@article {Tontini2016,
	title = {{Crustal magnetization and the subseafloor structure of the ASHES vent field, Axial Seamount, Juan de Fuca Ridge: Implications for the investigation of hydrothermal sites}},
	journal = {Geophysical Research Letters},
	volume = {43},
	year = {2016},
	pages = {6205{\textendash}6211},
	abstract = {High-resolution geophysical data have been collected using the Autonomous Underwater Vehicle (AUV) Sentry over the ASHES (Axial Seamount Hydrothermal Emission Study) high-temperature ({\~{}}348{\textdegree}C) vent field at Axial Seamount, on the Juan de Fuca Ridge. Multiple surveys were performed on a 3-D grid at different altitudes above the seafloor, providing an unprecedented view of magnetic data resolution as a function of altitude above the seafloor. Magnetic data derived near the seafloor show that the ASHES field is characterized by a zone of low magnetization, which can be explained by hydrothermal alteration of the host volcanic rocks. Surface manifestations of hydrothermal activity at the ASHES vent field are likely controlled by a combination of local faults and fractures and different lava morphologies near the seafloor. Three-dimensional inversion of the magnetic data provides evidence of a vertical, pipe-like upflow zone of the hydrothermal fluids with a vertical extent of {\~{}}100 m.},
	keywords = {AUV Sentry (Autonomous Underwater Vehicle)},
	doi = {10.1002/2016GL069430},
	author = {Tontini, F C and Crone, T J and de Ronde, C E J and Fornari, D J and Kinsey, J C and Mittelstaedt, E and Tivey, M K}
}
@article {Teske2016,
	title = {{The Guaymas Basin Hiking Guide to Hydrothermal Mounds, Chimneys, and Microbial Mats: Complex Seafloor Expressions of Subsurface Hydrothermal Circulation}},
	journal = {Frontiers in Microbiology},
	volume = {7},
	year = {2016},
	pages = {75},
	abstract = {The hydrothermal mats, mounds, and chimneys of the southern Guaymas Basin are the surface expression of complex subsurface hydrothermal circulation patterns. In this overview, we document the most frequently visited features of this hydrothermal area with photographs, temperature measurements, and selected geochemical data; many of these distinct habitats await characterization of their microbial communities and activities. Microprofiler deployments on microbial mats and hydrothermal sediments show their steep geochemical and thermal gradients at millimeter-scale vertical resolution. Mapping these hydrothermal features and sampling locations within the southern Guaymas Basin suggest linkages to underlying shallow sills and heat flow gradients. Recognizing the inherent spatial limitations of much current Guaymas Basin sampling calls for comprehensive surveys of the wider spreading region.},
	keywords = {HOV Alvin (Human Occupied Vehicle)},
	doi = {10.3389/fmicb.2016.00075},
	author = {Teske, A P and de Beer, D and McKay, L J and Tivey, M K and Biddle, J F and Hoer, D R and Lloyd, K G and Lever, M A and Roy, H and Albert, D B and Mendlovitz, H P and MacGregor, B J}
}
@article {McDermott2015,
	title = {{Identification of sulfur sources and isotopic equilibria in submarine hot-springs using multiple sulfur isotopes}},
	journal = {Geochimica et Cosmochimica Acta},
	volume = {160},
	year = {2015},
	pages = {169{\textendash}187},
