@article {Koschinsky2014,
	title = {{Metal concentrations in the tissues of the hydrothermal vent mussel Bathymodiolus: Reflection of different metal sources}},
	journal = {Marine Environmental Research},
	volume = {95},
	year = {2014},
	pages = {62{\textendash}73},
	abstract = {Hydrothermal vent mussels of the genus Bathymodiolus are ideally positioned for the use of recording hydrothermal fluxes at the hydrothermal vent sites they inhabit. Barium, Ca, Cd, Co, Cr, Cu, Fe, K, Mg, Mn, Mo, Pb, Sr, and U concentrations in tissue sections of Bathymodiolus mussels from several hydrothermal fields between 15{\textdegree}N and 9{\textdegree}S at the Mid-Atlantic Ridge were determined and compared to the surrounding fluids and solid substrates in the habitats. Elements generally enriched in hydrothermal fluids, such as Fe, Cu, Zn, Pb and Cd, were significantly enriched in the gills and digestive glands of the hydrothermal mussels. The rather small variability of Zn (and Mn) and positive correlation with K and earth alkaline metals may indicate a biological regulation of accumulation. Enrichments of Mo and U in many tissue samples indicate that particulate matter such as hydrothermal mineral particles from the plumes can play a more important role as a metal source than dissolved metals. Highest enrichments of Cu in mussels from the Golden Valley site indicate a relation to the >=400 {\textdegree}C hot heavy-metal rich fluids emanating in the vicinity. In contrast, mussels from the low-temperature Lilliput field are affected by the Fe oxyhydroxide sediment of their habitat. In a comparison of two different sites within the Logatchev field metal distributions in the tissues reflected small-scale local variations in the metal content of the fluids and the particulate material.},
	keywords = {ROV Jason (Remotely Operated Vehicle)},
	issn = {0141-1136},
	doi = {10.1016/j.marenvres.2013.12.012},
	url = {http://www.sciencedirect.com/science/article/pii/S0141113613002249},
	author = {Koschinsky, A and Kausch, M and Borowski, C}
}
@article {Schmidt2011,
	title = {{Fluid elemental and stable isotope composition of the Nibelungen hydrothermal field (8 degrees18{\textquoteright}S, Mid-Atlantic Ridge): Constraints on fluid-rock interaction in heterogeneous lithosphere}},
	journal = {Chemical Geology},
	volume = {280},
	number = {1-2},
	year = {2011},
	pages = {1{\textendash}18},
	abstract = {Depending on the geological setting, the interaction of submarine hydrothermal fluids with the host rock leads to distinct energy and mass transfers between the lithosphere and the hydrosphere. The Nibelungen hydrothermal field is located at 8{\textdegree}18'S, about 9~km off-axis of the Mid-Atlantic Ridge (MAR). At 3000~m water depth, 372~{\textdegree}C hot, acidic fluids emanate directly from the bottom, without visible sulfide chimney formation. Hydrothermal fluids obtained in 2009 are characterized by low H2S concentrations (1.1~mM), a depletion of B (192~$μ$M) relative to seawater, lower Si (13.7~mM) and Li (391~$μ$M) concentrations relative to basaltic-hosted hydrothermal systems and a large positive Eu anomaly, and display a distinct stable isotope signature of hydrogen (∆2HH2O~=~7.6{\textendash}8.7{\textperthousand}) and of oxygen (∆18OH2O~=~2.2{\textendash}2.4{\textperthousand}). The heavy hydrogen isotopic signature of the Nibelungen fluids is a specific feature of ultramafic-hosted hydrothermal systems and is mainly controlled by the formation of OH-bearing alteration minerals like serpentine, brucite, and tremolite during pervasive serpentinization. New isotopic data obtained for the ultramafic-hosted Logatchev I field at 14{\textdegree}45'N, MAR (∆2HH2O~=~3.8{\textendash}4.2{\textperthousand}) display a similar trend, being clearly distinguished from other, mafic-hosted hydrothermal systems at the MAR. The fluid geochemistry at Nibelungen kept stable since the first sampling campaign in 2006 and is evident for a hybrid alteration of mafic and ultramafic rocks in the subseafloor. Whereas the ultramafic-fingerprint parameters Si, Li, B, Eu anomaly and ∆2HH2O distinguish the Nibelungen field from other hydrothermal systems venting in basaltic settings at similar physico-chemical conditions and are related to the interaction with mantle rocks, the relatively high concentrations of trace alkali elements, Pb, and Tl can only be attributed to the alteration of melt-derived gabbroic rocks. The elemental and isotopic composition of the fluid suggest a multi-step alteration sequence: (1) low- to medium-temperature alteration of gabbroic rocks, (2) pervasive serpentinization at moderate to high temperatures, and (3) limited high-temperature interaction with basaltic rocks during final ascent of the fluid. The integrated water/rock ratio for the Nibelungen hydrothermal system is about 0.5. The fluid compositional fingerprint at Nibelungen is similar to the ultramafic-hosted Logatchev I fluids with respect to key parameters. Some compositional differences can be ascribed to different alteration temperatures and other fluid pathways involving a variety of source rocks, higher water/rock ratios, and sulfide precipitation in the sub-seafloor at Logatchev I.},
	keywords = {ROV Jason (Remotely Operated Vehicle)},
	issn = {0009-2541},
	doi = {10.1016/j.chemgeo.2010.07.008},
	url = {http://dx.doi.org/10.1016/j.chemgeo.2010.07.008},
	author = {Schmidt, K and Garbe-Schonberg, D and Koschinsky, A and Strauss, H and Jost, C L and Klevenz, V and Koniger, P}
}
