Structural Controls on Shallow Cenozoic Fluid Flow in the Otago Schist, New Zealand

Table 2

Whole-rock major and trace element geochemistry of greyschist, altered greyschist, and hydrothermal breccia from Bruce Rocks.

Lithology	Greyschist			Altered greyschist				Hydrothermal breccia
Sample	BRWR-1	BRWR-2	BRWR-3	BRWR-4A	BRWR-4B	BRWR-5	BRWR-6	BRWR-7	BRWR-8
SiO2 (wt.%)	67.94	64.57	69.86	40.85	41.73	53.09	49.00	40.74	37.93
TiO2	0.79	0.78	0.59	0.45	0.59	0.39	0.65	0.44	0.25
Al2O3	16.23	17.35	13.40	8.57	11.06	9.76	12.34	9.54	6.20
Fe2O3	3.00	3.54	3.33	7.60	7.05	4.00	5.14	4.74	3.86
CaO	0.43	0.75	1.30	15.50	13.85	10.85	10.10	18.60	22.90
MgO	1.12	1.38	1.17	3.43	3.10	2.96	2.78	2.03	2.58
MnO	0.04	0.05	0.05	0.14	0.13	0.08	0.11	0.20	0.33
Na2O	3.63	4.06	3.91	2.23	2.91	3.01	3.54	2.67	0.33
K2O	2.72	2.88	1.72	1.12	1.48	1.32	1.72	1.17	1.88
LOI	3.75	4.37	4.26	19.02	17.18	13.67	13.14	18.90	22.32
Total	99.65	99.73	99.59	98.91	99.08	99.13	98.52	99.03	98.58
Ba (ppm)	662	686	392	292	363	340	437	280	555
Ce	38	45	40	52	45	25	35	23	29
Cr	20	20	10	10	10	10	20	10	20
Cs	3.28	3.30	1.95	1.37	1.61	1.66	2.17	3.51	6.20
Dy	2.64	2.80	2.70	8.28	6.72	4.30	4.09	3.16	2.85
Er	1.72	1.61	1.40	4.84	4.01	2.72	2.55	2.22	1.78
Eu	0.91	1.13	1.11	2.04	1.65	1.04	1.14	0.77	0.53
Ga	21	21	15	11	13	11	15	10	8.70
Gd	3.03	3.49	3.33	7.28	5.81	3.75	3.82	2.77	2.74
Hf	6.30	5.50	4.30	2.80	3.70	3.00	4.10	3.00	2.10
Ho	0.57	0.56	0.48	1.74	1.40	0.96	0.86	0.74	0.61
La	18	21	19	28	24	14	18	13	14
Lu	0.26	0.23	0.19	0.56	0.42	0.34	0.34	0.23	0.26
Nb	7.60	7.50	5.30	3.80	4.90	3.40	5.10	3.60	4.50
Nd	18	21	20	27	23	13	17	12	13
Pr	4.60	5.32	4.98	6.54	5.45	2.93	4.10	2.74	3.16
Rb	94	97	55	38	47	45	59	36	73
Sm	3.33	4.22	3.83	5.91	5.24	2.86	3.44	2.41	2.60
Sn	2.00	2.00	1.00	1.00	1.00	1.00	2.00	1.00	1.00
Sr	43	63	93	652	563	469	364	296	350
Ta	0.60	0.60	0.40	0.30	0.40	0.30	0.40	0.30	0.30
Tb	0.41	0.50	0.48	1.16	0.99	0.65	0.64	0.43	0.45
Th	8.59	9.10	6.99	4.48	4.90	3.71	5.34	3.96	5.60
Tm	0.26	0.22	0.18	0.66	0.52	0.43	0.36	0.27	0.27
U	1.43	1.81	1.38	1.33	1.14	1.49	0.90	0.60	1.95
V	105	100	75	66	80	52	85	57	53
W	2.00	2.00	2.00	1.00	2.00	2.00	1.00	1.00	1.00
Y	15	14	13	53	43	34	30	27	28
Yb	1.80	1.74	1.42	4.15	3.27	2.49	2.29	1.64	1.73
Zr	233	200	150	103	137	119	167	117	76