Physics
Scientific paper
Nov 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996gecoa..60.4313p&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 60, Issue 22, pp.4313-4319
Physics
4
Scientific paper
In recently formed marine barite (BaSO 4 ) separated from two equatorial Pacific cores 226 Ra activity exceeds that of its parent 230 Th by at least an order of magnitude, indicating radium uptake during barite precipitation. The decay of 226 Ra with depth, in these samples, is exponential implying that no radium exchange with porewaters occurs after burial. Thus, barite behaves as a closed system below the sediment mixed layer. The absence of 226 Ra exs activity in barite samples older than ~8000 years, the lack of any detectable 228 Th, 228 Ra, and 224 Ra in any of the barite samples analyzed, and the unaltered crystal size and habit with depth in the sediment, further support this conclusion. Hence, assuming that oceanic Ra/Ba ratio has not changed throughout the Holocene, the decay of unsupported 226 Ra permits dating of marine barite and estimating sedimentation rates. Holocene sedimentation rates calculated using the decay of 226 Ra exs in barite are consistent with 14 C and 18 O derived sedimentation rates of 2-3 cm/kyr for the same cores. The method could be extendible to carbonate-poor Holocene sediments.
Kastner Michael
Moore Willard S.
Paytan Adina
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