Water and dissolved gas geochemistry of the monomictic Paterno sinkhole (central Italy)
This paper describes the chemical and isotope features of water and dissolved gases from lake Paterno (max. depth 54 m), a sinkhole located in the NE sector of the S. Vittorino plain (Rieti, Central Italy), where evidences of past and present hydrothermal activity exists. In winter (February 2011) l...
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| Format: | Article |
| Language: | English |
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PAGEPress Publications
2012-07-01
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| Series: | Journal of Limnology |
| Subjects: | |
| Online Access: | http://www.jlimnol.it/index.php/jlimnol/article/view/479 |
| _version_ | 1828851299249029120 |
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| author | Matteo Nocentini Marco Quartararo Franco Tassi Orlando Vaselli Francesco Capecchiacci Massimiliano Marcelli Roberto Palozzi Dmitri Rouwet Jacopo Cabassi |
| author_facet | Matteo Nocentini Marco Quartararo Franco Tassi Orlando Vaselli Francesco Capecchiacci Massimiliano Marcelli Roberto Palozzi Dmitri Rouwet Jacopo Cabassi |
| author_sort | Matteo Nocentini |
| collection | DOAJ |
| description | This paper describes the chemical and isotope features of water and dissolved gases from lake Paterno (max. depth 54 m), a sinkhole located in the NE sector of the S. Vittorino plain (Rieti, Central Italy), where evidences of past and present hydrothermal activity exists. In winter (February 2011) lake Paterno waters were almost completely mixed, whereas in summer time (July 2011) thermal and chemical stratifications established. During the stratification period, water and dissolved gas chemistry along the vertical water column were mainly controlled by biological processes, such as methanogenesis, sulfate-reduction, calcite precipitation, denitrification, and NH4 and H2 production. Reducing conditions at the interface between the bottom sediments and the anoxic waters are responsible for the relatively high concentrations of dissolved iron (Fe) and manganese (Mn), likely present in their reduced oxidation state. Minerogenic and biogenic products were recognized at the lake bottom even during the winter sampling. At relatively shallow depth the distribution of CH4 and CO2 was controlled by methanotrophic bacteria and photosynthesis, respectively. The carbon isotope signature of CO2 indicates a significant contribution of deep-originated inorganic CO2 that is related to the hydrothermal system feeding the CO2-rich mineralized springs discharging in the surrounding areas of lake Paterno. The seasonal lake stratification likely controls the vertical and horizontal distribution of fish populations in the different periods of the year. |
| first_indexed | 2024-12-12T23:29:57Z |
| format | Article |
| id | doaj.art-59cf2ff7c23b49b0bce926c8a5e9ae58 |
| institution | Directory Open Access Journal |
| issn | 1129-5767 1723-8633 |
| language | English |
| last_indexed | 2024-12-12T23:29:57Z |
| publishDate | 2012-07-01 |
| publisher | PAGEPress Publications |
| record_format | Article |
| series | Journal of Limnology |
| spelling | doaj.art-59cf2ff7c23b49b0bce926c8a5e9ae582022-12-22T00:07:50ZengPAGEPress PublicationsJournal of Limnology1129-57671723-86332012-07-01712e27e2710.4081/jlimnol.2012.e27Water and dissolved gas geochemistry of the monomictic Paterno sinkhole (central Italy)Matteo NocentiniMarco QuartararoFranco TassiOrlando VaselliFrancesco CapecchiacciMassimiliano MarcelliRoberto PalozziDmitri RouwetJacopo CabassiThis paper describes the chemical and isotope features of water and dissolved gases from lake Paterno (max. depth 54 m), a sinkhole located in the NE sector of the S. Vittorino plain (Rieti, Central Italy), where evidences of past and present hydrothermal activity exists. In winter (February 2011) lake Paterno waters were almost completely mixed, whereas in summer time (July 2011) thermal and chemical stratifications established. During the stratification period, water and dissolved gas chemistry along the vertical water column were mainly controlled by biological processes, such as methanogenesis, sulfate-reduction, calcite precipitation, denitrification, and NH4 and H2 production. Reducing conditions at the interface between the bottom sediments and the anoxic waters are responsible for the relatively high concentrations of dissolved iron (Fe) and manganese (Mn), likely present in their reduced oxidation state. Minerogenic and biogenic products were recognized at the lake bottom even during the winter sampling. At relatively shallow depth the distribution of CH4 and CO2 was controlled by methanotrophic bacteria and photosynthesis, respectively. The carbon isotope signature of CO2 indicates a significant contribution of deep-originated inorganic CO2 that is related to the hydrothermal system feeding the CO2-rich mineralized springs discharging in the surrounding areas of lake Paterno. The seasonal lake stratification likely controls the vertical and horizontal distribution of fish populations in the different periods of the year.http://www.jlimnol.it/index.php/jlimnol/article/view/479monomictic lake, sinkhole, lake Paterno, water lake chemistry, dissolved gas chemistry. |
| spellingShingle | Matteo Nocentini Marco Quartararo Franco Tassi Orlando Vaselli Francesco Capecchiacci Massimiliano Marcelli Roberto Palozzi Dmitri Rouwet Jacopo Cabassi Water and dissolved gas geochemistry of the monomictic Paterno sinkhole (central Italy) Journal of Limnology monomictic lake, sinkhole, lake Paterno, water lake chemistry, dissolved gas chemistry. |
| title | Water and dissolved gas geochemistry of the monomictic Paterno sinkhole (central Italy) |
| title_full | Water and dissolved gas geochemistry of the monomictic Paterno sinkhole (central Italy) |
| title_fullStr | Water and dissolved gas geochemistry of the monomictic Paterno sinkhole (central Italy) |
| title_full_unstemmed | Water and dissolved gas geochemistry of the monomictic Paterno sinkhole (central Italy) |
| title_short | Water and dissolved gas geochemistry of the monomictic Paterno sinkhole (central Italy) |
| title_sort | water and dissolved gas geochemistry of the monomictic paterno sinkhole central italy |
| topic | monomictic lake, sinkhole, lake Paterno, water lake chemistry, dissolved gas chemistry. |
| url | http://www.jlimnol.it/index.php/jlimnol/article/view/479 |
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