Table T3. Elemental content, mineral composition, LOI, and Mg# of representative serpentinized ultramafic rocks, Site 1200. (Continued on next page.)

Table T3. Elemental content, mineral composition, LOI, and Mg# of representative serpentinized ultramafic rocks, Site 1200.


	Hole 1200A
Core, section:	3R-1	6R-1	7R-2	7R-2	7R-2	10R-1	10R-1	10R-1	11R-1	11R-1	11R-1	12R-1
Interval (cm): Piece:	81-84 2	31-33 2	27-29 1A	69-71 1C	116-118 2	13-15 3	93-95 11	100-102 12	20-24 6	28-30 7	63-65 11	3-5 1
Depth (mbsf):	19.01	41.71	51.96	52.38	52.85	80.03	80.83	80.90	89.60	89.68	90.03	99.03
Rock type:	Harzburgite	Dunite	Harzburgite	Harzburgite	Harzburgite	Harzburgite	Lherzolite	Harzburgite	Harzburgite	Harzburgite	Harzburgite	Harzburgite
Major element oxides (wt%):
SiO₂	43.76	41.12	44.05	43.83	44.41	42.90	43.12	44.26	43.98	44.08	43.99	44.42
TiO₂	0.01	0.01	0.01	0.01	0.01	0.01	0.02	0.02	0.02	0.02	0.01	0.01
Al₂O₃	0.56	0.62	0.72	0.74	0.70	0.72	0.95	0.82	0.84	0.68	0.71	0.64
Fe₂O₃T	8.33	8.71	8.26	8.46	8.13	8.32	8.28	8.45	8.62	8.66	8.84	7.95
MnO	0.11	0.11	0.12	0.12	0.12	0.13	0.11	0.12	0.13	0.11	0.12	0.12
MgO	46.50	48.69	47.15	47.43	46.26	47.56	45.30	46.02	46.57	46.64	47.41	46.27
CaO	0.59	0.63	0.75	0.92	0.86	0.49	1.82	0.95	0.53	0.77	0.73	0.71
Na₂O	0.09	0.07	0.08	0.06	0.05	0.11	0.10	0.10	0.15	0.04	0.08	0.07
K₂O	0.04	0.03	0.02	0.03	0.02	0.02	0.03	0.03	0.01	0.02	0.03	0.03
P₂O₅	0.03	0.01	0.04	0.01	0.06	0.06	0.01	0.06	0.04	0.06	0.01	0.01
Total:	100.00	100.00	100.85	101.60	100.57	100.25	99.72	100.77	100.20	101.03	101.92	100.22
Trace elements (ppm):
Sc	7.7	6.4	8.4	8.9	8.4	6.7	9.4	10.7	11.3	6.7	7.5	9.0
V	28.7	25.3	18.5	18.3	18.9	30.7	42.6	39.5	42.4	27.6	30.7	19.5
Cr	2487	3685	2897	2973	2660	2340	3170	2251	3193	2739	2977	2806
Ni	2342	2558	2524	2384	2464	2721	2403	2541	3339	2588	2503	2432
Sr	19.48	26.82	15.84	16.09	13.31	31.64	34.79	41.72	24.90	9.80	24.54	7.29
Y	1.5	2.2	0.7	2.1	0.4	0.9	1.7	0.5	0.7	0.6	2.1	0.5
Ba	4.8	2.8	3.3	3.4	7.5	8.2	5.6	12.8	6.8	7.6	3.7	10.7
Zr	0.4	2.8	3.8	2.0	1.8	0.3	2.0	0.5	1.9	1.8	2.5	2.3
LOI:	14.54	14.62	12.90	11.29	11.57	16.68	14.50	15.56	11.66	12.50	13.46	12.41
Estimated serpentine (%):	60	81	64	39		61	70		100		85	37
CIPW-normative minerals (wt%):
or	0.24	0.18	0.11	0.15	0.11	0.13	0.19	0.19	0.07	0.09	0.16	0.19
ab	0.79	0.61	0.65	0.48	0.42	0.89	0.84	0.86	1.24	0.38	0.68	0.57
di	2.13	2.42	2.73	3.55	3.04	1.61	7.06	3.41	1.89	2.71	2.79	2.70
hy	16.22	1.32	15.36	12.84	19.13	11.30	10.21	17.17	16.09	17.08	13.60	19.29
ol	78.44	93.11	79.90	82.13	75.45	83.94	78.87	76.63	79.06	78.23	82.23	75.25
mt	1.00	1.04	0.99	1.01	0.97	1.00	0.99	1.01	1.03	1.04	1.06	0.95
il	0.02	0.02	0.03	0.02	0.02	0.03	0.03	0.03	0.03	0.03	0.02	0.02
ap	0.08	0.02	0.09	0.02	0.15	0.14	0.02	0.14	0.09	0.13	0.02	0.03
Total:	98.91	98.74	99.86	100.22	99.30	99.03	98.22	99.44	99.52	99.70	100.57	99.01
Mg#:	92.34	92.35	92.50	92.37	92.47	92.51	92.20	92.16	92.10	92.08	92.05	92.63


