Chemistry of sulfide deposits from ODP Site 106-649

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...

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Bibliographic Details
Main Authors: Kase, Katsuo, Yamamoto, Masahiro, Shibata, Tsugio
Format: Other/Unknown Material
Language:English
Published: PANGAEA 1990
Subjects:
106-648
106-648B
106-649
106-649B
106-649G
COMPCORE
Composite Core
DRILL
Drilling/drill rig
Joides Resolution
Leg106
North Atlantic Ocean
Ocean Drilling Program
ODP
Pacific
North Atlantic
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.745376
https://doi.org/10.1594/PANGAEA.745376
Description
Summary: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 average bulk chemical composition of the friable, unconsolidated material indicates that it is rich in copper, reflecting the dominance of isocubanite in the specimens, and is characterized by high Co, low Pb, and Ag contents. Sulfur isotope ratios are very uniform, ranging in d34S from +1.2 to +2.8 per mil. The obtained values are apparently low, compared to those for the eastern Pacific sulfide samples, reflecting a smaller contribution of seawater sulfate in the Snake Pit sulfide deposit.

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