36Cl measurements with a gas-filled magnet at 6 MV

Vockenhuber, Christof; Miltenberger, Klaus-Ulrich; Synal, Hans-Arno

doi:10.1016/j.nimb.2018.12.046

Cited by 30 publications

(29 citation statements)

References 26 publications

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“…A 35 Cl‐enriched spike (Ivy‐Ochs et al, ) was added, and the samples were dissolved with HNO 3 (Prager et al, ). Measurements of 36 Cl were conducted at the Laboratory of Ion Beam Physics 6 MV TANDEM AMS system at ETH‐Zürich using a gas‐filled magnet to separate the isobar 36 S (Vockenhuber et al, ) and calibrated with the internal K382/4N standard (Christl et al, ). The AMS data with and without blank correction are shown in Table S6.…”

Section: Methodsmentioning

confidence: 99%

Chemical Versus Mechanical Denudation in Meta‐Clastic and Carbonate Bedrock Catchments on Crete, Greece, and Mechanisms for Steep and High Carbonate Topography

et al. 2019

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On Crete—as is common elsewhere in the Mediterranean—carbonate massifs form high mountain ranges whereas topography is lower in areas with meta‐clastic rocks. This observation suggests that differences in denudational processes between carbonate‐rich rocks and quartzofeldspathic units impart a fundamental control on landscape evolution. Here we present new cosmogenic basin‐average denudation rate measurements from both 10Be and 36Cl in meta‐clastic and carbonate bedrock catchments, respectively, to assess relationships between denudation rates, processes, and topographic form. We compare total denudation rates to dissolution rates calculated from 49 new and previously published water samples. Basin‐average denudation rates of meta‐clastic and carbonate catchments are similar, with mean values of ~0.10 mm/a and ~0.13 mm/a, respectively. The contribution of dissolution to total denudation rate was <10% in the one measured meta‐clastic catchment, and ~40% for carbonate catchments (~0.05 mm/a), suggesting the dominance of physical over chemical weathering at the catchment scale in both rock types. Water mass‐balance calculations for three carbonate catchments suggests 40–90% of surface runoff is lost to groundwater. To explore the impact of dissolution and infiltration to groundwater on relief, we develop a numerical model for carbonate denudation. We find that dissolution modifies the river profile channel steepness, and infiltration changes the fluvial response time to external forcing. Furthermore, we show that infiltration of surface runoff to groundwater in karst regions is an efficient way to steepen topography and generate the dramatic relief in carbonates observed throughout Crete and the Mediterranean.

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Section: Methodsmentioning

confidence: 99%

Chemical Versus Mechanical Denudation in Meta‐Clastic and Carbonate Bedrock Catchments on Crete, Greece, and Mechanisms for Steep and High Carbonate Topography

et al. 2019

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“…Measurement of both 37 Cl/ 35 Cl as well as 36 Cl/Cl ratios is with the 6 MV tandem accelerator at Ion Beam Physics, ETH Zurich. 36 Cl/Cl ratios were measured against the ETH internal standard K382/4N with a value of 36 Cl/Cl = 17.36 × 10 −12 which has been calibrated to international AMS standards (Vockenhuber et al, 2019). Sample ratios were corrected for a blank value of 3.2 × 10 −15 .…”

Section: Cosmogenic Nuclide Surface Exposure Datingmentioning

confidence: 99%

Constraining the Age and Source Area of the Molveno landslide Deposits in the Brenta Group, Trentino Dolomites (Italy)

