Table 2 Summary of Cretaceous palaeopoles from the Lhasa and west Qiangtang terranes, as well as from Eurasia and Mongolia.

From: New Early Cretaceous palaeomagnetic and geochronological results from the far western Lhasa terrane: Contributions to the Lhasa-Qiangtang collision

ID

lithology

Area

Slat (°N)

Slon (°E)

Age (Ma)

Plat (°N)

Plon (°E)

A95 (dp/dm) (°)

Palaeolat (°N)

n/N

Criterion (Q)

References

Cretaceous palaeomagnetic results from the western Lhasa terrane

CY

Limestone

Shiquanhe

32.7

80.2

K

67.7

234.2

13.1/24.5

11.8 ± 13.1

22/3

123γ5γ7 (5)

17

ZN

Volc

Cuoqin

31.4

85.1

~110–131

58.2

341.9

4.6

22.8 ± 4.6

162/18

123 F5R7 (7)

6

SQ

Volc + Limestone

Shiquanhe

32.2

80.4

~113–116

69.1

319.8

4.8

20.1 ± 4.8

205/19

123F5γ7 (6)

This study

QS

Volc

Yanhu

32.3

82.6

~120–132

61.4

192.9

2.1

18.2 ± 2.1

444/51

123F5D7 (7)

22

DZ

Volc

Cuoqin

31.1

84.4

~117–121

70.5

292.9

7.4

15.3 ± 7.4

116/12

123F*5D7 (7)

9

UC

Volc

Shiquanhe

32.4

80.1

~92.5

64.1

209.0

9.6

14.4 ± 9.6

78/10

123F5R7 (7)

23

LZ

Volc

Cuoqin

30.6

85.2

~99–93

63.1

224.6

5.1

9.5 ± 5.1

112/14

123F5γ7 (6)

21

LD

Volc

Shiquanhe

32.4

80.1

~68

47.7

180.3

3.4

17.2 ± 3.4

308/36

123F5D7 (7)

10

YR

Volc

Yare

31.6

82.2

~80

68.4

298.8

2.7

14.6 ± 2.7

136/15

123F5γ7 (6)

23

CQ

Redbeds

Cuoqin

31.2

84.7

K2

49.0

344.3

5.3

20.1 ± 5.3

291/33

123F5D7 (7)

9

The mean palaeolatitude for the 100 reliable Early Cretaceous palaeomagnetic sites

18.8 ± 1.2

927/100

 

This study

The mean palaeolatitude for the 108 reliable Late Cretaceous palaeomagnetic sites

16.1 ± 1.4

925/108

 

This study

The mean palaeolatitude for the 208 reliable Cretaceous palaeomagnetic sites

17.4 ± 1.0

1852/208

 

This study

Cretaceous palaeomagnetic results from the central Lhasa terrane

DN

Volc + Sed

Naqu

31.3

91.9

~120.2

66.9

281.2

6.1

9.4 ± 6.1

139/19

123F5D7 (7)

24

WR

Volc

Deqing

30.5

90.1

~114

66.4

220.3

6.9

15.9 ± 6.9

88/15

123γγ5γ7 (5)

18

NQ

Volc

Naqu

31.5

92.0

~96

78.0

282.0

4.0/6.9

20.4 ± 4.0

33/9

123γγγ7 (4)

16

QL

Volc

Chalicuo

31.7

91.0

~90

74.0

318.0

11.1/19.1

20.7 ± 11.1

20/4

1γ3γγγγ (2)

16

CG

Volc + Redbeds

Linzhou

29.9

91.1

68–75

70.5

269.6

4.9

12.7 ± 4.9

164/21

123F5R7 (7)

25

TY

Redbeds

Dingqing

31.1

95.6

K2

71.4

273.1

5.2

13.6 ± 5.2

150/15

123F5γ7 (6)

12

MX

Redbeds + Volc

Maxiang

29.9

90.7

K2

75

306.7

6.8

19.7 ± 6.8

126/20

123F5γ7 (6)

19

SX

Volc

Linzhou

29.9

91.2

K2

69.1

191.7

3.3/5.4

26.2 ± 3.3

132/21

123F5γ7 (6)