	1200A									1200B
Core, section:	13R-1	13R-1	14R-1	16R-1	16R-1	16R-2	16R-2	16R-2	17G-2	1W-1	2W-2
Interval (cm): Piece:	25-27 6A	90-92 8B	22-24 6	112-114 11B	133-135 12	15-17 1	29-31 2	48-50 4	29-31 2	76-78 5B	2-6 1
Depth (mbsf):	108.95	109.60	118.52	138.72	138.93	139.10	139.24	139.43	Unknown	0.76	32.22
Rock type:	Dunite	Harzburgite	Harzburgite	Harzburgite	Harzburgite	Harzburgite	Harzburgite	Harzburgite	Harzburgite	Dunite	Harzburgite
Major element oxides (wt%):
SiO₂	41.34	43.26	42.81	42.86	43.85	44.63	43.22	44.21	44.23	41.67	42.95
TiO₂	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01
Al₂O₃	0.62	0.49	0.62	0.45	0.37	0.72	0.67	0.38	0.70	0.41	0.37
Fe₂O₃T	9.80	8.62	8.70	7.99	7.76	7.78	8.31	8.57	8.15	8.56	7.60
MnO	0.15	0.11	0.12	0.12	0.12	0.12	0.12	0.12	0.12	0.13	0.12
MgO	48.37	47.79	46.81	46.02	47.30	47.12	46.58	47.38	47.20	48.87	46.33
CaO	0.36	0.69	0.82	0.66	0.69	0.93	0.98	0.46	0.78	0.24	0.67
Na₂O	0.08	0.07	0.06	0.07	0.07	0.07	0.07	0.27	0.10	0.09	0.07
K₂O	0.02	0.03	0.03	0.02	0.02	0.03	0.03	0.03	0.03	0.01	0.02
P₂O₅	0.01	0.01	0.01	0.05	0.01	0.06	0.01	0.01	0.05	0.04	0.04
Total:	100.75	101.07	99.97	98.19	101.15	101.40	100.00	101.42	101.32	100.00	100
Trace elements (ppm):
Sc	7.7	7.7	7.6	7.3	7.2	8.8	9.6	8.9	8.1	8.8	9.6
V	29.5	22.8	19.5	25.6	22.9	19.3	19.4	27.9	32.0	27.2	16.6
Cr	2548	2564	2552	3810	2201	2427	2492	2661	3175	2178	2551
Ni	3706	2437	2580	2483	2761	2412	2524	2829	2673	2983	2879
Sr	18.92	23.70	18.20	21.57	18.01	17.10	16.97	24.23	29.36	12.66	7.90
Y	1.8	3.6	1.9	0.3	0.9	0.7	0.7	0.6	1.2	0.3	0.9
Ba	2.2	3.0	4.7	9.2	5.3	13.1	9.8	7.2	8.7	2.4	2.7
Zr	1.6	2.0	1.9	2.2	3.9	1.8	3.5	1.5	1.7	3.8	2.8
LOI:	18.19	14.48	14.00	15.56	15.94	12.02	13.05	15.96	14.89	16.04	11.42
Estimated serpentine (%):	48	79	62	83		58		100	83	100	72
CIPW-normative minerals (wt%):
or	0.09	0.15	0.16	0.13	0.10	0.18	0.16	0.16	0.16	0.09	0.09
ab	0.64	0.62	0.53	0.56	0.63	0.57	0.62	1.80	0.85	0.74	0.61
di	1.34	2.63	3.15	2.30	2.66	3.33	3.78	1.72	2.78	0.73	2.43
hy	3.26	10.80	11.11	15.30	15.04	17.16	12.41	12.76	15.33	5.16	14.97
ol	92.82	84.68	82.66	77.81	79.87	77.84	80.71	82.91	79.87	91.14	78.12
mt	1.17	1.03	1.04	0.96	0.93	0.93	0.99	0.81	0.98	1.03	0.91
il	0.02	0.02	0.02	0.02	0.02	0.02	0.02	0.02	0.03	0.02	0.02
ap	0.02	0.02	0.02	0.12	0.01	0.14	0.01	0.03	0.13	0.09	0.09
Total:	99.38	99.95	98.70	97.19	99.26	100.18	98.72	100.22	100.13	99.00	97.25
Mg#:	91.42	92.29	92.08	92.56	92.93	92.90	92.37	92.27	92.59	92.49	92.93

Notes: Element compositions were determined by inductively coupled plasma-atomic emission spectroscopy. LOI = loss on ignition. Mg# = 100 x Mg²⁺/(Mg²⁺+Fe²⁺). Calculated CIPW-normative compositions: or = norm orthoclase, ab = norm albite, di = norm diopside, hy = norm hyperthene, ol = norm olivine, mt = norm magnetite, il = norm ilmenite, ap = norm apatite.