Physics
Scientific paper
Jun 1967
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967gecoa..31.1079m&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 31, Issue 6, pp.1079-1089
Physics
8
Scientific paper
We present K-Ar ages for thirty-five basalt and diabase core samples, from drillings by Petrobrás (Petróleo Brasileiro S.A.) in the Paraná Basin. With one exception, where we separated and dated plagioclase from a coarser basalt, all samples were fine grained and wore dated by the whole-rock method. Microscopic examination, carried out in all cases prior to making the age determinations, showed that the core samples were essentially unaltered by weathering. The ages reported are susceptible to possible analytical error of about 2%. The results confirm ages for the Southern Brazil basaltic volcanism, previously reported from this laboratory but based principally upon surface samples. A histogram of the new ages shows a maximum near 130 m.y. Ages obtained for samples taken at different depths from the same drill hole did not show significant variations in age between successive lava flows, leading to the conclusion that in the same region, the lava flows were practically contemporaneous. However, significant variations in age, thought to be real, are found for different localities.
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