@article {Rouxel2016,
	title = {{Geochemistry and iron isotope systematics of hydrothermal plume fall-out at East Pacific Rise 9{\textdegree}50'N}},
	journal = {Chemical Geology},
	volume = {441},
	year = {2016},
	pages = {212{\textendash}234},
	abstract = {While gross hydrothermal fluxes entering the ocean are known to be significant, much remains unknown about the fate of this material as it disperses through the oceans, and its impact upon ocean biogeochemistry. Mineral precipitation within hydrothermal plumes removes hydrothermally-sourced metals from solution and also acts to scavenge trace elements from the surrounding water column. Here, we investigate the fate of particulate Fe released from high-temperature hydrothermal venting at EPR 9{\textdegree}50'N and its potential impact on local deep-ocean Fe-isotopic and geochemical budgets. We measured the geochemical composition, mineralogy and Fe isotope systematics of hydrothermal plume products in order to determine whether mineral precipitation imposes characteristic Fe-isotope {\textquotedblleft}fingerprints{\textquotedblright} for hydrothermally sourced Fe in the deep ocean. Our sampling includes sediment trap deployments after the eruptive event of Jan. 2006, allowing the examination of temporal changes of hydrothermal fluxes over a 160 day period. Results show that Fe isotope composition in the high-temperature vent fluids is rather constant over the sampling period 2004{\textendash}2008, and that secular variations of $δ$56Fe values of plume particles from - 0.03 to - 0.91{\textperthousand} (relative to IRMM-14 standard) could be explained by local processes leading to variable mixing extents of hydrothermal, biogenic and lithogenic particles. Through geochemical modeling, we have calculated the relative abundances of hydrothermal plume components such as sulfides, Fe oxyhydroxides, organic matter, biogenic and lithogenic phases. We demonstrate that Fe isotope fractionation in the hydrothermal plume occurs during the formation and rapid settling of Fe-sulfides that are characterized by $δ$56Fe values ranging from - 0.73 {\textpm} 0.13{\textperthousand} to - 0.86 {\textpm} 0.13{\textperthousand}, which is systematically lower than the end-member hydrothermal fluids ($δ$56Fe = - 0.4{\textperthousand}). This study suggests that both the initial Fe isotope composition of the high-temperature vent fluids and its initial Fe/H2S ratio (i.e. Fe-sulfide precipitation versus Fe-oxyhydroxide precipitation) should impose characteristic Fe isotope {\textquotedblleft}fingerprints{\textquotedblright} for hydrothermally derived Fe in the deep ocean.},
	keywords = {HOV Alvin (Human Occupied Vehicle)},
	doi = {10.1016/j.chemgeo.2016.08.027},
	author = {Rouxel, O J and Toner, B M and Manganini, S J and German, C R}
}
@article {Feseker2014,
	title = {{Eruption of a deep-sea mud volcano triggers rapid sediment movement}},
	journal = {Nature Communications},
	volume = {5},
	year = {2014},
	pages = {5385},
	abstract = {Submarine mud volcanoes are important sources of methane to the water column. However, the temporal variability of their mud and methane emissions is unknown. Methane emissions were previously proposed to result from a dynamic equilibrium between upward migration and consumption at the seabed by methane-consuming microbes. Here we show non-steady-state situations of vigorous mud movement that are revealed through variations in fluid flow, seabed temperature and seafloor bathymetry. Time series data for pressure, temperature, pH and seafloor photography were collected over 431 days using a benthic observatory at the active H{\aa}kon Mosby Mud Volcano. We documented 25 pulses of hot subsurface fluids, accompanied by eruptions that changed the landscape of the mud volcano. Four major events triggered rapid sediment uplift of more than a metre in height, substantial lateral flow of muds at average velocities of 0.4 m per day, and significant emissions of methane and CO2 from the seafloor.},
	keywords = {AUV Sentry (Autonomous Underwater Vehicle)},
	doi = {10.1038/ncomms6385},
	author = {Feseker, T and Boetius, A and Wenzh{\"o}fer, F and Blandin, J and Olu, K and Yoerger, D R and Camilli, R and German, C R and de Beer, D}
}
@article {ISI:000345820100015,
	title = {{A large volume particulate and water multi-sampler with in situ preservation for microbial and biogeochemical studies}},
	journal = {DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS},
	volume = {94},
	year = {2014},
	month = {dec},
	pages = {195{\textendash}206},
	type = {Article},
