Increased production of cosmogenic Be-10 during the last glacial maximum

Details Increased production of cosmogenic Be-10 during the last glacial maximum Increased production of cosmogenic Be-10 during the last glacial maximum

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992natur.357..576l&link_type=abstract

Nature (ISSN 0028-0836), vol. 357, no. 6379, June 18, 1992, p. 576-578. Research supported by NSF.

Mathematics

Logic

18

Beryllium 10, Cosmic Rays, Geochronology, Glaciers, Spallation, Geomagnetism, Magnetic Flux, Ocean Bottom, Radioactive Age Determination, Sediments, Solar Activity

Scientific paper

It is reported that the ocean-wide average accumulation rate of Be-10 in Pacific sediments, which reflects the global average production rate of Be-10, was at least 25 percent greater during the height of the most recent ice age than during the Holocene. The higher production rate of Be-10 records the lower intensity of the geomagnetic field during that period and is consistent with the hypothesis developed to explain the younger C-14 ages of fossil corals compared with ages obtained by U-Th dating. These results also point to a more general need to consider variations in production rate in geochronological studies using other cosmogenic nuclides.

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