Table 1 Specific features of the studied Fe(II)-oxidizing microbial mats from Lucky Strike Hydrothermal Field. For further details, see Supplementary discussion concerning the high positive δ13Ccarb values
Site | Year | Dive | Depth (mbsl) | Distance from diffuse hydrothermal vent (m) | Thickness (cm) | Mat type | Colours | Abundance of Zetaproteobacteria (%)† | Mineralogy of the mat | Substratum |
|---|---|---|---|---|---|---|---|---|---|---|
South Isabel | 2021 | 1998-10 | 1699 | No diffuse flow | - | Flocculent | orange-dark brown | 28.68 | Ferrihydrite, barite, opal-A? | Hydrothermal slab# |
N37° 17.336 W32° 16.628 | ||||||||||
West Sintra | 2021 | 1997-9 | 1669 | No diffuse flow | - | Flocculent | reddish brown | 44.95 | Si-ferrihydrite, ferrihydrite | Massive hydrothermal deposits dominated by pyrite and marcassite |
N37° 17.500 W32° 16.570 | ||||||||||
Lava Lake | 2021 | 2000-12 | 1741 | No vent | - | Flocculent | orange-yellowish brown | 33.21 | Si-ferrihydrite | Basalt |
N37° 17.549 W32° 16.790 | 2023 | 844-6 | 1738 | |||||||
Capelinhos | 2022 | 2035-8 | 1669 | Immediately below | 20 | Crumbly | orange-yellowish brown to reddish brown | 21.55 | Si-ferrihydrite | Hydrothermal slab# |
N37° 17.360 W32° 15.829 | 2023 | 844-6 | 1669 | |||||||
North Tour Eiffel | 2022 | 2033-6 | 1689 | <1 | <10 | Crumbly | orange-yellowish brown, brown, and black | 25.07 | Si-ferrihydrite, Mn oxides, anorthite, amphibole | Hydrothermal slab# composed of sphalerite, marcassite, and barite |
N37° 17.353 W32° 16.535 | ||||||||||
Y3 | 2022 | 2034-7 | 1727 | <1 | 10-15 | Crumbly | light brown to orange-brown | 11.69 | Ferrihydrite, goethite, lepidocrocite, akaganeite, magnetite, siderite, sulphurs | Hydrothermal gravitional deposits; aggregates of iron sulfide minerals and barite |
N37° 17.518 W32° 16.663 | 2023 | 846-8 | 1727 |
