Skip to main content

Table 1 Results of the rock magnetic experiments and the Tsunakawa-Shaw paleointensity experiments

From: Archeointensity study on baked clay samples taken from the reconstructed ancient kiln: implication for validity of the Tsunakawa-Shaw paleointensity method

Sample ARM0 0 N hys B rc /B c M rs /M s LTD Anisotropy First heating Second heating F ΔAIC
  [10 -5 Am 2 /kg]     [%] ratio H c Slope A1 Slope N f N r N H c Slope A2 Slope T f T r T (μT)  
Floor surface
1 247 2 1.564 0.4267 21.8 1.12 40-180 0.882 1.28 (0.166) (0.982) 0-180 1.03 (1.05) 0.999 1.00   −1.66
2 343 2 2.730 0.2696 9.1 0.972 40-110 0.932 1.08 0.369 1.00 0-180 1.02 0.978 0.986 0.999 43.2 0.17
5 302 2 1.470 0.4252 24.7 1.05 20-180 0.976 1.16 0.570 0.999 0-180 1.00 1.05 1.01 1.00 46.4 5.26
8 274 4 1.581 0.3970 16.5 1.03 20-180 0.991 1.20 0.530 0.999 14-180 1.03 1.05 0.779 0.999 48.0 −0.17
9 171 2 1.702 0.4296 32.9 1.06 20-180 0.939 1.21 0.691 0.999 0-180 1.04 0.984 0.998 1.00 48.4 11.6
11 261 4 2.029 0.3420 14.0 0.980 20-180 0.972 1.24 0.672 0.998 0-180 0.969 1.04 1.01 0.999 49.6 16.3
12 142 4 1.683 0.4074 24.2 1.24 20-180 1.04 1.20 0.503 0.999 0-180 1.01 1.02 0.999 1.00 48.0 0.18
13 262 4 1.750 0.4001 28.5 1.10 45-180 0.925 0.994 (0.233) 0.998 0-180 1.00 1.05 0.993 1.00   11.9
  250 8 1.814 0.3872 21.4             47.3  
  ±66   ±0.406 ±0.0552 ±7.9             ±2.2  
−20-cm level
15 38.2 2 2.153 0.3064 7.8 1.06 70-180 0.826 1.46 (0.206) 0.995 0-180 1.08 0.984 1.01 1.00   0.55
16 21.0 2 2.385 0.2372 4.0 0.986 20-120 1.01 0.790 0.743 0.996 0-180 1.08 0.999 0.977 0.998 31.6 −0.31
18 3.69 2 3.639 0.1344 20.5 0.941 20-180 1.03 0.909 0.623 (0.964) 0-180 0.939 1.01 0.914 0.968   −0.92
19 5.35 2 4.905 0.1164 7.5 0.958 20-180 1.00 0.863 0.547 (0.883) 0-180 0.934 0.985 0.970 0.986   7.79
  17.1 4 3.271 0.1986 10.0             31.6  
  ±16.1   ±1.270 ±0.0894 ±7.2              
  1. ARM00, initial ARM0 intensity after LTD; Nhys, number of chips for the hysteresis measurements; Brc/Bc, Mrs/Ms, sample-averaged ratios of coercivity of remanence (Brc) to coercive force (Bc) and saturation remanent magnetization (Mrs) to saturation magnetization (Ms); LTD, LT demagnetized fraction of ARM0; anisotropy ratio, ratios of ARMTRM direction to ARMNRM direction before laboratory heating; Hc, the coercivity interval taken for the linear segments; slopeA1, slopeA2, slopes of ARM spectra for Hc in the ARM0-ARM1 and ARM1-ARM2 diagrams; slopeN, slopeT, slopes of the linear segments in the NRM-TRM1* and TRM1-TRM2* diagrams; fN, fT, NRM and TRM1 fractions of the linear NRM-TRM1* and TRM1-TRM2* segments; rN, rT, correlation coefficients of the linear NRM-TRM1* and TRM1-TRM2* segments; F, calculated paleointensity; ΔAIC, AIC difference between linear and quadratic fit (Yamamoto and Tsunakawa, 2005); Numbers in parentheses indicate out of the selection criteria; Numbers in italic are averaged values with their 1 σ for the sample groups.