A segment-scale survey of the Broken Spur hydrothermal plume |
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| Institution: | 1. Southampton Oceanography Centre, Empress Dock, Southampton SO14 3ZH, UK;2. Department of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, UK;3. College of Ocean & Atmospheric Sciences, OSU, Corvallis, OR 97331, USA;1. Institut für Endlagerforschung, Hydrogeologie, TU Clausthal, Leibnizstraße 10, D-38678 Clausthal-Zellerfeld, Germany;2. Institut für Geologie und Paläontologie, Erdölgeologie, TU Clausthal, Leibnizstraße 10, D-38678 Clausthal-Zellerfeld, Germany;1. Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan;2. Institute for Chemical Research, Kyoto University, Kyoto 611-0011, Japan;3. Graduate School of Environmental Science, University of Shiga Prefecture, Hikone 522-8533, Japan;4. Ocean Research Institute, The University of Tokyo, Nakano, Tokyo 164-8639, Japan;5. Department of Science and Technology, University of the Ryukyus, Okinawa 903-0213, Japan;6. Graduate School of Science, Kanazawa University, Kanazawa 920-1192, Japan;1. Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal;2. Institut Jean Lamour, UMR 7198 CNRS-Université de Lorraine BP 50840, F-5401 Nancy, France;3. Consorzio RFX, 35127 Padova, Italy;4. Associazione EURATOM-ENEA-CR Frascati, 00044 Frascati, Italy;1. Department of Earth and Atmospheric Sciences, National Institute of Technology, Rourkela 769008, India;2. Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur 721302, India;1. Federal University of Minas Gerais, Chemistry Department, Belo Horizonte, MG, Brazil;2. Federal Institute of Education, Science and Technology of Piaui, Teresina, PI, 64053-390, Brazil;3. Federal University of Piaui, Center of Natural Sciences, Chemistry Department, Teresina, PI, 64049-550, Brazil;4. Mineradora Pedras Congonhas, Nova Lima, MG, Brazil |
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| Abstract: | We conducted a segment-scale hydrothermal plume survey of the Broken Spur segment, 29°00-20′N, Mid-Atlantic Ridge (MAR). The purpose of the study was to identify the distribution of sources of venting throughout the segment as part of a larger study of hydrothermal fluxes. Evidence from plume particle concentrations (as deduced from in situ nephelometer data) and total dissolvable Mn (TDMn) analyses (from discrete water samples) indicated a restricted source of venting close to the segment centre, coincident with the previously known vent-site. No other pronounced plume signals were observed outside an area bounded by 29°07.5–12.5′N and 43°10–12′W, representing less than 10% of the >300 km2 of deep water (>2600 m) within the segment. In addition, however, low-level (<2 nmol l-1) deepwater TDMn concentrations reveal a pervasive enrichment throughout the segment of ?0.15 nmol l-1. For the 4×1011 m3 of deepwater within the Broken Spur segment, this corresponds to a standing crop of 6×104 mol of hydrothermal Mn. Future studies of long-term current flow will allow the flux of dissolved Mn out of the segment to be established and will investigate the partitioning of its source, between high temperature and axial diffuse flow. |
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