Geological Society of London
SP497-2019-71_si_001.xlsx (30.88 kB)

The first archaeointensity records from New Zealand: evidence for a fifteenth century AD archaeomagnetic "spike" in the SW Pacific region?

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posted on 2020-01-29, 13:09 authored by Gillian M. Turner, Rimpy Kinger, Bruce McFadgen, Monique Gevers
All specimen-level palaeointensity data, quality parameters, checks and site averages. Columns give specimen ID (specimens marked with a * are those for which a high blocking temperature component was subtracted before the palaeointensity was estimated); palaeointensity estimate; uncertainty σB); Tmin and Tmax, the blocking temperature range over which the palaeointensity was calculated; N, the number of temperature steps in this range; β is the fractional uncertainty – the ratio of σB to the palaeointensity; f is the fraction of the NRM, (or low blocking temperature component) used in the calculation; g is the gap factor and q a quality factor (= fg/β) (both from Coe et al., 1978); w (=q/√N−2) is the weighting factor of Prevot et al. (1985); δCK and δTR are measures of the maximum differences found in pTRM checks and tail checks respectively; MADfree is the maximum angular deviation of the principal component analysis fit to the remanence data over the selected temperature interval calculated without anchoring the fit to the origin of the vector component plot; TT* class is the overall quality classification of Leonhardt et al., 2004, modified by Paterson et al. (2014). The criteria for TT*A and TT*B classes are given at the end of the appendix. For each site a simple average and standard deviation is given, an inverse variance weighted average, and an average and standard deviation of data weighted according to the parameter w of Prevot et al., (1985). There is insignificant difference between the results of these different methods of averaging, and the w-weighted average was adopted.