Table T7. Microprobe analyses of amphiboles in Leg 176 gabbros. (Continued on next page.)

Table T7. Microprobe analyses of amphiboles in Leg 176 gabbros.

Sample:*

MS6-3

MS11-5

MS14-7

MS22-11

MS22-11

MS24-13

MS25-14

MS25-14

MS28-17

MS41-18

MS41-18

MS41-18

MS60-19

MS72-22

MS89-29

GS32-3

FV2-1

FV5-2

FV13-3

FV35-6

FV37-7

FV39-8

FV45-9a

FV45-9b

FV47-10

N:

2

5

5

3

2

3

4

3

4

3

4

4

6

3

3

3

4

5

2

3

4

9

3

3

3

Major element oxides (wt%):

SiO₂ 46.77 45.80 48.19 42.80 45.90 48.80 38.89 39.62 46.66 43.75 50.05 46.83 56.07 43.75 47.95 42.34 54.68 53.37 49.34 48.09 43.23 52.94 49.80 51.33 44.51

TiO₂ 3.06 1.67 0.42 3.31 0.86 0.49 1.38 3.22 0.74 2.78 0.56 0.59 0.01 3.77 1.11 3.59 0.07 0.43 1.11 1.99 3.56 0.30 1.28 0.82 0.56

Al₂O₃ 10.24 10.38 9.53 11.32 8.41 3.91 11.39 11.01 7.65 10.11 4.86 7.09 1.73 11.66 2.86 11.32 2.74 3.17 4.48 6.37 11.40 1.94 5.08 3.75 10.94

Cr₂O₃ 0.68 0.01 0.00 0.02 0.00 0.01 0.01 0.01 0.11 0.00 0.01 0.00 0.00 0.07 0.03 0.06 0.00 0.31 0.01 0.01 0.07 0.01 0.00 0.01 0.01

FeOt 6.57 11.07 10.67 12.52 17.29 13.61 20.65 14.82 4.91 15.21 15.70 18.07 11.23 10.05 6.94 11.28 9.63 6.81 17.95 14.59 11.19 17.01 14.44 14.30 11.22

MnO 0.10 0.18 0.17 0.21 0.22 0.30 0.20 0.19 0.11 0.25 0.33 0.27 0.05 0.14 0.19 0.17 0.29 0.12 0.31 0.36 0.15 0.19 0.41 0.38 0.18

MgO 17.13 15.47 16.08 13.65 11.88 17.06 8.23 11.68 15.50 12.13 13.17 11.43 23.81 14.68 15.35 13.39 17.19 20.45 11.86 13.79 13.16 12.77 14.07 13.83 15.07

CaO 13.00 11.04 11.40 10.88 11.04 8.70 11.25 11.03 14.04 10.87 11.61 11.11 0.60 11.19 18.67 11.03 12.11 10.27 10.53 10.01 10.96 11.64 10.38 11.36 10.99

NiO 0.10 0.02 0.03 0.01 0.03 0.02 0.01 0.01 0.03 0.02 0.01 0.01 0.08 0.04 0.00 0.01 0.03 0.10 0.01 0.02 0.01 0.05 0.02 0.03 0.03

Na₂O 2.43 2.33 1.78 2.78 1.59 1.00 2.64 2.85 1.31 2.43 1.11 1.67 0.08 2.62 0.44 2.72 0.60 0.63 1.07 2.15 3.32 0.58 1.51 0.75 2.64

K₂O 0.01 0.22 0.30 0.27 0.38 0.06 0.42 0.31 0.00 0.35 0.10 0.37 0.08 0.20 0.00 0.26 0.03 0.07 0.30 0.22 0.29 0.10 0.22 0.27 0.26

P₂O₅ 0.08 0.03 0.01 0.02 0.01 0.01 0.00 0.01 0.01 0.01 0.01 0.01 0.03 0.04 0.01 0.04 0.01 0.02 0.00 0.00 0.02 0.01 0.00 0.01 0.03

Total: 100.16 98.22 98.57 97.77 97.61 93.97 95.07 94.76 91.06 97.91 97.52 97.46 93.77 98.21 93.55 96.22 97.38 95.76 96.97 97.59 97.38 97.52 97.22 96.84 96.42

Calculated cation proportions:

Si 6.8260 6.9061 7.1835 6.5813 7.1575 7.6709 6.4533 6.4115 7.3825 6.7841 7.6909 7.3362 8.3622 6.6076 7.5766 6.5854 8.1103 7.9394 7.7025 7.3750 6.6390 8.1275 7.6319 7.8705 6.8617

Ti 0.3352 0.1892 0.0467 0.3822 0.1005 0.0583 0.1717 0.3919 0.0879 0.3243 0.0654 0.0697 0.0011 0.4277 0.1315 0.4202 0.0074 0.0481 0.1306 0.2301 0.4106 0.0350 0.1471 0.0951 0.0649

Al 1.7589 1.8451 1.6742 2.0506 1.5452 0.7251 2.2304 2.1013 1.4267 1.8470 0.8841 1.3093 0.3035 2.0754 0.5316 2.0749 0.4818 0.5514 0.8255 1.1561 2.0636 0.3548 0.9179 0.6796 1.9873

Cr 0.0780 0.0014 0.0003 0.0018 0.0004 0.0010 0.0013 0.0007 0.0136 0.0006 0.0009 0.0005 0.0004 0.0079 0.0035 0.0070 0.0000 0.0365 0.0006 0.0010 0.0087 0.0006 0.0005 0.0017 0.0007

Fe 0.7997 1.3933 1.3281 1.6068 2.2517 1.7934 2.8658 2.0035 0.6486 1.9691 2.0159 2.3640 1.3984 1.2677 0.9160 1.4650 1.1981 0.8496 2.3403 1.8701 1.4349 2.1879 1.8478 1.8323 1.4445

Mn 0.0129 0.0227 0.0218 0.0270 0.0284 0.0402 0.0281 0.0261 0.0150 0.0326 0.0434 0.0353 0.0064 0.0184 0.0257 0.0225 0.0364 0.0154 0.0411 0.0465 0.0194 0.0243 0.0526 0.0489 0.0231

Ni 0.0111 0.0029 0.0030 0.0015 0.0039 0.0028 0.0009 0.0018 0.0035 0.0023 0.0009 0.0015 0.0093 0.0049 0.0005 0.0014 0.0033 0.0121 0.0012 0.0023 0.0017 0.0054 0.0021 0.0032 0.0033

Mg 3.7235 3.4753 3.5700 3.1260 2.7604 3.9973 2.0356 2.8168 3.6522 2.8027 3.0137 2.6665 5.2887 3.3015 3.6129 3.1034 3.7888 4.5444 2.7591 3.1478 3.0113 2.9145 3.2120 3.1580 3.4603

Ca 2.0315 1.7836 1.8202 1.7925 1.8437 1.4600 2.0012 1.9124 2.3787 1.8054 1.9105 1.8649 0.0958 1.8101 3.1583 1.8372 1.9262 1.6245 1.7603 1.6453 1.8025 1.9142 1.7040 1.8666 1.8140

Na 0.6842 0.6822 0.5133 0.8271 0.4794 0.3049 0.8517 0.8958 0.4015 0.7311 0.3321 0.5081 0.0236 0.7659 0.1352 0.8210 0.1729 0.1812 0.3244 0.6409 0.9882 0.1723 0.4488 0.2235 0.7879

K 0.0027 0.0414 0.0564 0.0535 0.0758 0.0127 0.0899 0.0638 0.0000 0.0685 0.0190 0.0747 0.0144 0.0377 0.0004 0.0516 0.0057 0.0133 0.0606 0.0431 0.0573 0.0191 0.0427 0.0522 0.0513

P 0.0093 0.0034 0.0010 0.0027 0.0016 0.0019 0.0000 0.0008 0.0013 0.0013 0.0018 0.0010 0.0043 0.0053 0.0018 0.0053 0.0012 0.0022 0.0000 0.0001 0.0030 0.0016 0.0005 0.0010 0.0037

Total: 16.273 16.347 16.218 16.453 16.248 16.068 16.730 16.626 16.012 16.369 15.979 16.232 15.508 16.330 16.094 16.395 15.732 15.818 15.946 16.158 16.440 15.757 16.008 15.833 16.503

Mg# 82.3 71.4 72.9 66.0 55.0 69.2 41.6 58.4 84.9 58.8 59.9 53.0 79.1 72.3 79.8 67.9 75.5 84.2 54.1 62.6 67.7 57.1 63.5 63.3 70.5

Notes: * = ODP sample designations are listed in Table T1. N = averages of a number of point analyses on more than one crystal in a thin section are reported. The analyses were done on a JXA-8800L Superprobe at The University of Queensland. See text for analytical details.

