The half life of 32Si determined from a varved Gulf of California sediment core

Details The half life of 32Si determined from a varved Gulf of California sediment core The half life of 32Si determined from a varved Gulf of California sediment core

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980e%26psl..48..209d&link_type=abstract

Earth and Planetary Science Letters, Volume 48, Issue 1, p. 209-217.

Physics

4

Scientific paper

Excess 210Pb measurements and varve chronology were used to establish a sediment accumulation rate of 0.19 cm/yr in a 95-cm-long box core raised from the Gulf of California. Varve thickness is unchanged over the entire length of the core, indicating a constant rate of sediment accumulation. The 32Si specific activity of biogenic silica shows an exponential decrease with depth in this core. The half life of 32Si, calculated from these data and the 0.19-cm/yr sediment accumulation rate, is 276 +/- 32 years. As most of the silica and 32Si supplied to the Gulf of California is a result of upwelling of deep ocean water, this half life determination should be relatively insensitive to secular variations in the atmospheric supply of 32Si.
Present address: Department of Marine Science and Engineering, North Carolina State University, Raleigh, NC 27650, U.S.A.

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