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  • Barite saturation state  (1)
  • Calcite  (1)
  • 1
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    Reproducibility of Ba/Ca variations recorded by northeast Pacific bamboo corals (2017)
    John Wiley & Sons
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © American Geophysical Union, 2017. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography 32 (2017): 966–979, doi:10.1002/2017PA003178.
    Description: Trace elemental ratios preserved in the calcitic skeleton of bamboo corals have been shown to serve as archives of past ocean conditions. The concentration of dissolved barium (BaSW), a bioactive nutrientlike element, is linked to biogeochemical processes such as the cycling and export of nutrients. Recent work has calibrated bamboo coral Ba/Ca, a new BaSW proxy, using corals spanning the oxygen minimum zone beneath the California Current System. However, it was previously unclear whether Ba/Cacoral records were internally reproducible. Here we investigate the accuracy of using laser ablation inductively coupled plasma mass spectrometry for Ba/Cacoral analyses and test the internal reproducibility of Ba/Ca among replicate radial transects in the calcite of nine bamboo corals collected from the Gulf of Alaska (643–720 m) and the California margin (870–2054 m). Data from replicate Ba/Ca transects were aligned using visible growth bands to account for nonconcentric growth; smoothed data were reproducible within ~4% for eight corals (n = 3 radii/coral). This intracoral reproducibility further validates using bamboo coral Ba/Ca for BaSW reconstructions. Sections of the Ba/Ca records that were potentially influenced by noncarbonate bound Ba phases occurred in regions where elevated Mg/Ca or Pb/Ca and coincided with anomalous regions on photomicrographs. After removing these regions of the records, increased Ba/Cacoral variability was evident in corals between ~800 and 1500 m. These findings support additional proxy validation to understand BaSW variability on interannual timescales, which could lead to new insights into deep sea biogeochemistry over the past several centuries.
    Description: NSF Grant Number: OCE-1420984; NOAA/OE Grant Number: NA16RP2637; MIT-WHOI Joint Program; American Geophysical Union Travel Grant; UC Davis President's Undergraduate Fellowship; Bowdoin College Gibbons Summer Research Fellowship
    Description: 2018-03-13
    Keywords: LA-ICP-MS ; Ba/Ca ; Proxy development ; Calcite ; Deep-sea coral ; Skeletal geochemistry
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 2
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    Barite precipitation on suspended organic matter in the mesopelagic zone (2020)
    Frontiers Media
    Details
    Publication Date: 2022-10-26
    Description: © The Author(s), 2020. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Martinez-Ruiz, F., Paytan, A., Gonzalez-Munoz, M. T., Jroundi, F., Abad, M. M., Lam, P. J., Horner, T. J., & Kastner, M. Barite precipitation on suspended organic matter in the mesopelagic zone. Frontiers in Earth Science, 8, (2020): 567714, doi:10.3389/feart.2020.567714.
    Description: Mechanisms underlying barite precipitation in seawater and the precise depths of barite precipitation in the water column have been debated for decades. Here we present a detailed study of water column barite distribution in the mesopelagic zone at diverse stations in the open ocean by analyzing samples collected using multiple unit large volume in-situ filtration systems in the Pacific, Atlantic and Indian oceans. Our results demonstrate that barite is an organo-mineral particularly abundant at intermediate depths throughout the world’s ocean regardless of saturation state with respect to barite. This is confirming the notion of precipitation at depths of intense organic matter mineralization. Our observations further support the link between barite formation and microbial activity, demonstrated by the association of barite particles with organic matter aggregates and with extracellular polymeric substances. Evidence for microbial mediation is consistent with previous experimental work showing that in bacterial biofilms Ba binds to phosphate groups on cell surfaces and within extracellular polymeric substances. This organo-accumulation promotes high concentrations of Ba leading to saturated microenvironments and nucleation sites favoring precipitation. The distribution of Ba isotopes in the water column and in particulate matter is also consistent with the proposed precipitation mechanism.
    Description: This study was supported by the European Regional Development Fund (ERDF) co-financed grants CGL2017-92600-EXP and PID2019-104624RB-I00 (Agencia Estatal de Investigación, Ministerio de Ciencia e Innovación, Spain), Research Groups RNM-179 and BIO 103, and Excellence Projects P18-RT-3804 and P18-RT-4074 (Junta de Andalucía), Unidad Científica de Excelencia UCE-PP2016-05 (University of Granada) and grant OCE-1443577.
    Keywords: Pelagic barite ; Organo-mineralization ; Barite saturation state ; Extracellular polymeric substances ; Bioaccumulation
    Repository Name: Woods Hole Open Access Server
    Type: Article
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