Table 3.

Selected physical parameters and chemical compositions of hydrothermal fluid specimen.

ID	Sample	Vent field	Hydrothermal activity	Tmax	pH	EM	Salinity	Eh	H2S	Mg	Cl	Si	Fe	Mn	Cu	Zn
				°C	at 25°C	[%]	[‰]	mV	μM	mM	mM	mM	μM	μM	μM	μM
F1	040ROPOS-KIPS-C	VF 4	Diffuse shimmering water from beehive	14	7.33	4.96	32.9	–133	< 10	51.11	n.a.	0.94	44.70	16.48	b.d.	0.06
F2	083ROPOS-KIPS-A	VF 1	Diffuse, clear fluid	31	6.5	10.44	32.3	−251	60	48.16	498.97	1.91	9.44	8.31	b.d.	0.02
F3	104ROPOS-KIPS-C/D	VF 2	Diffuse, shimmering water	11,6	7.49	5.49	33.2	−150	23.5	50.83	514.02	0.28	1.29	0.34	0.004	0.01
F4	106ROPOS-KIPS-B	VF 2	Diffuse, shimmering water	< 10	7.27	6.01	33.8	−231	15	50.55	535.02	0.35	n.a.	0.44	b.d.	0.03
	Bottom seawater			1.8	7.74	0	31.1	27	0	53.60	532.08	0.01	<1.20	0.61	<0.002	0.02

It should be noted that hydrothermal fluids generally contain a significant amount of entrained seawater, as indicated by the hydrothermal endmember proportions (EM). Thus, the presented fluid data reflects compositions of hydrothermal fluid mixed with seawater. b.d.: below the limit of detection, n.a., data not available.