Geomagnetic field modulation of cosmogenic 129I recorded in Chinese loess sequences

IF 3.2 1区地球科学 Q1 GEOGRAPHY, PHYSICAL Quaternary Science Reviews Pub Date : 2024-11-23 DOI:10.1016/j.quascirev.2024.109094

Yukun Fan , Jibao Dong , Zhongyi Liu , Xue Zhao , Yanyun Wang , Xianghui Kong , Qi Liu , Weijian Zhou , Xiaolin Hou

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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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中国黄土序列中记录的宇宙成因 129I 的地磁场调制作用

陆地沉积物中核前碘-129/碘-127（129I/127I）的分散性较大，环境因素复杂，因此陆地 129I 测定极为困难。对可能的影响因素进行分类和解离，有望得出核前 129I/127I 的变化模式，并据此得出陆地年代测定的初始值。在此，我们介绍了中国黄土高原两个黄土-页岩段的碘同位素记录。129I通量与其他古地磁场记录的耦合变化，与已知的古地磁偏移明显吻合，表明古地磁场对宇宙成因129I产生率的显著调控作用，而127I浓度的变化则再次验证了气候的调控作用。129I 通量的振幅与其他古磁场记录的振幅不一致，可能是气候影响和有机质退化的结果。这些发现为我们了解碘同位素组成提供了新的信息，对今后的研究方法具有指导意义。

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来源期刊

Quaternary Science Reviews 地学-地球科学综合

CiteScore

7.50

自引率

15.00%

发文量

388

审稿时长

3 months

期刊介绍： Quaternary Science Reviews caters for all aspects of Quaternary science, and includes, for example, geology, geomorphology, geography, archaeology, soil science, palaeobotany, palaeontology, palaeoclimatology and the full range of applicable dating methods. The dividing line between what constitutes the review paper and one which contains new original data is not easy to establish, so QSR also publishes papers with new data especially if these perform a review function. All the Quaternary sciences are changing rapidly and subject to re-evaluation as the pace of discovery quickens; thus the diverse but comprehensive role of Quaternary Science Reviews keeps readers abreast of the wider issues relating to new developments in the field.