Chemistry of sulfide deposits from ODP Site 106-649, supplement to: Kase, Katsuo; Yamamoto, Masahiro; Shibata, Tsugio (1990): Copper-rich sulfide deposit near 23°N, Mid-Atlantic ridge: chemical composition, mineral chemistry, and sulfur isotopes. In: Detrick, R; Honnorez, J; Bryan, WB; Juteau, T; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 106/109, 163-177

Katsuo Kase, Masahiro Yamamoto & Tsugio Shibata
In Snake Pit massive sulfide fragments and friable, unconsolidated material recovered during ODP Leg 106, isocubanite and pyrite are generally the predominant phases, followed by marcasite, chalcopyrite, sphalerite, and pyrrhotite. Detailed analyses of paragenetic relations of minerals indicate that isocubanite first precipitated together with pyrrhotite. With decreasing temperature, chalcopyrite and sphalerite precipitated, and at the latest stage colloform sphalerite-pyrite (or colloform marcasite) formed. Isocubanite usually has exsolution lamellae of chalcopyrite and less commonly of pyrrhotite.The...
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