Table 2.

Measured volatile species abundances and isotope values in mixing zones at the Piccard vent field

Vent (year)/sample*	ΣH2S, mm	δ34SH2S, ‰	H2, mm	ΣCO2, mm	CH4, μm	C2H6, nm	C3H8, nm	n-C4H10, nm	i-C4H10, nm	δ13CCH4, ‰	δ13CC2H6, ‰	δ13CC3H8, ‰
Beebe endmember†	11.7	6.1	19.4	25.7	121	13	7.6	1.9	1.3	−23.9	−24.9	−
Hot Chimlet 1 (2012)
J2-619-IGT6	2.47	6.6	1.94	9.09	51.2	43	28	9.0	9.7	−28.4	−33.3	−29.7
J2-619-IGT3	2.60	—	2.06	10.1	56.5	92	66	27	11	−29.9	−33.5	−28.2
Hot Chimlet 1 (2013)
N59-IGT6	1.47	—	0.027	—	39.6	27	22	5.4	5.2	—	—	—
N59-IGT4	0.086	—	0.010	—	9.78	—	—	—	—	—	—	—
Hot Chimlet 3 (2013)
N62-IGT8	0.45	—	0.13	—	23.0	—	—	—	—	—	—	—
N62-IGT7	2.03	—	0.45	—	64.3	36	28	7.3	7.7	—	−36.9	−29.5
Hot Chimlet 2 (2012)
J2-620-IGT4	1.04	—	0.68	4.89	21.8	17	11	4.3	3.4	−29.2	—	—
J2-620-IGT8	0.96	—	0.52	4.08	15.6	11	8.3	3.1	<1.0	—	—	—
Shrimp Gulley 1 (2012)
J2-620-IGT1	1.95	—	0.40	5.95	24.0	14	9.7	3.8	1.6	—	—	—
J2-620-IGT2	1.12	—	0.28	5.56	20.5	12	7.3	2.7	<1.0	—	—	—
Shrimp Gulley 3 (2013)
N63-IGT6	0.49	—	<0.002	—	19.4	—	—	—	—	—	—	—
Shrimp Gulley 2 (2012)
J2-618-IGT1	0.83	—	0.11	3.39	10.8	5.1	—	1.6	<1.0	—	—	—
J2-618-IGT3	0.84	—	0.13	3.64	10.9	5.1	4.0	1.8	<1.0	—	—	—
Bottom seawater	0	—	0	2.21	0	0	0	0.0	0	—	—	—

^*Jason (J2) or Nereus (N##) dive number and isobaric gas-tight sampler number (-IGT).

^†Average high-temperature vent endmember [for Beebe 1, 3, 5, and Beebe Woods; McDermott et al. (25)]. See McDermott et al. (25) for IGT data from high-temperature fluid samples.