Physics
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987e%26psl..81..175e&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 81, no. 2-3, Jan. 1987, p. 175-192. Research supported by John D. Mac
Physics
162
Geochronology, Radioactive Age Determination, Thorium Isotopes, Uranium 234, Uranium 238, Climate, Climate Change, Coral Reefs, Mass Spectroscopy
Scientific paper
A method is presented for the high-precision measurement of the Th-230 abundance in corals by isotope-dilution mass spectrometry using techniques developed by Chen and Wasserburg (1980, 1981) and Chen et al. (1986). It is shown that 6 x 10 to the 8th atoms of Th-230 can be measured to + or - 30 percent (2 sigma) and 2 x 10 to the 10th atoms of Th-230 to + or - 2 percent. The time over which useful age data on corals can be obtained ranges from a few years to about 500 ky, with the uncertainty in age ranging from 5 y for a 180-y-old coral, to 44 y for a 8294-y-old coral, to 1.1 ky for a 123.1-ky-old coral. Ages were determined with high analytical precision for several corals that grew during high sea-level stands about 120 ky ago, supporting the view that the dominant cause of Pleistocene climate change was Milankovitch forcing.
Chen Jacqueline H.
Edwards Lawrence R.
Wasserburg Gerald J.
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