Clergue, C; Dellinger, M; Buss, H L; Gaillardet, J; Dessert, C; Benedetti, M F (2017): Chemical determination of rock and vegetation materials from the Quiock Creek catchment, the volcanic part of the Guadeloupe archipelago [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.874375, Supplement to: Clergue, C et al. (2015): Influence of atmospheric deposits and secondary minerals on Li isotopes budget in a highly weathered catchment, Guadeloupe (Lesser Antilles). Chemical Geology, 414, 28-41, https://doi.org/10.1016/j.chemgeo.2015.08.015
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Abstract:
To better constrain Li dynamics in the tropics, we sampled critical zone compartments of a small forested andesitic catchment in Guadeloupe (soils, parent rock, atmospheric dust, plants, soil solutions, stream and rain waters). The aims of this study are to identify the origin of Li in the different compartments and to better characterize the behavior of Li and its isotopes during water-rock interaction in a highly cation-depleted soil. The Li isotope signature (d7Li) of throughfall samples varies between + 11.2 per mil and + 26.4 per mil. As this is lower than the seawater signature (31 per mil) and vegetation does not fractionate Li isotopes, our data indicate that Saharan dust (- 0.7 per mil) significantly contributes to the throughfall signature.
Li isotope composition measured in a 12.5 m deep soil profile varies from + 3.9 per mil near the surface to - 13.5 per mil at 11 m depth. Compared to unweathered andesite (+ 5 per mil), the deep soil signature is in agreement with preferential incorporation of light Li into secondary minerals. In the top soil however, our results also emphasized that atmospheric deposition (wet and dry) is a main source of Li to the soil. The decreasing d7Li with increasing depth is consistent with a vertical gradient of incorporation of heavy atmospheric Li, this input being maximal near the surface. At the catchment scale, throughfall and total atmospheric inputs (sea salts + Saharan dust) provide 12.1 and 23.9 g Li yr- 1 respectively to the Quiock Creek catchment. These fluxes represent 34% and 67%, respectively, of Li exported at the outlet indicating that atmospheric deposition is one of the main Li inputs to the critical zone. Li concentration and isotopic mass balance at the catchment scale indicate that in addition to atmospheric deposition, secondary mineral phase dissolution is a major solute source and that andesite no longer participates in significant production of Li.
Coverage:
Latitude: 16.207130 * Longitude: -61.670720
Date/Time Start: 2011-06-01T00:00:00 * Date/Time End: 2013-08-31T00:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
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4 datasets
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Datasets listed in this publication series
- Clergue, C; Dellinger, M; Buss, HL et al. (2017): (Table 1) Elements concentrations and Lithium isotopic compositions of the Quiock Creek catchment, the volcanic part of the Guadeloupe archipelago in the French West Indies. https://doi.org/10.1594/PANGAEA.874370
- Clergue, C; Dellinger, M; Buss, HL et al. (2017): (Table S1) Major elements and Lithium analyses of rock and vegetation standard reference materials from the Quiock Creek catchment, the volcanic part of the Guadeloupe archipelago. https://doi.org/10.1594/PANGAEA.874372
- Clergue, C; Dellinger, M; Buss, HL et al. (2017): (Table S2) Cation, anion and Lithium concentrations of throughfall, stemflow, Quiock Creek and soil solution samples from the Quiock Creek catchment, the volcanic part of the Guadeloupe archipelago. https://doi.org/10.1594/PANGAEA.874373
- Clergue, C; Dellinger, M; Buss, HL et al. (2017): (Table 2) Major elements, Lithium and Titanium concentrations and Lithium isotopic compositions of soil, andesite, dust and vegetation samples of the Quiock Creek catchment, the volcanic part of the Guadeloupe archipelago. https://doi.org/10.1594/PANGAEA.874400