Calibrating a long-term meteoric 10Be accumulation rate in soil

Details Calibrating a long-term meteoric 10Be accumulation rate in soil Calibrating a long-term meteoric 10Be accumulation rate in soil

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3719403r&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 19, CiteID L19403

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2

Geochronology: Quaternary Geochronology, Geochronology: Radioisotope Geochronology

Scientific paper

Using 13 samples collected from a 4.1 meter profile in a well-dated and stable New Zealand fluvial terrace, we present the first long-term accumulation rate for meteoric 10Be in soil (1.68 to 1.72 × 106 at/(cm2·yr)) integrated over the past ˜18 ka. Site-specific accumulation data, such as these, are prerequisite to the application of meteoric 10Be in surface process studies. Our data begin the process of calibrating long-term meteoric 10Be delivery rates across latitude and precipitation gradients. Our integrated rate is lower than contemporary meteoric 10Be fluxes measured in New Zealand rainfall, suggesting that long-term average precipitation, dust flux, or both, at this site were less than modern values. With accurately calibrated long-term delivery rates, such as this, meteoric 10Be will be a powerful tool for studying rates of landscape change in environments where other cosmogenic nuclides, such as in situ 10Be, cannot be used.

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