Post-IR IRSL dating of K-feldspar from last interglacial marine terrace deposits on the Kamikita coastal plain, northeastern Japan

Kazumi Ito; Toru Tamura; Sumiko Tsukamoto

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Post-IR IRSL dating of K-feldspar from last interglacial marine terrace deposits on the Kamikita coastal plain, northeastern Japan

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| Dec 29, 2017

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

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Page range: 352 - 365

Received: Dec 26, 2016

Accepted: Sep 08, 2017

DOI: https://doi.org/10.1515/geochr-2015-0077

Keywords
post-IR IRSL dating, K-rich feldspar, fading correction, marine terrace, MIS 5e

© 2016 K. Ito.

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

(a) Location map of the Kamikita coastal plain, northeastern Japan. (b) Map showing the distribution of Late and Middle Pleistocene marine terraces and sampling sites (after Miyauchi, 1985, 1987). In the legend, surface is abbreviated a “S” The elevation range of each terrace is given in the text. (c) Digital elevation model of the Kamikita coastal plain based on 10-m-grid data from the Geospatial Information Authority of Japan. Lighter grays indicate lower elevations, and darker grays and black indicate higher elevations.

Columnar sections from sites 1 and 2. Grain size is categorized into clay, silt, very fine sand, fine sand, medium sand, coarse sand, very coarse sand, granules, and pebbles (C, Si, vfs, fs, ms, cs, vcs, G, and P, respectively). The bold horizontal line represents the erosional surface between the terrestrial and subtidal facies deposits. T.P. (Tokyo Peil) is the standard datum for elevation measurements in Japan.

pIRIR signal characteristics of samples gsj13-039 and gsj13-094 with different first IR stimulation temperatures. The pIRIR stimulation and preheat temperatures were fixed at 290 and 320°C, respectively. (a) Typical signal intensities of pIRIR290 signals from sample gsjl3-039, (b) first IR stimulation temperature plateau, and (c) dose recovery ratio and residual dose after bleaching for 3 h with different first stimulation temperatures. The error bars show one standard error. In (b), the bold and dashed lines represent the average De of each sample, except for De at the first IR measurement temperature of 250°C for gsj13-039. In (c), the dashed lines represent the ±10% range.

Fading test results. (a) Typical results for sample gsj13-039; (b) g-values obtained with different first IR stimulation temperatures for gsj13-039 and gsj13-094. The error bars show one standard error.

Average residual dose obtained for different artificial sunlight bleaching times. Each data point represents the average of at least six aliquots. The error bars show one standard error.

(a) Uncorrected and (b) corrected pIRIR ages of gsj13-039 and gsj13-094 obtained with different first IR stimulation temperatures. The error bars show one standard error.

Columnar sections as in Fig. 2. For sites 1 and 2, the fading-uncorrected and -corrected ages of the PIRIR50/290 and PIRIR200/290 signals are shown with one standard error. For site 2, the fading corrected ages of PIRIR200/290 signals were not calculated because the average ρ’ value was lower than zero. For each site, the vertical gray bar shows the expected age range. T.P. (Tokyo Peil) is the standard datum for elevation measurements in Japan.

Typical dose–response curve for the PIRIR50/290 and PIRIR200/290 signals of sample gsj13-039.

Results of pIRIR dating using different first IR stimulation temperatures. n is number of aliquots, ρ′ is the dimensionless recombination center density (Huntley, 2006). Residual dose was De after artificial sunlight bleaching for 3 h except for modern beach sand (gsj14-019) which was bleached for 800 h. Fading correction was performed based on Kars et al. (2008) and Kars and Wallinga (2009). To calculate the uncorrected ages, residual dose of modern beach sand (gsj14-019) was subtracted from De of each sample. D0 values were calculated based on Wintle and Murray (2006).aTerrigenous sediments. bIf the average g-value of samples from site 2 was lower than zero, fading correction would not performed.

