Compositions, growth mechanisms, and temporal relations of hydrothermal sulfide-sulfate-silica chimneys at the northern Cleft segment, Juan de Fuca Ridge Article

Koski, RA, Jonasson, IR, Kadko, DC et al. (1994). Compositions, growth mechanisms, and temporal relations of hydrothermal sulfide-sulfate-silica chimneys at the northern Cleft segment, Juan de Fuca Ridge . JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES, 99(B3), 4813-4832. 10.1029/93JB02871

cited authors

  • Koski, RA; Jonasson, IR; Kadko, DC; Smith, VK; Wong, FL

authors

abstract

  • Three active hydrothermal vents forming sulfide mounds and chimneys and more widely distributed inactive chimneys are spatially related to a system of discontinuous fissures and young sheet flow lavas at the northern Cleft segment, Juan de Fuca Ridge. The formation of zoned tubular Cu-rich chimneys (type I) on the Monolith sulfide mound is related to focused flow of high-temperature (to 328°C) fluid. Bulbous chimneys (type II or "beehives') at the Monolith and Foundation vents are products of diffuse high-temperature (to 315°C) discharge. Columnar Zn-sulfide-rich chimneys with narrow channelways (type III) are constructed where focused and relatively low-temperature (261°C) fluid vents directly from the basalt substrate. The bulk chemistry, mineralogy, textures, and oxygen isotope characteristics of inactive (type IV) chimneys indicate a low-temperature (<250°C) origin involving diffuse and sluggish flow patterns and conductive cooling. -from Authors

publication date

  • January 1, 1994

published in

Digital Object Identifier (DOI)

start page

  • 4813

end page

  • 4832

volume

  • 99

issue

  • B3