Geochemically induced shifts in catabolic energy yields explain past ecological changes of diffuse vents in the East Pacific Rise 9°50'N area

Hentscher, Michael; Bach, Wolfgang

doi:10.1186/1467-4866-13-2

Table 1 Compositions of discrete and diffuse vent fluids

From: Geochemically induced shifts in catabolic energy yields explain past ecological changes of diffuse vents in the East Pacific Rise 9°50'N area

		Temperature (°C)	pH _(25°C) (1)	in situ pH	Mg²⁺ mM	Na⁺ mM (1)	Cl⁺ mM	SiO₂ (aq) mM	H₂ (aq) μM	H₂S (aq) mM	Fe²⁺ μM	CH₄ (aq) μM	CO₂ (aq) mM	O₂ (aq) μM (5)	SO₄^2- mM (1, 6)	% hydrothermal fluid (4)
	Seawater	1.8	7.8	8.1	52.2	464	540	0.155	0	0	0	0	2.30	100	28.2	0
Northern Area
April 1991	hot endmember	368	2.6	3.2	0	139	154	9.90	3030	23.2	2190	172	44.8	-	0	100
	diffuse, measured	22	-	-	49.7	-	530	0.88	0.36	0.90	151	0.070	5.90	-	-	7.39
	diffuse, calculated	22	5.7	5.7	48.3	440	511	0.88	225	1.72	162	12.8	5.46	92.6	26.1	7.39
December 1993	hot endmember	365	3.6	5.7	0	188	212	11.3	700	7.30	1060	1000	204	-	0.18	100
	diffuse, measured	30.9	-	-	49.6	-	522	0.57	0.33	0.28	24.2	5.80	9.57	-	-	3.68
	diffuse, calculated	30.9	5.5	5.5	50.3	454	528	0.57	25.9	0.27	39.3	37.1	9.77	96.3	27.2	3.68
March 1994	hot endmember	363	3.5	5.1	0	222	249	12.6	680	8.50	1430	112	187	-	0.035	100
	diffuse, measured	29.9	-	-	50.4	-	525	0.79	1.90	0.27	25.0	6.58	9.57	-	-	5.06
	diffuse, calculated	29.9	5.4	5.4	49.6	452	525	0.79	34.5	431	72.5	5.68	11.7	94.9	26.8	5.06
October 1994	hot endmember	364	3.2	3.8	0	279	325	14.1	530	6.20	2730	86.0	146	-	1.55	100
	diffuse, measured	32.3	-	-	48.1	-	524	0.92	6.79	0.11	69.9	4.83	8.54	-	-	5.45
	diffuse, calculated	32.3	5.5	5.4	49.3	454	528	0.92	29.2	0.34	150	4.74	10.2	94.5	26.7	5.45
November 1995	hot endmember	366	3.0	3.9	0	391	466	14.8	360	6.70	6030	84.0	139	-	0	100
	diffuse, measured	33.3	-	-	46.3	-	550	1.14	2.50	0.19	277	5.37	9.01	-	-	6.69
	diffuse, calculated	33.3	5.4	5.3	48.7	459	535	1.14	24.2	0.45	406	5.65	11.5	93.3	26.3	6.69
November 1997	hot endmember	373	3.1	4.1	0	342	400	13.4	330	8.60	6640	95.0	117	-	0	100
	diffuse, measured	27.2	-	-	50.5	-	534	0.72	0.75	0.003	170	2.52	4.70	-	-	4.23
	diffuse, calculated	27.2	5.7	5.7	50.0	459	534	0.72	14.1	0.37	284	4.07	7.21	95.7	27.0	4.23
Southern Area
April 1991	diffuse, measured	55	-	-	46.7	-	504	1.95	2.17	8.46	2.40	505	10.1	-	-	-
February-March	hot endmember	160	3 (2)	3.7	0	126 (3)	136	12.7	6460	20.7	4080	213	31.0	-	-	100
1992	diffuse, measured	23.3	-	-	48.2	-	529	0.69	14.9	0.66	2.00	94.0	4.57	-	-	4.28
	diffuse, calculated	23.3	6.2	6.2	50.0	479	523	0.69	277	0.89	175	9.12	3.53	95.7	27.0	4.28
December 1993	diffuse, measured	15.4	-	-	50.5	-	532	0.23	0.13	0.001	9.20	2.87	2.70	-	-	-
March 1994	hot endmember	20.5	-	-	0	-	269	5.57	8910	11.2	200	748	118	-	-	100
October 1994	hot endmember	351	3 (2)		0	229 (3)	235	12.5	8390	14.3	1590	116	104	-	-	100
	diffuse, measured	20.4	-	-	49.7	-	526	0.66	6.75	0.21	11.5	15.6	4.96	-	-	4.05
	diffuse, calculated	20.4	-	5.8	50.1	484	528	0.66	343	0.58	65.0	4.74	6.46	95.9	27.0	4.05
November 1995	hot endmember	341	3 (2)	3.7	0	297 (3)	301	13.8	4930	14.0	1550	106	95.7	-	-	100
	diffuse, measured	24.7	-	-	50.3	-	531	0.85	0.75	0.53	9.90	15.9	5.80	-	-	5.06
	diffuse, calculated	24.7	5.7	5.7	49.5	484	528	0.85	250	0.71	78.7	5.38	7.04	94.9	26.8	5.06
November 1997	hot endmember	307	3 (2)	3.4	0	326 (3)	330	16.1	3550	11.3	742	121	81.9	-	-	100
	diffuse, measured	18.2	-	-	51.5	-	530	0.57	0.67	0.24	27.0	4.09	3.84	-	-	2.57
	diffuse, calculated	18.2	6.0	6.1	50.9	490	535	0.57	91.3	0.29	19.1	3.11	4.35	97.4	27.5	2.57
April 2000	hot endmember	279	3 (2)	3.3	0	355 (3)	359	16.8	2700	11.2	517	108	77.0	-	-	100
	diffuse, measured	11.9	-	-	50.4	-	529	0.23	0.15	0.055	23.0	0.47	2.57	-	-	0.42
	diffuse, calculated	11.9	7.0	6.9	52.0	494	539	0.23	12.5	0.051	2.39	0.50	2.65	99.5	28.1	0.42

Fluid data for high temperature fluids and measured diffuse fluids are from Von Damm and Lilley, 2004 [13]
Northern Area: Hot vent fluids are from Bio9 and Bio9' and the associated diffuse fluids from BM9Rifia, BM91o and BM12
Southern Area: High temperature fluids are from Tube Worm Pillar (TWP) and the diffuse fluids from Y vent at the base of TWP
(1) pH, sodium and sulfate concentrations of vent fluids are from Von Damm [14], unless otherwise indicated
(2) pH was not measured but is approximated by comparison with similar vent fluids from Von Damm [14]
(3) Na⁺ calculated by charge balance
(4) Calculated assuming conservative behavior of SiO₂(aq)
(5) O₂(aq) in diffuse fluids was calculated from conservative mixing, assuming 100 μMol O₂ for pacific bottom seawater [30]
(6) When sulfate concentrations are not reported, it is assumed to be zero in the endmember vent fluids

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ISSN: 1467-4866

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