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0.0124 ±+ 0.003, using negative thermal ionization techniques and fractionation correcting to a 194Pt/ 95pt ratio of 0.9734 (38). An olivine nephelinite from the lower part of a thick alkalic ultrabasic and mafic sequence of volcanic rocks of the northeastern part of the Siberian flood basalt province (SFBP) yielded a 40Ar/39Ar plateau age of 253.3 ± 2.6 million years, distinctly older than the main tholeiitic pulse of the SFBP at 250.0 million years. Olivine phenocrysts of this rock showeddoi:10.1126/science.269.5225.822 pmid:17778742 fatcat:xmk5yoru2zh2tjtqth4tsvtrse