1991 "Proto-chimney"
Anhydrite-dominated
T = 389 ˚ -403 ˚ C
Stage 2
1992-1995
CuFe-sulfide-dominated
T = 340 ˚ -392 ˚ C
1992-1995
Zn-sulfide-dominated
T = 264 ˚ -340 ˚ C
KEY
an _ anhydrite
cp _ chalcopyrite
po _ pyrrhotite
py _ pyrite
Morphological and Mineralogical Evolution of Chimneys
on the East Pacific Rise at 9 ˚ -10 ˚ N
Stage 2
378 HYDROTHERMAL VENT DEPOSITS