Mathematics – Logic
Scientific paper
Aug 1968
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1968gecoa..32..823b&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 32, Issue 8, pp.823-833
Mathematics
Logic
6
Scientific paper
Acid leaching of Middle Ordovician shale under varying conditions reproducibly dissolved a Sr-rich component, probably dolomite, without variable, selective leaching of radiogenic Sr from parent Rb-rich phases. Rb and radiogenic Sr were also leached, in proportions compatible with the geological age of the shale, probably both by their displacement from lattice sites of low bond strength and by the slow dissolution of chlorite. The data are consistent with the occurrence of equilibration of Sr isotopes between the mineral constituents of individual total-rock samples during burial- or very low grade regional-metamorphism, but with at least partial retention of original Sr isotopic differences between total-rocks. They provide a precise measurement of the age of the mineral equilibration event, which is also a minimum age for deposition of the Middle Ordovician. If the Rb 87 decay-constant is taken as 1.47 × 10 -11 /yr, the age agrees well with the estimate of Kulp (1961) for this point of the geological time-scale.
Bofinger V. M.
Compston William
Vernon Michael J.
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