Use of oxygen isotope ratios in correlation of tuffs,East Rudolf Basin,northern Kenya |
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| Authors: | Thure E Cerling Donald L Biggs Carl F Vondra Harry J Svec |
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| Institution: | Department of Earth Science, Iowa State University, Ames, Iowa USA;Department of Chemistry, Iowa State University, Ames, Iowa USA |
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| Abstract: | Oxygen isotope determinations were made using CoF3 to extract oxygen from 27 volcanic glass samples from the East Rudolf Basin, northern Kenya. Results show that the older tuffs are progressively enriched in18O and that this index can be used in the correlation of volcanic ash units. This method could not distinguish individual samples from the youngest units studied because their ranges of δ18O overlap. The δ18O values for the shards in the Tulu Bor Tuff, the KBS Tuff, the Koobi Fora Tuff and the Chari Tuff range from 14.5 to 16.4, from 8.9 to 9.5, from 6.6 to 7.0 and from 7.0 to 7.2, respectively, in decreasing age. Determinations from pumice cobbles are consistently higher than the above values. |
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