| _version_ | 1867171003446067200 |
|---|---|
| author | Wüthrich, Lorenz Brändli, Claudio Braucher, Régis Veit, Heinz Haghipour, Negar Terrizzano, Carla Christl, Marcus Gnägi, Christian Zech, Roland |
| author_facet | Wüthrich, Lorenz Brändli, Claudio Braucher, Régis Veit, Heinz Haghipour, Negar Terrizzano, Carla Christl, Marcus Gnägi, Christian Zech, Roland |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | During the Pleistocene, glaciers advanced repeatedly from the Alps onto the Swiss Plateau. Numeric age control for the last glaciation is good and thus the area is well suited to test a method which has so far not been applied to till in Switzerland. In this study, we apply in situ produced cosmogenic 10Be depth profile dating to several till deposits. Three sites lie inside the assumed Last Glacial Maximum (LGM) extent of the Rhône and Aare glaciers (Bern, Deisswil, Steinhof) and two lie outside (Niederbuchsiten, St. Urban). All sites are strongly affected by denudation, and all sites have reached steady state, i.e., the 10Be production is in equilibrium with radioactive decay and denudational losses. Deposition ages can therefore not be well constrained. Assuming constant denudation rates of 5 cm/kyr, total denudation on the order of 100 cm for sites within the extent of the LGM and up to tens of meters for older moraines are calculated. Denudation events, for example related to periglacial conditions during the LGM, mitigate the need to invoke such massive denudation and could help to explain high 10Be concentrations at great depths, which we here dub "pseudo-inheritance". This term should be used to distinguish conceptionally from "true inheritance", i.e., high concentrations derived from the catchment. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_884060 |
| institution | PANGAEA |
| language | en |
| publishDate | 2017 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Beryllium 10 (10Be) concentrations from till in the western Swiss lowlands Wüthrich, Lorenz Brändli, Claudio Braucher, Régis Veit, Heinz Haghipour, Negar Terrizzano, Carla Christl, Marcus Gnägi, Christian Zech, Roland Beryllium-10; Beryllium-10, production rate per year; Beryllium-10, standard deviation; Beryllium-10/Beryllium-9; Beryllium-10/Beryllium-9 ratio, standard deviation; Carrier; Deisswil; DEPTH, sediment/rock; Elevation of event; Event label; Gurten; Latitude of event; Longitude of event; Mass per area; Niederbuchsiten; Quartz, dissolved; ROCK; Rock sample; Sample code/label; St_Urban; Steinhof; Switzerland During the Pleistocene, glaciers advanced repeatedly from the Alps onto the Swiss Plateau. Numeric age control for the last glaciation is good and thus the area is well suited to test a method which has so far not been applied to till in Switzerland. In this study, we apply in situ produced cosmogenic 10Be depth profile dating to several till deposits. Three sites lie inside the assumed Last Glacial Maximum (LGM) extent of the Rhône and Aare glaciers (Bern, Deisswil, Steinhof) and two lie outside (Niederbuchsiten, St. Urban). All sites are strongly affected by denudation, and all sites have reached steady state, i.e., the 10Be production is in equilibrium with radioactive decay and denudational losses. Deposition ages can therefore not be well constrained. Assuming constant denudation rates of 5 cm/kyr, total denudation on the order of 100 cm for sites within the extent of the LGM and up to tens of meters for older moraines are calculated. Denudation events, for example related to periglacial conditions during the LGM, mitigate the need to invoke such massive denudation and could help to explain high 10Be concentrations at great depths, which we here dub "pseudo-inheritance". This term should be used to distinguish conceptionally from "true inheritance", i.e., high concentrations derived from the catchment. |
| title | Beryllium 10 (10Be) concentrations from till in the western Swiss lowlands |
| topic | Beryllium-10; Beryllium-10, production rate per year; Beryllium-10, standard deviation; Beryllium-10/Beryllium-9; Beryllium-10/Beryllium-9 ratio, standard deviation; Carrier; Deisswil; DEPTH, sediment/rock; Elevation of event; Event label; Gurten; Latitude of event; Longitude of event; Mass per area; Niederbuchsiten; Quartz, dissolved; ROCK; Rock sample; Sample code/label; St_Urban; Steinhof; Switzerland |
| url | https://doi.org/10.1594/PANGAEA.884060 |