Academic Journal
Biological and physical modification of carbonate system parameters along the salinity gradient in shallow hypersaline solar salterns in Trapani, Italy
| العنوان: | Biological and physical modification of carbonate system parameters along the salinity gradient in shallow hypersaline solar salterns in Trapani, Italy |
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| المؤلفون: | Isaji Y., Kawahata H., Kuroda J., Yoshimura T., Ogawa N. O., Suzuki A., Shibuya T., Jiménez-Espejo F. J., Lugli S., Santulli A., Manzi V., Roveri M., Ohkouchi N. |
| المساهمون: | Isaji, Y., Kawahata, H., Kuroda, J., Yoshimura, T., Ogawa, N. O., Suzuki, A., Shibuya, T., Jiménez-Espejo, F. J., Lugli, S., Santulli, A., Manzi, V., Roveri, M., Ohkouchi, N. |
| سنة النشر: | 2017 |
| المجموعة: | Archivio della ricerca dell'Università di Modena e Reggio Emilia (Unimore: IRIS) |
| مصطلحات موضوعية: | Hypersaline environment, Carbonate system, Microbial mat, Biogeochemical cycle, Photosynthetic pigment, Compound-specific isotope analysis |
| الوصف: | e investigated changes in the chemical characteristics of evaporating seawater under the influence of microbial activity by conducting geochemical analyses of the brines and evaporite sediments collected from solar salterns in Trapani, Italy. The microbial activity had a substantial effect on the carbonate system parameters. Dissolved inorganic carbon (DIC) was substantially removed from the brine during the course of evaporation from the seawater to the point where calcium carbonate precipitates, with an accompanying decrease in its carbon isotopic composition (d13CDIC) to as low as 10.6‰. Although the removal of DIC was due to calcium carbonate precipitation, photosynthesis, and the degassing of CO2(aq) induced by evaporation, the presence of 13C-depleted d13CDIC in ponds where calcium carbonate precipitates can be attributed to the dissolution of atmospheric CO2 because of intensive CO2(aq) uptake by photosynthesis, and/or mineralization of organic matter by sulfate reduction. In contrast, d13CDIC increased up to 7.2‰ in the salinity range where halite precipitates, which can be ascribed to the domination of the effect of degassing of CO2(aq) under conditions with reduced microbial activity. A gradual decrease in microbial activity was also reflected in compound-specific d13C of photosynthetic pigments; isotopic fractionation associated with DIC assimilation increased linearly as the evaporation proceeded, indicating DIC-limited conditions within the microbial mats and gypsum crusts because of restricted DIC diffusion from the overlying brine and/or suppression of primary production at higher salinity. ; We investigated changes in the chemical characteristics of evaporating seawater under the influence of microbial activity by conducting geochemical analyses of the brines and evaporite sediments collected from solar salterns in Trapani, Italy. The microbial activity had a substantial effect on the carbonate system parameters. Dissolved inorganic carbon (DIC) was substantially removed from the brine during the ... |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| Relation: | info:eu-repo/semantics/altIdentifier/wos/WOS:000402489500019; volume:208; firstpage:354; lastpage:367; journal:GEOCHIMICA ET COSMOCHIMICA ACTA; https://hdl.handle.net/11380/1322286; info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85018740472; http://www.sciencedirect.com/science/article/pii/S0016703717302284 |
| DOI: | 10.1016/j.gca.2017.04.013 |
| الاتاحة: | https://hdl.handle.net/11380/1322286 https://doi.org/10.1016/j.gca.2017.04.013 http://www.sciencedirect.com/science/article/pii/S0016703717302284 |
| Rights: | info:eu-repo/semantics/openAccess |
| رقم الانضمام: | edsbas.E55CF10E |
| قاعدة البيانات: | BASE |
| DOI: | 10.1016/j.gca.2017.04.013 |
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