Geomagnetic field control of C-14 production over the last 80 ky - Implications for the radiocarbon time-scale

Details Geomagnetic field control of C-14 production over the last 80 ky - Implications for the radiocarbon time-scale Geomagnetic field control of C-14 production over the last 80 ky - Implications for the radiocarbon time-scale

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18.1885m&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 18, Oct. 1991, p. 1885-1888. Research supported by CEA, CNRS, and INSU.

Other

48

Carbon 14, Geomagnetism, Magnetic Flux, Radioactive Age Determination, Calibrating, Carbon Cycle, Dipole Moments

Scientific paper

A recent estimate of the geomagnetic dipole field strength over the last 80 ky was used to examine the extent to which changes in geomagnetic field intensity have affected the radiocarbon time scale. The magnetic record was converted into a C-14 production signal which was then used to produce a synthetic atmospheric Delta C-14 record using a two-box model for the carbon cycle. This calibration suggests that the geomagnetic field has been the main factor governing the production of cosmogenic C-14 atoms over the period of time considered, and that Delta C-14 changes due to other causes, such as climatic changes, have been of lesser importance. The results indicate that the radiocarbon ages are 2 to 3 ky younger than true age in the interval 18-40 ky BP, in good agreement with recent U-Th and C-14 age comparisons. Moreover, the results predict that a negligible difference between true and C-14 ages should be observed around 45-50 ky.

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