPPA, CNRS, IPREM, Avenue de l'Université, BP 576 64012, Pau CEDEX, France
Cécile Cathalot
Geo-Ocean, Univ. Brest, CNRS, IFREMER, UMR6539, 29280, Plouzané, France
Marjolaine Matabos
IFREMER REM-EEP, Technopôle Brest Plouzané, 29280, Plouzané, France
Yoan Germain
Geo-Ocean, Univ. Brest, CNRS, IFREMER, UMR6539, 29280, Plouzané, France
Olivier Rouxel
Geo-Ocean, Univ. Brest, CNRS, IFREMER, UMR6539, 29280, Plouzané, France
Didier Jollivet
Sorbonne Université, CNRS, Adaptation et Diversité en Milieu Marin, AD2M, Station Biologique de Roscoff, 29680, Roscoff, France
Thomas Broquet
Sorbonne Université, CNRS, Adaptation et Diversité en Milieu Marin, AD2M, Station Biologique de Roscoff, 29680, Roscoff, France
Thierry Comtet
Sorbonne Université, CNRS, Adaptation et Diversité en Milieu Marin, AD2M, Station Biologique de Roscoff, 29680, Roscoff, France
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While the southern Mozambique Channel receives a range of atmospheric influences from Madagascar and southeastern Africa, no study has investigated the composition of such air-masses. We characterise the trace element composition of aerosols over the Channel when natural emissions are low. Results show critical levels of potentially toxic elements, chromium and cadmium, which were linked to emissions from mining (chromite and gold) and smelting activities on both neighbouring landmasses.
Guilhem Hoareau, Fanny Claverie, Christophe Pecheyran, Gaëlle Barbotin, Michael Perk, Nicolas E. Beaudoin, Brice Lacroix, and E. Troy Rasbury
Geochronology, 7, 387–407, https://doi.org/10.5194/gchron-7-387-2025, https://doi.org/10.5194/gchron-7-387-2025, 2025
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We present an approach to dating of carbonates using isotopic maps. The maps are divided into squares called virtual spots. For each virtual spot, statistical values (mean, uncertainty) are used to determine the age. The user can modify the size and location of the virtual spots and select those that give the most robust age. This approach, applied to high-spatial-resolution images, makes it possible for the first time to obtain satisfactory ages on maps as small as 100 µm x 100 µm.
Pedro J. Soto Vega, Gustavo X. Andrade-Miranda, Gilson A. O. P. da Costa, Panagiotis Papadakis, Marjolaine Matabos, Thibault Napoleon, Ayoub Karine, and Henrique Fagundes Gasparoto
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Geochronology, 6, 247–263, https://doi.org/10.5194/gchron-6-247-2024, https://doi.org/10.5194/gchron-6-247-2024, 2024
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Carbonate wall deposits of Trou du Renard cave (France) were dated using a multimethod approach: U–Th dating by bulk dissolution of samples and inductively coupled plasma mass spectrometry (ICP-MS), U–Th dating by laser ablation ICP-MS imaging, and radiocarbon dating. The samples were studied to ensure that they give reliable ages. Ages ranging from 187.9 ± 5.3 ka and 1.4 ± 0.1 ka were found. This approach should make it possible to establish more robust chronologies of archaeological caves.
Valentin Siebert, Brivaëla Moriceau, Lukas Fröhlich, Bernd R. Schöne, Erwan Amice, Beatriz Beker, Kevin Bihannic, Isabelle Bihannic, Gaspard Delebecq, Jérémy Devesa, Morgane Gallinari, Yoan Germain, Émilie Grossteffan, Klaus Peter Jochum, Thierry Le Bec, Manon Le Goff, Céline Liorzou, Aude Leynaert, Claudie Marec, Marc Picheral, Peggy Rimmelin-Maury, Marie-Laure Rouget, Matthieu Waeles, and Julien Thébault
Earth Syst. Sci. Data, 15, 3263–3281, https://doi.org/10.5194/essd-15-3263-2023, https://doi.org/10.5194/essd-15-3263-2023, 2023
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This article presents an overview of the results of biological, chemical and physical parameters measured at high temporal resolution (sampling once and twice per week) during environmental monitoring that took place in 2021 in the Bay of Brest. We strongly believe that this dataset could be very useful for other scientists performing sclerochronological investigations, studying biogeochemical cycles or conducting various ecological research projects.
Olivier Lacombe, Nicolas E. Beaudoin, Guilhem Hoareau, Aurélie Labeur, Christophe Pecheyran, and Jean-Paul Callot
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This paper aims to illustrate how the timing and duration of contractional deformation associated with folding in orogenic forelands can be constrained by the dating of brittle mesostructures observed in folded strata. The study combines new and already published absolute ages of fractures to provide, for the first time, an educated discussion about the factors controlling the duration of the sequence of deformation encompassing layer-parallel shortening, fold growth, and late fold tightening.
Paul J. Tréguer, Jill N. Sutton, Mark Brzezinski, Matthew A. Charette, Timothy Devries, Stephanie Dutkiewicz, Claudia Ehlert, Jon Hawkings, Aude Leynaert, Su Mei Liu, Natalia Llopis Monferrer, María López-Acosta, Manuel Maldonado, Shaily Rahman, Lihua Ran, and Olivier Rouxel
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Silicon is the second most abundant element of the Earth's crust. In this review, we show that silicon inputs and outputs, to and from the world ocean, are 57 % and 37 % higher, respectively, than previous estimates. These changes are significant, modifying factors such as the geochemical residence time of silicon, which is now about 8000 years and 2 times faster than previously assumed. We also update the total biogenic silica pelagic production and provide an estimate for sponge production.
Guilhem Hoareau, Fanny Claverie, Christophe Pecheyran, Christian Paroissin, Pierre-Alexandre Grignard, Geoffrey Motte, Olivier Chailan, and Jean-Pierre Girard
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A new methodology for the micron-scale uranium–lead dating of carbonate minerals is proposed. It is based on the extraction of ages directly from pixel images (< 1 mm2) obtained by laser ablation coupled to a mass spectrometer. The ages are calculated with a robust linear regression through the pixel values. This methodology is compared to existing approaches.
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Short summary
The impact of deep-sea mining will depend critically on the ability of larval dispersal of hydrothermal mollusks to connect and replenish natural populations. However, assessing connectivity is extremely challenging, especially in the deep sea. Here, we investigate the potential of using the chemical composition of larval shells to discriminate larval origins between multiple hydrothermal sites in the southwest Pacific. Our results confirm that this method can be applied with high accuracy.
The impact of deep-sea mining will depend critically on the ability of larval dispersal of...
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