Table 7.

Table T7. "Lamprophyre" (composition and comparisons) and miscellaneous samples, Moresby Seamount talus.

Core, section, interval (cm) Sample SiO₂ Average TiO₂ Average Al₂O₃ Average Fe₂O₃ Average MnO Average MgO Average

180-1111A-

4R-CC, 3-5
1a
53.50

0.88

13.33

9.65

0.19

8.69

1b
52.38
52.94
0.86
0.87
13.08
13.21
9.54
9.60
0.19
0.19
8.66
8.68

180-1109
2

51.24

1.37

14.91

12.27

0.19

6.86

3

53.73

0.96

17.95

8.06

0.10

6.37

4

50.87

1.87

13.80

7.81

0.12

8.30

180-1112B-

1W-1, 12-18
5a
62.86

0.54

14.02

4.74

0.07

5.77

5b
63.25
63.05
0.54
0.54
14.13
14.07
4.77
4.75
0.07
0.07
5.87
5.82

180-1111A-

16R-CC, 16-20
6a
69.06

0.26

16.85

1.62

0.06

0.00

6b
68.78
68.05
0.26
0.26
16.78
16.81
1.63
1.63
0.06
0.06
0.00
0.00

Sample CaO Average Na₂O Average K₂O Average P₂O₅ Average Total Average LOI Average Rock type

1a
7.91

1.64

5.06

0.63

101.48

3.05

Lamprophyre

1b
7.80
7.86
1.73
1.69
4.96
5.01
0.62
0.63
99.82
100.70
3.05
3.05

2

12.45

1.71

0.11

0.11

101.21

1.79
Dolerite

3

7.93

3.06

2.92

0.52

99.67

1.02
Porphyritic clinopyroxene shoshonite

4

6.90

1.83

5.45

1.12

98.07

ND

5a
4.64

3.74

3.51

0.17

100.07

1.78

"Andesite"

5b
4.68
4.66
3.69
3.67
3.52
3.51
0.18
0.17
100.72
100.40
1.78
1.78

6a
2.02

5.13

5.51

0.11

100.26

2.05

Granite porphyry

6b
2.01
2.01
5.26
5.19
5.49
5.50
0.11
0.11
100.02
100.19
2.05
2.05

Core, section, interval (cm)	Sample	SiO₂	Average	TiO₂	Average	Al₂O₃	Average	Fe₂O₃	Average	MnO	Average	MgO	Average
180-1111A-
4R-CC, 3-5	1a	53.50		0.88		13.33		9.65		0.19		8.69
	1b	52.38	52.94	0.86	0.87	13.08	13.21	9.54	9.60	0.19	0.19	8.66	8.68
180-1109	2		51.24		1.37		14.91		12.27		0.19		6.86
	3		53.73		0.96		17.95		8.06		0.10		6.37
	4		50.87		1.87		13.80		7.81		0.12		8.30
180-1112B-
1W-1, 12-18	5a	62.86		0.54		14.02		4.74		0.07		5.77
	5b	63.25	63.05	0.54	0.54	14.13	14.07	4.77	4.75	0.07	0.07	5.87	5.82
180-1111A-
16R-CC, 16-20	6a	69.06		0.26		16.85		1.62		0.06		0.00
	6b	68.78	68.05	0.26	0.26	16.78	16.81	1.63	1.63	0.06	0.06	0.00	0.00

Sample	CaO	Average	Na₂O	Average	K₂O	Average	P₂O₅	Average	Total	Average	LOI	Average	Rock type
1a	7.91		1.64		5.06		0.63		101.48		3.05		Lamprophyre
1b	7.80	7.86	1.73	1.69	4.96	5.01	0.62	0.63	99.82	100.70	3.05	3.05
2		12.45		1.71		0.11		0.11		101.21		1.79	Dolerite
3		7.93		3.06		2.92		0.52		99.67		1.02	Porphyritic clinopyroxene shoshonite
4		6.90		1.83		5.45		1.12		98.07		ND
5a	4.64		3.74		3.51		0.17		100.07		1.78		"Andesite"
5b	4.68	4.66	3.69	3.67	3.52	3.51	0.18	0.17	100.72	100.40	1.78	1.78
6a	2.02		5.13		5.51		0.11		100.26		2.05		Granite porphyry
6b	2.01	2.01	5.26	5.19	5.49	5.50	0.11	0.11	100.02	100.19	2.05	2.05

Notes: LOI = loss on ignition. Major element values are in weight percent. Trace elements are in parts per million. a and b = duplicate analyses of the same sample; 1 = lamprophyre; 2 = average analysis of dolerite in Hole 1109D (Table T4, in the "Site 1109" chapter); 3 = from Woodlark Island (table 4 of Ashley and Flood, 1981); 4 = average of three analyses of Madilogo Volcano, Papua (Blake, 1976); 5 = "andesite"; 6 = one of four recovered during Leg 180. ND = not determined.