Sample	Measurement procedure	n	D_e(Gy)	Fading test			Dose recovery test				Fading-uncorrected Age (ka)	Fading-corrected Age^b (ka)	D₀ (Gy)

				n	g_2days (%/decade)	ρ′ /10⁻⁶	n	Dose recovery ratio	n	Residual dose (Gy)
Site 1

gsj13-040^a	pIRIR_50/290	11	96 ± 3	11	2.19 ±0.09	2.24 ±0.10	3	0.93 ± 0.09	3	10± 1	59 ± 5	95 ±9	361
gsj13-040^a	pIRIR_200/290	17	120 ± 4	7	−1.02 ±0.73	−1.11 ±0.72	3	1.07 ± 0.09	3	12 ± 6	74 ± 7	81 ±8	251

gsj14-014	pIRIR_50/290	8	163 ± 8				3	1.16 ± 0.05	3	15 ± 1	99 ± 11	167 ±20	413
gsj14-014	pIRIR_200/290	11	192 ± 5				3	1.20 ± 0.10	3	25 ± 1	116± 10	127 ± 12	324

gsj14-015	pIRIR_50/290	8	178 ± 8				3	1.06 ± 0.03	3	12 ± 0	105 ± 10	168 ± 16	724
gsj14-015	pIRIR_200/290	8	181 ± 6				3	0.81 ± 0.05	3	22 ± 1	106 ± 10	116 ± 11	392

gsj13-039	pIRIR_50/290	28	176 ± 8	28	1.65 ±0.18	1.64 ±0.17	10	1.03 ± 0.10	6	15 ± 0	103 ± 10	177 ±20	422
	pIRIR_100/290	12	191 ± 10	12	2.22 ± 0.34	2.22 ± 0.33	9	1.10 ± 0.12	6	18 ± 2	112 ± 12	199 ±25	424
	pIRIRI_50/290	10	200 ±7	10	1.65 ±0.31	1.64 ±0.31	9	1.06 ± 0.12	6	23 ± 2	118 ± 11	178 ± 17	451
	pIRIR_200/290	19	183 ± 14	19	0.49 ± 0.46	0.48 ± 0.49	12	1.02 ± 0.11	12	27 ± 2	107 ± 15	117 ± 17	370
	pIRIR_250/290	9	238 ± 8	9	−0.26 ± 1.07	−0.42 ± 1.15	9	1.08 ± 0.40	6	28 ± 7	139 ± 15	139 ± 15	231

gsj14-031	pIRIR_50/290	7	163 ± 7				3	1.06 ± 0.05	3	13± 1	94 ± 9	159 ± 16	410
gsj14-031	pIRIR_200/290	9	194 ± 7				3	1.01 ± 0.07	3	25 ± 1	112 ± 12	123 ± 13	298

gsj14-030	pIRIR_50/290	8	204 ± 5	8	2.53 ± 0.31	2.53 ± 0.32	3	1.04 ± 0.05	3	15 ± 0	116± 9	199 ± 17	448
gsj14-030	pIRIR_200/290	13	214 ± 7	12	1.57 ±0.40	1.57 ±0.40	3	0.94 ± 0.17	3	31 ± 1	120 ± 12	133 ± 14	258

gsj14-017	pIRIR_50/290	8	184 ± 5				3	1.04 ± 0.05	3	16± 1	113± 9	188 ± 16	514
gsj14-017	pIRIR_200/290	11	204 ± 11				3	1.02 ± 0.07	3	31 ± 1	125 ± 14	136 ± 15	446

gsj14-029	pIRIR_50/290	8	183 ± 5				3	0.96 ± 0.04	3	14 ± 1	107 ± 9	181 ± 15	453
gsj14-029	pIRIR_200/290	10	206 ± 9				3	1.01 ± 0.10	3	21 ± 1	120 ± 13	131 ± 15	339

