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Testing the standardized growth curve (SGC) to OSL dating coastal sediments from the south Bohai Sea, China |
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| Authors: | Guang-Quan Chen Liang Yi Xing-Yong Xu Hong-Jun Yu Jian-Rong Cao Qiao Su Lin-Hai Yang Yong-Hang Xu Jun-Yi Ge Zhong-Ping Lai |
| Institution: | 1103. State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, 200062, China 2103. Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, State Oceanic Administration, Qingdao, 266061, China 3103. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China 5103. College of Environment and Planning, Liaocheng University, Liaocheng, 252059, China 4103. State Key Laboratory of Cryosphere Sciences, Cold and Arid Regions Environment and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, 730000, China 6103. Open Laboratory of Ocean & Coast Environmental Geology, Third Institute of Oceanography, State Oceanic Administration, Xiamen, 361005, China 7103. The Laboratory of Human Evolution, Institute of Vertebrate Palaeontology and Palaeoanthropology, Chinese Academy of Sciences, Beijing, 100044, China |
| Abstract: | It has been suggested that the standardized growth curve (SGC) method can be used to accurately determinate equivalent dose (De) and reduce measurement time. However, different opinions regarding the applicability of the SGC method exist. In this paper, we evaluated quartz OSL SGCs of marine and coastal sediments of different grain sizes and different cores in the south Bohai Sea in China, and tested their applicability to the determination of De values. Our results suggested as follows: (1) The SGC method is applicable to both multiple- and single-aliquot regenerative-dose (MAR and SAR) protocols of OSL dating and efficiently provides reliable estimates of De. (2) Finesand quartz of different palaeodoses showed highly similar dose-response curves and an SGC was developed, but old samples using the SGC method have large uncertainties. (3) For coarse-silt quartz, two different types of dose-response curves were recorded: low-dose (≤60Gy) and high-dose (≥100Gy). The growth curves of low-dose quartz were similar to each other, facilitating the use of SGC in De estimations, but errors tended to be larger than those obtained in the SAR method. For high-dose (100–300Gy) quartz, the SGC was also found to be reliable, but there was large uncertainty in De (>300Gy) estimation. We suggest that SGC could be employed for the dating of marine and coastal sediments dating using either MAR or SAR OSL protocol and either fine-silt, coarse-silt or fine-sand quartz. |
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