Study on dating method of <sup>32</sup>Si in marine sediments

Zhan Xiaoqing; Li Chao; Jia Lei; Zhang Jinpeng; Liu Guangshan

doi:10.3969/j.issn.0253-4193.2019.02.006

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Zhan Xiaoqing, Li Chao, Jia Lei, Zhang Jinpeng, Liu Guangshan. Study on dating method of 32Si in marine sediments[J]. Haiyang Xuebao, 2019, 41(2): 63-74. doi: 10.3969/j.issn.0253-4193.2019.02.006

Citation:

Zhan Xiaoqing, Li Chao, Jia Lei, Zhang Jinpeng, Liu Guangshan. Study on dating method of ³²Si in marine sediments[J]. Haiyang Xuebao, 2019, 41(2): 63-74. doi: 10.3969/j.issn.0253-4193.2019.02.006

Zhan Xiaoqing, Li Chao, Jia Lei, Zhang Jinpeng, Liu Guangshan. Study on dating method of 32Si in marine sediments[J]. Haiyang Xuebao, 2019, 41(2): 63-74. doi: 10.3969/j.issn.0253-4193.2019.02.006

Citation:

Zhan Xiaoqing, Li Chao, Jia Lei, Zhang Jinpeng, Liu Guangshan. Study on dating method of ³²Si in marine sediments[J]. Haiyang Xuebao, 2019, 41(2): 63-74. doi: 10.3969/j.issn.0253-4193.2019.02.006

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Study on dating method of ³²Si in marine sediments

doi: 10.3969/j.issn.0253-4193.2019.02.006

1.
College of Environment & Ecology, Xiamen University, Xiamen 361102, China
2.
College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China
3.
Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou 510075, China

Received Date: 2018-05-30
Rev Recd Date: 2018-10-24

Abstract

Abstract

³²Si generates from the spallation reaction of cosmic rays and argon in atmosphere, which is ingested by siliceous organisms such as diatoms after falling into the lakes and sea from atmosphere. The cosmogenic radioactive isotope ³²Si, with a half-life of approximately 150 a, represents an excellent dating tool for the age range of approximately 100-1 000 a. ³²Si, with a single source and a constant production rate, is of importance to the ancient environments and paleoclimatology. The method of determining ³²Si activity in the marine sediments was established. The main steps were as follows:(1) sample pretreatment; (2) separating and purifying biogenic silica; (3) separating and purifying phosphorus from biogenic silica; (4) preparation of phosphorus and counting ³²P by β counter. The experimental process was monitored by acidic silicomolybdenum blue spectrophotometry and phosphomolybdenum blue spectrophotometry to control loss of silicon and phosphorus during the process. The specific activity of ³²Si in sediments from Nansha sea area varies from 8.39 mBq/kg to 33.34 mBq/kg, with 16.60 mBq/kg as the mean value. The average specific activity of ³²Si in SiO₂ is 0.356 Bq/kg. The average specific abundance of ³²Si in biogenic silica is 1.29×10^-16 (³²Si/SiO₂). Sedimentary rates of sediment cores from deep water (1 335-1 537 m) and shallow water (121-141 m) are 0.106 cm/a and 0.191 cm/a respectively. The average setting flux of ³²Si is 2.14×10^-6 Bq/(cm²·a), within the range of references.
- ³²Si,
- biogenic silica,
- dating,
- Nansha sea area,
- sediment core

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References(30)

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