scholarly journals Surface Exposure Dating and Geophysical Tomography of the Royal Arches Meadow Rock Avalanche, Yosemite Valley, California

2020 ◽  
Vol 8 ◽  
Author(s):  
Marcus Pacheco ◽  
Alain M. Plattner ◽  
Greg M. Stock ◽  
Dylan H. Rood ◽  
Christopher J. Pluhar
Keyword(s):  
Rock Avalanche ◽  
Surface Exposure Dating ◽  
Exposure Dating ◽  
Yosemite Valley ◽  
Geophysical Tomography

Surface exposure dating of the Veliki vrh rock avalanche in Slovenia associated with the 1348 earthquake

2014 ◽  
Vol 22 ◽  
pp. 33-42 ◽  
Author(s):  
Silke Merchel ◽  
Irena Mrak ◽  
Régis Braucher ◽  
Lucilla Benedetti ◽  
Blaž Repe ◽  
...  
Keyword(s):  
Rock Avalanche ◽  
Surface Exposure Dating ◽  
Exposure Dating

Reconstructing the Timing of Flash Floods Using 10Be Surface Exposure Dating at Leidy Creek Alluvial Fan and Valley, White Mountains, California–Nevada, USA

2015 ◽  
Vol 83 (1) ◽  
pp. 178-186 ◽  
Author(s):  
Markus Fuchs ◽  
Rebecca Reverman ◽  
Lewis A. Owen ◽  
Kurt L. Frankel
Keyword(s):  
Flash Floods ◽  
Alluvial Fan ◽  
Optically Stimulated Luminescence ◽  
Alluvial Fans ◽  
White Mountains ◽  
The Holocene ◽  
Surface Exposure Dating ◽  
Exposure Dating ◽  
Outburst Floods ◽  
Glacial Lake Outburst Floods

AbstractLarge alluvial fans characterize the piedmonts of the White Mountains, California–Nevada, USA, with large boulders strewn across their surfaces. The boulders are interpreted as flash floods deposits with an unclear trigger for the transport process. Several triggers are possible, including glacial lake outburst floods (GLOFs), thunderstorms or rainfall on snow cover. From a paleoenvironmental perspective, the origin of the flash floods is of fundamental importance. The alluvial fans that flank the White Mountains at Leidy Creek display particularly impressive examples of these deposits. The boulder deposits and the source catchment at Leidy Creek were examined using 10Be terrestrial cosmogenic nuclide (TCN) surface exposure dating to help elucidate their age and origin. All boulders dated on the alluvial fans date to the Holocene. This is in accordance with the geomorphic analyses of the Leidy Creek catchment and its terraces and sediment ridges, which were also dated to the Holocene using optically stimulated luminescence (OSL) and 10Be surface exposure. The results suggest that the boulders on the alluvial fan were deposited by flash floods during thunderstorm events affecting the catchment of the Leidy Creek valley. Paleomonsoonal-induced mid-Holocene flash floods are the most plausible explanation for the discharges needed for these boulder aggradations, but a regional dataset is needed to confirm this explanation.

scholarly journals A zero-exposure time test on an erratic boulder: evaluating the problem of pre-exposure in Surface Exposure Dating

2009 ◽  
Vol 58 (1) ◽  
pp. 1-11
Author(s):  
Lucia A. Abbühl ◽  
Naki Akcar ◽  
Stefan Strasky ◽  
Angela A. Graf ◽  
Susan Ivy-Ochs ◽  
...  
Keyword(s):  
Exposure Time ◽  
Prior Exposure ◽  
Lateral Moraine ◽  
Surface Exposure Dating ◽  
Exposure Dating ◽  
Three Samples ◽  
Time Test ◽  
The Right ◽  
Geometric Relationship ◽  
Erratic Boulder

Abstract. The method of surface exposure dating using in-situ produced cosmogenic nuclides has become an important and widely applied tool in Quaternary science. One application is the dating of erratic boulders on moraines. An important problem however remains: the evaluation of potential pre-exposure time for samples from boulder surfaces. We have tested pre-exposure by sampling all sides of a recently exposed boulder in order to measure inherited nuclides from prior exposure periods. The sampled erratic boulder rests on the right lateral moraine of the most recent advance of the Glacier de Tsijiore Nouve in the Arolla Valley, Switzerland. Mapping of the area was done to reconstruct the Holocene fluctuations of the glacier. This glacier is especially useful for such a test as it is characterized by an ideal geometric relationship between accumulation and ablation area and, therefore, responds rapidly to mass-balance changes. The sampled boulder was deposited in 1991. Assuming no prior exposure the expected concentration of a given cosmogenic nuclide should be near zero. The 10Be/9Be ratios of the five measured samples were indistinguishable from blank values within the given errors, demonstrating that the samples did not experience pre-exposure. Three samples measured for 21Ne reveal 21Ne/20Ne and 22Ne/20Ne ratios similar to those of air, with no detectable prior cosmogenic Ne accumulation.

Surface exposure dating by in-situ produced cosmogenic nuclides: chemical mineral separation of purified quartz

2001 ◽  
Vol 89 (11-12) ◽  
Author(s):  
M. Altmaier ◽  
W. Klas ◽  
U. Herpers
Keyword(s):  
Cosmic Radiation ◽  
Cosmogenic Nuclides ◽  
Surface Exposure Dating ◽  
Exposure Dating ◽  
Mineral Separation

The interaction of cosmic radiation with terrestrial matter leads to the

Deglaciation and landscape history around Annapurna, Nepal, based on 10Be surface exposure dating

2009 ◽  
Vol 28 (11-12) ◽  
pp. 1106-1118 ◽  
Author(s):  
Roland Zech ◽  
Michael Zech ◽  
Peter W. Kubik ◽  
Krishna Kharki ◽  
Wolfgang Zech
Keyword(s):  
Landscape History ◽  
Surface Exposure Dating ◽  
Exposure Dating
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