Paleointensity determination of Late Cretaceous basalts in northwest South Korea: implications for low and stable paleofield strength in the Late Cretaceous

Earth, Planets and Space

Table 1. Summary of the seven criteria for selecting paleointensity.

Criterion	Implication	Threshold	Ref.
Number of points (N_p)	To obtain reliable paleointensity statistics	≥7	—
Maximum angular deviation (MAD)	To ensure stability of remanence direction	≤5°	[1]
Deviation angle (DANG)	To guarantee remanence direction toward the origin	≤5°	[2]
Scatter parameter (σ/ǀbǀ)	To assure straightness of the selected data points	≤0.1	[3]
Fraction of the NRM ( f )	To avoid under- and over-estimated paleointensity	≥0.5	[3]
pTRM check (CK_error)	To ensure little influence of thermal alteration	≤5%	[4]
Quality factor (q)	To ensure high-quality paleointensity data	≥10	[3]

N_p: the number of points used for paleointensity determination on the Arai plot; MAD: maximum angular deviation (Kirschvink, 1980); DANG: deviation angle (Tauxe and Staudigel, 2004); σ/ǀbǀ: the relative uncertainty of the slope determination, where b is a least squares slope on the Arai plot and σ is its standard error (Coe et al., 1978); f : fraction of the NRM (Coe et al., 1978); CK_error: the difference between repeat pTRM steps normalized by the intersection of the best-fit line with the pTRM axis on the Arai plot (Leonhardt et al., 2000); q: quality factor defined by ǀbǀ∙ f ∙g/σ, where g is the gap factor (Coe et al., 1978). [1] Kirschvink (1980), [2] Tauxe and Staudigel (2004), [3] Coe et al. (1978), [4] Leonhardt et al. (2000).