Table 2.

Major Element Concentrations of Rock Samples, Divided into Analyses of Material From the Inner Fluid Conduits (Used for Microbial Culturing), Outer Chimney Walls and Total Bulk Composition^a

	Analytical Methodb	Bastille			Dante			Hot Harold
		Inner	Outer	Bulk Sample	Inner	Outer	Bulk Sample	Inner	Bulk sample
Fe%	INAA	33.00	33.10	31.50	0.73	38.60	3.86	19.10	0.91
Cu%	ICP-OES	10.00	2.18	4.64	0.11	0.48	1.18	0.33	0.09
Zn%	ICP-OES	2.03	6.31	3.33	0.68	0.44	0.20	0.83	1.29
S%	IR (Leco)	40.2	43.4	40.2	25.7	40.5	27.4	34.1	25.6
SiO2%	ICP-OES	4.62	6.93	3.29	0.24	0.26	0.19	<0.02	0.90
Ba%	INAA	0.48	0.42	0.40	0.09	0.01	0.03	0.04	0.07
Al2O3%	ICP-OES	1.47	0.34	0.45	0.02	0.06	0.02	<0.02	0.02
Pb%	ICP-MS	0.03	0.06	0.04	0.01	0.03	0.00	0.02	0.01
CaO%	ICP-OES	0.10	<0.01	4.88	39.46	7.82	37.22	24.91	38.90
MgO%	ICP-OES	0.05	<0.02	0.02	0.15	0.18	0.07	<0.02	0.5
Na2O%	ICP-OES	0.53	0.08	0.22	0.67	0.89	0.27	0.47	0.54
Totalc		92.5	92.8	89.0	67.9	89.3	70.4	79.8	68.8

^aThe results are reported in concentrations of elemental and oxide weight percent (wt %).

^bINAA, Instrumental Neutron Activation Analysis; ICP-OES, Inductively Coupled Plasma-Optical Emission Spectroscopy; IR, Infrared Detection; ICP-MS, Inductively Coupled Plasma-Mass Spectrometry.

^cLow totals are largely attributed to the exclusion of sulfate-bonded oxygen in the analyses.