Cosmogenic Nuclide Dating of Earthquakes, Faults, and Toppled Blocks

Elements ◽  
2014 ◽  
Vol 10 (5) ◽  
pp. 357-361 ◽  
Author(s):  
L. C. Benedetti ◽  
J. van der Woerd
Keyword(s):  
Cosmogenic Nuclide ◽  
Cosmogenic Nuclide Dating

scholarly journals Cosmogenic nuclide dating of cave sediments in the Eastern Alps and implications for erosion rates

2020 ◽  
Vol 49 (2) ◽  
pp. 107-118
Author(s):  
Philipp Häuselmann ◽  
◽  
Lukas Plan ◽  
Peter Pointner ◽  
Markus Fiebig ◽  
...  
Keyword(s):  
Late Quaternary ◽  
Eastern Alps ◽  
Western Alps ◽  
Valley Bottom ◽  
Cosmogenic Nuclide ◽  
Base Level ◽  
Multi Level ◽  
Slow Evolution ◽  
Karst Systems ◽  
Cosmogenic Nuclide Dating

Karstic caves are created by water eroding and corroding rocks that can be dissolved. Since both the spring areas of caves (normally at the valley bottom) as well as the recharge is controlled by superficial processes, the morphology of the cave bears strong links to these influences. Lowering of local base levels promotes the development of horizontal phreatic cave passages at progressively lower elevations, resulting in the formation of multi-level karst systems. Upon the next lowering of base level, these upper systems become fossilized, and sediment trapped within them may remain preserved for millions of years. Dating these sediments gives clues regarding the time when the passages were last active, and thus may yield age information for old valley floors. The present paper presents cosmogenic nuclide datings of twelve samples from eight caves in the central part of the Northern Calcareous Alps of Austria. Besides three samples that gave no results, most of the obtained ages are at the Mio-Pliocene boundary or within the Pliocene, as was expected before sampling. No multi-level caves could be sampled at different elevations, thus, the obtained valley deepening rates are averages between the age of sediment deposition and the present-day valley floor. However, the valley deepening rates of 0.12 to 0.21 km/Ma are in accordance to previous findings and corroborate a comparatively slow evolution of base level lowering in the Eastern Alps compared to the fast (Late Quaternary) evolution in the Central and Western Alps.

Late Pleistocene landscape evolution in south-central Chile constrained by luminescence and stable cosmogenic nuclide dating

2010 ◽  
Vol 122 (7-8) ◽  
pp. 1235-1247 ◽  
Author(s):  
Katrin Rehak ◽  
Samuel Niedermann ◽  
Frank Preusser ◽  
Manfred R. Strecker ◽  
Helmut P. Echtler
Keyword(s):  
Late Pleistocene ◽  
Landscape Evolution ◽  
Central Chile ◽  
Cosmogenic Nuclide ◽  
South Central ◽  
Cosmogenic Nuclide Dating

scholarly journals Feldspar flotation as a quartz-purification method in cosmogenic nuclide dating: A case study of fluvial sediments from the Pamir

MethodsX ◽  
2018 ◽  
Vol 5 ◽  
pp. 717-726 ◽  
Author(s):  
Vasila A. Sulaymonova ◽  
Margret C. Fuchs ◽  
Richard Gloaguen ◽  
Robert Möckel ◽  
Silke Merchel ◽  
...  
Keyword(s):  
Fluvial Sediments ◽  
Purification Method ◽  
Cosmogenic Nuclide ◽  
Cosmogenic Nuclide Dating

scholarly journals Very low inheritance in cosmogenic surface exposure ages of glacial deposits: A field experiment from two Norwegian glacier forelands

The Holocene ◽  
2017 ◽  
Vol 27 (9) ◽  
pp. 1406-1414 ◽  
Author(s):  
John A Matthews ◽  
Richard A Shakesby ◽  
Derek Fabel
Keyword(s):  
Field Experiment ◽  
Ice Sheets ◽  
Viable Alternative ◽  
Rock Fragments ◽  
Perceived Need ◽  
Cosmogenic Nuclide ◽  
Exposure Age ◽  
Cosmogenic Nuclide Dating ◽  
Southern Norway ◽  
Exposure Ages

Terrestrial cosmogenic nuclide dating has been widely used to estimate the surface exposure age of bedrock and boulder surfaces associated with deglaciation and Holocene glacier variations, but the effect of inherited age has been rarely directly addressed. In this study, small clasts, embedded in flute surfaces on two cirque glacier forelands in Jotunheimen, southern Norway and deposited within the last ~60 years, were used to test whether such clasts have the modern surface exposure age expected in the absence of inheritance. Two different approaches were taken involving dating of (1) a single clast of cobble size from the proglacial area of Austanbotnbreen, and (2) 75 clasts mostly of pebble size from the proglacial area of Storbreen crushed and treated as a single sample. 10Be surface exposure ages were 99 ± 98 and 368 ± 90 years, respectively, with 95% confidence (±2σ). It is concluded that (1) these small glaciers have eroded and deposited rock fragments with a cosmogenic zero or near-zero concentration, (2) the likelihood of inherited cosmogenic nuclide concentrations in similar rock fragments deposited by larger warm-based glaciers and ice sheets should be small, and (3) combining a large number of small rock particles into one sample rather than using single large clasts of boulder size may provide a viable alternative to the commonly perceived need for five or more independent estimates of exposure age per site.

Sign in / Sign up

Export Citation Format

Share Document