Enhanced flux of extraterrestrial 3He across the Permian–Triassic boundary

Onoue, Tetsuji; Takahata, Naoto; Miura, Mitsutaka; Sato, Honami; Ishikawa, Akira; Soda, Katsuhito; Sano, Yuji; Isozaki, Yukio

doi:10.1186/s40645-019-0267-0

Progress in Earth and Planetary Science

Table 1 ³He and ⁴He concentrations, and ³He/⁴He ratios for samples from the Waidani section

From: Enhanced flux of extraterrestrial ³He across the Permian–Triassic boundary

Sample	Height (m)	MAR* (g cm^− 2 kyr^− 1)	Temperature (°C)	³He (pcc g^− 1)	⁴He (μcc g^− 1)	³He /⁴He (R_a)^#	min ⁴He/²⁰Ne	³He_ET (pcc g^− 1)	³He_ET flux (pcc cm^− 2 kyr^− 1)
Bulk
NF-62	0.88		1800	0.06	0.18	0.25 ± 0.04	40	0.06
NF-51 K	0.60		1800	0.05	0.17	0.22 ± 0.03	26	0.05
NF-51I	0.30		1800	0.05	0.20	0.19 ± 0.03	53	0.05
NF-51G	0.12		1800	0.08	0.32	0.17 ± 0.03	70	0.07
NF-51D	0.00		1800	0.12	0.47	0.18 ± 0.02	49	0.11
NF-51A	−0.10		1800	0.08	0.21	0.27 ± 0.03	44	0.08
NF-48B	−0.33	0.81 ± 0.18	1800	0.23	0.36	0.47 ± 0.02	37	0.23	0.18 ± 0.05
NF-45B	−0.53	0.81 ± 0.18	1800	0.30	0.29	0.75 ± 0.02	82	0.30	0.24 ± 0.05
NF-41B	−0.76	0.81 ± 0.18	1800	0.24	0.32	0.55 ± 0.02	211	0.23	0.19 ± 0.04
NF-37B	−0.90	0.81 ± 0.18	1800	0.34	0.34	0.72 ± 0.02	37	0.34	0.27 ± 0.06
NF-32B	−1.11	0.81 ± 0.18	1800	0.18	0.27	0.47 ± 0.02	49	0.17	0.14 ± 0.03
NF-29B	−1.25	0.81 ± 0.18	1800	0.13	0.15	0.59 ± 0.02	37	0.12	0.10 ± 0.02
NF-25B	−1.42	0.81 ± 0.18	1800	0.13	0.22	0.43 ± 0.02	58	0.13	0.10 ± 0.02
NF-24B	−1.50	0.81 ± 0.18	1800	0.14	0.24	0.42 ± 0.02	60	0.13	0.11 ± 0.02
NF-23B	−1.56	0.81 ± 0.18	1800	0.09	0.14	0.45 ± 0.03	36	0.08	0.07 ± 0.02
NF-21B	−1.63	0.81 ± 0.18	1800	0.07	0.09	0.53 ± 0.03	22	0.06	0.05 ± 0.01
NF-17B	−1.82	0.81 ± 0.18	1800	0.10	0.19	0.35 ± 0.03	34	0.09	0.07 ± 0.02
NF-12B	−2.01	0.81 ± 0.18	1800	0.18	0.27	0.48 ± 0.02	38	0.17	0.14 ± 0.03
NF-11B	−2.08	0.81 ± 0.18	1800	0.09	0.21	0.32 ± 0.03	13	0.09	0.07 ± 0.02
blank				0.01	0.01
air						1.00	0.32
Stepwise heating
NF-37B	−0.90		550	0.075	0.232	0.23 ± 0.02	194
NF-37B	−0.90		650	0.071	0.054	0.95 ± 0.02	48
NF-37B	−0.90		750	0.067	0.009	5.22 ± 0.09	13
NF-37B	−0.90		850	0.071	0.004	13.5 ± 0.2	6
NF-37B	−0.90		950	0.019	0.001	13.9 ± 0.5	5
NF-37B	−0.90		1800	0.006	0.001	3.80 ± 0.22	2
NF-37B	−0.90		total	0.31	0.30	0.73
12 M HF–3 M HCl dissolution
NF-51I	0.60		750–950	0.002	0.001	1.22 ± 0.07	143
NF-41B	−0.76		750–950	0.014	< 0.001	107.1 ± 1.9	33
NF-37B	−0.90		750–950	0.007	< 0.001	149.7 ± 8.8	10
NF-37B	−0.90		950–1800	0.003	< 0.001	16.6 ± 0.7	34
NF-25B	−1.42		750–950	< 0.001	< 0.001	2.98 ± 0.27	45

*Based on the sedimentation rate (mean ± 2SD) derived from an astronomically tuned cyclostratigraphy age model for the Permian section
^#Error assigned to the isotopic ratio is 1σ

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