Varve-dated depositional history since 1800 CE reconstructed using physical and chemical sediment parameters derived from a gravity core of proglacial Lago Frías, North Patagonian Andes, Argentina
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| Formato: | Dataset Open Access |
| Lenguaje: | en |
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PANGAEA
2026
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| _version_ | 1867170480714153984 |
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| author | Zolitschka, Bernd Gebhardt, Andrea Catalina Gogorza, Claudia |
| author_facet | Zolitschka, Bernd Gebhardt, Andrea Catalina Gogorza, Claudia |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Physical (CT scanning, magnetic susceptibility, dry density, water content, grainsizes) and chemical parameters (XRF core scanning, CNS analysis) in combination with radiometric dating (14C, 137Cs, 210Pb) and microfacies analysis characterize the short (1.35 m) sediment record from proglacial Lago Frías (Rio Negro Province, Argentina) as annually laminated (varved) interrupted by two events. These events relate to the eruption of Volcán Calbuco (1893 CE), which produced a distinct 1 cm-thick tephra layer, and to a mass movement deposit (53 cm) with an erosive base linked to the Great Chilean Earthquake (1960 CE). The radiometric chronology is distinctly refined by varve chronology. Proglacial varves were analysed by greyscale variations of high-resolution radiographies obtained by CT scanning and employing the BMPix and PEAK tools (Weber et al., 2010) for normalising, recognition and counting of these clastic laminations. Microfacies analysis was utilised for verification. Correlation of varve thickness with instrumental meteorological data since 1960 CE provides a weak correlation with instrumental summer temperature data, while the floating chronology from 1803-1893 CE does not correlate with summer temperature reconstructions based on tree-ring data. Nevertheless, this lacustrine sediment record provides an environmental reconstruction for the last two centuries with valuable insights into climatically-controlled depositional processes (Zolitschka et al., 2026, subm.). |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_992634 |
| institution | PANGAEA |
| language | en |
| publishDate | 2026 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Varve-dated depositional history since 1800 CE reconstructed using physical and chemical sediment parameters derived from a gravity core of proglacial Lago Frías, North Patagonian Andes, Argentina Zolitschka, Bernd Gebhardt, Andrea Catalina Gogorza, Claudia CT scanning; global warming; Little Ice Age; mass movements; proglacial varves; radiometric dating; Tephrastatigraphy; XRF-core scanning Physical (CT scanning, magnetic susceptibility, dry density, water content, grainsizes) and chemical parameters (XRF core scanning, CNS analysis) in combination with radiometric dating (14C, 137Cs, 210Pb) and microfacies analysis characterize the short (1.35 m) sediment record from proglacial Lago Frías (Rio Negro Province, Argentina) as annually laminated (varved) interrupted by two events. These events relate to the eruption of Volcán Calbuco (1893 CE), which produced a distinct 1 cm-thick tephra layer, and to a mass movement deposit (53 cm) with an erosive base linked to the Great Chilean Earthquake (1960 CE). The radiometric chronology is distinctly refined by varve chronology. Proglacial varves were analysed by greyscale variations of high-resolution radiographies obtained by CT scanning and employing the BMPix and PEAK tools (Weber et al., 2010) for normalising, recognition and counting of these clastic laminations. Microfacies analysis was utilised for verification. Correlation of varve thickness with instrumental meteorological data since 1960 CE provides a weak correlation with instrumental summer temperature data, while the floating chronology from 1803-1893 CE does not correlate with summer temperature reconstructions based on tree-ring data. Nevertheless, this lacustrine sediment record provides an environmental reconstruction for the last two centuries with valuable insights into climatically-controlled depositional processes (Zolitschka et al., 2026, subm.). |
| title | Varve-dated depositional history since 1800 CE reconstructed using physical and chemical sediment parameters derived from a gravity core of proglacial Lago Frías, North Patagonian Andes, Argentina |
| topic | CT scanning; global warming; Little Ice Age; mass movements; proglacial varves; radiometric dating; Tephrastatigraphy; XRF-core scanning |
| url | https://doi.org/10.1594/PANGAEA.992634 |