Article ID Journal Published Year Pages File Type
6427402 Earth and Planetary Science Letters 2016 11 Pages PDF
Abstract
New surface-exposure dating of six terrace levels with in-situ cosmogenic 10Be indicates the onset of incision phases. Two terrace surfaces from the highest level (T1) sculpted into the oldest preserved alluvial fan (AF1) date back to 53.4±3.2 ka and 43.0±2.7 ka (1σ). T2 surfaces sculpted into the remnants of AF1 have exposure ages of 18.6±1.2 ka and 15.3±0.9 ka, while terraces sculpted into the upper Pleistocene-Holocene fan (AF2) provide ages of 9.3±0.4 ka (T3), 7.1±0.4 ka (T4), 5.2±0.4 ka (T5) and 3.6±0.2 ka (T6). Together with previously published OSL ages yielding the timing of aggradation, we find a correlation between variations in sediment transport with oxygen-isotope records from regions affected by the Indian Summer Monsoon. During periods of increased monsoon intensity and post-Last Glacial Maximum glacial retreat, aggradation occurred in the Kangra Basin, likely due to high sediment flux, whereas periods of weakened monsoon intensity or lower sediment supply coincide with incision.
Related Topics
Physical Sciences and Engineering Earth and Planetary Sciences Earth and Planetary Sciences (General)
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