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Assessing the age-weathering correspondence of cosmogenic 21 Ne dated Pleistocene surfaces by the Schmidt hammer
The Schmidt Hammer (SH) method is used to quantify the rock weathering degree and has been proposed as a relative dating tool. Terrestrial Cosmogenic Nuclide (TCN) methods provide absolute exposure ages for erosive surfaces. Few works combine both methods for surfaces older than the Holocene. We com...
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Published in: | Earth surface processes and landforms 2009-06, Vol.34 (8), p.1121-1125 |
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Main Authors: | , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | The Schmidt Hammer (SH) method is used to quantify the rock weathering degree and has been proposed as a relative dating tool. Terrestrial Cosmogenic Nuclide (TCN) methods provide absolute exposure ages for erosive surfaces. Few works combine both methods for surfaces older than the Holocene. We compare data obtained by both methods for
c.
150 ka
bp
glacial and fluvial erosive granite surfaces from northwest Spain. Rebound values (
R
) have been firstly compared with the rock density to assess the correlation with the rock strength, independently from influence of factors such as wetness and roughness in the
R
‐values. For erosive glacial surfaces older than 100 ka
R
‐values are confined in a narrow range, with no differences within errors. Stepped fluvial surfaces of 700 m to 70 m above present sea level show an inverse correspondence between TCN ages and
R
‐values, although no age predictions can be done on the basis of the
R
‐values. Thus, age inferences exclusively based on
R
‐values may not be realistic, but SH studies could be a useful tool for selecting surfaces for TCN dating. Copyright © 2009 John Wiley & Sons, Ltd. |
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ISSN: | 0197-9337 1096-9837 |
DOI: | 10.1002/esp.1802 |