	abstract = {A new tool was developed for large volume sampling to facilitate marine microbiology and biogeochemical studies. It was developed for remotely operated vehicle and hydrocast deployments, and allows for rapid collection of multiple sample types from the water column and dynamic, variable environments such as rising hydrothermal plumes. It was used successfully during a cruise to the hydrothermal vent systems of the Mid-Cayman Rise. The Suspended Particulate Rosette V2 large volume multi-sampling system allows for the collection of 14 sample sets per deployment. Each sample set can include filtered material, whole (unfiltered) water, and filtrate. Suspended particulate can be collected on filters up to 142 mm in diameter and pore sizes down to 0.2 mu m. Filtration is typically at flowrates of 2 L min(-1) For particulate material, filtered volume is constrained only by sampling time and filter capacity, with all sample volumes recorded by digital flowmeter. The suspended particulate filter holders can be filled with preservative and sealed immediately after sample collection. Up to 2 L of whole water, filtrate, or a combination of the two, can be collected as part of each sample set. The system is constructed of plastics with titanium fasteners and nickel alloy spring loaded seals. There are no ferrous alloys in the sampling system. Individual sample lines are prefilled with filtered, deionized water prior to deployment and remain sealed unless a sample is actively being collected. This system is intended to facilitate studies concerning the relationship between marine microbiology and ocean biogeochemistry. (C) 2014 Elsevier Ltd. All rights reserved.},
	keywords = {ROV Jason (Remotely Operated Vehicle)},
	issn = {0967-0637},
	doi = {10.1016/j.dsr.2014.08.008},
	author = {Breier, J A and Sheik, C S and Gomez-Ibanez, D and Sayre-McCord, R T and Sanger, R and Rauch, C and Coleman, M and Bennett, S A and Cron, B R and Li, M and German, C R and Toner, B M and Dick, G J}
}
@article {Wagner2013,
	title = {{Cold-seep habitat mapping: High-resolution spatial characterization of the Blake Ridge Diapir seep field}},
	journal = {Deep-Sea Research. Part II: Topical Studies in Oceanography},
	volume = {92},
	number = {SI},
	year = {2013},
	pages = {183{\textendash}188},
	abstract = {Relationships among seep community biomass, diversity, and physiographic controls such as underlying geology are not well understood. Previous efforts to constrain these relationships at the Blake Ridge Diapir were limited to observations from piloted deep-submergence vehicles. In August 2012, the autonomous underwater vehicle (AUV) Sentry collected geophysical and photographic data over a 0.131~km2 area at the Blake Ridge Diapir seeps. A nested survey approach was used that began with a regional or reconnaissance-style survey using sub-bottom mapping systems to locate and identify seeps and underlying conduits. This survey was followed by AUV-mounted sidescan sonar and multibeam echosounder systems mapping on a mesoscale to characterize the seabed physiography. At the most detailed survey level, digital photographic imaging was used to resolve sub-meter characteristics of the biology. Four pockmarks (25{\textendash}70~m diameter) were documented, each supporting chemosynthetic communities. Concentric zonation of mussels and clams suggests the influence of chemical gradients on megafaunal distribution. Data collection and analytical techniques used here yield high-resolution habitat maps that can serve as baselines to constrain temporal evolution of seafloor seeps, and to inform ecological niche modeling and resource management.},
	keywords = {AUV Sentry (Autonomous Underwater Vehicle)},
	doi = {10.1016/j.dsr2.2013.02.008},
	author = {Wagner, J K S and McEntee, M H and Brothers, L L and German, C R and Kaiser, C L and Yoerger, D R and Van Dover, C L}
}
@article {Brothers2013,
	title = {{Evidence for extensive methane venting on the southeastern U.S. Atlantic margin}},
	journal = {Geology},
	volume = {41},
	number = {7},
	year = {2013},
	month = {jul},
	pages = {807{\textendash}810},
	abstract = {We present the first evidence for widespread seabed methane venting along the southeastern United States Atlantic margin beyond the well-known Blake Ridge diapir seep. Recent ship- and autonomous underwater vehicle (AUV)-collected data resolve multiple water-column anomalies ({\textgreater}1000 m height) and extensive new chemosynthetic seep communities at the Blake Ridge and Cape Fear diapirs. These results indicate that multiple, highly localized fluid conduits punctuate the areally extensive Blake Ridge gas hydrate province, and enable the delivery of significant amounts of methane to the water column. Thus, there appears to be an abundance of seabed fluid flux not previously ascribed to the Atlantic margin of the United States.},
	keywords = {AUV Sentry (Autonomous Underwater Vehicle)},
	issn = {0091-7613},
	doi = {10.1130/G34217.1},
