Table T7. Selected microprobe analyses of orthopyroxene, Hole 735B. (Continued on next page.)

Table T7. Selected microprobe analyses of orthopyroxene, Hole 735B.

Core, section,
interval (cm):
101R-1 (Piece 7, 106-108) 112R-2 (Piece 1, 64-66) 130R-3 (Piece 11, 93-95) 156R-3 (Piece 5, 51-54)

Lithology:
Olivine gabbro Olivine gabbro Olivine gabbro Olivine gabbro

Texture:

VOl

VOl

VOl

VOl

M

M

BIf

BIf

BIf

BV

BV

BV

M

M

VOl

VOl

BV

BV

M

M

M

BIf

BIf

BIf

BV

SiO₂ 55.01 55.15 55.33 54.47 54.35 54.10 53.71 53.70 53.67 53.52 53.62 53.95 53.54 54.42 54.01 54.09 53.40 52.75 54.09 54.26 54.05 53.99 53.74 53.89 53.93

TiO₂ 0.14 0.08 0.11 0.01 0.15 0.13 0.26 0.30 0.35 0.27 0.34 0.19 0.36 0.11 0.24 0.11 0.20 0.13 0.35 0.37 0.33 0.32 0.35 0.25 0.10

Al₂O₃ 0.50 1.03 0.58 1.22 0.96 1.11 0.68 0.70 1.48 0.75 1.00 0.78 1.25 0.76 1.58 1.04 0.66 0.55 1.32 1.31 1.26 1.15 1.23 1.06 0.33

FeO* 16.43 16.17 16.47 16.58 18.39 18.21 21.49 20.94 18.56 20.89 20.08 21.25 18.68 18.04 18.44 18.21 21.10 22.87 16.27 16.44 16.34 17.26 17.32 17.35 19.76

MnO 0.51 0.47 0.45 0.40 0.45 0.49 0.61 0.64 0.47 0.58 0.56 0.58 0.47 0.52 0.46 0.49 0.51 0.53 0.40 0.39 0.42 0.40 0.46 0.42 0.55

MgO 26.85 27.27 26.88 27.45 25.50 24.96 22.34 22.67 24.58 22.82 23.33 22.35 24.14 25.41 24.63 25.12 22.55 21.27 26.17 26.41 26.24 25.49 25.46 25.45 24.04

CaO 0.83 0.34 0.79 0.27 0.96 0.91 1.04 1.09 1.09 1.16 1.35 1.57 1.58 0.55 1.02 0.36 1.01 0.94 1.27 1.30 1.22 1.19 1.21 0.98 0.74

Na₂O 0.00 0.01 0.00 0.00 0.03 0.02 0.00 0.00 0.04 0.01 0.02 0.03 0.02 0.01 0.00 0.00 0.03 0.02 0.02 0.01 0.00 0.04 0.01 0.01 0.00

K₂O 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.00 0.00 0.00 0.00 0.01 0.00 0.00

Cr₂O₃ 0.00 0.00 0.00 0.00 0.01 0.01 0.00 0.00 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.00 0.00 0.00 0.01 0.02 0.01 0.00

NiO 0.01 0.02 0.03 0.01 0.02 0.04 0.00 0.03 0.01 0.00 0.00 0.01 0.03 0.01 0.00 0.02 0.03 0.03 0.07 0.02 0.00 0.00 0.01 0.00 0.04

Total 100.28 100.54 100.64 100.40 100.82 99.98 100.12 100.08 100.26 100.01 100.30 100.70 100.07 99.82 100.38 99.45 99.50 99.10 99.96 100.51 99.87 99.84 99.82 99.42 99.48

Cations (O = 6):

Si 1.986 1.979 1.989 1.962 1.971 1.976 1.990 1.987 1.960 1.982 1.974 1.988 1.964 1.987 1.967 1.983 1.989 1.990 1.962 1.958 1.962 1.968 1.962 1.973 1.995

Ti 0.004 0.002 0.003 0.000 0.004 0.003 0.007 0.008 0.009 0.007 0.009 0.005 0.010 0.003 0.006 0.003 0.006 0.004 0.010 0.010 0.054 0.009 0.010 0.007 0.003

Al 0.021 0.044 0.024 0.052 0.041 0.048 0.030 0.031 0.064 0.033 0.043 0.034 0.054 0.033 0.068 0.045 0.029 0.024 0.057 0.056 0.009 0.049 0.053 0.046 0.014

Fe 0.496 0.485 0.495 0.500 0.558 0.556 0.666 0.648 0.567 0.647 0.618 0.655 0.573 0.551 0.561 0.558 0.657 0.722 0.494 0.496 0.496 0.526 0.529 0.531 0.611

Mn 0.016 0.014 0.014 0.012 0.014 0.015 0.019 0.020 0.015 0.018 0.018 0.018 0.015 0.016 0.014 0.015 0.016 0.017 0.012 0.012 0.013 0.012 0.014 0.013 0.017