	abstract = {Multiple sulfur isotopes were measured in metal sulfide deposits, elemental sulfur, and aqueous hydrogen sulfide to constrain sulfur sources and the isotopic systematics of precipitation in seafloor hydrothermal vents. Areas studied include the Eastern Manus Basin and Lau Basin back-arc spreading centers and the unsedimented basalt-hosted Southern East Pacific Rise (SEPR) and sediment-hosted Guaymas Basin mid-ocean ridge spreading centers. Chalcopyrite and dissolved hydrogen sulfide (H2S) $δ$34S values range from -5.5{\textperthousand} to +5.6{\textperthousand} in Manus Basin samples, +2.4{\textperthousand} to +6.1{\textperthousand} in Lau Basin samples, and +3.7{\textperthousand} to +5.7{\textperthousand} in SEPR samples. Values of $δ$34S for cubic cubanite and H2S range from -1.4{\textperthousand} to +4.7{\textperthousand} in Guaymas Basin samples. Multiple sulfur isotope systematics in fluid-mineral pairs from the SEPR and Lau Basin show that crustal host rock and thermochemical reduction of seawater-derived dissolved sulfate (SO4) are the primary sources of sulfur in mid-ocean ridge and some back-arc systems. At PACMANUS and SuSu Knolls hydrothermal systems in the Eastern Manus Basin, a significant contribution of sulfur is derived from disproportionation of magmatic sulfur dioxide (SO2), while the remaining sulfur is derived from crustal host rocks and SO4 reduction. At the sedimented Guaymas Basin hydrothermal system, sulfur sources include crustal host rock, reduced seawater SO4, and biogenic sulfide. Vent fluid flow through fresher, less-mature sediment supplies an increased quantity of reactant organic compounds that may reduce 34S-enriched SO4, while fluid interaction with more highly-altered sediments results in H2S characterized by a small, but isotopically-significant input of 34S-depleted biogenic sulfides. Near-zero $Δ$33S values in all samples implicate the abiotic processes of SO4 reduction and leaching of host rock as the major contributors to sulfur content at a high temperature unsedimented mid-ocean ridge and at a back-arc system. $Δ$33S values indicate that SO2 disproportionation is an additional process that contributes sulfur to a different back-arc system and to acid spring-type hydrothermal fluid circulation. At the sedimented Guaymus Basin, near-zero $Δ$33S values are also observed, despite negative $δ$34S values that indicate inputs of biogenic pyrite for some samples. In contrast with previous studies reporting isotope disequilibrium between H2S and chalcopyrite, the $δ$34S values of chalcopyrite sampled from the inner 1{\textendash}2 mm of a chimney wall are within {\textpm}1{\textperthousand} of $δ$34S values for H2S in the paired vent fluid, suggesting equilibrium fluid-mineral sulfur isotope exchange at 300{\textendash}400 {\textdegree}C. Isotopic equilibrium between hydrothermal fluid H2S and precipitating chalcopyrite implies that sulfur isotopes in the chalcopyrite lining across a chimney wall may accurately record past hydrothermal activity.},
	keywords = {HOV Alvin (Human Occupied Vehicle), ROV Jason (Remotely Operated Vehicle)},
	doi = {10.1016/j.gca.2015.02.016},
	author = {McDermott, J M and Ono, S and Tivey, M K and Seewald, J S and Shanks, W C}
}
@article {Jamieson2013,
	title = {{Sulfide geochronology along the Endeavour Segment of the Juan de Fuca Ridge}},
	journal = {Geochemistry, Geophysics, Geosystems},
	volume = {14},
	number = {7},
	year = {2013},
	pages = {2084{\textendash}2099},
	abstract = {Forty-nine hydrothermal sulfide-sulfate rock samples from the Endeavour Segment of the Juan de Fuca Ridge, northeastern Pacific Ocean, were dated by measuring the decay of 226Ra (half-life of 1600 years) in hydrothermal barite to provide a history of hydrothermal venting at the site over the past 6000 years. This dating method is effective for samples ranging in age from \~{}200 to 20,000 years old and effectively bridges an age gap between shorter- and longer-lived U-series dating techniques for hydrothermal deposits. Results show that hydrothermal venting at the active High Rise, Sasquatch, and Main Endeavour fields began at least 850, 1450, and 2300 years ago, respectively. Barite ages of other inactive deposits on the axial valley floor are between \~{}1200 and \~{}2200 years old, indicating past widespread hydrothermal venting outside of the currently active