Sample:*	MS6-3	MS11-5	MS14-7	MS22-11	MS22-11	MS24-13	MS25-14	MS25-14	MS28-17	MS41-18	MS41-18	MS41-18	MS60-19	MS72-22	MS89-29	GS32-3	FV2-1	FV5-2	FV13-3	FV35-6	FV37-7	FV39-8	FV45-9a	FV45-9b	FV47-10
N:	2	5	5	3	2	3	4	3	4	3	4	4	6	3	3	3	4	5	2	3	4	9	3	3	3

Major element oxides (wt%):
SiO₂	46.77	45.80	48.19	42.80	45.90	48.80	38.89	39.62	46.66	43.75	50.05	46.83	56.07	43.75	47.95	42.34	54.68	53.37	49.34	48.09	43.23	52.94	49.80	51.33	44.51
TiO₂	3.06	1.67	0.42	3.31	0.86	0.49	1.38	3.22	0.74	2.78	0.56	0.59	0.01	3.77	1.11	3.59	0.07	0.43	1.11	1.99	3.56	0.30	1.28	0.82	0.56
Al₂O₃	10.24	10.38	9.53	11.32	8.41	3.91	11.39	11.01	7.65	10.11	4.86	7.09	1.73	11.66	2.86	11.32	2.74	3.17	4.48	6.37	11.40	1.94	5.08	3.75	10.94
Cr₂O₃	0.68	0.01	0.00	0.02	0.00	0.01	0.01	0.01	0.11	0.00	0.01	0.00	0.00	0.07	0.03	0.06	0.00	0.31	0.01	0.01	0.07	0.01	0.00	0.01	0.01
FeOt	6.57	11.07	10.67	12.52	17.29	13.61	20.65	14.82	4.91	15.21	15.70	18.07	11.23	10.05	6.94	11.28	9.63	6.81	17.95	14.59	11.19	17.01	14.44	14.30	11.22
MnO	0.10	0.18	0.17	0.21	0.22	0.30	0.20	0.19	0.11	0.25	0.33	0.27	0.05	0.14	0.19	0.17	0.29	0.12	0.31	0.36	0.15	0.19	0.41	0.38	0.18
MgO	17.13	15.47	16.08	13.65	11.88	17.06	8.23	11.68	15.50	12.13	13.17	11.43	23.81	14.68	15.35	13.39	17.19	20.45	11.86	13.79	13.16	12.77	14.07	13.83	15.07
CaO	13.00	11.04	11.40	10.88	11.04	8.70	11.25	11.03	14.04	10.87	11.61	11.11	0.60	11.19	18.67	11.03	12.11	10.27	10.53	10.01	10.96	11.64	10.38	11.36	10.99
NiO	0.10	0.02	0.03	0.01	0.03	0.02	0.01	0.01	0.03	0.02	0.01	0.01	0.08	0.04	0.00	0.01	0.03	0.10	0.01	0.02	0.01	0.05	0.02	0.03	0.03
Na₂O	2.43	2.33	1.78	2.78	1.59	1.00	2.64	2.85	1.31	2.43	1.11	1.67	0.08	2.62	0.44	2.72	0.60	0.63	1.07	2.15	3.32	0.58	1.51	0.75	2.64
K₂O	0.01	0.22	0.30	0.27	0.38	0.06	0.42	0.31	0.00	0.35	0.10	0.37	0.08	0.20	0.00	0.26	0.03	0.07	0.30	0.22	0.29	0.10	0.22	0.27	0.26
P₂O₅	0.08	0.03	0.01	0.02	0.01	0.01	0.00	0.01	0.01	0.01	0.01	0.01	0.03	0.04	0.01	0.04	0.01	0.02	0.00	0.00	0.02	0.01	0.00	0.01	0.03
Total:	100.16	98.22	98.57	97.77	97.61	93.97	95.07	94.76	91.06	97.91	97.52	97.46	93.77	98.21	93.55	96.22	97.38	95.76	96.97	97.59	97.38	97.52	97.22	96.84	96.42
Calculated cation proportions:
Si	6.8260	6.9061	7.1835	6.5813	7.1575	7.6709	6.4533	6.4115	7.3825	6.7841	7.6909	7.3362	8.3622	6.6076	7.5766	6.5854	8.1103	7.9394	7.7025	7.3750	6.6390	8.1275	7.6319	7.8705	6.8617
