Roger Revelle RR1507

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Departure date
2015-04-21
Departure port
Auckland, New Zealand
Arrival Date
2015-05-14
Arrival Port
Auckland, New Zealand
Spatial coverage
westlimit: 174.780425;southlimit: -36.843807;eastlimit : -176.126918;northlimit: -20.050752
Cruise Name
Geochemical effects on the functional microbial community dynamics of hydrothermal deposits along the Eastern Lau Spreading Center
Cruise ID
RR1507
R2R Cruise
https://www.rvdata.us/search/cruise/RR1507
Cruise DOI
https://doi.org/10.7284/901980
Vessel Name
Roger Revelle
Chief scientist
Reysenbach, Anna-Louise
Keywords

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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.