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

Earth, Planets and Space

Table 2 Paleomagnetic results in the second 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
A4	5^a	129.15	35.40	4/6	138.8	−54.7	24.9	18.8	263.7	−56.8	27.4	32.1
	6	129.15	35.40	4/5	17.5	13.7	27.1	18.0	275.6	57.3	9.4	18.4
	7	129.15	35.41	6/7	27.2	51.0	24.8	11.5	220.7	67.1	10.5	15.6
	8	129.15	35.41	6/7	36.5	33.0	60.5	8.7	237.8	53.3	5.6	9.9
	9	129.15	35.41	5/6	36.1	21.3	35.7	13.0	246.9	49.2	7.2	13.7
	10	129.15	35.41	4/6	20.5	23.4	24.4	19.0	265.4	60.3	10.8	20.2
	17	129.14	35.41	11/11	346.1	48.9	104.7	4.5	17.5	77.0	3.9	5.9
	19	129.14	35.41	14/18	346.2	36.5	15.5	10.4	351.6	70.6	7.1	12.1
	20	129.14	35.41	17/23	358.2	32.3	37.6	5.9	314.7	72.1	3.8	6.7
	21	129.15	35.41	24/24	16.4	36.2	36.0	5.0	261.5	69.0	3.4	5.8
	22	129.14	35.41	14/14	359.4	41.3	16.6	10.1	311.9	78.3	7.5	12.3
	23	129.14	35.41	9/21	201.3	−41.6	12.2	15.4	65.3	−68.3	11.5	18.8
	24	129.14	35.41	10/16	192.2	−53.0	8.3	17.8	46.0	−79.8	17.1	24.7
	25	129.14	35.41	10/13	357.0	48.4	25.5	9.8	332.8	83.5	8.4	12.9
	26	129.15	35.39	13/14	186.6	−46.9	10.2	13.7	89.7	−80.8	11.4	17.7
	27	129.15	35.39	19/22	192.2	−55.3	15.4	8.8	33.0	−80.1	8.9	12.5
	28	129.15	35.39	14/14	11.1	60.7	22.1	8.6	180.0	79.3	10.0	13.1
	29	129.15	35.39	8/10	3.9	32.3	23.5	11.7	297.2	71.8	7.4	13.2
	30	129.15	35.40	17/19	2.7	30.9	30.3	6.6	301.1	71.1	4.1	7.4
	Mean	Normal			10.7	50.0	31.1	7.2	243.4	79.9	A ₉₅=	6.4
	Mean	Reversed			192.3	−39.7	112.7	8.7	266.0	−73.3	A ₉₅=	6.3
	Mean				10.9	50.1	38.6	5.6	242.4	79.8	A ₉₅=	5.0
IWT	12	129.16	35.39	9/9	99.9	84.2	56.3	6.9	142.6	32.7	13.4	13.6
	13	129.16	35.39	10/10	240.4	70.6	12.7	14.1	98.1	14.0	21.2	24.4
	14	129.16	35.38	10/10	303.2	76.3	27.5	9.4	97.5	45.7	16.1	17.4
	15	129.16	35.38	8/8	338.4	73.8	22.6	11.9	106.1	61.8	19.3	21.4
	16	129.16	35.38	7/7	265.5	83.0	47.9	8.8	112.7	33.2	16.8	17.2
	Mean				285.7	82.3	17.6	5.3	110.5	38.1	A ₉₅=	10.1

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.