Leaching procedure used in dating young potassic volcanic rocks by the 226Ra/(230Th) method

Details Leaching procedure used in dating young potassic volcanic rocks by the 226Ra/(230Th) method Leaching procedure used in dating young potassic volcanic rocks by the 226Ra/(230Th) method

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995e%26psl.136..123v&link_type=abstract

Earth and Planetary Science Letters, vol. 136, Issue 3-4, pp.123-131

Physics

4

Scientific paper

A method for determining the ages of shoshonitic volcanics erupted within the last 5000 years is presented and assessed. This method is based on 226 Ra/ 230 Th radioactive disequilibrium and on a leaching procedure and -counting of volcanics containing Th-enriched, Ra initial -depleted mineral phases detected by microprobe analyses. K is used as a Ra-stable chemical analogue. The data are plotted on ( 226 Ra / 228 Ra )- K /( 228 Ra ) Osmond-type diagrams in order to evaluate the 226 Ra radiogenic / 230 Th activity ratio of the Th-enriched, Ra initial -depleted phases. Four samples of volcanics from Vulcano Island (southern Italy) gave ages consistent with historical reports and K/Ar chronology.

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