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Pre-nuclear values for 129I/127I in Chinese sediments and their geochronological implications
Palaeogeography, Palaeoclimatology, Palaeoecology ( IF 2.6 ) Pub Date : 2021-02-23 , DOI: 10.1016/j.palaeo.2021.110312
Yukun Fan , Li Zhang , Jianghu Lan , Xiaolin Hou , Weijian Zhou

Large variations in pre-nuclear 129I/127I ratios in terrestrial environments have been observed, but few investigations have been carried out on how the isotopic composition varies and how it is affected by the terrestrial environment. In this work, lake and river sediments were studied for the first time with the aim of exploring the possible connections between the natural iodine isotopic composition and its sources. The observed higher natural 129I/127I ratios compared to those in the marine system suggested that the isotopes did not reach a steady state. Decreasing 129I/127I ratios with increasing 127I contents indicated perturbation of old iodine, and a narrower range of initial equilibrium ratios was suggested based on pre-nuclear ratios derived in the studied sediments.

更新日期:2021-02-28
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