Luminescence dating of Holocene beach-ridge sands on the Yumigahama Peninsula, western Japan Cover

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Luminescence dating of Holocene beach-ridge sands on the Yumigahama Peninsula, western Japan

Geochronometria

Volume 44 (2017): Issue 1 (January 2017)

By: Toru Tamura, Kazumi Ito, Takahiko Inoue and Tetsuya Sakai

Open Access

|Dec 2017

Figures & Tables

(A) Regional map showing location of the Yumigahama Peninsula. (B) Simplified geological map of the Hino River catchment (after Inoue et al., 2004). (C) Landform classification map of the Yumigahama Peninsula showing boundaries (dotted red lines) between the Uchihama, Nakahama, and Sotohama ranges (after Sadakata, 1991). Distinction between granitic and volcanic sands is based on mineral analyses by Sadakata (1991). The 1926 shoreline is after Inoue et al. (2004)

Example of the GPR data we acquired (transect location in Fig. 1C). The GPR survey was undertaken using a PulseEkko PRO GPR system (Sensors & Software Inc., Ontario, Canada) with bistatic, shielded 250-MHz antennae. Pulsed radar waves were automatically generated at a step size of 0.05 m, and their reflections were recorded. The GPR data were processed with Reflexw software (Sandmeier Scientific Software, Karlsruhe, Germany). Data processing included dewow filtering, zero-time correction, time-depth conversion, and static correction. The radar wave velocity was calculated by the common midpoint method at several points along transect. T.P. (Tokyo Peil) is the standard datum for elevation measurements in Japan. T.P. = 0 is mean sea level in Tokyo Bay.

LM-OSL curves of (A) calibration quartz and (B) quartz samples YG-1 to YG-8. (C) Fitting of LM-OSL curve of quartz sample YG-7. (D) Results of the preheat dose recovery test for quartz sample YG-7.

Luminescence decay cuives and dose-response curves (insets) for K-feldspar samples (A) YG-1 and (B) YG-7 based on SAR protocols summarized in Table 2. (C) Results of preheat dose recovery test for IRSL of K-feldspar sample YG-1. pIRIR means post-IR IRSL.

Fading test for K-feldspar samples (A) YG-1, (B) YG-4, (C) YG-6, and (D) YG-7. pIRIR means post-IR IRSL

Comparison of corrected and uncorrected IRSL ages and uncorrected post-IR IRSL (pIRIR) ages with the initial stage of beach-ridge formation (shaded light gray) inferred from the Holocene sea-level curve for the Japan Sea coast of western Japan (Tanigawa et al, 2013) and an age inferred from Nishinada Ruin (Sasaki et al, 2011) (Fig. 1C). T.P. (Tokyo Peil) is the standard datum for elevation measurements in Japan. T.P. = 0 is mean sea level in Tokyo Bay.

Corrected and uncorrected IRSL ages and uncorrected post-IR IRSL (pIRIR) ages of samples plotted against distance landward from the 1926 shoreline (after Inoue et al, 2004). Inset is an enlargement of the area shaded grey.

Dose recovery ratio, equivalent dose (De), g-value, and luminescence age estimates for IRSL and post-IR IRSL (pIRIR) signals for all samples_

Sample	IRSL₅₀					pIRIR₁₅₀

	Dose recovery ratio	D_e (Gy)	g-value (%/decade)	Uncorrected age (ka)	Corrected age (ka)	Dose recovery ratio	D_e (Gy)	g-value (%/decade)	Uncorrected age (ka)
YG-1	0.90 ± 0.02	7.0 ± 0.3	11.3 ± 0.7	2.9 ± 0.2	8.1 ± 1.3	0.97 ± 0.03	12.5 ± 0.4	−4.7 ± 0.7	5.1 ± 0.3

