(U–Th)/He thermochronometric mapping across the northeast Japan Arc: towards understanding mountain building in an island-arc setting

Fukuda, Shoma; Sueoka, Shigeru; Kohn, Barry P.; Tagami, Takahiro

doi:10.1186/s40623-020-01151-z

Earth, Planets and Space

Table 2 Parameters of zircon (U–Th)/He dating

From: (U–Th)/He thermochronometric mapping across the northeast Japan Arc: towards understanding mountain building in an island-arc setting

Sample code (A02-)	Lab. No.	He No.	[⁴He] (ncc)	Mass (mg)	^aMean F_T	[U] (ppm)	[Th] (ppm)	Th/U	^b[eU] (ppm)	Corrected age ± 1σ (Ma)	Grain length (µm)	Grain half width (μm)	^cGrain morphology
FST03	13105	41539	36.338	0.0106	0.82	234.1	126.5	0.41	263.8	18.4 ± 1.1	234.1	63.2	2T
FST03	13106	41542	12.125	0.0084	0.78	300.5	87.2	0.49	321.0	48.0 ± 3.0^e	300.5	43.6	2T
FST03	13107	41545	10.038	0.0069	0.79	211.8	105.0	0.58	236.4	29.4 ± 1.8	211.8	52.5	2T
FST03	13108	41548	12.851	0.0054	0.78	188.8	100.4	0.34	212.4	20.9 ± 1.3	188.8	50.2	2T
FST03	13528	42663	8.961	0.0058	0.77	294.2	127.3	0.43	324.1	39.0 ± 2.4^e	226.2	43.8	2T
Weighted mean age ± 95% CI 21.3 ± 3.3
FST04	13110	41551	44.923	0.0111	0.82	259.4	117.1	0.36	286.9	90.6 ± 5.6	259.4	58.6	2T
FST04	13111	41554	43.203	0.0100	0.81	249.6	113.4	0.25	276.2	81.9 ± 5.1	249.6	56.7	2T
FST04	13112	41557	42.156	0.0110	0.81	289.8	105.3	0.42	314.6	88.0 ± 5.5	289.8	52.7	2T
FST04	13113	41560	43.589	0.0161	0.83	314.4	124.4	0.35	343.6	77.5 ± 4.8	314.4	62.2	2T
Weighted mean age ± 95% CI 83.9 ± 8.3
FST05	13114	41563	0.601	0.0024	0.71	133.2	86.1	1.08	153.5	8.4 ± 0.5	133.2	43.0	2T
FST05	13115	41566	0.427	0.0047	0.76	187.4	91.1	0.99	208.8	9.7 ± 0.6	187.4	45.6	2T
FST05	13116	41569	0.963	0.0038	0.75	164.3	91.4	1.23	185.8	10.7 ± 0.7	164.3	45.7	2T
FST05	13117	41572	1.148	0.0043	0.75	186.8	86.6	0.77	207.1	12.4 ± 0.8	186.8	43.3	2T
Weighted mean age ± 95% CI 9.9 ± 1.0
FST06	13118	41575	11.701	0.0073	0.78	265.0	88.8	0.25	285.9	6.2 ± 0.4	265.0	44.4	2T
FST06	13119	41578	14.870	0.0121	0.82	294.4	110.0	0.23	320.3	11.6 ± 0.7	294.4	55.0	2T
FST06	13120	41581	11.226	0.0070	0.78	248.8	90.8	0.19	270.2	12.5 ± 0.8	248.8	45.4	2T
FST06	13121	41810	23.065	0.0086	0.79	266.9	96.9	0.85	289.7	6.2 ± 0.4	266.9	48.5	2T
Weighted mean age ± 95% CI N/A
FST10	13123	41816	11.057	0.0120	0.82	274.3	116.5	0.77	301.7	20.4 ± 1.3	274.3	58.2	2T
FST10	13124	41819	16.644	0.0166	0.84	293.4	135.5	0.70	325.3	18.4 ± 1.1	293.4	67.7	2T
FST10	13125	41822	9.993	0.0096	0.81	222.6	124.9	0.50	251.9	17.3 ± 1.1	222.6	62.5	2T
FST10	13122	42089	11.204	0.0107	0.82	685.9	720.6	1.05	855.2	10.1 ± 0.6	211.5	74.6	2T
FST10	13530	42669	5.907	0.0076	0.80	570.4	341.6	0.60	650.6	9.9 ± 0.6	219.8	53.5	2T
Weighted mean age ± 95% CI N/A
FST11	13126	41825	3.594	0.0081	0.80	220.0	111.7	0.45	246.3	13.0 ± 0.8	220.0	55.9	2T
FST11	13127	41828	3.202	0.0100	0.82	226.0	126.6	0.45	255.8	13.9 ± 0.9	226.0	63.3	2T
FST11	13128	41831	6.154	0.0104	0.81	262.8	110.6	0.48	288.8	26.9 ± 1.7^e	262.8	55.3	2T
FST11	13129	41834	3.844	0.0095	0.81	232.4	118.3	0.46	260.2	20.6 ± 1.3	232.4	59.1	2T
FST11	13527	42660	9.087	0.0114	0.81	177.0	86.3	0.49	197.3	33.2 ± 2.1^e	285.9	54.3	2T
Weighted mean age ± 95% CI 14.7 ± 2.3
FST12	13130	41837	1.755	0.0087	0.81	217.9	119.1	0.34	245.9	15.3 ± 1.0	217.9	59.6	2T
FST12	13131	41840	4.736	0.0112	0.81	286.4	107.4	0.27	311.6	19.7 ± 1.2	286.4	53.7	2T
FST12	13132	41843	1.865	0.0075	0.80	221.9	105.9	0.34	246.8	17.7 ± 1.1	221.9	52.9	2T
FST12	13133	41846	3.316	0.0101	0.80	290.6	99.5	0.48	314.0	41.1 ± 2.5^e	290.6	49.8	2T
FST12	13526	42657	7.514	0.0139	0.81	92.9	41.5	0.45	102.6	43.1 ± 2.7^e	359.6	51.2	2T
Weighted mean age ± 95% CI 17.2 ± 2.7
Fish Canyon Tuff Zircon standard
FCT	12927	40745	11.287	0.0100	0.80	288.1	145.6	0.51	322.3	28.7 ± 1.8	272.5	52.4	2T
FCT	13147	41584	11.635	0.0107	0.81	291.4	103.3	0.51	315.6	29.9 ± 1.9	291.4	51.6	2T
FCT	13459	42364	6.811	0.0059	0.78	300.0	154.8	0.52	336.4	28.1 ± 1.7	211.7	47.1	2T
Reference age^d ± 1σ 28.01 ± 0.04

N/A denotes a weighted mean age was not adopted because of poor reproducibility
^aF_T is the a-ejection correction after Farley et al. (1996)
^bEffective uranium concentration (U ppm + 0.235 Th ppm) (Shuster et al. 2006)
^cGrain morphology: 0T = no terminations, 1T = one termination, 2T = two terminations (Brown et al. 2013)
^dThe reference age for Fish Canyon Tuff zircon after Phillips and Matchan (2013)
^eGrain age regarded as an outlier

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