	author = {Brothers, L L and Van Dover, C L and German, C R and Kaiser, C L and Yoerger, D R and Ruppel, C D and Lobecker, E and Skarke, A D and Wagner, J K S}
}
@article {Kinsey2013,
	title = {{Sustained volcanically-hosted venting at ultraslow ridges: Piccard Hydrothermal Field, Mid-Cayman Rise}},
	journal = {Earth and Planetary Science Letters},
	volume = {380},
	year = {2013},
	pages = {162{\textendash}168},
	abstract = {At slow spreading mid-ocean ridges sustained submarine venting and the deposition of large seafloor massive sulfide deposits have previously been ascribed to tectonically-controlled hydrothermal circulation unrelated to young volcanic activity. Here, by contrast, we show that the Piccard Hydrothermal Field (PHF), on the ultraslow spreading Mid-Cayman Rise, represents a site of sustained fluid flow and sulfide formation hosted in a neovolcanic setting. The lateral extent and apparent longevity associated with the PHF are comparable to some of the largest tectonically-hosted vent sites known along the slow-spreading Mid-Atlantic Ridge. If such systems recur along all ultraslow ridges, which comprise \~{}20{\%} of the \~{}55,000 km global ridge crest, potential implications would include (i) a higher probability of locating large, economically valuable, mineral deposits along ultraslow ridges together with (ii) larger fluxes than previously anticipated of chemicals released from high-temperature venting entering the oceans along the Atlantic{\textendash}Indian Ocean sectors of the deep-ocean thermohaline conveyor.},
	keywords = {ROV Jason (Remotely Operated Vehicle)},
	issn = {0012-821X},
	doi = {10.1016/j.epsl.2013.08.001},
	url = {http://www.sciencedirect.com/science/article/pii/S0012821X13004214},
	author = {Kinsey, J C and German, C R}
}
@article {Bennett2013,
	title = {{Trophic regions of a hydrothermal plume dispersing away from an ultramafic-hosted vent-system: Von Damm vent-site, Mid-Cayman Rise}},
	journal = {Geochemistry, Geophysics, Geosystems},
	volume = {14},
	number = {2},
	year = {2013},
	pages = {317{\textendash}327},
	abstract = {Deep-sea ultramafic-hosted vent systems have the potential to provide large amounts of metabolic energy to both autotrophic and heterotrophic microorganisms in their dispersing hydrothermal plumes. Such vent-systems release large quantities of hydrogen and methane to the water column, both of which can be exploited by autotrophic microorganisms. Carbon cycling in these hydrothermal plumes may, therefore, have an important influence on open-ocean biogeochemistry. In this study, we investigated an ultramafic-hosted system on the Mid-Cayman Rise, emitting metal-poor and hydrogen sulfide-, methane-, and hydrogen-rich hydrothermal fluids. Total organic carbon concentrations in the plume ranged between 42.1 and 51.1 $μ$M (background = 43.2 {\textpm} 0.7 $μ$M (n = 5)) and near-field plume samples with elevated methane concentrations imply the presence of chemoautotrophic primary production and in particular methanotrophy. In parts of the plume characterized by persistent potential temperature anomalies but lacking elevated methane concentrations, we found elevated organic carbon concentrations of up to 51.1 $μ$M, most likely resulting from the presence of heterotrophic communities, their extracellular products and vent larvae. Elevated carbon concentrations up to 47.4 $μ$M were detected even in far-field plume samples. Within the Von Damm hydrothermal plume, we have used our data to hypothesize a microbial food web in which chemoautotrophy supports a heterotrophic community of microorganisms. Such an active microbial food web would provide a source of labile organic carbon to the deep ocean that should be considered in any future studies evaluating sources and sinks of carbon from hydrothermal venting to the deep ocean.},
	keywords = {ROV Jason (Remotely Operated Vehicle)},
	issn = {1525-2027},
	doi = {10.1002/ggge.20063},
	url = {http://dx.doi.org/10.1002/ggge.20063},
	author = {Bennett, S A and Coleman, Max and Huber, J A and Reddington, E and Kinsey, J C and McIntyre, C and Seewald, J S and German, C R}
}
@article {Connelly2012,
	title = {{Hydrothermal vent fields and chemosynthetic biota on the world{\textquoteright}s deepest seafloor spreading centre}},
	journal = {Nature Communications},
	volume = {3},
	year = {2012},
	month = {jan},
	pages = {620},