YG-2	0.99 ± 0.03	5.2 ± 0.1	11.0 ± 0.8	2.0 ± 0.1	5.2 ± 0.9	0.98 ± 0.02	8.6 ± 0.2	−6.6 ± 0.7	3.3 ± 0.1

YG-3	0.94 ± 0.04	3.3 ± 0.3	11.5 ± 0.7	1.4 ± 0.2	3.7 ± 0.7	0.96 ± 0.02	6.0 ± 0.3	−5.7 ± 1.1	2.5 ± 0.2

YG-4	1.03 ± 0.05	3.1 ± 0.2	12.8 ± 0.8	1.2 ± 0.1	3.7 ± 0.5	1.00 ± 0.06	5.2 ± 0.3	−6.8 ± 1.0	1.9 ± 0.2

YG-5	0.98 ± 0.06	1.5 ± 0.04	11.1 ± 1.1	0.61 ± 0.04	1.4 ± 0.2	0.98 ± 0.09	2.8 ± 0.1	−6.6 ± 1.0	1.1 ± 0.1

YG-6	1.03 ± 0.10	0.91 ± 0.02	12.7 ± 0.9	0.33 ± 0.02	0.83 ± 0.10	1.02 ± 0.11	2.0 ± 0.2	−7.6 ± 0.7	0.73 ± 0.08

YG-7	0.99 ± 0.05	0.81 ± 0.02	12.0 ± 0.7	0.18 ± 0.01	0.39 ± 0.04	1.01 ± 0.11	2.4 ± 0.1	−6.3 ± 0.6	0.55 ± 0.04

YG-8	0.99 ± 0.05	0.55 ± 0.01	12.6 ± 0.8	0.12 ± 0.01	0.25 ± 0.02	0.97 ± 0.05	2.1 ± 0.1	−6.6 ± 0.7	0.45 ± 0.03

Summaries of IRSL and post-IR IRSL SAR protocols used in this study_

Step	IRSL₅₀	Post-IR IRSL₁₅₀
1	Preheat at 180°C for 60 s	Preheat at 180°C for 60 s

2	IR stimulation at 50°C for 100 s	IR stimulation at 50°C for 100 s

3	Test dose	IR stimulation at 150°C for 100 s

4	Preheat at 180°C for 60 s	Test dose

5	IR stimulation at 50°C for 100 s	Preheat at 180°C for 60 s

6	IR stimulation at 185°C for 100 s	IR stimulation at 50°C for 100 s

7	Dose and return to step 1	IR stimulation at 150°C for 100 s

8		IR stimulation at 185°C for 100 s

9		Dose and return to step 1

Details of sample sites, radionuclide and water contents of samples, and estimated dose rates_

Sample	Distance from shoreline (km)	Surface elevation (m T.P. T.P. (Tokyo Peil) is the standard datum for elevation measurements in Japan. )	Depth (m)	Water content (%)	K (%)	Rb (ppm)	Th (ppm)	U (ppm)	Dose rate (Gy/ka)
YG-1	3.25	+2.97	1.80–1.95	28	1.3	50	6.0	1.1	2.45 ± 0.14

YG-2	2.35	+3.51	1.35–1.50	31	1.7	67	4.6	1.0	2.57 ± 0.15

YG-3	1.79	+2.75	0.90–1.05	32	1.4	54	4.0	1.1	2.37 ± 0.14

YG-4	1.44	+2.80	0.95–1.10	28	1.8	69	4.3	1.2	2.69 ± 0.15

YG-5	0.94	+4.14	1.40–1.55	32	1.6	55	4.1	1.0	2.46 ± 0.14

YG-6	0.58	+3.34	1.70–1.85	26	1.9	77	4.0	1.0	2.75 ± 0.15

YG-7	0.25	+2.62	1.15–1.30	6	3.3	149	3.2	1.0	4.39 ± 0.23

YG-8	0.03	+2.89	1.65–1.95	5	3.5	163	3.8	0.9	4.66 ± 0.25

DOI: https://doi.org/10.1515/geochr-2015-0076 | Journal eISSN: 1897-1695

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Language: English

Page range: 331 - 340

Submitted on: Feb 13, 2016

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Accepted on: Sep 8, 2017

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Published on: Dec 29, 2017

Published by: Sciendo

In partnership with: Paradigm Publishing Services

Publication frequency: 1 issue per year

Keywords:

anomalous fading,

Related subjects:

Geosciences, other

© 2017 Toru Tamura, Kazumi Ito, Takahiko Inoue, Tetsuya Sakai, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Volume 44 (2017): Issue 1 (January 2017)