vent fields. Samples from the half-graben on the eastern slope of the axial valley range in age from \~{}1700 to \~{}2925 years, and a single sample from outside the axial valley, near the westernmost valley fault scarp is \~{}5850 {\textpm} 205 years old. The spatial relationship between hydrothermal venting and normal faulting suggests a temporal relationship, with progressive younging of sulfide deposits from the edges of the axial valley toward the center of the rift. These relationships are consistent with the inward migration of normal faulting toward the center of the valley over time and a minimum age of onset of hydrothermal activity in this region of 5850 years.},
	keywords = {HOV Alvin (Human Occupied Vehicle)},
	doi = {10.1002/ggge.20133},
	author = {Jamieson, J W and Hannington, M D and Clague, D A and Kelley, D S and Delaney, J R and Holden, J F and Tivey, M K and Kimpe, L E}
}
@article {Tivey2012,
	title = {{Links from Mantle to Microbe at the Lau Integrated Study Site:Insights from a Back-Arc Spreading Center}},
	journal = {Oceanography},
	volume = {25},
	number = {1},
	year = {2012},
	month = {mar},
	pages = {62{\textendash}77},
	abstract = {The Lau Integrated Study Site (ISS) has provided unique opportunities for study of ridge processes because of its back-arc setting in the southwestern Pacific. Its location allows study of a biogeographical province distinct from those of eastern Pacific and mid-Atlantic ridges, and crustal compositions along the ridge lie outside the range of mid-ocean ridge crustal compositions. The Lau ISS is located above a subduction zone, at an oblique angle. The underlying mantle receives water and other elements derived from the downgoing lithospheric slab, with an increase in slab influence from north to south. Water lowers the mantle melting temperature and leads to greater melt production where the water flux is greater, and to distinctive regional-scale gradients along the ridge. There are deeper faulted axial valleys with basaltic volcanism in the north and inflated axial highs with andesites in the south. Differences in igneous rock composition and release of magmatic volatiles affect compositions of vent fluids and deposits. Differences in vent fluid compositions and small-scale diffuse-flow regimes correlate with regional-scale patterns in microbial and megafaunal distributions. The interdisciplinary research effort at the Lau ISS has successfully identified linkages between subsurface processes and deep-sea biological communities, from mantle to microbe to megafauna.},
	keywords = {AUV ABE (Autonomous Benthic Explorer), ROV Jason (Remotely Operated Vehicle)},
	issn = {1042-8275},
	doi = {10.5670/oceanog.2012.04},
	author = {Tivey, M K and Becker, E and Beinart, R and Fisher, C R and Girguis, P R and Langmuir, C H and Michael, P J and Reysenbach, A -L}
}
@article {Mottl2011,
	title = {{Chemistry of hot springs along the Eastern Lau Spreading Center}},
	journal = {Geochimica et Cosmochimica Acta},
	volume = {75},
	number = {4},
	year = {2011},
	pages = {1013{\textendash}1038},
	abstract = {The Eastern Lau Spreading Center (ELSC) is the southernmost part of the back-arc spreading axis in the Lau Basin, west of the Tonga trench and the active Tofua volcanic arc. Over its 397-km length it exhibits large and systematic changes in spreading rate, magmatic/tectonic processes, and proximity to the volcanic arc. In 2005, we collected 81 samples of vent water from six hydrothermal fields along the ELSC. The chemistry of these waters varies both within and between vent fields, in response to changes in substrate composition, temperature and pressure, pH, water/rock ratio, and input from magmatic gases and subducted sediment. Hot-spring temperatures range from 229{\textdegree} to 363~{\textdegree}C at the five northernmost fields, with a