Site 2

gsj13-093^a	pIRIR_50/290	10	95 ± 2	10	1.25 ±0.66	1.21 ±0.66	3	1.09 ± 0.05	3	11 ± 0	64 ± 5	94 ±8	371
gsj13-093^a	pIRIR_200/290	16	127 ± 4	8	−1.34 ±0.57	−1.43 ±0.62	3	1.13 ± 0.10	3	21 ± 2	86 ± 8		229

gsj13-094	pIRIR_50/290	17	163 ± 6	11	2.21 ± 0.42	2.24 ± 0.40	3	1.16 ± 0.07	3	19 ± 1	114 ± 10	173 ± 16	461
	pIRIR_100/290	6	203 ± 7	6	0.55 ±0.14	0.58 ±0.15	3	1.11 ± 0.05	3	18 ± 1	142 ± 13	164 ± 16	420
	pIRIR_50/290	6	210 ± 4	6	1.50 ±0.23	1.52 ±0.25	3	0.98 ± 0.09	3	20 ± 1	147 ± 12	223 ± 18	364
	pIRIR_200/290	24	193 ± 7	12	−0.11 ±0.74	−0.20 ± 0.76	3	1.02 ± 0.07	3	31 ± 1	134 ± 14		324
	pIRIR_250/290	4	221 ± 14	4	0.81 ± 0.57	0.83 ± 0.59	3	0.65 ± 0.07	3	38 ± 3	154 ± 27	202 ± 41	253

gsj13-092	pIRIR_50/290	7	205 ± 5				3	1.08 ± 0.06	3	17 ± 0	126 ± 10	193 ± 16	507
gsj13-092	pIRIR_200/290	10	219 ± 3				3	1.02 ± 0.07	3	31 ± 1	134 ± 10		287

gsj13-095	pIRIR_50/290	8	193 ± 5	8	1.82 ±0.12	1.82 ±0.13	3	1.16 ± 0.07	3	12 ± 0	121 ± 10	187 ± 16	450
gsj13-095	pIRIR_200/290	16	214 ± 4	12	1.40 ±0.22	1.40 ±0.23	3	0.97 ± 0.06	3	28 ± 1	134 ± 11		354

gsj13-091	pIRIR_50/290	8	178 ± 3				3	1.07 ± 0.06	3	16± 1	118 ± 9	178 ± 14	532
gsj13-091	pIRIR_200/290	11	205 ± 5				3	1.13 ± 0.12	3	32 ± 2	136 ± 12		312

gsj13-096	pIRIR_50/290	8	187 ± 13				3	1.06 ± 0.06	3	11 ± 1	115 ± 15	177 ±26	442
gsj13-096	pIRIR_200/290	12	202 ±7				3	1.15 ± 0.06	3	27 ± 1	123 ± 12		339

Site 3

gsj14-019	pIRIR_50/290	12	16± 2						3	3 ± 0
	pIRIR_100/290	8	14 ± 2
	pIRlR_50/290	8	11 ± 1
	pIRIR_200/290	15	17 ± 1						3	4 ± 0
	pIRIR_250/290	8	26 ± 2

Single aliquot regenerative (SAR) protocol used for De measurements.

Step	Measurement Protocol
1	Give dose

2	Preheat 320°C for 60 s

3	IRSL 50, 100, 150, 200, 250°C for 200 s

4	IRSL 290°C for 200 s (pIRIR_50/290, pIRIR_100/290, pIRIR_150/290, pIRIR_200/290, pIRIR_250/290)	L_x

5	Give test dose

6	Preheat 320°C for 60 s

7	IRSL 50, 100, 150, 200, 250°C for 200 s

8	IRSL 290°C for 200 s (pIRIR_50/290, pIRIR_100/290, pIRIR_150/290, pIRIR_200/290, pIRIR_250/290)	T_x

9	Hot IR bleach for 200 s at 325°C

10	Return to step 1

Radioisotope concentration, water content, cosmic ray and dose-rate for sediment samples. Listed water content was natural value. The water content for dose rate calculation was estimated from the mean of natural and saturated (31.0%) water contents. For details see main text.

Sample	Depth (m)	Radioisotope concentraion				Water Content (%)	Cosmic Dose Rate (Gy/ka)	Dose-rate (Gy/ka)

