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Application of long time artificial optical bleaching of the E1’ centre to sediment ESR dating

Chuan-Yi Wei

Chuan-Yi Wei

  • State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake AdministrationBeijing, China
  • School of Earth Sciences, China University of GeosciencesWuhan, China
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Wei, Chuan-Yi
, 
Chun-Ru Liu

Chun-Ru Liu

State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake AdministrationBeijing, China
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Liu, Chun-Ru
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Chang-An Li

Chang-An Li

  • School of Earth Sciences, China University of GeosciencesWuhan, China
  • State Key Laboratory of Biogeology and Environmental GeologyWuhan, China
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Li, Chang-An
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Gong-Ming Yin

Gong-Ming Yin

State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake AdministrationBeijing, China
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Yin, Gong-Ming
, 
Yu-Fen Zhang

Yu-Fen Zhang

Institute of Geophysics and Geomatics, China University of GeosciencesWuhan, China
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Zhang, Yu-Fen
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Wen-Peng Li

Wen-Peng Li

State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake AdministrationBeijing, China
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Li, Wen-Peng
 e 
Lu-Peng Yu

Lu-Peng Yu

Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection School of Resource and Environmental Sciences, Linyi UniversityLinyi, China
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Yu, Lu-Peng
  
17 mag 2019
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Categoria dell'articolo: Regular Articles
Pubblicato online: 17 mag 2019
Pagine: 79 - 86
Ricevuto: 01 ott 2018
Accettato: 18 mar 2019
DOI: https://doi.org/10.1515/geochr-2015-0106
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© 2018 C.-Y. Wei, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Fig. 1

Sketch map showing study area, sampling sites as well as geomorphological and geological setting of sampling sites. a) Study area located on eastern Tibet Plateau and its geomorphological map; b) geological setting and sampling site of Mian’ning River and Diao’tengzi River. Due to that the Mian’ning River is too small to be marked on the map, we represent both of the two sampling sites as one spot in Fig. 1b). The bedrock age data came from China Intrusive Rock Isotope Age Figure by K-Ar dating method.
Sketch map showing study area, sampling sites as well as geomorphological and geological setting of sampling sites. a) Study area located on eastern Tibet Plateau and its geomorphological map; b) geological setting and sampling site of Mian’ning River and Diao’tengzi River. Due to that the Mian’ning River is too small to be marked on the map, we represent both of the two sampling sites as one spot in Fig. 1b). The bedrock age data came from China Intrusive Rock Isotope Age Figure by K-Ar dating method.

Fig. 2

Typical E1’ centre ESR spectrum of quartz in MN05 sample.
Typical E1’ centre ESR spectrum of quartz in MN05 sample.

Fig. 3

Bleaching curve of the E1’ centre of quartz extracted from three storing origins.
Bleaching curve of the E1’ centre of quartz extracted from three storing origins.

Fig. 4

The E1’ signal intensity change level (%) with different light exposure time. The increase level of the E1’ centre is the ratio between increase value of its natural intensity. All sample nature E1’ centre ESR signal intensity are of numerical normalized as 1 (100%). After 400 h, the E1’ centre of three samples show a relatively steady increasing level with a range of 235 ~ 270%, about 2.5 times of its nature.
The E1’ signal intensity change level (%) with different light exposure time. The increase level of the E1’ centre is the ratio between increase value of its natural intensity. All sample nature E1’ centre ESR signal intensity are of numerical normalized as 1 (100%). After 400 h, the E1’ centre of three samples show a relatively steady increasing level with a range of 235 ~ 270%, about 2.5 times of its nature.

Fig. 5

The E1’ centre signal intensity changes with dose irregularly.
The E1’ centre signal intensity changes with dose irregularly.

Each measured point and its bleaching duration_

Measured point No. 1 2 3 4 5 6 7 8 9
Bleaching duration (h) 0 0.5 1.5 2 4 8 16 32 84
Measured point No. 10 11 12 13 14 15 16 17 18
Bleaching duration (h) 102 134 151 184 202 231 260 300 350
Measured point No. 19 20 21 22
Bleaching duration (h) 400 500 700 900

List of sample information used in this study_ All samples were collected from the southeast margin of the Tibet Plateau, which is located in the junction between the first and second ladder of China terrain_ The quartz extracted from bedrock (MN05) was sampled 10 mm beneath its surface; DTZG03 was sampled at 0_7 m beneath the surface deposits; MN06 was collected from the modern floodplain_ MN05 and MN06 were collected from the same river drainage with unitary lithology of granite_

No. Sample name Quartz origin Sample type Latitude (°N) Longitude (°E)
1 MN05 granitic quartz bedrock 28°31’30” 102°03’42”
2 MN06 granitic quartz current fluvial sediment 28°31’30” 102°03’42”
3 DTZG03 granitic quartz Holocene sediment 29°16’01” 102°18’26”
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