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- W2186125045 abstract "One dredge haul from a young East Pacific Rise sqrmount, located approximately 15 km off-axis, recovered exclusively hydrothermal material that included massive sulfide, crusts consisting of euhedral drusy atacamite, and reddish brown iron oxide crusts and mud. The massive sulfide is primarily quartz, pyrite, and sphalerite, with accessory chalcopyrite, covellite, digenite, and galena; the sulfide fraction contains up to 2 ppm Au and 150 ppm Ag. Conditions of formation were estimated from fluid inclusions in quartz. Inclusion trapping temperatures were 240 + 35oC at the ambient seafloor pressure of 26 MPa, and the fluid had 4.0 wt.9o equivalent NaCl. The massive sulfide is atypical because it contains silica as quartz rather than an amorphous variety, suggesting that the usual kinetic barrier to quartz precipitation was overcome. Some of the quartz apparently replaced earlier amorphous silica, but much of it precipitated as primary quartz, entrapping fluid inclusions. Active hot springs on the seafloor that precipitate quartz have not been directly observed; however, these massive sulfides and other quartz-bearing samples from seafloor deposits suggest that subsurface diffuse flow and conductive heatloss may overcome the unfavorable kinetics of quartz precipitation." @default.
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- W2186125045 date "1991-09-01" @default.
- W2186125045 modified "2023-09-23" @default.
- W2186125045 title "Massive sulfides with fluid-inclusion-bearing quartz from a young seamount on the East Pacific Rise" @default.
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