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Transcript 
sulfate
reducing
(SRB)
reactions
in the
saturated zone
water table
negligible
consumption
convection
O2
BIOSPHERE
infiltration
H2O
fixation
transportation
fixation as
organic C
convection
CO2
reducing
oxidizing
Eh
FIGURE 61. Biochemical and geochemical cycles in the supergene environment.
enriched
iron
oxidizing
(T.f.)
Bacteria
reactions
in the
vadose zone
leached
LITHOSPHERE
ATMOSPHERE
goethite
+
hematite
Iron
leached
Sulfur
near
neutral
5 to 6
pyrite
SO 4 2SRB
H 2S
Fe 2+
T.f.
low
soluble
Fe 3+ SO 422 to 4
neutral
6 to 8
pH
covelite
chalcocite
Cu 2+
soluble
leached
Copper
Biochemical And Geochemical Cycles In The Supergene Environment
296
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