general decrease to the south that is reversed at the Mariner field. The southernmost field, Vai Lili, emitted water at up to 334~{\textdegree}C in 1989 but had a maximum venting temperature of only 121~{\textdegree}C in 2005, due to waning activity and admixture of bottom seawater into the subseafloor plumbing system. Chloride varies both within fields and from one field to another, from a low of 528~mmol/kg to a high of 656~mmol/kg, and may be enriched by phase separation and/or leaching of Cl from the rock. Concentrations of the soluble elements K, Rb, Cs, and B likewise increase southward as the volcanic substrate becomes more silica-rich, especially on the Valu Fa Ridge. Iodine and $δ$7Li increase southward, and $δ$11B decreases as B increases, apparently in response to increased input from subducted sediment as the arc is approached. Species that decrease southward as temperature falls are Si, H2S, Li, Na/Cl, Fe, Mn, and 87Sr/86Sr, whereas pH, alkalinity, Ca, and Sr increase. Oxygen isotopes indicate a higher water/rock ratio in the three systems on Valu Fa Ridge, consistent with higher porosity in more felsic volcanic rocks. Vent waters at the Mariner vent field on the Valu Fa Ridge are significantly hotter, more acid and metal-rich, less saline, and richer in dissolved gases and other volatiles, including H2S, CO2, and F, than the other vent fields, consistent with input of magmatic gases. The large variations in geologic and geophysical parameters produced by back-arc spreading along the ELSC, which exceed those along mid-ocean ridge spreading axes, produce similar large variations in the composition of vent waters, and thus provide new insights into the processes that control the chemistry of submarine hot springs.},
	keywords = {ROV Jason (Remotely Operated Vehicle)},
	issn = {0016-7037},
	doi = {10.1016/j.gca.2010.12.008},
	url = {http://dx.doi.org/10.1016/j.gca.2010.12.008},
	author = {Mottl, M J and Seewald, J S and Wheat, C G and Tivey, M K and Michael, P J and Proskurowski, G and McCollom, T M and Reeves, E and Sharkey, J and You, C F and Chan, L H and Pichler, T}
}
@article {Craddock2010a,
	title = {{Rare earth element abundances in hydrothermal fluids from the Manus Basin, Papua New Guinea: indicators of sub-seafloor hydrothermal processes in back-arc basins}},
	journal = {Geochimica et Cosmochimica Acta},
	volume = {74},
	number = {19},
	year = {2010},
	pages = {5494{\textendash}5513},
	abstract = {Rare earth element (REE) concentrations are reported for a large suite of seafloor vent fluids from four hydrothermal systems in the Manus back-arc basin (Vienna Woods, PACMANUS, DESMOS and SuSu Knolls vent areas). Sampled vent fluids show a wide range of absolute REE concentrations and chondrite-normalized (REEN) distribution patterns (LaN /SmN \~{} 0.6{\textendash}11; LaN /YbN \~{} 0.6 {\textendash} 71; View the MathML sourceEuN/EuN*\~{}1{\textendash}55). REEN distribution patterns in different vent fluids range from light-REE enriched, to mid- and heavy-REE enriched, to flat, and have a range of positive Eu-anomalies. This heterogeneity contrasts markedly with relatively uniform REEN distribution patterns of mid-ocean ridge hydrothermal fluids. In Manus Basin fluids, aqueous REE compositions do not inherit directly or show a clear relationship with the REE compositions of primary crustal rocks with which hydrothermal fluids interact. These results suggest that the REEs are less sensitive indicators of primary crustal rock composition despite crustal rocks being the dominant source of REEs in submarine hydrothermal fluids. In contrast, differences in aqueous REE compositions are consistently correlated with differences in fluid pH and ligand (chloride, fluoride and sulfate) concentrations. Our results suggest that the REEs can be used as an indicator of the type of magmatic acid volatile (i.e., presence of HF, SO2) degassing in submarine hydrothermal systems. Additional fluid data suggest that near-seafloor mixing between high-temperature hydrothermal fluid and locally entrained seawater at many vent areas in the Manus Basin causes anhydrite precipitation. Anhydrite effectively incorporates REE and likely affects measured fluid REE concentrations, but does not affect their relative distributions.},
