Mathematics – Logic
Scientific paper
Jul 1961
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1961gecoa..24..226c&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 24, Issue 3-4, pp.226-230
Mathematics
Logic
3
Scientific paper
The uranium and lead concentration and isotopic composition in a variety of samples of kolm and associated black shale from the Peltura beds (Franconian stage) of the Upper Cambrian of Sweden have been determined by isotope dilution techniques. In addition Th 230 , Ra 226 , Pb 210 and radon leakage values have been determined on certain samples. All samples show discordant U-Pb isotopic ages. It appears that two processes have been at work; selective removal of Pb 206 , resulting from the movement of an intermediate member of the U 238 -Pb 206 series, and removal of bulk radiogenic lead. The absolute age of the formation is concluded to be greater than 500 million years with the most probable age near this lower limit. This is in good agreement with the latest results on the absolute geologic time scale. The stratigraphically well-dated kolm cannot, however, be considered a calibration point in the absolute time scale. It does show that uranium-lead dating on bituminous shales will lead to minimum ages for these formations.
Cobb James C.
Kulp Laurence J.
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