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Journal of Desert Research ›› 2024, Vol. 44 ›› Issue (2): 11-24.DOI: 10.7522/j.issn.1000-694X.2023.00082

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Luminescence dating of Old Red Sand in YancuoJinjiangFujian and its environmental significance

Daiyu Xu(), Jianhui Jin(), Zhizhong Li, Junjie Wei, Chenyang Hou   

  1. Fujian Provincial Key Laboratory of Subtropical Resources and Environment / School of Geographical Sciences,Fujian Normal University,Fuzhou 350117,China
  • Received:2023-03-26 Revised:2023-05-23 Online:2024-03-20 Published:2024-03-19
  • Contact: Jianhui Jin

Abstract:

As one of the important materials of global climate change research, the Old Red Sand can effectively reflect the coastal geomorphological process and climate evolution background since the late Pleistocene. Limited by no reliable dating methods, the formation age and climatic background of Old Red Sand in South China have not been well solved. For that matter, this study selected the section of Yancuo Old Red Sand located in Jinjiang, Fujian Province. In the laboratory, the single aliquot regenerative-dose method of medium-particle quartz was used for luminescence age measurement, and the samples were tested for grain sizes and geochemical elements. The influence of dispersion coefficient and chemical weathering index CIA on the reliability of Old Red Sand dating results was discussed. At the same time, through the statistical analysis of probability density of some reported Old Red Sand age data in South China, the formation of Old Red Sand in South China and its environmental background were discussed. The results showed that: (1) Yancuo profile (YCR) was a typical aeolian sand dune, with good sorting, and the whole was mainly medium sand and fine sand. (2) The sedimentation of Old Red Sand in Yancuo was mainly formed during the period of 132.85-37.22 ka, among which, in the MIS5 and MIS4 stages, the sand dunes may be in the state of activation-deposition-reactivation, and the OSL signal is not well preserved, so it appears the illusion of "sedimentary disconnection". And the MIS3 stage corresponds to the regressive period, the sedimentation rate of aeolian sand is relatively fast, and the weathering degree is strong in the warm and humid climate environment. (3) Affected by sea level change and winter wind intensity, Old Red Sand deposition may occurred in both high sea level and low sea level, but its sedimentation stages are mainly occurred in 80-30 ka, corresponding to MIS4 and MIS3 stages. The sedimentary process of Old Red Sand mainly occurred in the regressive stage, when the sea level is neither high nor low. Too high or too low sea level will affect the provenance range, and then affect the accumulation process of Old Red Sand.

Key words: South China coast, Fujian, Old Red Sand, optically stimulated luminescence

CLC Number: