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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 (Ra)# min 4He/20Ne 3HeET (pcc g− 1) 3HeET 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   
  1. *Based on the sedimentation rate (mean ± 2SD) derived from an astronomically tuned cyclostratigraphy age model for the Permian section
  2. #Error assigned to the isotopic ratio is 1σ