دورية أكاديمية
A regional assessment of the deglaciation history of the Swiss Plateau based on newly obtained and re-evaluated Be-10 cosmic-ray exposure ages
| العنوان: | A regional assessment of the deglaciation history of the Swiss Plateau based on newly obtained and re-evaluated Be-10 cosmic-ray exposure ages |
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| المؤلفون: | Felix Martin Hofmann, Alexander R. Groos, Ezequiel Garcia Morabito, Julian Struck, Christian Gnägi, Andreas Scharf, Georg Rugel, Silke Merchel, Roland Zech |
| المصدر: | Quaternary Science Advances, Vol 13, Iss , Pp 100124- (2024) |
| بيانات النشر: | Elsevier, 2024. |
| سنة النشر: | 2024 |
| المجموعة: | LCC:Geography. Anthropology. Recreation LCC:Archaeology |
| مصطلحات موضوعية: | Terrestrial in situ cosmogenic nuclides, Exposure dating, Moraine, Erratic boulder, Swiss Plateau, Deglaciation, Geography. Anthropology. Recreation, Archaeology, CC1-960 |
| الوصف: | During marine oxygen isotope stage (MIS) 2, the Swiss Plateau temporarily hosted large piedmont lobe glaciers that retreated after their maximum advance back to the fringe of the Alps. The presence of moraines in this region indicates that overall glacier recession was punctuated by repeated phases of ice-marginal stability and re-advances. The timing of these events in the region formerly covered by the eastern lobe of the Rhône (or Valais) glacier has been controversial and remains poorly constrained due to the lack of chronological data. To fill this gap, 10Be cosmic-ray exposure (CRE) dating was applied to erratic boulders inside the assumed MIS 2 maximum extent of this piedmont lobe. An erratic boulder at an ice-marginal position upstream from the suspected MIS 2 maximum extent gave an age of about 19 ka. Erratic boulders at a presumably younger ice-marginal position (Brästenberg position) yielded an average age of ca. 20 ka. However, several erratic boulders beyond the Brästenberg position gave internally consistent, but stratigraphically too young ages of ca. 17 ka. We cannot rule out that glacier recession from the Brästenberg position began no later than 17 ka. CRE dating of a moraine of a presumably younger ice-marginal position (Solothurn position) gave unrealistically old ages and an incredibly young age (86 ka, 40 ka, and 4 ka). Carbon-14 CRE dating should be applied to provide additional information on the last deglaciation of the Swiss Plateau. Nevertheless, despite outlying ages, the presented chronological data contribute to an overall consistent and increasingly refined chronology of the last deglaciation of the Swiss Plateau when compared with 59 previously published CRE ages. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 2666-0334 |
| Relation: | http://www.sciencedirect.com/science/article/pii/S2666033423000564; https://doaj.org/toc/2666-0334 |
| DOI: | 10.1016/j.qsa.2023.100124 |
| URL الوصول: | https://doaj.org/article/6d24da96017249d48eb38dab5910107a |
| رقم الأكسشن: | edsdoj.6d24da96017249d48eb38dab5910107a |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 26660334 |
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| DOI: | 10.1016/j.qsa.2023.100124 |