	keywords = {ROV Jason (Remotely Operated Vehicle)},
	issn = {0016-7037},
	doi = {10.1016/j.gca.2010.07.003},
	url = {http://dx.doi.org/10.1016/j.gca.2010.07.003},
	author = {Craddock, P R and Bach, W and Seewald, J S and Rouxel, O J and Reeves, E and Tivey, M K}
}
@article {Sarrazin2009,
	title = {{A dual sensor device to estimate fluid flow velocity at diffuse hydrothermal vents}},
	journal = {Deep-Sea Research. Part I: Oceanographic Research Papers},
	volume = {56},
	number = {11},
	year = {2009},
	pages = {2065{\textendash}2074},
	keywords = {ROV Jason (Remotely Operated Vehicle)},
	issn = {0967-0637},
	doi = {10.1016/j.dsr.2009.06.008},
	url = {http://dx.doi.org/10.1016/j.dsr.2009.06.008},
	author = {Sarrazin, J and Rodier, P and Tivey, M K and Singh, H and Schultz, A and Sarradin, P -M}
}
@article {Ferrini2008,
	title = {{Variable morphologic expression of volcanic, tectonic, and hydrothermal processes at six hydrothermal vent fields in the Lau back-arc basin}},
	journal = {Geochemistry, Geophysics, Geosystems},
	volume = {9},
	year = {2008},
	pages = {Q07022},
	keywords = {HOV Alvin (Human Occupied Vehicle)},
	issn = {1525-2027},
	doi = {10.1029/2008GC002047},
	url = {http://dx.doi.org/10.1029/2008GC002047},
	author = {Ferrini, V L and Tivey, M K and Carbotte, S M and Martinez, F and Roman, C}
}
@article {Reysenbach2006,
	title = {{A ubiquitous thermoacidophilic archaeon from deep-sea hydrothermal vents}},
	journal = {Nature},
	volume = {442},
	number = {7101},
	year = {2006},
	pages = {444{\textendash}447},
	keywords = {HOV Alvin (Human Occupied Vehicle), ROV Jason (Remotely Operated Vehicle)},
	issn = {0028-0836},
	doi = {10.1038/nature04921},
	url = {http://dx.doi.org/10.1038/nature04921},
	author = {Reysenbach, A -L and Liu, Y T and Banta, A B and Beveridge, T J and Kirshtein, J D and Schouten, S and Tivey, M K and Von Damm, K L and Voytek, M A}
}
@article {Ding2005,
	title = {{The in situ pH of hydrothermal fluids at mid-ocean ridges}},
	journal = {Earth and Planetary Science Letters},
	volume = {237},
	number = {1-2},
	year = {2005},
	pages = {167{\textendash}174},
	keywords = {HOV Alvin (Human Occupied Vehicle)},
	issn = {0012-821X},
	doi = {10.1016/j.epsl.2005.04.041},
	url = {http://dx.doi.org/10.1016/j.epsl.2005.04.041},
	author = {Ding, K and Seyfried, W E and Zhang, Z and Tivey, M K and Von Damm, K L and Bradley, A M}
}
@article {Tivey2004,
	title = {{The remarkable diversity of seafloor vents: Continuing explorations reveal an increasing variety of hydrothermal systems}},
	journal = {Oceanus},
	volume = {42},
	number = {2},
	year = {2004},
	pages = {60{\textendash}65},
	keywords = {HOV Alvin (Human Occupied Vehicle)},
	issn = {0029-8182},
	author = {Tivey, M K}
}
@article {Sarrazin2002,
	title = {{Mosaic community dynamics on Juan de Fuca Ridge sulphide edifices: Substratum, temperature and implications for trophic structure}},
	journal = {Cahiers de Biologie Marine},
	volume = {43},
	number = {3-4},
	year = {2002},
	pages = {275{\textendash}279},
	keywords = {HOV Alvin (Human Occupied Vehicle)},
	issn = {0007-9723},
	url = {http://cbm-online.sb-roscoff.fr/pdf/cb43-3-275-279.pdf},
	author = {Sarrazin, J and Levesque, C and Juniper, S K and Tivey, M K}
}
@article {Ding2001,
	title = {{In situ measurement of dissolved H (sub 2) and H (sub 2) S in high-temperature hydrothermal vent fluids at the Main Endeavour Field, Juan de Fuca Ridge}},
