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Records of cosmogenic radionuclides Be, Al and Cl in corals: First studies on coral erosion rates and potential of dating very old corals |
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| Authors: | Devendra Lal Christina D Gallup Loïc Vacher Anthony JT Jull Robert C Speed Amos Winter |
| Institution: | 1 Scripps Institution of Oceanography, Geosciences Research Division, La Jolla, CA 92093, USA 2 Department of Geological Sciences and Large Lakes Observatory, University of Minnesota Duluth, *Duluth, MN 55812, USA 3 Physical Research Laboratory, Navrangpura, Ahmedabad, 380 009, India 4 PRIME Lab, Purdue University, 525 Northwestern Avenue, West Lafayette, IN 47907-2036, USA 5 NSF Arizona Accelerator Mass Spectrometer Laboratory, Department of Geosciences, University of Arizona, Tucson, AZ 85721, USA 6 Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA 7 Department of Earth System Science, University of California, Irvine, CA 92697, USA 8 Department of Marine Sciences, University of Puerto Rico, Mayaguez, 00680, Puerto Rico |
| Abstract: | We present results of measurements of cosmogenic 10Be, 26Al and 36Cl, and the indigenous (intrinsic) concentrations of the stable elements Be, Al and Cl in 120-200 kyr old corals from Barbados and Puerto Rico. The concentration levels of these radionuclides in the corals lie in the range 104 to 108 atoms/g. A comparison of the measured nuclide concentrations with those expected to be produced in the corals by nuclear interactions of energetic cosmic radiation shows that (i) the radionuclides 26Al and 36Cl are derived from in situ cosmic ray interactions in the corals after their formation, but that (ii) the radionuclide 10Be owes its provenance in the coralline lattice primarily due to incorporation of dissolved beryllium in seawater in the lattice structure of the corals. |
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