何乐龙,江云水,贺行良,等. 利用光释光和230Th、231Pa等放射性同位素对深海沉积物的年代测定[J]. 海洋地质前沿,2022,38(4):80-84. DOI: 10.16028/j.1009-2722.2020.159
    引用本文: 何乐龙,江云水,贺行良,等. 利用光释光和230Th、231Pa等放射性同位素对深海沉积物的年代测定[J]. 海洋地质前沿,2022,38(4):80-84. DOI: 10.16028/j.1009-2722.2020.159
    HE Lelong, JIANG Yunshui, HE Xingliang, et al. Dating deep sea sediments by means of optically stimulated luminescence and 230Th, 231Pa radionuclides[J]. Marine Geology Frontiers, 2022, 38(4): 80-84. DOI: 10.16028/j.1009-2722.2020.159
    Citation: HE Lelong, JIANG Yunshui, HE Xingliang, et al. Dating deep sea sediments by means of optically stimulated luminescence and 230Th, 231Pa radionuclides[J]. Marine Geology Frontiers, 2022, 38(4): 80-84. DOI: 10.16028/j.1009-2722.2020.159

    利用光释光和230Th、231Pa等放射性同位素对深海沉积物的年代测定

    Dating deep sea sediments by means of optically stimulated luminescence and 230Th, 231Pa radionuclides

    • 摘要: 对2组来自孟加拉湾的深海钻孔柱样进行光释光(OSL)测年的放射性分析时发现,所测深海样品具有较高的230Th、231Pa等放射性核素活度浓度。利用230Thex231Paex231Paex/230Thex等参数计算柱样沉积速率,发现3种计算方式得到的结果较为一致。其中,C3钻孔的平均沉积速率介于16.2~18.2 cm/ka,CB2钻孔的平均沉积速率介于10.3~12.3 cm/ka。和光释光所得的年代数据相比,其平均值相互吻合。光释光的年代数据表明,这2组柱样可能经历了沉积速率加快的沉积过程。

       

      Abstract: When the two groups of deep-sea samples taking from the Bay of Bengal were analyzed for OSL dating, we found that the samples are high in 230Th, 231Pa radionuclides levels. After calculating the sedimentation rate of the samples with 230thex, 231paex and 231paex / 230thex, it is found that the results obtained by the three methods are quite consistent. The average sedimentation rate of C3 is between 16.2 and 18.2 cm/ka and that of CB2 changes between 10.3 and 12.3 cm/ka. Compared with the OSL dating data, the average of the sedimentation rate values is consistent. The OSL dating suggest that the two groups of samples may have experienced a process of sedimentation rate acceleration.

       

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