Feb 15, 2017 - Green symbols represent the data from M0.35, M0.75, M1.5, M5,. M12, M30, and M250 samples; red symbols represent the data from the MIX ...
advances.sciencemag.org/cgi/content/full/3/2/e1602306/DC1
Supplementary Materials for Intrinsic paleointensity bias and the long-term history of the geodynamo Aleksey V. Smirnov, Evgeniy V. Kulakov, Marine S. Foucher, Katie E. Bristol Published 15 February 2017, Sci. Adv. 3, e1602306 (2017) DOI: 10.1126/sciadv.1602306
This PDF file includes:
Supplementary Results fig. S1. Typical dependences of low-field magnetic susceptibility versus temperature. fig. S2. Magnetic hysteresis properties. table S1. Paleointensity results obtained using the conventional Thellier method by fitting the high- and low-temperature segments of the Arai plots. table S2. Paleointensity results obtained using the LTD-Thellier method by fitting the high- and low-temperature segments of the Arai plots.
fig. S1. Typical dependences of low-field magnetic susceptibility (κ) versus temperature. Data measured from magnetite powders with the mean grain size of 0.75 μm (A) and 250 μm (B). Red and blue lines represent the heating and cooling curves, respectively.
fig. S2. Magnetic hysteresis properties. (A, B, C) Typical magnetic hysteresis loops after paramagnetic slope correction measured from the M0.35 (A), M1.5 (B), and M250 (C) samples. (D) A Day plot (21) with data for all measured samples. Green symbols represent the data from M0.35, M0.75, M1.5, M5, M12, M30, and M250 samples; red symbols represent the data from the MIX samples. Abbreviations are: Mrs, saturation remanence; Ms, saturation magnetization; Hc, coercivity; Hcr, coercivity of remanence; SD single-domain; PSD, pseudo-single-domain; MD, multidomain. Gray lines represent SD-MD mixing models (24).
table S1. Paleointensity results obtained using the conventional Thellier method by fitting the high- and low-temperature segments of the Arai plots. H and dH are the paleointensity value and its standard deviation; N – the number of successive data points used for fitting; f – the fraction of NRM, g - gap factor, q - quality factor (18); d(CK) is the maximum pTRM check deviation within and below the selected Arai segment, normalized to the "true" TRM, which is determined from the intersection of the linear fit with the x-axis (47). High-temperature fit (525-585°C)*
Low-temperature fit (100-450°C)
Sample
H
dH
N
f
g
q
d(CK)
H
dH
N
f
M0.35-1
48.79
0.29
6
0.830
0.710
97.66
2.71
61.07
2.18
6
0.089
M0.35-2
49.02
0.32
6
0.831
0.709
91.03
1.37
56.14
3.45
6
0.084
M0.35-3
49.66
0.14
6
0.834
0.709
215.05
2.49
56.74
5.31
6
0.077
SD Mean
49.16
0.45
57.98
2.69
M0.75-1
46.02
0.20
6
0.789
0.601
122.22
3.09
87.46
3.25
6
0.132
M0.75-2
45.03
0.15
6
0.800
0.599
141.50
2.83
91.24
4.79
6
0.135
M0.75-3
46.40
1.30
6
0.799
0.610
17.63
1.95
70.15
10.40
6
0.098
M0.75 Mean
45.82
0.71
82.95
11.25
M1.5-1
44.03
0.14
6
0.774
0.604
146.21
1.25
107.30
11.13
6
0.190
M1.5-2
44.10
0.39
6
0.816
0.713
65.18
1.63
99.26
6.80
6
0.155
M1.5-3
43.39
0.92
6
0.834
0.722
28.55
1.83
105.66
11.47
6
0.197
M1.5 Mean
43.84
0.39
104.07
4.25
M5-1
40.47
0.81
6
0.805
0.715
28.64
2.02
117.11
7.51
6
0.202
M5-2
39.78
1.14
6
0.805
0.736
20.75
2.68
121.71
8.21
6
0.213
M5-3
38.87
1.25
6
0.788
0.733
17.99
2.82
142.95
11.47
6
0.244
M5 Mean
39.71
0.80
127.26
13.78
M12-1
35.18
1.48
6
0.772
0.754
13.85
1.54
145.19
14.20
6
0.277
M12-2
35.79
0.61
6
0.678
0.721
28.51
2.70
104.65
11.06
6
0.327
M12-3
36.55
1.65
6
0.781
0.745
12.87
2.00
137.67
13.60
6
0.258
M12 Mean
35.84
0.69
129.17
21.57
M30-1
28.15
1.24
6
0.626
0.753
10.71
2.80
116.31
12.24
6
0.402
M30-2
28.51
1.99
6
0.725
0.757
7.85
3.40
139.28
8.18
6
0.325
M30-3
29.39
1.85
6
0.717
0.755
8.58
2.72
132.32
7.57
6
0.315
M30 Mean
28.68
0.64
129.30
11.78
M250-1*
20.74
1.57
5
0.677
0.726
6.48
2.95
184.65
15.61
6
0.420
M250-2*
20.99
1.77
5
0.670
0.731
5.81
3.04
180.66
15.35
6
0.420
M250-3*
21.24
2.21
5
0.641
0.688
4.24
1.82
206.86
8.78
6
0.385
M250 Mean*
20.99
0.25
190.72
14.12
MIX-1
43.13
1.35
6
0.822
0.743
19.57
1.81
104.37
6.22
6
0.174
MIX-2
44.74
1.01
6
0.824
0.736
26.97
2.85
92.55
6.18
6
0.153
MIX-3
45.34
0.85
6
0.825
0.732
32.09
3.43
87.60
5.56
6
0.144
MIX Mean
44.40
1.14
94.84
8.62
* The 540-585°C range was used for the M250 samples.