	abstract = {The Mid-Cayman spreading centre is an ultraslow-spreading ridge in the Caribbean Sea. Its extreme depth and geographic isolation from other mid-ocean ridges offer insights into the effects of pressure on hydrothermal venting, and the biogeography of vent fauna. Here we report the discovery of two hydrothermal vent fields on the Mid-Cayman spreading centre. The Von Damm Vent Field is located on the upper slopes of an oceanic core complex at a depth of 2,300 m. High-temperature venting in this off-axis setting suggests that the global incidence of vent fields may be underestimated. At a depth of 4,960 m on the Mid-Cayman spreading centre axis, the Beebe Vent Field emits copper-enriched fluids and a buoyant plume that rises 1,100 m, consistent with {\textgreater}400 degrees C venting from the world{\textquoteright}s deepest known hydrothermal system. At both sites, a new morphospecies of alvinocaridid shrimp dominates faunal assemblages, which exhibit similarities to those of Mid-Atlantic vents.},
	issn = {2041-1723},
	doi = {10.1038/ncomms1636},
	author = {Connelly, D P and Copley, J T and Murton, B J and Stansfield, K and Tyler, P A and German, C R and Van Dover, C L and Amon, D and Furlong, M and Grindlay, N and Hayman, N and Huehnerbach, V and Judge, M and Le Bas, Tim and McPhail, S and Meier, A and Nakamura, K I and Nye, Verity and Pebody, M and Pedersen, R B and Plouviez, S and Sands, Carla and Searle, R C and Stevenson, P and Taws, Sarah and Wilcox, S}
}
@article {White2012,
	title = {{Impact of the Deepwater Horizon oil spill on a deep-water coral community in the Gulf of Mexico}},
	journal = {Proceedings of the National Academy of Sciences of the United States of America},
	volume = {109},
	number = {50},
	year = {2012},
	month = {dec},
	pages = {20303{\textendash}20308},
	abstract = {To assess the potential impact of the Deepwater Horizon oil spill on offshore ecosystems, 11 sites hosting deep-water coral communities were examined 3 to 4 mo after the well was capped. Healthy coral communities were observed at all sites {\textgreater}20 km from the Macondo well, including seven sites previously visited in September 2009, where the corals and communities appeared unchanged. However, at one site 11 km southwest of the Macondo well, coral colonies presented widespread signs of stress, including varying degrees of tissue loss, sclerite enlargement, excess mucous production, bleached commensal ophiuroids, and covering by brown flocculent material (floc). On the basis of these criteria the level of impact to individual colonies was ranked from 0 (least impact) to 4 (greatest impact). Of the 43 corals imaged at that site, 46{\%} exhibited evidence of impact on more than half of the colony, whereas nearly a quarter of all of the corals showed impact to {\textgreater}90{\%} of the colony. Additionally, 53{\%} of these corals{\textquoteright} ophiuroid associates displayed abnormal color and/or attachment posture. Analysis of hopanoid petroleum biomarkers isolated from the floc provides strong evidence that this material contained oil from the Macondo well. The presence of recently damaged and deceased corals beneath the path of a previously documented plume emanating from the Macondo well provides compelling evidence that the oil impacted deep-water ecosystems. Our findings underscore the unprecedented nature of the spill in terms of its magnitude, release at depth, and impact to deep-water ecosystems.},
	keywords = {HOV Alvin (Human Occupied Vehicle), ROV Jason (Remotely Operated Vehicle)},
	issn = {0027-8424},
	doi = {10.1073/pnas.1118029109},
	author = {White, H K and Hsing, P-Y and Cho, W and Shank, T M and Cordes, E E and Quattrini, A M and Nelson, R K and Camilli, R and Demopoulos, A W J and German, C R and Brooks, J M and Roberts, H H and Shedd, W and Reddy, C M and Fisher, C R}
}
@article {White2012a,
	title = {{Reply to Boehm and Carragher: Multiple lines of evidence link deep-water coral damage to Deepwater Horizon oil spill}},
	journal = {Proceedings of the National Academy of Sciences of the United States of America},
	volume = {109},
	number = {40},
	year = {2012},
	month = {oct},
	pages = {E2648{\textendash}E2648},
	abstract = {Our original study (1) used visual inspection as well as biological and geochemical analyses of corals and the surrounding sediment to provide complementary and compelling evidence linking the Deepwater Horizon (DWH) oil spill to the presence of damaged deep-water corals and brittle stars 11 km from the site of the leaking oil.},
	issn = {0027-8424},
	doi = {10.1073/pnas.1210413109},
	author = {White, H K and Hsing, P-Y and Cho, W and Shank, T M and Cordes, E E and Quattrini, A M and Nelson, R K and Camilli, R and Demopoulos, A W J and German, C R and Brooks, J M and Roberts, H H and Shedd, W and Reddy, C M and Fisher, C R}
}
@conference {Kaiser2012,
	title = {{Satellite based remote management and operation of a 6000m AUV}},
	booktitle = {Oceans, 2012},
	volume = {Hampton Ro},
	year = {2012},
