Some aspects on the variations in depositional flux of excess thorium-230 in the central Indian basin during late quaternary

Examined in this paper is the tentative history of the depositional flux of 230Thxs (the unsupported fraction of 230Th scavenged from the overlying water column), for the late quaternary period from a sediment core of the central Indian basin (CIB). The measured depositional flux of 230Thxs is found to be substantially higher than that of the possible theoretical flux from the overlying water column. The average ratio of the measured depositional flux to that of the predicted flux from the overlying water column, indicates that the core site acts as a sink for 230Thxs and based on the existence of bottom current activity; the 230Thxs could be the result of focusing of younger sediments. (author). 29 refs., 2 figs., 2 tabs