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230TH/U dating of massive sulfides from the logatchev and rainbow hydrothermal fields (Mid-Atlantic Ridge)

Kuznetsov V., Cherkashev G., Lein A., Shilov V., Maksimov F., Arslanov K., Stepanova T., Baranova N., Chernov S., Tarasenko D.

Geochronometria

2006

Vol. 25

51-55

A radiochemical study was carried out on massive sulfides from three hydrothermal fields in the Mid-Atlantic Ridge. The main objective was to check whether 230Th/U dating yields reliable results. The absolute 230Th/U ages of massive sulfide samples of three hydrothermal fields at the Mid Atlantic Ridge were determined 58.2±4.2 ka and 16.8±1.0 ka for the "Logatchev-1" site, 3.9±0.4 ka for the "Logatchev-2" site and 23.0±1.5 ka, 3.9±0.6 ka and 2.2±0.3 ka for the "Rainbow" site. The dates correspond to the activation periods of hydrothermal ore formation systems.