	abstract = {During a July, 2012 expedition to the Hatteras Transverse Canyon, Blake Ridge, and Cape Fear Diapir, the AUV Sentry, aboard the NOAA Ship Okeanos, conducted experiments into remote operation of an AUV via satellite link. Remote launch, remote engineering, remote data processing and remote watch standing were all explored with varying degrees of success. Remote engineering and troubleshooting was found to be exceptionally promising and worthy of further effort. Remote data processing was a valuable addition for a telepresence enabled cruise where a substantial component of the science team was on shore. Remore watch standing and remote launch were both found to be viable though requiring improvement. Technology infrastructure is discussed along with successes, difficulties, and recommendations for future improvement.},
	keywords = {AUV Sentry (Autonomous Underwater Vehicle)},
	doi = {10.1109/OCEANS.2012.6404900},
	author = {Kaiser, C L and Kinsey, J C and Pinner, W and Yoerger, D R and German, C R and Van Dover, C L}
}
@article {Kinsey2011,
	title = {{Assessing the Deepwater Horizon oil spill with the Sentry autonomous underwater vehicle}},
	journal = {2011 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS)},
	year = {2011},
	pages = {261{\textendash}267},
	abstract = {This paper reports the Sentry autonomous underwater vehicle and its deployment on two cruises in response to the Deepwater Horizon oil spill. The first cruise, in June 2010, coupled Sentry with the TETHYS mass spectrometer to track and localize a subsea hydrocarbon plume at a depth of approximately 1100m going at least 30km from the oil spill site. In December 2010, Sentry mapped and photographed deep-sea biological communities for follow-up observations and sampling with the Alvin manned submersible. These cruises demonstrate how robots and novel sensing technologies contributed to the oil spill assessment and the broader impact of technologies developed for basic research.},
	keywords = {AUV Sentry (Autonomous Underwater Vehicle)},
	doi = {10.1109/IROS.2011.6095008},
	author = {Kinsey, J C and Yoerger, D R and Jakuba, M V and Camilli, Rich and Fisher, C R and German, C R}
}
@article {Bennett2011,
	title = {{Dissolved and particulate organic carbon in hydrothermal plumes from the East Pacific Rise, 9 degrees 50'N}},
	journal = {Deep-Sea Research. Part I: Oceanographic Research Papers},
	volume = {58},
	number = {9},
	year = {2011},
	pages = {922{\textendash}931},
	abstract = {Chemoautotrophic production in seafloor hydrothermal systems has the potential to provide an important source of organic carbon that is exported to the surrounding deep-ocean. While hydrothermal plumes may export carbon, entrained from chimney walls and biologically rich diffuse flow areas, away from sites of venting they also have the potential to provide an environment for in-situ carbon fixation. In this study, we have followed the fate of dissolved and particulate organic carbon (DOC and POC) as it is dispersed through and settles beneath a hydrothermal plume system at 9{\textdegree}50'N on the East Pacific Rise. Concentrations of both DOC and POC are elevated in buoyant plume samples that were collected directly above sites of active venting using both DSV Alvin and a CTD-rosette. Similar levels of POC enrichment are also observed in the dispersing non-buoyant plume, \~{}500~m downstream from the vent-site. Further, sediment-trap samples collected beneath the same dispersing plume system, show evidence for a close coupling between organic carbon and Fe oxyhydroxide fluxes. We propose, therefore, a process that concentrates POC into hydrothermal plumes as they disperse through the deep-ocean. This is most probably the result of some combination of preferential adsorption of organic carbon onto Fe-oxyhydroxides and/or microbial activity that preferentially concentrates organic carbon in association with Fe-oxyhydroxides (e.g. through the microbial oxidation of Fe(II) and Fe sulfides). This potential for biological production and consumption within hydrothermal plumes highlights the importance of a multidisciplinary approach to understanding the role of the carbon cycle in deep-sea hydrothermal systems as well as the role that hydrothermal systems may play in regulating global deep-ocean carbon budgets.},
	keywords = {HOV Alvin (Human Occupied Vehicle)},
	issn = {0967-0637},
	doi = {10.1016/j.dsr.2011.06.010},
	url = {http://dx.doi.org/10.1016/j.dsr.2011.06.010},
	author = {Bennett, S A and Statham, P J and Green, D R H and Le Bris, N and McDermott, J M and Prado, F and Rouxel, O J and Von Damm, K L and German, C R}
}
@article {Adams2011,
	title = {{Surface-generated mesoscale eddies transport deep-sea products from hydrothermal vents}},
	journal = {Science},
	volume = {332},
	number = {6029},
	year = {2011},
	pages = {580{\textendash}583},
