Table 2. Elemental composition of the rock varnish on the Big Pine volcanic field basalts at Aberdeen, CA, as measured by fs-LA-ICPMS (in μg g^-1).

The standard deviations reflect mostly the variability of trace elements in the varnish and not the analytical error, which is of the order of 2–6% for the elements measured.

Element	CLS-04 (n = 35)		CLS-05 (n = 30)		CLS-06 (n = 112)
	Average	Std. Dev.	Average	Std. Dev.	Average	Std. Dev.
B	52	84	78	38	87	130
Na	17900	5800	19100	11100	10000	3400
Mg	30100	14100	20800	10900	24600	9600
Al	88300	19900	72900	11100	92500	11800
Si	182000	22000	163000	30000	171000	18000
P	3600	1500	2900	800	4600	2000
K	7300	4900	21700	9700	8900	8500
Ca	83400	20400	43400	19900	52900	19400
Ti	11000	2300	14100	5700	13300	2700
Mn	31100	7900	79300	51200	47200	17700
Fe	104000	32000	133000	33000	135000	31000
Co	271	103	506	311	305	125
Ni	40	60	119	55	71	73
Rb	18.8	15.2	88	37	44	26
Sr	1300	500	1100	400	800	300
Y	47	20	97	42	71	18
Cs	2.2	2.3	8.1	5.3	6.0	4.9
Ba	3100	800	10200	6800	4200	2300
La	100	34	250	158	146	48
Ce	570	156	2593	2112	1251	485
Pr	25	8	56	30	35	11
Nd	93	40	190	98	129	45
Sm	20	13	33	19	26	10
Eu	5.6	6.7	7.1	2.8	5.1	2.3
Gd	14.4	13.6	24.2	11.7	20.3	9.5
Tb	2.3	2.2	3.6	1.7	3.0	1.4
Dy	12.5	9.8	18.8	10.7	17.2	7.3
Ho	2.1	1.5	3.6	1.6	3.0	1.3
Er	6.6	6.4	11.1	5.9	11.4	6.0
Tm	1.2	1.3	1.2	0.9	1.3	0.8
Yb	6.1	5.4	11.8	6.8	9.3	5.6
Lu	1.4	2.6	1.7	0.8	1.3	0.8
Pb	1500	1200	1100	1000	3300	2600
Th	78	62	148	76	154	73
U	38	17	66	39	92	34
Zr	362	135	501	185	407	113
Cu	230	139	249	122	1096	2711
Cr	72	72	56	59	164	237
Zn	138	215	391	253	455	388
V	214	72	470	108	334	90