Origin and hydrogeochemistry of a shallow flow-through lake on a Pleistocene piedmont, northern Spanish Meseta
<p>The Cristo lagoon, situated on Neogene deposits in the northern Spanish Meseta, occupies a shallow depression on a Pleistocene piedmont. The development of the lacustrine depression on the piedmont was favoured by the fault network, reinforced by substrateloss by weathering, probably during...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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PAGEPress Publications
2013-06-01
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| Series: | Journal of Limnology |
| Subjects: | |
| Online Access: | http://www.jlimnol.it/index.php/jlimnol/article/view/559 |
| _version_ | 1818540398632501248 |
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| author | Margarita Jambrina Ildefonso Armenteros Ángel Corrochano Clemente Recio |
| author_facet | Margarita Jambrina Ildefonso Armenteros Ángel Corrochano Clemente Recio |
| author_sort | Margarita Jambrina |
| collection | DOAJ |
| description | <p>The Cristo lagoon, situated on Neogene deposits in the northern Spanish Meseta, occupies a shallow depression on a Pleistocene piedmont. The development of the lacustrine depression on the piedmont was favoured by the fault network, reinforced by substrateloss by weathering, probably during the late Quaternary. Even during the hot summer season, salinity is low, with concentrations of total dissolved solids (TDS) being around 150 mg L<sup>–1</sup>. Only when the lagoon is almost dry do TDS concentrations exceed 500 mg L<sup>–1</sup>, sometimes rising as high as 1700 mg L<sup>–1</sup>. Whenthe lake level is high, lake chemistry is dominated by Na<sup>+</sup>, Ca<sup>2+</sup>, HCO<sub>3</sub><sup>–</sup> and Cl<sup>–</sup>. During drier stages, there is a relative increase in Ca<sup>2+</sup>, Mg<sup>2+</sup>, Cl<sup>–</sup>, and SO<sub>4</sub><sup>2–</sup>, trending toward a calcium chloride-sulphate brine. Values of pH are above 9 during late spring and summer, resulting primarily from evaporative degassing favoured by the shallow depth of water, and secondarily from photosynthesis by the abundant submerged macrophytes. The infilling deposits, less than 0.5 m thick, are dark brown, massive, sandy muds consisting of quartz and clays (illite, kaolinite, smectite), all of which are allogenic in origin. The main source of dissolved sulphate was the oxidation of sulphides during weathering of lower Palaeozoic rocks in the catchment area. The 13C-depleted nature of dissolved inorganic carbon indicates an origin mostly by respiration and oxidation of organic matter. Geomorphology and hydrogeochemistry indicate a flow-through lake dominated essentially by groundwater flows.</p><p class="p1"> </p> |
| first_indexed | 2024-12-11T21:54:50Z |
| format | Article |
| id | doaj.art-7d68d93295394db3a7c9d736220c41e5 |
| institution | Directory Open Access Journal |
| issn | 1129-5767 1723-8633 |
| language | English |
| last_indexed | 2024-12-11T21:54:50Z |
| publishDate | 2013-06-01 |
| publisher | PAGEPress Publications |
| record_format | Article |
| series | Journal of Limnology |
| spelling | doaj.art-7d68d93295394db3a7c9d736220c41e52022-12-22T00:49:21ZengPAGEPress PublicationsJournal of Limnology1129-57671723-86332013-06-01722e29e2910.4081/jlimnol.2013.e29542Origin and hydrogeochemistry of a shallow flow-through lake on a Pleistocene piedmont, northern Spanish MesetaMargarita Jambrina0Ildefonso Armenteros1Ángel Corrochano2Clemente Recio3Salamanca University, SpainSalamanca University, SpainSalamanca University, SpainSalamanca University, Spain<p>The Cristo lagoon, situated on Neogene deposits in the northern Spanish Meseta, occupies a shallow depression on a Pleistocene piedmont. The development of the lacustrine depression on the piedmont was favoured by the fault network, reinforced by substrateloss by weathering, probably during the late Quaternary. Even during the hot summer season, salinity is low, with concentrations of total dissolved solids (TDS) being around 150 mg L<sup>–1</sup>. Only when the lagoon is almost dry do TDS concentrations exceed 500 mg L<sup>–1</sup>, sometimes rising as high as 1700 mg L<sup>–1</sup>. Whenthe lake level is high, lake chemistry is dominated by Na<sup>+</sup>, Ca<sup>2+</sup>, HCO<sub>3</sub><sup>–</sup> and Cl<sup>–</sup>. During drier stages, there is a relative increase in Ca<sup>2+</sup>, Mg<sup>2+</sup>, Cl<sup>–</sup>, and SO<sub>4</sub><sup>2–</sup>, trending toward a calcium chloride-sulphate brine. Values of pH are above 9 during late spring and summer, resulting primarily from evaporative degassing favoured by the shallow depth of water, and secondarily from photosynthesis by the abundant submerged macrophytes. The infilling deposits, less than 0.5 m thick, are dark brown, massive, sandy muds consisting of quartz and clays (illite, kaolinite, smectite), all of which are allogenic in origin. The main source of dissolved sulphate was the oxidation of sulphides during weathering of lower Palaeozoic rocks in the catchment area. The 13C-depleted nature of dissolved inorganic carbon indicates an origin mostly by respiration and oxidation of organic matter. Geomorphology and hydrogeochemistry indicate a flow-through lake dominated essentially by groundwater flows.</p><p class="p1"> </p>http://www.jlimnol.it/index.php/jlimnol/article/view/559Cristo laggon, geolimnology, hydrogeochemistry, stable isotopes |
| spellingShingle | Margarita Jambrina Ildefonso Armenteros Ángel Corrochano Clemente Recio Origin and hydrogeochemistry of a shallow flow-through lake on a Pleistocene piedmont, northern Spanish Meseta Journal of Limnology Cristo laggon, geolimnology, hydrogeochemistry, stable isotopes |
| title | Origin and hydrogeochemistry of a shallow flow-through lake on a Pleistocene piedmont, northern Spanish Meseta |
| title_full | Origin and hydrogeochemistry of a shallow flow-through lake on a Pleistocene piedmont, northern Spanish Meseta |
| title_fullStr | Origin and hydrogeochemistry of a shallow flow-through lake on a Pleistocene piedmont, northern Spanish Meseta |
| title_full_unstemmed | Origin and hydrogeochemistry of a shallow flow-through lake on a Pleistocene piedmont, northern Spanish Meseta |
| title_short | Origin and hydrogeochemistry of a shallow flow-through lake on a Pleistocene piedmont, northern Spanish Meseta |
| title_sort | origin and hydrogeochemistry of a shallow flow through lake on a pleistocene piedmont northern spanish meseta |
| topic | Cristo laggon, geolimnology, hydrogeochemistry, stable isotopes |
| url | http://www.jlimnol.it/index.php/jlimnol/article/view/559 |
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