	abstract = {Atmospheric forcing, which is known to have a strong influence on surface ocean dynamics and production, is typically not considered in studies of the deep sea. Our observations and models demonstrate an unexpected influence of surface-generated mesoscale eddies in the transport of hydrothermal vent efflux and of vent larvae away from the northern East Pacific Rise. Transport by these deep-reaching eddies provides a mechanism for spreading the hydrothermal chemical and heat flux into the deep-ocean interior and for dispersing propagules hundreds of kilometers between isolated and ephemeral communities. Because the eddies interacting with the East Pacific Rise are formed seasonally and are sensitive to phenomena such as El Ni{\~n}o, they have the potential to introduce seasonal to interannual atmospheric variations into the deep sea.},
	keywords = {HOV Alvin (Human Occupied Vehicle)},
	issn = {0036-8075},
	doi = {10.1126/science.1201066},
	url = {http://dx.doi.org/10.1126/science.1201066},
	author = {Adams, D K and McGillicuddy, D J and Zamudio, L and Thurnherr, A M and Liang, X and Rouxel, O J and German, C R and Mullineaux, L S}
}
@inbook {Baker2010,
	title = {{Biogeography, Ecology and Vulnerability of Chemosynthetic Ecosystems in the Deep Sea}},
	booktitle = {Life in the World{\textquoteright}s Oceans: Diversity, Distribution, and Abundance},
	year = {2010},
	pages = {161{\textendash}182},
	publisher = {Wiley-Blackwell},
	organization = {Wiley-Blackwell},
	author = {Baker, M C and Ramirez-Llodra, E and Tyler, P A and German, C R and Boetius, A and Cordes, E E and Dubilier, N and Fisher, C R and Levin, L A and Metaxas, A and Rowden, R and Santos, R S and Shank, R and Van Dover, C L and Young, C and Waren, A}
}
@article {German2010,
	title = {{Diverse styles of submarine venting on the ultraslow spreading Mid-Cayman Rise}},
	journal = {Proceedings of the National Academy of Sciences of the United States of America},
	volume = {107},
	number = {32},
	year = {2010},
	month = {aug},
	pages = {14020{\textendash}14025},
	abstract = {Thirty years after the first discovery of high-temperature submarine venting, the vast majority of the global mid-ocean ridge remains unexplored for hydrothermal activity. Of particular interest are the world{\textquoteright}s ultraslow spreading ridges that were the last to be demonstrated to host high-temperature venting but may host systems particularly relevant to prebiotic chemistry and the origins of life. Here we report evidence for previously unknown, diverse, and very deep hydrothermal vents along the similar to 110 km long, ultraslow spreading Mid-Cayman Rise (MCR). Our data indicate that the MCR hosts at least three discrete hydrothermal sites, each representing a different type of water-rock interaction, including both mafic and ultramafic systems and, at similar to 5,000 m, the deepest known hydrothermal vent. Although submarine hydrothermal circulation, in which seawater percolates through and reacts with host lithologies, occurs on all mid-ocean ridges, the diversity of vent types identified here and their relative geographic isolation make the MCR unique in the oceans. These new sites offer prospects for an expanded range of vent-fluid compositions, varieties of abiotic organic chemical synthesis and extremophile microorganisms, and unparalleled faunal biodiversity-all in close proximity.},
	keywords = {HOV Alvin (Human Occupied Vehicle)},
	issn = {0027-8424},
	doi = {10.1073/pnas.1009205107},
	author = {German, C R and Bowen, A and Coleman, M L and Honig, D L and Huber, J A and Jakuba, M V and Kinsey, J C and Kurz, M D and Leroy, S and McDermott, J M and de Lepinay, B M and Nakamura, K and Seewald, J S and Smith, J L and Sylva, S P and Van Dover, C L and Whitcomb, L L and Yoerger, D R}
}
@article {Walter2010,
	title = {{Rapid dispersal of a hydrothermal plume by turbulent mixing}},
	journal = {Deep-Sea Research. Part I: Oceanographic Research Papers},
	volume = {57},
	number = {8},
	year = {2010},
	pages = {931{\textendash}945},
	abstract = {The water column imprint of the hydrothermal plume observed at the Nibelungen field (8{\textdegree}18'S 13{\textdegree}30'W) is highly variable in space and time. The off-axis location of the site, along the southern boundary of a non-transform ridge offset at the joint between two segments of the southern Mid-Atlantic Ridge, is characterized by complex, rugged topography, and thus favorable for the generation of internal tides, subsequent internal wave breaking, and associated vertical mixing in the water column. We have used towed transects and vertical profiles of stratification, turbidity, and direct current measurements to investigate the strength of turbulent mixing in the vicinity of the vent site and the adjacent rift valley, and its temporal and spatial variability in relation to the plume dispersal. Turbulent diffusivities K$\rho$K$\rho$ were calculated from