Ti	0.3352	0.1892	0.0467	0.3822	0.1005	0.0583	0.1717	0.3919	0.0879	0.3243	0.0654	0.0697	0.0011	0.4277	0.1315	0.4202	0.0074	0.0481	0.1306	0.2301	0.4106	0.0350	0.1471	0.0951	0.0649
Al	1.7589	1.8451	1.6742	2.0506	1.5452	0.7251	2.2304	2.1013	1.4267	1.8470	0.8841	1.3093	0.3035	2.0754	0.5316	2.0749	0.4818	0.5514	0.8255	1.1561	2.0636	0.3548	0.9179	0.6796	1.9873
Cr	0.0780	0.0014	0.0003	0.0018	0.0004	0.0010	0.0013	0.0007	0.0136	0.0006	0.0009	0.0005	0.0004	0.0079	0.0035	0.0070	0.0000	0.0365	0.0006	0.0010	0.0087	0.0006	0.0005	0.0017	0.0007
Fe	0.7997	1.3933	1.3281	1.6068	2.2517	1.7934	2.8658	2.0035	0.6486	1.9691	2.0159	2.3640	1.3984	1.2677	0.9160	1.4650	1.1981	0.8496	2.3403	1.8701	1.4349	2.1879	1.8478	1.8323	1.4445
Mn	0.0129	0.0227	0.0218	0.0270	0.0284	0.0402	0.0281	0.0261	0.0150	0.0326	0.0434	0.0353	0.0064	0.0184	0.0257	0.0225	0.0364	0.0154	0.0411	0.0465	0.0194	0.0243	0.0526	0.0489	0.0231
Ni	0.0111	0.0029	0.0030	0.0015	0.0039	0.0028	0.0009	0.0018	0.0035	0.0023	0.0009	0.0015	0.0093	0.0049	0.0005	0.0014	0.0033	0.0121	0.0012	0.0023	0.0017	0.0054	0.0021	0.0032	0.0033
Mg	3.7235	3.4753	3.5700	3.1260	2.7604	3.9973	2.0356	2.8168	3.6522	2.8027	3.0137	2.6665	5.2887	3.3015	3.6129	3.1034	3.7888	4.5444	2.7591	3.1478	3.0113	2.9145	3.2120	3.1580	3.4603
Ca	2.0315	1.7836	1.8202	1.7925	1.8437	1.4600	2.0012	1.9124	2.3787	1.8054	1.9105	1.8649	0.0958	1.8101	3.1583	1.8372	1.9262	1.6245	1.7603	1.6453	1.8025	1.9142	1.7040	1.8666	1.8140
Na	0.6842	0.6822	0.5133	0.8271	0.4794	0.3049	0.8517	0.8958	0.4015	0.7311	0.3321	0.5081	0.0236	0.7659	0.1352	0.8210	0.1729	0.1812	0.3244	0.6409	0.9882	0.1723	0.4488	0.2235	0.7879
K	0.0027	0.0414	0.0564	0.0535	0.0758	0.0127	0.0899	0.0638	0.0000	0.0685	0.0190	0.0747	0.0144	0.0377	0.0004	0.0516	0.0057	0.0133	0.0606	0.0431	0.0573	0.0191	0.0427	0.0522	0.0513
P	0.0093	0.0034	0.0010	0.0027	0.0016	0.0019	0.0000	0.0008	0.0013	0.0013	0.0018	0.0010	0.0043	0.0053	0.0018	0.0053	0.0012	0.0022	0.0000	0.0001	0.0030	0.0016	0.0005	0.0010	0.0037
Total:	16.273	16.347	16.218	16.453	16.248	16.068	16.730	16.626	16.012	16.369	15.979	16.232	15.508	16.330	16.094	16.395	15.732	15.818	15.946	16.158	16.440	15.757	16.008	15.833	16.503
Mg#	82.3	71.4	72.9	66.0	55.0	69.2	41.6	58.4	84.9	58.8	59.9	53.0	79.1	72.3	79.8	67.9	75.5	84.2	54.1	62.6	67.7	57.1	63.5	63.3	70.5