Mg 1.445 1.459 1.440 1.475 1.378 1.359 1.234 1.250 1.338 1.260 1.280 1.228 1.320 1.383 1.337 1.373 1.252 1.197 1.415 1.421 1.420 1.385 1.386 1.389 1.325

Ca 0.032 0.013 0.030 0.011 0.037 0.036 0.041 0.043 0.043 0.046 0.053 0.062 0.062 0.021 0.040 0.014 0.040 0.038 0.049 0.050 0.047 0.047 0.047 0.039 0.029

Na 0.000 0.001 0.000 0.000 0.002 0.001 0.000 0.000 0.003 0.000 0.002 0.002 0.001 0.001 0.000 0.000 0.002 0.001 0.001 0.001 0.000 0.003 0.000 0.001 0.000

K 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000

Cr 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.001 0.000 0.000

Ni 0.000 0.000 0.001 0.000 0.001 0.001 0.000 0.001 0.000 0.000 0.000 0.000 0.001 0.000 0.000 0.001 0.001 0.001 0.002 0.001 0.000 0.000 0.000 0.000 0.001

Total 4.000 3.997 3.996 4.012 4.006 3.997 3.988 3.989 3.999 3.994 3.996 3.991 4.000 3.994 3.993 3.992 3.992 3.995 4.001 4.004 4.002 4.000 4.002 3.998 3.996

Mg# 74.4 75.0 74.4 74.7 71.2 71.0 65.0 65.9 70.2 66.1 67.4 65.2 69.7 71.5 70.4 71.1 65.6 62.4 74.1 74.1 74.1 72.5 72.4 72.3 68.4

Wo 1.6 0.7 1.5 0.5 1.9 1.8 2.1 2.2 2.2 2.4 2.7 3.2 3.2 1.1 2.1 0.7 2.1 1.9 2.5 2.6 2.4 2.4 2.4 2.0 1.5

En 73.2 74.5 73.3 74.3 69.9 69.7 63.6 64.4 68.7 64.5 65.6 63.1 67.5 70.7 69.0 70.6 64.2 61.2 72.3 72.2 72.3 70.7 70.6 70.9 67.4

Fs 25.1 24.8 25.2 25.2 28.3 28.5 34.3 33.4 29.1 33.1 31.7 33.7 29.3 28.2 29.0 28.7 33.7 36.9 25.2 25.2 25.3 26.9 27.0 27.1 31.1