20

TX

Redbeds

Linzhou

29.9

91.2

K2

70.2

300.5

1.4/2.7

14.6 ± 1.4

377/43

123F5D7 (7)

20

PJ

Redbeds

Linzhou

29.9

91.2

K2

68.0

340.0

6.7/11.6

22.3 ± 6.7

68/7

123F5γ7 (6)

13

WM

Redbeds

Linzhou

29.9

91.2

K2

64.0

348.0

5.6/9.5

23.3 ± 5.6

57/6

123F5γ7 (6)

14

AN

Redbeds

Barda

31.7

91.5

K2

63.5

325.4

6.5

14.9 ± 6.5

49/6

123F5γ7 (6)

15

AS

Redbeds

Linzhou

29.9

91.1

K2

71.2

288.4

7.9

14.1 ± 7.9

61/8

123F5γ7 (6)

15

The mean palaeolatitude for the 166 reliable Cretaceous palaeomagnetic sites

16.1 ± 1.4

1323/166

 

This study

Cretaceous palaeomagnetic results from the western Qiangtang terrane

GZ1

Volc

Gaize

32.5

84.3

~104–111

79.3

339.8

5.7

29.7 ± 5.7

91/14

123F5γ7 (6)

27

LM

Redbeds

Longmucuo

34.5

80.4

Albian-Aptian

64.4

231.3

12.8

9.3 ± 12.8

41/4

123γ5D7 (6)

17

AK

Redbeds

Aksaichin

35.0

79.7

Albian-Aptian

66.3

256.5

6.6

8.5 ± 6.6

44/7

123F5γ7 (6)

17

GZ2

Redbeds

Gaize

32.5

84.3

K2-104

45.4

348.1

3.1

20.8 ± 3.1

174/22

123F5γ7 (6)

27

The mean palaeolatitude for the 47 reliable Cretaceous palaeomagnetic sites

20.2 ± 3.5

350/47

 

This study

Eurasia

EU1

    

70

−79.2

355.7

2.5

30.6 ± 2.5

  

57

EU2

    

80

−79.7

357.9

2.9

30.3 ± 2.9

  

57

EU3

    

90

−80.4

347.2

2.5

32.2 ± 2.5

  

57

EU4

    

100

−80.8

332.3

3.3

34.6 ± 3.3

  

57

EU5

    

110

−81.2

13.1

3.3

35.2 ± 3.3

  

57

EU6

    

120

−79.0

10.1

2.6

27.9 ± 2.6

  

57

EU7

    

130

−75.0

3.4

2.8

27.7 ± 2.8

  

57

EU

    

70~130

−79.6

357.8

2.4

30.3 ± 2.4

  

This study

Mongolia

MG

    

92~125

80.8

158.4

2.5

33.7 ± 2.5

  

58

  1. Notes: ID, palaeopoles abbreviation used in the plot and text; volc, volcanic rocks; sed, sedimentary rocks; K, Cretaceous; K2, Late Cretaceous; Slat (Slon), latitude (longitude) of sites; Plat (Plon), latitude (longitude) of poles; A95, the radius that the mean pole lies within 95% confidence; dp/dm, semi-axes of elliptical error of the pole at a probability of 95%; Paleolat, palaeolatitude calculated for the reference point at (32.2°N, 80.4°E) for the western Lhasa terrane, western Qiangtang terrane, Eurasia and Mongolia; at (32.2°N, 91.1°E) for the central Lhasa terrane; n/N, number of samples or sites (groups) used to calculate Fisher mean; Criteria (Q), data quality criteria (number of criteria met) after Van der Voo44 [1, well determined rock age; 2, sufficient sample number (N > 24, k ≥ 10 and α95 ≤ 16.0); 3, proper demagnetization techniques; 4, field tests; 5, structural control and tectonic coherence with the craton or block involved; 6, the presence of reversals; 7, no resemblance to paleopoles of younger ages (by more than a period); F, positive fold test; R, positive reversal test; D, dual-polarity; “γ”, failed to meet this criterion].
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