table S2. Paleointensity results obtained using the LTD-Thellier method by fitting the highand low-temperature segments of the Arai plots. H and dH are the paleointensity value and its standard deviation; N – the number of successive data points used for fitting; f – the fraction of NRM, g - gap factor, q - quality factor (18); d(CK) is the maximum pTRM check deviation within and below the selected Arai segment, normalized to the "true" TRM, which is determined from the intersection of the linear fit with the x-axis (47). High-temperature fit (525-585°C)*
Low-temperature fit (100-450°C)
Sample
H
dH
N
f
g
q
d(CK)
H
dH
N
f
M0.35-1
49.30
0.26
6
0.835
0.711
112.47
1.64
55.24
2.41
6
0.075
M0.35-2
49.73
0.24
6
0.838
0.708
122.42
2.04
53.02
1.88
6
0.077
M0.35-3
50.05
0.08
6
0.842
0.71
386.58
0.9
50.16
0.09
6
0.07
SD Mean
49.69
0.38
52.81
2.55
M0.75-1
50.32
0.27
6
0.805
0.595
89.282
2.26
57.87
2.88
6
0.078
M0.75-2
49.93
0.18
6
0.808
0.587
134.04
2.21
51.49
3.64
6
0.069
M0.75-3
49.54
0.62
6
0.805
0.604
39.01
1.89
59.39
5.84
6
0.076
M0.75 Mean
49.93
0.39
56.25
4.19
M1.5-1
49.13
0.16
6
0.791
0.609
149.09
2.22
54.64
3.81
6
0.09
M1.5-2
49.51
0.58
6
0.826
0.714
50.244
2.51
52.77
5.18
6
0.077
M1.5-3
48.58
0.37
6
0.831
0.713
77.11
1.44
61.14
3.56
6
0.097
M1.5 Mean
49.07
0.47
56.18
4.39
M5-1
48.33
0.31
6
0.832
0.717
93.89
1.47
62.85
2.25
6
0.091
M5-2
47.01
0.45
6
0.823
0.727
62.88
1.81
75.88
7.97
6
0.114
M5-3
47.78
0.41
6
0.829
0.719
70.06
1.91
68.92
6.10
6
0.1
M5 Mean
47.71
0.66
69.22
6.52
M12-1
45.19
0.80
6
0.848
0.736
37.94
3.84
80.91
12.66
6
0.12
M12-2
44.49
0.93
6
0.766
0.722
26.48
1.79
82.21
5.97
6
0.163
M12-3
44.96
0.41
6
0.824
0.723
64.78
3.7
73.81
3.03
6
0.11
M12 Mean
44.88
0.36
78.98
4.52
M30-1
34.26
1.57
6
0.8
0.735
12.8
3.25
136.33
5.34
6
0.22
M30-2
33.69
1.79
6
0.73
0.762
10.45
1.58
122.48
3.63
6
0.199
M30-3
35.00
1.58
6
0.717
0.758
12.03
1.9
110.39
3.02
6
0.184
M30 Mean
34.32
0.66
123.07
12.98
M250-1*
21.92
1.34
5
0.676
0.733
8.08
2.49
157.51
12.60
6
0.388
M250-2*
22.13
1.25
5
0.641
0.739
8.376
1.56
159.52
12.63
6
0.391
M250-3*
22.83
2.01
5
0.644
0.688
5.023
1.89
173.42
6.38
6
0.374
M250 Mean*
22.29
0.48
163.48
8.66
MIX-1
47.84
0.62
6
0.827
0.724
45.87
2.12
72.71
3.88
6
0.107
MIX-2
48.28
0.36
6
0.835
0.718
80.56
2.81
66.15
1.93
6
0.101
MIX-3
48.73
0.26
6
0.835
0.715
112.19
2.13
103.26
5.14
6
0.185
48.28
0.45
80.71
19.81
MIX Mean
* The 540-585°C range was used for the M250 samples.