		K (%)	Rb (ppm)	Th (ppm)	U (ppm)
Site 1
gsj13-040	7.40	0.62 ± 0.06	20.8 ± 2.1	1.35 ± 0.14	0.38 ± 0.04	3. 0	0.10	1.57 ± 0.12
gsj14-014	8.30	0.68 ± 0.07	23.2 ± 2.3	1.55 ± 0.16	0.44 ± 0.04	7.3	0.09	1.62 ± 0.12
gsj14-015	8.30	0.72 ± 0.07	23.1 ± 2.3	1.85 ± 0.19	0.48 ± 0.05	9.3	0.09	1.67 ± 0.12
gsj13-039	8.30	0.77 ± 0.08	19.9 ± 2.0	1.60 ± 0.16	0.44 ± 0.04	11.3	0.09	1.67 ± 0.12
gsj14-031	11.54	0.83 ± 0.08	24.9 ± 2.5	1.67 ± 0.17	0.52 ± 0.05	16.1	0.07	1.70 ± 0.12
gsj14-030	14.47	0.88 ± 0.09	24.1 ± 2.4	2.09 ± 0.21	0.60 ± 0.06	20.2	0.06	1.75 ± 0.12
gsj14-017	17.60	0.69 ± 0.07	23.1 ± 2.3	2.46 ± 0.25	0.46 ± 0.05	15.7	0.04	1.60 ± 0.11
gsj14-029	17.61	0.78 ± 0.08	22.9 ± 2.3	2.34 ± 0.23	0.74 ± 0.07	24.1	0.04	1.69 ± 0.12
Site 2
gsj13-093	11. 84	0.50 ± 0.05	19.2 ± 1.9	1.63 ± 0.16	0.46 ± 0.05	11.4	0.07	1.44 ± 0.10
gsj13-094	13.80	0.52 ± 0.05	18.0 ± 1.8	1.30 ± 0.13	0.37 ± 0.04	11.2	0.06	1.41 ± 0.10
gsj13-092	14.08	0.71 ± 0.07	25.5 ± 2.6	1.93 ± 0.19	0.58 ± 0.06	17.7	0.06	1.61 ± 0.11
gsj13-095	16.07	0.69 ± 0.07	24.9 ± 2.5	1.82 ± 0.18	0.52 ± 0.05	19.2	0.05	1.57 ± 0.11
gsj13-091	17.33	0.55 ± 0.06	22.1 ± 2.2	1.80 ± 0.18	0.47 ± 0.05	10.3	0.05	1.48 ± 0.11
gsj13-096	18.03	0.73 ± 0.07	24.3 ± 2.4	1.94 ± 0.19	0.54 ± 0.05	18.7	0.04	1.60 ± 0.11
Site 3
gsj14-019	0.10	0.18 ± 0.02	6.2 ± 0.6	0.79 ± 0.08	0.22 ± 0.02	5.9	0.21	1.50 ± 0.10

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Post-IR IRSL dating of K-feldspar from last interglacial marine terrace deposits on the Kamikita coastal plain, northeastern Japan

Published Online: Dec 29, 2017

Page range: 352 - 365

Received: Dec 26, 2016

Accepted: Sep 08, 2017

DOI: https://doi.org/10.1515/geochr-2015-0077

Keywords
post-IR IRSL dating, K-rich feldspar, fading correction, marine terrace, MIS 5e

© 2016 K. Ito.

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Fig. 6

Fig. 7

Fig. 8

Single aliquot regenerative (SAR) protocol used for De measurements.

Radioisotope concentration, water content, cosmic ray and dose-rate for sediment samples. Listed water content was natural value. The water content for dose rate calculation was estimated from the mean of natural and saturated (31.0%) water contents. For details see main text.

Post-IR IRSL dating of K-feldspar from last interglacial marine terrace deposits on the Kamikita coastal plain, northeastern Japan

Published Online: Dec 29, 2017

Page range: 352 - 365

Received: Dec 26, 2016

Accepted: Sep 08, 2017

DOI: https://doi.org/10.1515/geochr-2015-0077

Keywordspost-IR IRSL dating, K-rich feldspar, fading correction, marine terrace, MIS 5e

© 2016 K. Ito.

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Fig. 6

Fig. 7

Fig. 8

Single aliquot regenerative (SAR) protocol used for De measurements.

Radioisotope concentration, water content, cosmic ray and dose-rate for sediment samples. Listed water content was natural value. The water content for dose rate calculation was estimated from the mean of natural and saturated (31.0%) water contents. For details see main text.

Keywords
post-IR IRSL dating, K-rich feldspar, fading correction, marine terrace, MIS 5e