• journal_title：Economic Geology
• Contributor：P. J. Murphy ; G. Meyer
• Publisher：Society of Economic Geologists
• Date：1998-
• Format：text/html
• Language：en
• Identifier：10.2113/gsecongeo.93.7.1076
• journal_abbrev：Economic Geology
• issn：0361-0128
• volume：93
• issue：7
• firstpage：1076
• section：Articles

Sulfide samples from the Logatchev hydrothermal field (14 degrees 45' N, Mid-Atlantic Ridge), which occurs on an ultramafic substrate, show a bimodal distribution of copper- and zinc-rich mineralogies, both of which have elevated gold contents. The copper-rich vents show an unusual depression,hosted morphology with few chimney structures. Copper-rich samples show evidence for a primary gold-copper association, as well as gold concentration during small-scale replacement and reworking processes. Evidence from vent morphologies, Au/Ag ratios, and sulfidation state suggest that, in the copper-rich samples, gold was not transported as Au(HS) (super -) ₂ .