10Be chronometry of bedrock-to-soil conversion rates

Details 10Be chronometry of bedrock-to-soil conversion rates 10Be chronometry of bedrock-to-soil conversion rates

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992e%26psl.111..483m&link_type=abstract

Earth and Planetary Science Letters, Volume 111, Issue 2-4, p. 483-492.

Computer Science

13

Scientific paper

We report concentrations of cosmogenic 10Be (t1/2 = 1.5 × 106 yrs) in soil excavated from a soil-mantled hillslope in Black Diamond Mines Regional Park, Contra Costa County, California. The most striking features of the data are: (1) the similarity in the downward decreasing trends of 10Be concentrations in two soil profiles collected 75 m apart, (2) the coincidence in each soil profile of the soil/bedrock interface (as defined by visual inspection of soil pits) and the level at which 10Be concentrations attain very low values ( ~ 4 × 106 atoms/g), and (3) the extremely low 10Be concentrations in the underlying regolith (0.5 × 106 atoms/gram). The inventory of 10Be in these soils is low, equivalent to about 6000 yrs of 10Be accumulation in a soil initially containing no 10Be. On the basis of these measurements, and with the aid of simple models of soil (10Be) motions on the hillslope, we conclude that 10Be loss from the surface is dominated by its removal in soil by creep. We calculate local rates of bedrock-to-soil conversion of between 0.15 and 0.27 km/106 yrs. Comparing these with uplift rates determined for coastal regions of California indicates that soil creep alone is capable of removing soil from the local geomorphic system at a rate equivalent to the rate of uplift of much of the coast.

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