temperature inversions via Thorpe scales. Heightened mixing (compared to open ocean values) was observed in the whole rift valley within an order of K$\rho$K$\rho$ around 10-3 m2 s-1. The mixing close to the vent site was even more elevated, with an average of View the MathML sourceK$\rho$=4{\texttimes}10-2m2s-1. The mixing, as well as the flow field, exhibited a strong tidal cycle, with strong currents and mixing at the non-buoyant plume level during ebb flow. Periods of strong mixing were associated with increased internal wave activity and frequent occurrence of turbulent overturns. Additional effects of mixing on plume dispersal include bifurcation of the particle plume, likely as a result of the interplay between the modulated mixing strength and current speed, as well as high frequency internal waves in the effluent plume layer, possibly triggered by the buoyant plume via nonlinear interaction with the elevated background turbulence or penetrative convection.},
	keywords = {AUV ABE (Autonomous Benthic Explorer)},
	issn = {0967-0637},
	doi = {10.1016/j.dsr.2010.04.010},
	url = {http://dx.doi.org/10.1016/j.dsr.2010.04.010},
	author = {Walter, M and Mertens, C and Stober, U and German, C R and Yoerger, D R and Sultemfub, J and Rhein, M and Melchert, B and Baker, E T}
}
@article {Haase2009,
	title = {{Diking, young volcanism and diffuse hydrothermal activity on the southern Mid-Atlantic Ridge: The Lilliput field at 9 degrees 33'S}},
	journal = {Marine Geology},
	volume = {266},
	number = {1-4},
	year = {2009},
	pages = {52{\textendash}64},
	keywords = {AUV ABE (Autonomous Benthic Explorer)},
	issn = {0025-3227},
	doi = {10.1016/j.margeo.2009.07.012},
	url = {http://dx.doi.org/10.1016/j.margeo.2009.07.012},
	author = {Haase, K M and Koschinsky, A and Petersen, S and Devey, C W and German, C R and Lackschewitz, K S and Melchert, B and Seifert, R and Borowski, C and Giere, O and Paulick, H}
}
@article {Breier2009,
	title = {{A suspended-particle rosette multi-sampler for discrete biogeochemical sampling in low-particle-density waters}},
	journal = {Deep-Sea Research. Part II: Topical Studies in Oceanography},
	volume = {56},
	number = {9},
	year = {2009},
	pages = {1579{\textendash}1589},
	keywords = {HOV Alvin (Human Occupied Vehicle), ROV Jason (Remotely Operated Vehicle)},
	issn = {0967-0645},
	doi = {10.1016/j.dsr.2009.04.005},
	url = {http://dx.doi.org/10.1016/j.dsr.2009.04.005},
	author = {Breier, J A and Rauch, C G and McCartney, K and Toner, B M and Fakra, S C and White, S N and German, C R}
}
@article {Melchert2008,
	title = {{First evidence for high-temperature off-axis venting of deep crustal/mantle heat: The Nibelungen hydrothermal field, southern Mid-Atlantic Ridge}},
	journal = {Earth and Planetary Science Letters},
	volume = {275},
	number = {1-2},
	year = {2008},
	pages = {61{\textendash}69},
	keywords = {AUV ABE (Autonomous Benthic Explorer)},
	issn = {0012-821X},
	doi = {10.1016/j.epsl.2008.08.010},
	url = {http://dx.doi.org/10.1016/j.epsl.2008.08.010},
	author = {Melchert, B and Devey, C W and German, C R and Lackschewitz, K S and Seifert, R and Walter, M and Mertens, C and Yoerger, D R and Baker, E T and Paulick, H and Nakamura, K}
}
@article {German2008,
	title = {{Hydrothermal exploration with the Autonomous Benthic Explorer}},
	journal = {Deep-Sea Research. Part I: Oceanographic Research Papers},
	volume = {55},
	number = {2},
	year = {2008},
	pages = {203{\textendash}219},
	keywords = {AUV ABE (Autonomous Benthic Explorer), AUV Sentry (Autonomous Underwater Vehicle), ROV DSL-120 (Remotely Operated Vehicle)},
	issn = {0967-0637},
	doi = {10.1016/j.dsr.2007.11.004},
	url = {http://dx.doi.org/10.1016/j.dsr.2007.11.004},
	author = {German, C R and Yoerger, D R and Jakuba, M V and Shank, T M and Langmuir, C H and Nakamura, K I}
}
@article {Yoerger2007b,
	title = {{Autonomous and remotely operated vehicle technology for hydrothermal vent discovery, exploration, and sampling}},
	journal = {Oceanography},
	volume = {20},
	number = {1},
	year = {2007},
	pages = {152{\textendash}161},
	keywords = {AUV ABE (Autonomous Benthic Explorer), ROV Jason (Remotely Operated Vehicle), ROV Medea (Remotely Operated Vehicle)},
	issn = {1042-8275},
	doi = {10.5670/oceanog.2007.89},
	author = {Yoerger, D R and Bradley, A M and Jakuba, M V and German, C R and Shank, T M and Tivey, M}
}
@article {Yoerger2007,
	title = {{Mid-ocean ridge exploration with an autonomous underwater vehicle}},
	journal = {Oceanography},
	volume = {20},
	number = {4},
	year = {2007},
	pages = {52{\textendash}61},
	keywords = {AUV ABE (Autonomous Benthic Explorer)},
	issn = {1042-8275},
	doi = {10.5670/oceanog.2007.05},
	author = {Yoerger, D R and Bradley, A M and Jakuba, M V and Tivey, M A and German, C R and Shank, T M and Embley, R W}
}
