Abstract
| Language | English |
|---|---|
| Pages | 218-230 |
| Number of pages | 13 |
| Journal | Earth and Planetary Science Letters |
| Volume | 493 |
| Early online date | 7 May 2018 |
| DOIs | |
| Publication status | Published - 1 Jul 2018 |
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Centennial- to millennial-scale hard rock erosion rates deduced from luminescence-depth profiles. / Sohbati, Reza; Liu, Jinfeng; Jain, Mayank; Murray, Andrew; Egholm, David; Paris, Richard B.; Guralnik, Benny.
In: Earth and Planetary Science Letters, Vol. 493, 01.07.2018, p. 218-230.Research output: Contribution to journal › Article
TY - JOUR
T1 - Centennial- to millennial-scale hard rock erosion rates deduced from luminescence-depth profiles
AU - Sohbati, Reza
AU - Liu, Jinfeng
AU - Jain, Mayank
AU - Murray, Andrew
AU - Egholm, David
AU - Paris, Richard B.
AU - Guralnik, Benny
PY - 2018/7/1
Y1 - 2018/7/1
N2 - The measurement of erosion and weathering rates in different geomorphic settings and over diverse temporal and spatial scales is fundamental to the quantification of rates and patterns of earth surface processes. A knowledge of the rates of these surface processes helps one to decipher their relative contribution to landscape evolution – information that is crucial to understanding the interaction between climate, tectonics and landscape. Consequently, a wide range of techniques has been developed to determine short- (<102 a) and long-term (>104 a) erosion rates. However, no method is available to quantify hard rock erosion rates at centennial to millennial timescales. Here we propose a novel technique, based on the solar bleaching of luminescence signals with depth into rock surfaces, to bridge this analytical gap. We apply our technique to glacial and landslide boulders in the Eastern Pamirs, China. The calculated erosion rates from the smooth varnished surfaces of 7 out of the 8 boulders sampled in this study vary between <0.038±0.002 and 1.72±0.04 mmka-1 (the eighth boulder gave an anomalously high erosion rate, possibly due to a recent chipping/cracking loss of surface). Given this preferential sampling of smooth surfaces, assumed to arise from grain-by-grain surface loss, we consider these rates as minimum estimates of rock surface denudation rates in the Eastern Pamirs, China.
AB - The measurement of erosion and weathering rates in different geomorphic settings and over diverse temporal and spatial scales is fundamental to the quantification of rates and patterns of earth surface processes. A knowledge of the rates of these surface processes helps one to decipher their relative contribution to landscape evolution – information that is crucial to understanding the interaction between climate, tectonics and landscape. Consequently, a wide range of techniques has been developed to determine short- (<102 a) and long-term (>104 a) erosion rates. However, no method is available to quantify hard rock erosion rates at centennial to millennial timescales. Here we propose a novel technique, based on the solar bleaching of luminescence signals with depth into rock surfaces, to bridge this analytical gap. We apply our technique to glacial and landslide boulders in the Eastern Pamirs, China. The calculated erosion rates from the smooth varnished surfaces of 7 out of the 8 boulders sampled in this study vary between <0.038±0.002 and 1.72±0.04 mmka-1 (the eighth boulder gave an anomalously high erosion rate, possibly due to a recent chipping/cracking loss of surface). Given this preferential sampling of smooth surfaces, assumed to arise from grain-by-grain surface loss, we consider these rates as minimum estimates of rock surface denudation rates in the Eastern Pamirs, China.
U2 - 10.1016/j.epsl.2018.04.017
DO - 10.1016/j.epsl.2018.04.017
M3 - Article
VL - 493
SP - 218
EP - 230
JO - Earth and Planetary Science Letters
T2 - Earth and Planetary Science Letters
JF - Earth and Planetary Science Letters
SN - 0012-821X
ER -