Direct comparison of site-specific and basin-scale denudation rate estimation by in situ cosmogenic nuclides: an example from the Abukuma Mountains, Japan

Progress in Earth and Planetary Science

Table 3 Summary of sample data from the Abukuma Mountains

Sample	Depth (cm)	Dissolved quartz (mg)	¹⁰Be/ ⁹Be (10 ⁻¹⁴)	1σ error (10 ⁻¹⁴)	¹⁰Be concentration (10 ⁴atoms/g)	1σ error (10 ⁴atoms/g)	²⁶Al/ ²⁷Al (10 ⁻¹³)	1σ error (10 ⁻¹³)	²⁶Al concentration (10 ⁵atoms/g)	1σ error (10 ⁵atoms/g)
ABK101-8	39.0	25,028.70	10.63	0.66	8.43	0.53	2.37	0.14	4.38	0.26
ABK101-10	73.6	25,020.16	6.35	0.48	5.05	0.38	1.73	0.14	3.02	0.24
ABK101-12	108.3	24,973.98	4.59	0.41	3.68	0.33	1.70	0.13	3.57	0.28
ABK101-14	142.9	25,009.59	-	-	-	-	1.32	0.12	2.47	0.23
ABK101-17	194.9	25,012.77	4.81	0.41	3.82	0.33	1.09	0.12	2.15	0.23
ABK101-20	248.5	24,978.36	-	-	-	-	0.99	0.11	1.91	0.21
ABK103-1	37.2	25,007.06	16.63	0.92	13.05	0.72	2.40	0.18	5.57	0.42
ABK103-3	81.7	25,003.43	5.24	0.39	4.17	0.31	1.34	0.12	3.07	0.28
ABK103-5	126.3	24,997.33	-	-	-	-	1.29	0.15	2.53	0.29
ABK103-12	282.4	22,166.50	3.44	0.33	3.08	0.29	0.87	0.14	2.03	0.33
ABK-R1	-	29,839.39	10.42	0.53	6.96	0.36	2.98	0.30	5.29	0.52
ABK-R3	-	24,123.85	5.83	0.26	4.80	0.22	2.01	0.17	3.16	0.26

Background values of ¹⁰Be and ²⁶Al are subtracted using the value of each process blank, which is treated in the same batch. ¹⁰Be ratios of process blanks for depth profile and river sediment are 2.63 ± 0.20 × 10⁻¹⁴ and 2.13 ± 0.12 × 10⁻¹⁴, respectively. These values are indistinguishable from the value of ¹⁰Be/⁹Be of added commercial 100 ppm Be carrier (Wako Co., Ltd.; 2 × 10⁻¹⁴), and the long-term average value of the process blank (2 × 10⁻¹⁴). ²⁶Al ratios of process blanks for depth profile and river sediment are 5.28 ± 0.74 × 10⁻¹⁵ and 7.12 ± 7.12 × 10⁻¹⁶, respectively. Counting errors (1σ) of standards and process blanks measured with AMS are propagated to the counting uncertainty on the sample ratios. We do not have Be data for ABK101-14, −20, and ABK103-5 because sample treatment was unsuccessful.