@book {German2006,
	title = {{RRS Charles Darwin Cruise 169, 17 Feb - 19 Mar 2005: Hydrothermal exploration of the southern Mid-Atlantic Ridge}},
	series = {National Oceanography Centre Southampton Cruise Report},
	year = {2006},
	pages = {92},
	publisher = {National Oceanography Centre Southampton},
	organization = {National Oceanography Centre Southampton},
	address = {Southampton, UK},
	keywords = {AUV ABE (Autonomous Benthic Explorer)},
	url = {http://eprints.soton.ac.uk/41274/},
	author = {German, C R and Parson, L M}
}
@inbook {German2004,
	title = {{Hydrothermal processes}},
	booktitle = {Treatise on geochemistry},
	volume = {6},
	year = {2004},
	pages = {181{\textendash}222},
	publisher = {Elsevier},
	organization = {Elsevier},
	address = {New York},
	isbn = {0080437516},
	author = {German, C R and Von Damm, K L},
	editor = {Turekian, K K}
}
@inbook {Fornari2004,
	title = {{Submarine lava flow emplacement at the East Pacific Rise 9 degrees 50{\textquoteright}N: Implications for uppermost ocean crust stratigraphy and hydrothermal fluid circulation}},
	booktitle = {Mid-ocean ridges: hydrothermal interactions between the lithosphere and ocean},
	series = {Geophysical Monograph},
	number = {148},
	year = {2004},
	pages = {187{\textendash}217},
	publisher = {American Geophysical Union},
	organization = {American Geophysical Union},
	address = {Washington, D.C.},
	isbn = {0875904130},
	author = {Fornari, D J and Tivey, M A and Schouten, H and Perfit, M R and Yoerger, D R and Bradley, A M and Edwards, M H and Haymon, R and Schreirer, D S and Von Damm, K L and Shank, T M and Soule, A},
	editor = {German, C R}
}
@article {Tyler2003,
	title = {{Understanding the biogeography of chemosynthetic ecosystems.}},
	journal = {Oceanologica Acta},
	volume = {25},
	number = {5},
	year = {2003},
	pages = {227{\textendash}241},
	issn = {0399-1784},
	doi = {10.1016/S0399-1784(02)01202-1},
	url = {http://dx.doi.org/10.1016/S0399-1784(02)01202-1},
	author = {Tyler, P A and German, C R and Ramirez-Llodra, E and Van Dover, C L}
}
@article {VanDover2002,
	title = {{Evolution and biogeography of deep-sea vent and seep invertebrates}},
	journal = {Science},
	volume = {295},
	number = {5558},
	year = {2002},
	pages = {1253{\textendash}1257},
	issn = {0036-8075},
	doi = {10.1126/science.1067361},
	url = {http://dx.doi.org/10.1126/science.1067361},
	author = {Van Dover, C L and German, C R and Speer, K G and Parson, L M and Vrijenhoek, R C}
}
@article {Humphris2002,
	title = {{Geotectonic setting of hydrothermal activity on the summit of Lucky Strike Seamount (37 degrees 17{\textquoteright}N, Mid-Atlantic Ridge)}},
	journal = {Geochemistry, Geophysics, Geosystems},
	volume = {3},
	number = {8},
	year = {2002},
	pages = {Article no. 1049},
	keywords = {HOV Alvin (Human Occupied Vehicle), ROV Argo (Remotely Operated Vehicle), ROV Jason (Remotely Operated Vehicle)},
	issn = {1525-2027},
	doi = {10.1029/2001GC000284},
	url = {http://dx.doi.org/10.1029/2001GC000284},
	author = {Humphris, S E and Fornari, D J and Schreirer, D S and German, C R and Parson, L M}
}
@article {Wilson1996,
	title = {{Hydrothermal anomalies in the Lucky Strike segment on the Mid-Atlantic Ridge (37 degrees 17{\textquoteright}N)}},
	journal = {Earth and Planetary Science Letters},
	volume = {142},
	number = {3-4},
	year = {1996},
	pages = {467{\textendash}477},
	keywords = {HOV Alvin (Human Occupied Vehicle)},
	issn = {0012-821X},
	doi = {10.1016/0012-821X(96)00100-8},
	url = {http://dx.doi.org/10.1016/0012-821X(96)00100-8},
	author = {Wilson, C and Charlou, J L and Ludford, E and Klinkhammer, G and Chin, C and Bougault, H and German, C R and Speer, K and Palmer, M}
}
@inbook {Campbell1994,
	title = {{Chemistry of hydrothermal fluids from the Escanaba Trough, Gorda Ridge}},
	booktitle = {Geologic, hydrothermal, and biologic studies at Escanaba Trough, Gorda Ridge, offshore Northern California},
	series = {U.S. Geological Survey Bulletin},
	number = {2022},
	year = {1994},
	pages = {201{\textendash}221},
	publisher = {U.S. Geological Survey},
	organization = {U.S. Geological Survey},
	address = {Reston, Va.},
	author = {Campbell, A C and German, C R and Palmer, M R and Gamo, T and Edmond, J M},
	editor = {Morton, J L}
}
@article {German1993,
	title = {{A geochemical study of metalliferous sediment from the TAG bydrothermal mound, 26 degrees 09{\textquoteright}N, Mid-Atlantic Ridge}},
	journal = {Journal of Geophysical Research},
	volume = {98},
	number = {B6},
	year = {1993},
	pages = {9683{\textendash}9692},
	keywords = {HOV Alvin (Human Occupied Vehicle)},
	issn = {0148-0227},
	doi = {10.1029/92JB01705},
	url = {http://dx.doi.org/10.1029/92JB01705},
	author = {German, C R and Higgs, N C and Thomson, J and Mills, R and Elderfield, H and Blusztajn, J and Fleer, A P and Bacon, M P}
}