et al. 2020

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Rock avalanches are low frequency natural hazards that can alter landscape morphology, and constraining the timing, volume and emplacement dynamics of prehistoric rock avalanches is crucial for understanding the hazards posed by these events. Here we perform cosmogenic nuclide dating, topographic reconstruction and runout modeling of the Molveno rock avalanche, located north of Lake Garda in the Province of Trento, Italy. The unique morphology of the deposits, which features numerous large scarps and prominent lineaments, have previously led researchers to interpret the Molveno rock avalanche as being the result of multiple events. Our results show that the Molveno rock avalanche had a volume of approximately 600 Mm 3 , and failed from a prominent niche located on Monte Soran. 36 Cl cosmogenic nuclide dating results shows that the deposits were emplaced as a single event approximately 4.8 ± 0.5 ka, and suggests that the unique deposit morphology is due to the emplacement processes acting during and soon after failure. Numerical runout modeling shows that this morphology could have resulted from a combination of runup and extensional spreading of the debris along the complex valley floor topography. The ages we determined for this event are coincident with the nearby Marocca Principale rock avalanche (5.3 ± 0.9 ka), which may suggest a common trigger. Our results have important implications for interpreting the morphology of rock avalanche deposits, and contribute to the evolving understanding of rock avalanche processes in the Alps.

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“…; Vockenhuber et al . ). Uncertainties on reported concentrations (1σ) include AMS standard reproducibility, counting statistics, and the standard mean error of the samples.…”

Section: Methodsmentioning

confidence: 97%

Timing and flow pattern of the Orta Glacier (European Alps) during the Last Glacial Maximum

Braakhekke

Ivy‐Ochs

Monegato

et al. 2020

Boreas

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Knowledge of the glacial chronologies for the Last Glacial Maximum (LGM) helps in understanding the interactions between climate, topography and glacier development. In this sense, the investigation of the Lake Orta moraine amphitheatre (Alpine foreland, northern Italy) allowed spatial and temporal reconstruction of the Orta Glacier. The end‐moraine system was investigated by means of geomorphological field surveys, analysis of 13 rock samples for cosmogenic 10Be and 36Cl concentrations, and remote sensing analysis. The dating results indicate that the age of the outer moraine belt is concordant with the LGM culmination at 26.5–23 ka, as found in other amphitheatres in the Alps. This new age estimate of the outermost moraines shows that the maximum extent of the Orta Glacier during the LGM was significantly bigger than recently suggested. A younger stabilization phase of the glacier front at about 19 ka indicates that the onset of the withdrawal of glaciers from the lower Alpine valleys started later. Provenance analysis of the boulders shows that the greatest contribution of ice to the Orta Glacier came from the Anzasca Valley rather than the major Ossola Valley. This reflects the closeness (about 45 km) to the foreland of the high‐elevated accumulation area of the Monte Rosa massif (4634 m a.s.l.), whose eastern glacier seems to have reached the lower valley faster than the trunk Toce Glacier. This fact underlines the key role played by high‐elevation accumulation areas that are located close to the foreland in controlling the path and geometry of major glaciers in the Alps.

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36Cl measurements with a gas-filled magnet at 6 MV

Cited by 30 publications

References 26 publications

Chemical Versus Mechanical Denudation in Meta‐Clastic and Carbonate Bedrock Catchments on Crete, Greece, and Mechanisms for Steep and High Carbonate Topography

Chemical Versus Mechanical Denudation in Meta‐Clastic and Carbonate Bedrock Catchments on Crete, Greece, and Mechanisms for Steep and High Carbonate Topography

Constraining the Age and Source Area of the Molveno landslide Deposits in the Brenta Group, Trentino Dolomites (Italy)

Timing and flow pattern of the Orta Glacier (European Alps) during the Last Glacial Maximum

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36Cl measurements with a gas-filled magnet at 6 MV

Cited by 30 publications

References 26 publications

Chemical Versus Mechanical Denudation in Meta‐Clastic and Carbonate Bedrock Catchments on Crete, Greece, and Mechanisms for Steep and High Carbonate Topography

Chemical Versus Mechanical Denudation in Meta‐Clastic and Carbonate Bedrock Catchments on Crete, Greece, and Mechanisms for Steep and High Carbonate Topography

Constraining the Age and Source Area of the Molveno landslide Deposits in the Brenta Group, Trentino Dolomites (Italy)

Timing and flow pattern of the Orta Glacier (European Alps) during the Last Glacial Maximum

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36Cl measurements with a gas-filled magnet at 6 MV