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Title: Erosion in northwest Tibet from in-situ-produced cosmogenic Be-10 and Al-26 in bedrock
Authors: Kong, P
Na, CG
Fink, D
Ding, L
Huang, FX
Keywords: Erosion
In-situ processing
Issue Date: Jan-2007
Publisher: John Wiley & Sons
Citation: Kong, P., Na, C. G., Fink, D., Ding, L., & Huang, F. X. (2007). Erosion in northwest Tibet from in-situ-produced cosmogenic Be-10 and Al-26 in bedrock. Earth Surface Processes and Landforms, 32(1), 116-125. doi:10.1002/esp.1380
Abstract: Concentrations of in-situ-produced cosmogenic nuclides Be-10 and Al-26 in quartz were measured by accelerator mass spectrometry for bedrock basalts and sandstones located in northwest Tibet. The effective exposure ages range between 23 and 134 ka (Be-10) and erosion rates between 4.0 and 24 mm ka(-1). The erosion rates are significantly higher than those in similarly and Antarctica and Australia, ranging between 0.1 and 1 mm ka(-1), suggesting that precipitation is not the major control of erosion of landforms. Comparison of erosion rates in and regions with contrasting tectonic activities suggests that tectonic activity plays a more important role in controlling long-term erosion rates. The obtained erosion rates are, however, significantly lower than the denudation rate of 3000-6000 mm ka(-1) beginning at c. 53 Ma in the nearby Godwin Austen (K2) determined by apatite fission-track thermochronology. It appears that the difference in erosion rates within different time intervals is indicative of increased tectonic activity at c. 5-3 Ma in northwest Tibet. We explain the low erosion rates determined in this study as reflecting reduced tectonic activity in the last million years. A model of localized thinning of the mantle beneath northwest Tibet may account for the sudden increased tectonic activity at c. 5-3 Ma and the later decrease. © 2006, John Wiley & Sons Ltd.
Gov't Doc #: 1222
ISSN: 0197-9337
Appears in Collections:Journal Articles

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