Abstract
The larger dispersion of pre-nuclear Iodine-129/Iodine-127 (129I/127I) in terrestrial sediments and the complexity of environmental factors made terrestrial 129I dating extremely difficult. Sorting and dissociating possible influences will hopefully lead to a pattern of change in the pre-nuclear 129I/127I and accordingly an initial value for terrestrial dating. Here, we present the iodine isotope records of two loess-paleosol sections from Chinese Loess Plateau. The coupled variations of the 129I fluxes and other paleomagnetic field records, with known paleomagnetic excursions being clearly matched, indicated the prominent modulation of cosmogenic 129I production rate by paleomagnetic field, while the variation of 127I concentrations again verified the climate control. Discrepancies in amplitudes of 129I fluxes and other paleomagnetic field records were supposed to be a result of possible climate impact and organic matter degradation. These findings add new information to our knowledge of iodine-isotope composition, and are instructive for future study methodology.
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