Table 1 Site (group)-mean ChRM directions of the Duoai Fm lava flows and Jiega Fm limestone from the Shiquanhe area in the far western Lhasa terrane.

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

Direction group

Site ID

Strike/Dip (°)

n/N (°)

Dg (°)

Ig (°)

Ds (°)

Is (°)

k (°)

α95 (°)

Plon (°)

Plat (°)

Duoai Fm lava flows

D1

ZN1

209/51

10/10

47.8

58.1

341.1

41.8

699.7

1.8

329.2

71.5

D1

ZN2

209/51

9/9

48.8

53.7

347.1

41.6

469.7

2.4

317.6

76.0

D1

ZN1 + 2

209/51

19/19

48.3

56

343.9

41.7

405.8

1.7

324.4

73.6

D2

ZN3

209/51

7/10

29.0

60.2

335.4

33.1

55.8

8.1

323.8

63.7

 

*ZN4

209/51

7/10

40.5

42.7

357.9

32.7

24.2

12.5

268.4

75.5

D3

ZN5

205/48

10/10

37.5

55.4

341.3

40.0

278.0

2.9

325.4

71.0

D4

ZN6

205/48

9/10

35.2

61.2

333.6

40.5

587.2

2.1

335.8

65.0

D5

ZN7

198/52

6/9

27.0

50.2

337.4

33.5

58.8

8.8

321.5

65.4

 

*ZN8

198/52

7/10

6.0

62.3

318.9

28.0

36.8

10.1

335.4

48.9

D6

ZN9

196/63

9/10

35.1

54.2

327.0

32.6

254.7

3.2

332.5

57.0

D6

ZN10

196/63

8/8

30.4

55.5

325.3

30.0

131.3

4.9

331.6

54.7

D6

ZN9 + 10

196/63

17/18

32.9

54.8

326.2

31.4

176.8

2.7

332.0

55.9

D7

ZN11

205/54

10/10

31.4

57.9

334.1

33.1

702.3

1.8

325.4

62.7

D7

ZN12

205/54

10/10

40.3

57.7

335.6

37.7

718.7

1.8

329.4

65.6

D7

ZN11 + 12

205/54

20/20

35.9

57.9

334.8

35.4

448.2

1.5

327.3

64.1

D8

ZN13

205/54

10/10

42.0

60.6

332.1

38.9

410.2

2.4

334.9

63.2

 

*ZN14

205/54

9/9

39.6

60.9

331.5

37.8

35.2

8.8

334.0

62.4

D8

ZN15

205/54

9/10

37.8

60.7

331.6

36.9

323.6

2.9

332.8

62.1

D8

ZN13 + 15

205/54

19/20

40

60.7

331.9

38.0

362.0

1.8

333.9

62.8

D9

ZN16

208/55

10/10

48.6

57.6

338.6

39.7

56.2

6.5

328.7

68.7

D10

ZN17

208/55

7/8

40.3

63.4

330.8

36.2

79.4

6.8

332.7

61.3

D10

ZN18

208/55

8/8

40.3

61.6

333.0

36.0

328.7

3.1

330.2

62.9

D10

ZN17 + 18

208/55

15/16

40.3

62.5

332.0

36.1

141.9

3.2

331.4

62.2

D11

ZN19

209/58

9/9

46.2

59.8

335.3

35.7

354.7

2.7

327.1

64.6

D11

ZN20

209/58

11/11

41.0

59.8

335.0

33.1

712.5

1.7

324.3

63.4

D11

ZN19 + 20

209/58

20/20

43.3

59.8

335.1

34.3

454.6

1.5

325.6

64.0

D12

ZN21

209/58

6/7

39.9

63.4

330.6

33.1

270.3

4.1

329.4

60.0

D13

ZN22

209/58

6/7

42.5

53.0

343.1

32.9

160.2

5.3

311.3

69.1

 

*ZN23

209/58

8/8

40.3

48.3

348.2

30.4

40.4

8.8

297.2

70.9

Sub-mean

(N = 23 sites)

  

37.9

57.6

335.7

35.7

108.5

2.9

326.6

65.1

K = 98.5

A 95  = 3.1

Group mean

(N = 13 sites)

  

38.4

58.1

335.6

36.2

226.1

2.8

327.5

65.2

K = 229.4

A 95  = 2.7

Jiega Fm limestone

T1

ZZ1

277.5/26.5

8/8

340.6

64.6

352.9

39.6

247.2

3.5

295.5

78.4

T2

ZZ2

277.5/26.5

5/9

349.3

45.0

354.0

19.4

97.5

7.8

276.1

67.1

T3

ZZ3

277.5/26.5

8/8

307.2

48.1

324.8

31.3

55.4

7.5

333.6

54.7

T4

ZZ4

48/17

8/8

354.1

23.4

0.4

36.6

263.3

3.4

259.0

78.2

T5

ZZ5

48/17

5/8

354.5

20.6

0.1

33.7

122.4

6.9

260.4

76.2

T6

ZZ6

54/18

7/9

356.2

28.8

4.0

43.4

137.0

5.2

232.9

82.3

Group mean

(N = 6 sites)

  

346.1

39.5

352.5

34.7

31.6

12.1

289.6

75.6

K = 31.5

A 95  = 12.1

Group mean

(N = 19 sites)

  

18.5

55.2

340.9

36.0

54.9

4.6

319.8

69.1

K = 49.0

A 95  = 4.8

  1. Notes: Site ID, site identification; n/N, number of samples used to calculate mean and measured; Dg, Ig, Ds, and Is, declination and inclination in geographic and stratigraphic coordinates, respectively; k (K), the best estimate of the precision parameter; α95 (A95), the radius that the mean direction (pole) lies within the 95% confidence; Plat and Plon, latitude and longitude of palaeopoles in stratigraphic coordinates. *Sites were not used to calculate the final mean direction.
  2. (1) The McFadden37 fold test for lava flows (N = 13) is positive at 95% confidence levels at “Xi2” test: critical Xi at 95% = 4.20. Xi2 IS = 5.00, Xi2 TC = 4.09.
  3. (2) The McFadden37 fold test for limestones (N = 6) is positive at 95% and 99% confidence levels: critical Xi at 95% and 99% = 2.86 and 3.92. Xi1 and Xi2 IS = 4.40 and 5.17, Xi1 and Xi2 TC = 1.48 and 1.27, respectively.
  4. (3) ① The McElhinny43 fold test for the lava flows and limestones (N = 19) is positive at 95% and 99% confidence levels: ks/kg = 3.84 > F(2*(n2-1), (n1-1)) at 5% and 1% point = 1.74 and 2.21, respectively; ② The McFadden37 fold test is positive at 99% confidence levels: critical Xi at 99% = 7.11. Xi1 and Xi2 IS = 15.39 and 17.27, Xi1 and Xi2 TC = 6.84 and 5.79, respectively.
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