Core, section, interval (cm):	101R-1 (Piece 7, 106-108)	112R-2 (Piece 1, 64-66)	130R-3 (Piece 11, 93-95)	156R-3 (Piece 5, 51-54)
Lithology:	Olivine gabbro	Olivine gabbro	Olivine gabbro	Olivine gabbro
Texture:	VOl	VOl	VOl	VOl	M	M	BIf	BIf	BIf	BV	BV	BV	M	M	VOl	VOl	BV	BV	M	M	M	BIf	BIf	BIf	BV
SiO₂	55.01	55.15	55.33	54.47	54.35	54.10	53.71	53.70	53.67	53.52	53.62	53.95	53.54	54.42	54.01	54.09	53.40	52.75	54.09	54.26	54.05	53.99	53.74	53.89	53.93
TiO₂	0.14	0.08	0.11	0.01	0.15	0.13	0.26	0.30	0.35	0.27	0.34	0.19	0.36	0.11	0.24	0.11	0.20	0.13	0.35	0.37	0.33	0.32	0.35	0.25	0.10
Al₂O₃	0.50	1.03	0.58	1.22	0.96	1.11	0.68	0.70	1.48	0.75	1.00	0.78	1.25	0.76	1.58	1.04	0.66	0.55	1.32	1.31	1.26	1.15	1.23	1.06	0.33
FeO*	16.43	16.17	16.47	16.58	18.39	18.21	21.49	20.94	18.56	20.89	20.08	21.25	18.68	18.04	18.44	18.21	21.10	22.87	16.27	16.44	16.34	17.26	17.32	17.35	19.76
MnO	0.51	0.47	0.45	0.40	0.45	0.49	0.61	0.64	0.47	0.58	0.56	0.58	0.47	0.52	0.46	0.49	0.51	0.53	0.40	0.39	0.42	0.40	0.46	0.42	0.55
MgO	26.85	27.27	26.88	27.45	25.50	24.96	22.34	22.67	24.58	22.82	23.33	22.35	24.14	25.41	24.63	25.12	22.55	21.27	26.17	26.41	26.24	25.49	25.46	25.45	24.04
CaO	0.83	0.34	0.79	0.27	0.96	0.91	1.04	1.09	1.09	1.16	1.35	1.57	1.58	0.55	1.02	0.36	1.01	0.94	1.27	1.30	1.22	1.19	1.21	0.98	0.74
Na₂O	0.00	0.01	0.00	0.00	0.03	0.02	0.00	0.00	0.04	0.01	0.02	0.03	0.02	0.01	0.00	0.00	0.03	0.02	0.02	0.01	0.00	0.04	0.01	0.01	0.00
K₂O	0.00	0.00	0.00	0.00	0.00	0.00	0.01	0.00	0.00	0.01	0.00	0.00	0.00	0.00	0.00	0.00	0.01	0.01	0.00	0.00	0.00	0.00	0.01	0.00	0.00
Cr₂O₃	0.00	0.00	0.00	0.00	0.01	0.01	0.00	0.00	0.02	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.01	0.01	0.00	0.00	0.00	0.01	0.02	0.01	0.00
NiO	0.01	0.02	0.03	0.01	0.02	0.04	0.00	0.03	0.01	0.00	0.00	0.01	0.03	0.01	0.00	0.02	0.03	0.03	0.07	0.02	0.00	0.00	0.01	0.00	0.04
Total	100.28	100.54	100.64	100.40	100.82	99.98	100.12	100.08	100.26	100.01	100.30	100.70	100.07	99.82	100.38	99.45	99.50	99.10	99.96	100.51	99.87	99.84	99.82	99.42	99.48
Cations (O = 6):
Si	1.986	1.979	1.989	1.962	1.971	1.976	1.990	1.987	1.960	1.982	1.974	1.988	1.964	1.987	1.967	1.983	1.989	1.990	1.962	1.958	1.962	1.968	1.962	1.973	1.995
Ti	0.004	0.002	0.003	0.000	0.004	0.003	0.007	0.008	0.009	0.007	0.009	0.005	0.010	0.003	0.006	0.003	0.006	0.004	0.010	0.010	0.054	0.009	0.010	0.007	0.003
Al	0.021	0.044	0.024	0.052	0.041	0.048	0.030	0.031	0.064	0.033	0.043	0.034	0.054	0.033	0.068	0.045	0.029	0.024	0.057	0.056	0.009	0.049	0.053	0.046	0.014
Fe	0.496	0.485	0.495	0.500	0.558	0.556	0.666	0.648	0.567	0.647	0.618	0.655	0.573	0.551	0.561	0.558	0.657	0.722	0.494	0.496	0.496	0.526	0.529	0.531	0.611
Mn	0.016	0.014	0.014	0.012	0.014	0.015	0.019	0.020	0.015	0.018	0.018	0.018	0.015	0.016	0.014	0.015	0.016	0.017	0.012	0.012	0.013	0.012	0.014	0.013	0.017
Mg	1.445	1.459	1.440	1.475	1.378	1.359	1.234	1.250	1.338	1.260	1.280	1.228	1.320	1.383	1.337	1.373	1.252	1.197	1.415	1.421	1.420	1.385	1.386	1.389	1.325
Ca	0.032	0.013	0.030	0.011	0.037	0.036	0.041	0.043	0.043	0.046	0.053	0.062	0.062	0.021	0.040	0.014	0.040	0.038	0.049	0.050	0.047	0.047	0.047	0.039	0.029
Na	0.000	0.001	0.000	0.000	0.002	0.001	0.000	0.000	0.003	0.000	0.002	0.002	0.001	0.001	0.000	0.000	0.002	0.001	0.001	0.001	0.000	0.003	0.000	0.001	0.000
K	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000
Cr	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.001	0.000	0.000
Ni	0.000	0.000	0.001	0.000	0.001	0.001	0.000	0.001	0.000	0.000	0.000	0.000	0.001	0.000	0.000	0.001	0.001	0.001	0.002	0.001	0.000	0.000	0.000	0.000	0.001
Total	4.000	3.997	3.996	4.012	4.006	3.997	3.988	3.989	3.999	3.994	3.996	3.991	4.000	3.994	3.993	3.992	3.992	3.995	4.001	4.004	4.002	4.000	4.002	3.998	3.996
Mg#	74.4	75.0	74.4	74.7	71.2	71.0	65.0	65.9	70.2	66.1	67.4	65.2	69.7	71.5	70.4	71.1	65.6	62.4	74.1	74.1	74.1	72.5	72.4	72.3	68.4
Wo	1.6	0.7	1.5	0.5	1.9	1.8	2.1	2.2	2.2	2.4	2.7	3.2	3.2	1.1	2.1	0.7	2.1	1.9	2.5	2.6	2.4	2.4	2.4	2.0	1.5
En	73.2	74.5	73.3	74.3	69.9	69.7	63.6	64.4	68.7	64.5	65.6	63.1	67.5	70.7	69.0	70.6	64.2	61.2	72.3	72.2	72.3	70.7	70.6	70.9	67.4
Fs	25.1	24.8	25.2	25.2	28.3	28.5	34.3	33.4	29.1	33.1	31.7	33.7	29.3	28.2	29.0	28.7	33.7	36.9	25.2	25.2	25.3	26.9	27.0	27.1	31.1

Notes: M = magmatic rim, VOl = vein in olivine, BIf = bleb in interfingering clinopyroxene, BV = bleb near vein. FeO* = total iron as FeO. Mg# = 100 x Mg/(Mg + Fe), Wo = 100 x Ca/(Ca + Mg + Fe), En = 100 x Mg/(Ca + Mg + Fe), Fs = 100 x Fe/(Ca + Mg + Fe).