Ages of barite-sulfide chimneys from the Mariana Trough

Details Ages of barite-sulfide chimneys from the Mariana Trough Ages of barite-sulfide chimneys from the Mariana Trough

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990e%26psl.100..265m&link_type=abstract

Earth and Planetary Science Letters, Volume 100, Issue 1-3, p. 265-274.

Mathematics

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10

Scientific paper

Active and inactive hydrothermal chimneys from the Mariana Trough have young ages ranging from 0.5 to 2.5 years. These estimates are based on disequilibrium between 228Th and 228Ra in barite-rich samples. Mineralogical investigations revealed that the chimneys contain a mixture of barite, galena, sphalerite and chalcopyrite which appear to have formed contemporaneously. Based on radium isotope ratios and Ra/Ba ratios, leaching of freshly exposed basaltic rock must have been the source of the barium found in these deposits.

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