	journal = {Earth and Planetary Science Letters},
	volume = {186},
	number = {3-4},
	year = {2001},
	pages = {417{\textendash}425},
	keywords = {HOV Alvin (Human Occupied Vehicle)},
	issn = {0012-821X},
	doi = {10.1016/S0012-821X(01)00257-6},
	url = {http://dx.doi.org/10.1016/S0012-821X(01)00257-6},
	author = {Ding, K and Seyfried, W E and Tivey, M K and Bradley, A M}
}
@article {Williams2001,
	title = {{Tidal currents at hydrothermal vents, Juan de Fuca Ridge}},
	journal = {Sea Technology},
	volume = {42},
	number = {6},
	year = {2001},
	pages = {62{\textendash}96},
	keywords = {HOV Alvin (Human Occupied Vehicle)},
	issn = {0093-3651},
	author = {Williams, A J and Tivey, M K}
}
@article {Tivey1998,
	title = {{How to build a black smoker chimney}},
	journal = {Oceanus},
	volume = {41},
	number = {2},
	year = {1998},
	pages = {22{\textendash}26},
	keywords = {HOV Alvin (Human Occupied Vehicle)},
	issn = {0029-8182},
	author = {Tivey, M K}
}
@article {Langmuir1997,
	title = {{Hydrothermal vents near a mantle hot spot: The Lucky Strike vent field at 37 degrees N on the Mid-Atlantic Ridge}},
	journal = {Earth and Planetary Science Letters},
	volume = {148},
	number = {1-2},
	year = {1997},
	pages = {69{\textendash}91},
	keywords = {HOV Alvin (Human Occupied Vehicle)},
	issn = {0012-821X},
	doi = {10.1016/S0012-821X(97)00027-7},
	url = {http://dx.doi.org/10.1016/S0012-821X(97)00027-7},
	author = {Langmuir, C and Humphris, S E and Fornari, D J and Van Dover, C L and Von Damm, K L and Tivey, M K and Colodner, D and Charlou, J L and Desonie, D and Wilson, D and Fouquet, Y and Klinkhammer, G and Bougault, H}
}
@article {Tivey1995,
	title = {{Deducing patterns of fluid flow and mixing within the TAG hydrothermal mound using mineralogical and geochemical data}},
	journal = {Journal of Geophysical Research},
	volume = {100},
	number = {B7},
	year = {1995},
	pages = {12,512{\textendash}527,555},
	keywords = {HOV Alvin (Human Occupied Vehicle)},
	issn = {0148-0227},
	doi = {10.1029/94GL02081},
	url = {http://dx.doi.org/10.1029/94GL02081},
	author = {Tivey, M K and Humphris, S E and Thompson, G and Hannington, M D and Rona, P A}
}
@article {Rona1993,
	title = {{Active and relict sea-floor hydorthermal mineralization at the TAG hydrothermal field, Mid-Atlantic Ridge}},
	journal = {Economic Geology},
	volume = {88},
	number = {8},
	year = {1993},
	pages = {1989{\textendash}2017},
	issn = {0361-0128},
	doi = {10.2113/gsecongeo.88.8.1989},
	url = {http://dx.doi.org/10.2113/gsecongeo.88.8.1989},
	author = {Rona, P A and Hannington, M D and Raman, C V and Thompson, G and Tivey, M K and Humphris, S E and Lalou, C and Petersen, S}
}
@article {Delaney1992,
	title = {{Geology of a vigorous hydrothermal system on the Endeavour Segment, Juan de Fuca Ridge}},
	journal = {Journal of Geophysical Research},
	volume = {97},
	year = {1992},
	pages = {19,619{\textendash}663,682},
	keywords = {HOV Alvin (Human Occupied Vehicle)},
	issn = {0148-0227},
	doi = {10.1029/92JB00174},
	url = {http://dx.doi.org/10.1029/92JB00174},
	author = {Delaney, J R and Robigou, V and McDuff, R E and Tivey, M K}
}
@article {Tivey1991,
	title = {{Hydrothermal vent systems}},
	journal = {Oceanus},
	volume = {34},
	number = {4},
	year = {1991},
	pages = {68{\textendash}74},
	keywords = {HOV Alvin (Human Occupied Vehicle)},
	issn = {0029-8182},
	author = {Tivey, M K}
}
@article {Tivey1986,
	title = {{Growth of large sulfide structures on the endeavour segment of the Juan de Fuca ridge}},
	journal = {Earth and Planetary Science Letters},
	volume = {77},
	number = {3-4},
	year = {1986},
	pages = {303{\textendash}317},
	keywords = {HOV Alvin (Human Occupied Vehicle)},
	issn = {0012-821X},
	doi = {10.1016/0012-821X(86)90142-1},
	url = {http://dx.doi.org/10.1016/0012-821X(86)90142-1},
	author = {Tivey, M K and Delaney, J R}
}
