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• W2234853544 abstract "I determined ages and on fluvial terraces of the South Fork of the ShenandoahRiver, Virginia, obtained from depth profiles of in situ 10Be. These dates represent thefirst numerically constrained ages on fluvial terraces in the Shenandoah system, andallow us to assess the timing of perturbations to the river system and to estimate longtermriver incision rates. I sampled three terrace treads near Lynnwood, Virginia,originally identified in mapping completed by King (1950) and Bell (1985). King (1950)suggested a Pleistocene age for the higher terraces, but the terraces are otherwiseundated. The lowest terrace level (T2) is an ~7 m above river level (ARL), and has beeninundated by historic flooding. The higher terraces are ~11 m ARL (T3) and ~16 m ARL(T4). On each surface, I excavated a ~2.5 m deep by ~10 m long trench to identify soilproperties and to collect ~5 kg bulk samples at 0.25 m depth intervals from 0.25 m to1.75 m depths. The 250-500 μm quartz sand fraction from the soil was extracted toanalyze for 10Be concentration. To estimate terrace age corrected for inherited 10Be, AMATLAB script iteratively solved for age and inheritance through a least squares fit ofmodeled 10Be concentration profiles to measured profiles on each terrace.T3 showed an exponential profile, which yielded minimum age of 162 kyr andinheritance of 4.62 *105 atoms per gram of quartz. The maximum age was taken to be theage and terrace erosion rate that corresponded to ~2 m of denudation. This assumptionwas made because of field observations of ~2 m of fine overbank deposit sediments inthe active T2 deposit that were not in the upper deposits, suggesting that these layers hadbeen eroded on the older terraces. The maximum age and terrace erosion rate was 388 kyrand 4.7 m/Myr. The T4 deposit showed mixing in the top three data points which5corresponded to a paler layer in the profile. To date these terraces a new Inventorymethod that took into account both radioactive decay of the isotope as well as allow forthe input of terrace erosion rates to the model. The age was then checked by iteratively solving for the exponential curve using the inheritance derived from the Inventory calculations. The minimum age assuming no surface erosion was 300 � 340 kyr and themaximum age assuming ~2 m denudation was 640 - 1000 kyr.These ages give us a range of incision rates between 17 and 65 m/Myr which arestatistically higher than the range of bare bedrock summit erosion rates in the Blue Ridge(Whitten, 2009) and suggest a net increase in relief in the Shenandoah Valley over 105time scales. The incision rates were also comparable to other Appalachian rivers, whichsuggest disequilibrium across the Central Appalachian landscape. Possible cause of thislandscape disequilibrium include (1) the differential response of the landscape toincreases in the amplitude and frequency of climate fluctuations at the onset of thePleistocene, and (2) isostatic flexural uplift caused by loading on the Atlantic Continental shelf and lightening of the Appalachian Plateau from increased erosion of Atlanticdraining streams." @default.
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• W2234853544 date "2010-05-17" @default.
• W2234853544 modified "2023-09-27" @default.
• W2234853544 title "Using In Situ 10Be Soil Profiles to Date Fluvial Terraces of the South Fork, Shenandoah River, VA" @default.
• W2234853544 hasPublicationYear "2010" @default.
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