@article {Findlay2015,
	title = {{Trace metal concentration and partitioning in the first 1.5 m of hydrothermal vent plumes along the Mid-Atlantic Ridge: TAG, Snakepit, and Rainbow}},
	journal = {Chemical Geology},
	volume = {412},
	year = {2015},
	pages = {117{\textendash}131},
	abstract = {To determine the significance of metal fluxes from hydrothermal vents, understanding the speciation, reactivity, and possible transformations of metals and metal sulfides within the hydrothermal plume is critical. In this study, we measure the concentration and partitioning of trace metals (Fe, Mn, Cu, Cd, Co, Pb, Ni) and sulfide phases within the first 1.5 m of the rising plume at three vent fields (TAG, Snakepit, and Rainbow) along the Mid-Atlantic Ridge. A HCl/HNO3 leaching method was used to differentiate metals present in metal mono-sulfides from those in pyrite and chalcopyrite. At all three vent sites, Mn and Fe are primarily in the {\textless} 0.2 $μ$m (filtered) portion, whereas Cu, Co, Cd, and Pb are mainly in the unfiltered fraction. Significant concentrations of HNO3-extractable metals were found in the {\textless} 0.2 $μ$m fraction at all three vent sites, indicating that they likely exist in a recalcitrant nanoparticulate phase such as pyrite or chalcopyrite. At TAG and Snakepit, Cu is correlated with Co, as Co enters into chalcopyrite and other CuFeS phases and Zn is correlated with Cd and Pb as they form discrete metal sulfide phases. At Rainbow, Zn, Cd, and Pb are correlated, but Cu and Co are not correlated. The Rainbow data are consistent with the higher metal to sulfide ratio found at Rainbow. These speciation differences are significant as both mineral type and size will affect the amount of metal transported from the vent site and its availability for biogeochemical processes.},
	keywords = {ROV Jason (Remotely Operated Vehicle)},
	doi = {10.1016/j.chemgeo.2015.07.021},
	author = {Findlay, A J and Gartman, A and Shaw, T J and Luther, G W}
}
@article {Yuecel2013,
	title = {{Temporal trends in vent fluid iron and sulfide chemistry following the 2005/2006 eruption at East Pacific Rise, 9 degrees 50 {\textquoteright} N}},
	journal = {Geochemistry, Geophysics, Geosystems},
	volume = {14},
	number = {4},
	year = {2013},
	pages = {759{\textendash}765},
	abstract = {The chemistry of vent fluids that emanate to the seafloor undergoes dramatic changes after volcanic eruptions. Data on these changes are still limited, but the best studied example is the East Pacific Rise (EPR) at 9{\textdegree}50'N, where the temporal evolution of the vent fluid chemistry after the 1991/1992 eruption was documented. The area underwent another eruption sequence during late 2005/early 2006, and here we show that a similar evolution is recurring in the iron and sulfide contents of the high-temperature fluids sampled in June 2006, January 2007, and June 2008. The vents have had increasing dissolved iron and decreasing acid-volatile sulfide (free sulfide plus FeS) concentrations with 1 order of magnitude variation. In addition, chromium reducible sulfide (mainly pyrite) also had fivefold decreasing concentrations over the 3 years. Our results confirm a pattern that was noted only once before for 9{\textdegree}50'N EPR and emphasize the dramatic yearly variability in the concentrations of iron-sulfur species emanating from vents.},
	keywords = {HOV Alvin (Human Occupied Vehicle)},
	issn = {1525-2027},
	doi = {10.1002/ggge.20088},
	author = {Yuecel, M and Luther, G W}
}
@article {Luther2011,
	title = {{Thermodynamics and kinetics of sulfide oxidation by oxygen: a look at inorganically controlled reactions and biologically mediated processes in the environment}},
	journal = {Frontiers in Microbiology},
	volume = {2},
	year = {2011},
	pages = {62},
	publisher = {FRONTIERS RESEARCH FOUNDATION},
	address = {LAUSANNE; PO BOX 110, LAUSANNE, 1015, SWITZERLAND},
	abstract = {The thermodynamics for the first electron transfer step for sulfide and oxygen indicates that the reaction is unfavorable as unstable superoxide and bisulfide radical ions would need to be produced. However, a two-electron transfer is favorable as stable S(0) and peroxide would be formed, but the partially filled orbitals in oxygen that accept electrons prevent rapid kinetics. Abiotic sulfide oxidation kinetics improve when reduced iron and/or manganese are oxidized by oxygen to form oxidized metals which in turn oxidize sulfide. Biological sulfur oxidation relies on enzymes that have evolved to overcome these kinetic constraints to affect rapid sulfide oxidation. Here we review the available thermodynamic and kinetic data for H2S and HS center dot as well as O-2, reactive oxygen species, nitrate, nitrite, and NOx species. We also present new kinetic data for abiotic sulfide oxidation with oxygen in trace metal clean solutions that constrain abiotic rates of sulfide oxidation in metal free solution and agree with the kinetic and thermodynamic calculations. Moreover, we present experimental data that give insight on rates of chemolithotrophic and photolithotrophic sulfide oxidation in the environment. We demonstrate that both anaerobic photolithotrophic and aerobic chemolithotrophic sulfide oxidation rates are three or more orders of magnitude higher than abiotic rates suggesting that in most environments biotic sulfide oxidation rates will far exceed abiotic rates due to the thermodynamic and kinetic constraints discussed in the first section of the paper. Such data reshape our thinking about the biotic and abiotic contributions to sulfide oxidation in the environment.},
	keywords = {ROV Jason (Remotely Operated Vehicle)},
	issn = {1664-302X},
	doi = {10.3389/fmicb.2011.00062},
	author = {Luther, G W and Findlay, A J and MacDonald, D J and Owings, S M and Hanson, T E and Beinart, R A and Girguis, P R}
}
@article {Moore2009,
	title = {{Time-series chemical and temperature habitat characterization of diffuse flow hydrothermal sites at 9 degrees 50'N East Pacific Rise}},
	journal = {Deep-Sea Research. Part II: Topical Studies in Oceanography},
	volume = {56},
	number = {19-20},
	year = {2009},
	pages = {1616{\textendash}1621},
	keywords = {HOV Alvin (Human Occupied Vehicle)},
	issn = {0967-0645},
	doi = {10.1016/j.dsr2.2009.05.008},
	url = {http://dx.doi.org/10.1016/j.dsr2.2009.05.008},
	author = {Moore, T S and Shank, T M and Nuzzio, D B and Luther, G W}
}
