Paleomagnetism and U-Pb geochronology of the late Cretaceous Chisulryoung Volcanic Formation, Korea: tectonic evolution of the Korean Peninsula

Earth, Planets and Space

Table 1 Paleomagnetic results in the first eruption cycle

Member	Site	ϕ _s	λ _s	n ₁ / n ₂	D _i	I _i	k	α ₉₅	ϕ _p	λ _p	dp	dm
A3	1	129.14	35.40	6/10	16.2	48.0	87.8	7.2	239.2	74.9	6.2	9.4
	2	129.14	35.40	5/7	13.8	49.3	59.6	10.0	239.5	77.3	8.8	13.3
	3	129.14	35.40	5/7	23.2	50.3	65.4	9.5	225.2	70.2	8.5	12.7
	4^a	129.14	35.39	9/9	134.7	15.0	28.9	9.7	183.1	−29.4	5.1	10.0
	Mean				19.1	49.2	76.5	4.2	232.1	73.1	A ₉₅=	3.7
A1	11	129.15	35.41	4/8	16.6	52.2	82.2	10.2	225.1	76.0	9.6	14.0
	18	129.14	35.41	7/11	29.8	53.1	59.7	7.9	214.5	65.5	7.6	11.0
	Mean				24.9	52.9	61.7	5.9	217.3	69.4	A ₉₅=	5.6

ϕ _p/λ _p, sampling site longitude/latitude; n ₁/n ₂, number of samples used in calculating means/demagnetized at each site; D _i/I _i, mean declination/inclination; k, precision parameter; α ₉₅, 95% confidence limit; ϕ _p/λ _p, VGP longitude/latitude; dp/dm, confidence limits; A ₉₅, the angular radius of an ellipse within which the mean pole lies within 95% confidence. ^aNot included in mean calculation.