Atlantis AT18-16

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Departure date
Departure port
Port Everglades, Florida
Arrival Date
Arrival Port
Port Everglades, Florida
Spatial coverage
westlimit: -85.1741367;southlimit: 17.88721665;eastlimit : -79.79631612;northlimit: 26.09347388
Cruise Name
Venting Outside the Box - Hydrothermal Circulation and Chemosynthetic Life
Cruise ID
Vessel Name
Chief scientist
German, Christopher

Search Results

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  • Thesis
    Trace element proxies and mineral indicators of hydrothermal fluid composition and seafloor massive sulfide deposit formation processes
    (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2017-06) Evans, Guy N. ; Reysenbach, Anna-Louise ; German, Christopher
    This thesis analyzes compositions of seafloor massive sulfide (SMS) deposits and related hydrothermal vent fluids to identify proxies of reaction zone conditions (host-rock lithology, hydrothermal fluid temperature and chemistry). Chapter 2 investigates the morphology, mineralogy, and geochemistry of SMS deposits from six vent fields along the Eastern Lau Spreading Center (ELSC), demonstrating that ELSC SMS deposits record differences in hydrothermal fluid temperature, pH, sulfur fugacity and host-rock lithology related to proximity to the nearby Tonga Subduction Zone. Chapters 3 and 4 focus on partitioning of Co, Ni, Ga, Ag, and In between hydrothermal vent fluids and chalcopyrite lining fluid conduits in black smoker chimneys. Chapter 3 develops secondary ion mass spectrometry (SIMS) as a technique to measure Co, Ni, Ga, Ag, and In in chalcopyrite and identifies a correlation between Ga and In in chalcopyrite and hydrothermal fluid pH. Chapter 4 presents new data on these elements in ELSC hydrothermal fluids that, combined with SIMS analyses of chalcopyrite chimney linings and previously published data on vent fluids from the Manus Basin, provide evidence that supports partitioning of Ag a lattice substitution for Cu. Together, concentrations of Ga, In, and Ag in chalcopyrite provide proxies of hydrothermal fluid pH and metal (i.e., Ag and Cu) contents.