Radiochemical analyses of 210 Pb in a massive coral ( Pavona clavus ) from the Galapagos

Details Radiochemical analyses of 210 Pb in a massive coral ( Pavona clavus ) from the Galapagos Radiochemical analyses of 210 Pb in a massive coral ( Pavona clavus ) from the Galapagos

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.1633d&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 53, Issue 7, pp.1633-1636

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Scientific paper

Radiochemical, mineralogie, and minor element analyses of three Pavona clavus samples spanning 350 years from Urvina Bay, Isabela Island, Galapagos, are presented here. The 210 Pb results, the first reported from corals treated with all the precautions developed for obtaining reliable stable lead measurements, indicate the importance of these procedures for measuring coral 210 Pb activities which can be directly related to surface water activities. Sr/Ca and Mg/Ca ratios, mineralogy, uranium concentration and isotopic ratio data, and activities < 0.2 dpm/100 g for 230 Th (in the two youngest samples) and 232 Th indicate no significant post-depositional alteration or contamination. Calculated initial 210 Pb activities in the two youngest samples are ~6 to 9 dpm/100 g, lower than observed for other Galapagos corals and consistent with surface water conditions inferred from other trace element data on these corals. Initial 226 Ra activities are typically ~4.4 dpm/100 g. Further investigation is required to document fully the effects of cleaning procedures on coral radionuclide measurements and the relationship of variability in coral radionuclides with water column events.

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