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Coarse versus fine-grain quartz optical dating of the sediments related to the 1985 Ms7.1 Wuqia earthquake, northeastern margin of the Pamir salient, China

Huili Yang
Huili Yang
, 
Jie Chen
Jie Chen
, 
Naomi Porat
Naomi Porat
, 
Tao Li
Tao Li
, 
Wenqiao Li
Wenqiao Li
 y 
Weipeng Xiao
Weipeng Xiao
   | 23 nov 2017
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Publicado en línea: 23 nov 2017
Páginas: 299 - 306
Recibido: 31 ene 2016
Aceptado: 19 may 2017
DOI: https://doi.org/10.1515/geochr-2015-0075
Palabras clave
© 2016 H. Yang.
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Fig. 1

Aster image showing regional tectonic structure, the 1985 Wuqia earthquake surface rupture and trench location. Modified from Li et al. (2012).
Aster image showing regional tectonic structure, the 1985 Wuqia earthquake surface rupture and trench location. Modified from Li et al. (2012).

Fig. 2

Location of the modern sample LED11-7 (Left); Trench wall showing the location of samples LED11-1, 11-2 and 11-6 (Right).
Location of the modern sample LED11-7 (Left); Trench wall showing the location of samples LED11-1, 11-2 and 11-6 (Right).

Fig. 3

Luminescence characteristics. a – Quartz purity IR check; b – Dose recovery as a function of preheat temperature for coarse grains quartz; c – OSL decay curves for single quartz grains from sample LED11-1, the inset shows a corresponding dose response curve (DRC), the red point is recycling point; d – A histogram of dose recovery ratios for single quartz grains using a 10 s preheat at 260°C for and a 220°C cutheat.
Luminescence characteristics. a – Quartz purity IR check; b – Dose recovery as a function of preheat temperature for coarse grains quartz; c – OSL decay curves for single quartz grains from sample LED11-1, the inset shows a corresponding dose response curve (DRC), the red point is recycling point; d – A histogram of dose recovery ratios for single quartz grains using a 10 s preheat at 260°C for and a 220°C cutheat.

Fig. 4

a – Sensitivity-corrected multiple aliquot regenerative-dose growth curve (SMAR) of sample LED11-1; b – OSL decay curves of sample LED11-1; c – A SAR growth curve; d – Coarse grain quartz small aliquot standardized growth curve (SA-DRC). The red diamonds are sample-specific and were projected on the SA-DRC.
a – Sensitivity-corrected multiple aliquot regenerative-dose growth curve (SMAR) of sample LED11-1; b – OSL decay curves of sample LED11-1; c – A SAR growth curve; d – Coarse grain quartz small aliquot standardized growth curve (SA-DRC). The red diamonds are sample-specific and were projected on the SA-DRC.

Fig. 5

Radial plots and KDE plots from single grains (SG) and small aliquot standardised growth curve (SA-SGC) for samples LED11-1, LED11-2 and LED11-6. Grey bands on radial plots show the samples’ De values with 2-sigma error (Table 2). Only KDE plots are shown for the sample LED11-7.
Radial plots and KDE plots from single grains (SG) and small aliquot standardised growth curve (SA-SGC) for samples LED11-1, LED11-2 and LED11-6. Grey bands on radial plots show the samples’ De values with 2-sigma error (Table 2). Only KDE plots are shown for the sample LED11-7.

Dose rate results for the samples.

Sample No.Depth (m)U (ppm)Th (ppm)K (%)Water content

Water contents were estimated at 5 ± 5% or 2 ± 2%

 (%)		Dose rate (Gy/ka)
CQFQ
LED11-12.41.655.31.375 ± 52.1 ± 0.12.9 ± 0.2
LED11-22.81.744.841.155 ± 52.0 ± 0.12.6 ± 0.1
LED11-60.61.967.751.492 ± 22.7 ± 0.23.4 ± 0.2
LED11-70.21.354.671.22 ± 22.1 ± 0.12.5 ± 0.1

De values of single grains, small aliquot SA-SGC and fine grains for the samples shown on Fig 2.

Sample No.Single grainsSmall aliquot SA-SGCFine grains
n/N

n represents the number of accepted single grains or small aliquots that passed the SAR rejection criteria and used for De determination, N represents total number of grains or aliquots measured;

P

Proportion (%) of the grains or aliquots that have a detectable OSL signal;

 (%)		OD

over-dispersion;

 (%)		De

De obtained using the minimum age model.

 (Gy)		Age (ka)n/N

n represents the number of accepted single grains or small aliquots that passed the SAR rejection criteria and used for De determination, N represents total number of grains or aliquots measured;

P

Proportion (%) of the grains or aliquots that have a detectable OSL signal;

 (%)		OD

over-dispersion;

 (%)		De

De obtained using the minimum age model.

 (Gy)		Age (ka)De (Gy)Age (ka)
LED11-1158/48003.34514.3−1.7+1.9$14.3_{-1.7}^{+1.9} $6.7−0.9+1.0$6.7_{-0.9}^{+1.0} $43/78553614.3−3.0+3.3$14.3_{-3.0}^{+3.3} $6.7−1.5+1.6$6.7_{-1.5}^{+1.6} $65.7 ± 5.422.9 ± 1.9
LED11-255/23002.4629.6−1.9+2.5$9.6_{-1.9}^{+2.5} $4.9−1.0+1.3$4.9_{-1.0}^{+1.3} $63/14244599.8−1.8+3.0$9.8_{-1.8}^{+3.0} $5.0−1.0+1.6$5.0_{-1.0}^{+1.6} $157.6 ± 14.360.5 ± 5.4
LED11-655/37001.5455.2−1.0+1.4$5.2_{-1.0}^{+1.4} $2.0−0.4+0.5$2.0_{-0.4}^{+0.5} $52/14440335.4−0.5+1.1$5.4_{-0.5}^{+1.1} $2.0−0.2+0.6$2.0_{-0.2}^{+0.6} $66.8 ± 3.119.5 ± 0.9
LED11-753/18002.9800.2−0.1+0.2$0.2_{-0.1}^{+0.2} $0.1−0.05+0.1$0.1_{-0.05}^{+0.1} $42/8847590.3−0.2+0.3$0.3_{-0.2}^{+0.3} $0.15−0.1+0.15$0.15_{-0.1}^{+0.15} $7.0 ± 0.32.8 ± 0.1
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