Erosion in northwest Tibet from in-situ-produced cosmogenic 10Be and 26Al in bedrock

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dc.contributor.authorKong, Pen_AU
dc.contributor.authorNa, Cen_AU
dc.contributor.authorFink, Den_AU
dc.contributor.authorDing, Len_AU
dc.contributor.authorHuang, Fen_AU
dc.date.accessioned2021-12-21T00:19:46Zen_AU
dc.date.available2021-12-21T00:19:46Zen_AU
dc.date.issued2007-01en_AU
dc.date.statistics2021-11-09en_AU
dc.description.abstractConcentrations of in-situ-produced cosmogenic nuclides 10Be and 26Al 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 (10Be) and erosion rates between 4·0 and 24 mm ka−1. The erosion rates are significantly higher than those in similarly arid 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 arid 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. 5-3 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. Copyright © 2006 John Wiley & Sons, Ltd.en_AU
dc.identifier.citationKong, P., Na, C., Fink, D., Ding, L., & Huang, F. (2007). Erosion in northwest Tibet from in-situ-produced cosmogenic 10Be and 26Al in bedrock. Earth Surface Processes and Landforms, 32(1), 116-125. doi:10.1002/esp.1380en_AU
dc.identifier.issn1096-9837en_AU
dc.identifier.issue1en_AU
dc.identifier.journaltitleEarth Surface Processes and Landformsen_AU
dc.identifier.pagination116-125en_AU
dc.identifier.urihttps://doi.org/10.1002/esp.1380en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12605en_AU
dc.identifier.volume32en_AU
dc.language.isoenen_AU
dc.publisherWileyen_AU
dc.subjectTibeten_AU
dc.subjectErosionen_AU
dc.subjectTectonicsen_AU
dc.subjectIsotopesen_AU
dc.subjectBeryllium 10en_AU
dc.subjectAluminium 26en_AU
dc.subjectMass spectroscopyen_AU
dc.subjectGeomorphologyen_AU
dc.titleErosion in northwest Tibet from in-situ-produced cosmogenic 10Be and 26Al in bedrocken_AU
dc.typeJournal Articleen_AU
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