A new gas-tight isobaric sampler for hydrothermal fluids |
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| Institution: | 1. Université Libre de Bruxelles (ULB), MRC, CP-165/62, 50, Ave. F.D. Roosevelt, B-1050 Brussels, Belgium;2. Tomsk Polytechnic University, Russia;1. Programa de Pós–graduação em Geociências, Universidade Federal do Rio Grande do Sul (UFRGS). Av. Bento Gonçalves, 9500 – Prédio 43129, Porto Alegre – RS, Brazil;2. Geochemical Research Center, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan;3. Earthquake Research Institute, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan;4. CONICET – Universidad Nacional de La Pampa, Uruguay 151 (6300), Santa Rosa, La Pampa, Argentina;5. Department of Physics, University of Surrey, Guildford GU2 7XH, UK;6. Instituto de Ciencias de la Tierra, Facultad de Ciencias, Universidad Austral de Chile, Valdivia, Código postal 5090000, Región de Los Ríos, Chile;7. Institut für Mineralogie, Westfählische–Wilhelms-Universität Münster, Germany;1. Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA;2. McLane Research Laboratories, E. Falmouth, MA 02536, USA;1. Yale University, Department of Geology and Geophysics, 210 Whitney Ave., New Haven, CT 06511, USA;2. University of Minnesota, Department of Earth Sciences, 310 Pillsbury Drive SE, Minneapolis, MN 55455-0231, USA;3. Monash University, Department of Earth, Atmosphere and Environment, 9 Rainforest Walk, Building 28, Clayton, VIC 3800, Australia;4. Princeton University, Department of Geosciences, Guyot Hall, Princeton, NJ 08544, USA;5. Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, CA 94720, USA |
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| Abstract: | A new gas-tight isobaric sampler for the collection of hydrothermal fluids venting at the seafloor has been designed, constructed, and tested at a ridge-crest vent site. The new device is constructed of chemically inert titanium, is gas-tight to 450 bar and can be used to sample fluids with temperatures up to 400°C. Compressed gas is used to maintain the sample at seafloor pressure before and during sample withdrawal onboard ship, allowing subsampling without degassing the fluid remaining in the sampler. This feature eliminates the need to collect separate gas-tight and major element samples since a single fluid sample can be analyzed quantitatively for major, trace, semi-volatile, and volatile components. The sampler fill rate is regulated to minimize entrainment of ambient seawater during collection of fluids from environments characterized by low fluid flow such as diffuse hydrothermal vents. In addition to deployment at the ridge-crest, the samplers can be used to collect gas-tight samples from other subseasurface environments such as hydrocarbon seeps, areas of methane-gas hydrate formation, cold seeps associated with serpentinites, regions of groundwater egress to the oceans, and the water column. |
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