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Table 1 Summary of sample information

From: Geochemical characteristics of back-arc basin lower crust and upper mantle at final spreading stage of Shikoku Basin: an example of Mado Megamullion

Sample name

Lithology

Depth (m)

Latitude

Longitude

Maximum grain size (mm)

Mode (vol%)

Comment

Ol

Pl

Cpx

Ox

Amp

Opx

Total

YK18-07-6K-1515-R8

Dolerite

5490

23°50.5850′ N

138°48.0841′ E

1

–

57.4

36.8

2.6

3.2

–

100

 

YK18-07-6K-1515-R11

Dolerite

5162

23°50.4648′ N

138°48.3606′ E

Not measured

      

YK18-07-6K-1515-R12

Dolerite

5162

23°50.4648′ N

138°48.3606′ E

0.5

–

66.2

29.7

2.7

1.4

–

100

 

YK18-07-6K-1515-R13

Dolerite

5162

23°50.4648′ N

138°48.3606′ E

0.5

–

66.6

29.1

3.4

1.0

–

100

 

YK20-18S-6K-1569-R7a

Dolerite

5713

23°53.3793′ N

138°49.0433′ E

Not measured

      

YK20-18S-6K-1569-R10

Dolerite

5713

23°53.3793′ N

138°49.0433′ E

Not measured

      

YK18-07-6K-1515-R4

Oxide gabbro

5599

23°50.6100′ N

138°47.9940′ E

10

–

51.0a

27.0 a

15.0 a

7.0 a

–

100

Coarse-grained

YK18-07-6K-1515-R14

Oxide gabbro

5073

23°50.4372′ N

138°48.3942′ E

10

–

46.2

29.6

14.1

10.1

–

100

Coarse-grained

YK20-18S-6K-1569-R4-2

Oxide gabbro

5713

23°53.3793′ N

138°49.0433′ E

Not measured

     

Mylonitic. Contact with YK20-18S-6K-1569-R4-1

YK20-18S-6K-1569-R6

Oxide gabbro

5713

23°53.3793′ N

138°49.0433′ E

Not measured

     

Mylonitic

YK20-18S-6K-1569-R8a

Oxide gabbro

5713

23°53.3793′ N

138°49.0433′ E

Not measured

     

Mylonitic

YK19-04S-6K-1536-R18

Olivine gabbro

3540

23°49.6782′ N

138°56.6738′ E

3

9.8

54.9

25.2

0.5

7.6

2.0

100

Interstitial brown amphibole and opx

KH-18-2-D05-R101A-a

Olivine gabbro

4522

23°51.7310′ N

138°57.8930′ E

5

1.0 a

58.0 a

36.0 a

–

5.0 a

–

100

Varitextured

YK20-18S-6K-1569-R4-1

Olivine gabbro

5713

23°53.3793′ N

138°49.0433′ E

Not measured

     

Mylonitic. Contact with YK20-18S-6K-1569-R4-2

YK19-04S-6K-1536-R14B-2

Olivine gabbro

3608

23°49.7226′ N

138°56.6931′ E

3

2.8

55.4

26.3

3.2

12.3

–

100

Mylonitic. Contact with YK19-04S-6K-1536-R14B-1

KH-18-2-D05-R101B-1

Gabbro

4522

23°51.7310′ N

138°57.8930′ E

2

–

49.5

43.0

1.1

6.5

–

100

 

YK19-04S-6K-1536-R14B-1

Gabbro

3608

23°49.7226′ N

138°56.6931′ E

10

–

63.7

24.4

–

11.9

–

100

Porphyroclastic. Contact with YK19-04S-6K-1536-R14B-2

YK19-04S-6K-1536-R16

Gabbro

3608

23°49.7226′ N

138°56.6931′ E

5

–

36.9

49.2

–

13.9

–

100

Porphyroclastic

KH-18-2-D05-R101B-2

Hybridized gabbro

4522

23°51.7310′ N

138°57.8930′ E

10

–

71.9

18.0

2.9

7.2

–

100

See Basch et al. (2020) for sample photo

Sample name

Lithology

Depth (m)

Latitude

Longitude

Mode (vol%)

Comment

Ol

Ser

Opx

Cpx

Bas

Spl

Total

KH-18-2-D12-R7-2

Dunite

5403

23°49.3060′ N

138°47.6350′ E

–

96.9

0.3

–

0.3

2.6

100

Massive spl. Opx presents in association with spl

KH-18-2-D12-R12

Dunite

5403

23°49.3060′ N

138°47.6350′ E

–

93.5

–

–

0.1

6.4

100

Massive spl. Spherical ser inclusion in spl after olivine

KH-18-2-D12-R32B

Dunite

5403

23°49.3060′ N

138°47.6350′ E

–

89.7

–

–

6.6

3.8

100

Massive spl. Bas presents in association with spl

KH-18-2-D12-R2

Peridotite

5403

23°49.3060′ N

138°47.6350′ E

–

71.8

–

–

27.5

0.7

100

Vermicular spl in association with bastite

KH-18-2-D12-R6

Peridotite

5403

23°49.3060′ N

138°47.6350′ E

–

72.3

11.7

–

15.3

0.7

100

Vermicular spl in association with bastite

KH-18-2-D15-R1

Peridotite

5271

23°28.5670′ N

139°02.6920′ E

–

76.1

–

–

23.0

0.9

100

Deformed opx

YK18-07-6K-1515-R3

Peridotite

5680

23°50.6599′ N

138°47.9216′ E

0.3

76.4

14.0

0.1

7.2

1.9

100

Vermicular spl. Deformed opx

KH-18-02-D12-R4

Peridotite

5403

23°49.3060′ N

138°47.6350′ E

–

83.3

7.8

-

7.9

1.0

100

Network-like vein (oxide gabbroic)

KH-18-02-D12-R15

Peridotite

5403

23°49.3060′ N

138°47.6350′ E

–

82.4

4.0

–

13.1

0.4

100

Deformed opx. Network-like vein (oxide gabbroic)

YK18-07-6K-1515-R2

Peridotite

5680

23°50.6599′ N

138°47.9216′ E

–

87.8

0.5

–

11.5

0.2

100

Network-like vein (oxide gabbroic)

YK18-07-6K-1515-R6

Peridotite

5490

23°50.5850′ N

138°48.0841′ E

Not measured

     

Network-like vein (oxide gabbroic)

YK18-07-6K-1515-R9

Peridotite

5295

23°50.5202′ N

138°48.2549′ E

–

83.4

0.6

–

15.6

0.4

100

Vermicular spl. Network-like vein (oxide gabbroic)

YK18-07-6K-1515-R10

Peridotite

5295

23°50.5202′ N

138°48.2549′ E

Not measured

     

Network-like vein (gabbroic)

YK18-07-6K-1515-R15

Peridotite

5032

23°50.4233′ N

138°48.4398′ E

Not measured

     

Network-like vein (gabbroic)

YK19-04S-6K-1536-R12A

Peridotite

3748

23°49.8227′ N

138°56.7323′ E

Not measured

     

Network-like vein (oxide gabbroic)

  1. Ol, olivine; Pl, plagioclase; Cpx, clinopyroxene; Ox, Fe-Ti oxide; Amp, amphibole; Opx, orthopyroxene; Bas, bastite; spl, chromian spinel
  2. aRefered to Basch et al. (2020)