Computer Science
Scientific paper
Feb 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974gecoa..38..235s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 38, Issue 2, pp.235-244
Computer Science
1
Scientific paper
The Rb---Sr age dating method has been applied to a sequence of Carboniferous shales for which some geochemical information was already available. In the marine shales, the Rb/Sr ratio is higher than in the non-marine and brackish water shales. Although the range of values can be attributed to depositional processes, the range of Rb/Sr values is too small to give a depositional isochron, and thus the age of deposition can not be determined. If samples with a variable mineralogy had been selected for the isotope study, the range of Rb/Sr could have been extended. Only by chance, however, would the depositional age have been obtained. A comparison of the Rb---Sr isotope values in the Carboniferous shales with those in probable source rocks shows that a reduction in the Sr 87 /Sr 86 ratio relative to the Rb 87 /Sr 86 ratio may have taken place. Such a reduction could have occurred on the Carboniferous land-mass during the formation of the clay minerals.
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