Geoscience Reference
In-Depth Information
Figure 1.4 Major processes during the hydrothermal circulation of seawater through the
oceanic crust at mid-ocean ridges.
Source: Courtesy of H.W. Jannasch
[98]
.
Nephloid layer (?)
Seawater input
Bacterial
productivity
H
2
S, Fe
2+
CH
4
, CO, H
2
, Mn
2+
O
2
, NO
-
, SO
2-
, PO
3+
Water column
CH
4
, CO
Mn
2+
, H
2
Vent and chimney
water
H
2
S, Fe
2+
All surfaces,
endosymbionts,
gut organisms
Fe
3+
,Mn
4+
oxides,
and sulfides
Crust
Figure 1.5 Microbial community
[88]
.
