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  • Geological Society of America (GSA)  (1)
  • [s.l.] : Wiley  (1)
  • 1
    Keywords: Sea-floor spreading.. ; Hydrothermal deposits.. ; Chemical oceanography.. ; Hydrothermal vents ; Electronic books ; Electronic books
    Description / Table of Contents: Published by the American Geophysical Union as part of the Geophysical Monograph Series.Diversity of Hydrothermal Systems on Slow Spreading Ocean Ridgespresents a multidisciplinary overview of the remarkable emerging diversity of hydrothermal systems on slow spreading ocean ridges in the Atlantic, Indian, and Arctic oceans. When hydrothermal systems were first found on the East Pacific Rise and other Pacific Ocean ridges beginning in the late 1970s, the community consensus held that the magma delivery rate of intermediate to fast spreading was necessary to support black smoker-type high-temperature systems and associated chemosynthetic ecosystems and polymetallic sulfide deposits. Contrary to that consensus, hydrothermal systems not only occur on slow spreading ocean ridges but, as reported in this volume, are generally larger, exhibit different chemosynthetic ecosystems, produce larger mineral deposits, and occur in a much greater diversity of geologic settings than those systems in the Pacific. The full diversity of hydrothermal systems on slow spreading ocean ridges, reflected in the contributions to this volume, is only now emerging and opens an exciting new frontier for ocean ridge exploration, includingProcesses of heat and chemical transfer from the Earth's mantle and crust via slow spreading ocean ridges to the oceansThe major role of detachment faulting linking crust and mantle in hydrothermal circulationChemical reaction products of mantle involvement including serpentinization, natural hydrogen, abiotic methane, and hydrocarbon synthesisGeneration of large polymetallic sulfide deposits hosted in ocean crust and mantleChemosynthetic vent communities hosted in the diverse settingsThe readership for this volume will include schools, universities, government laboratories, and scientific societies in developed and developing nations, including over 150 nations that have ratified the United Nations Convention on the Law of the Sea.
    Type of Medium: Online Resource
    Pages: Online Ressource (PDF, 54493 KB, 440 S.)
    Edition: 1. Aufl.
    ISBN: 0875904785
    Series Statement: Geophysical Monograph Series v.188
    DDC: 551.2309162
    Language: English
    Note: Description based upon print version of record , Title Page; Contents; Preface; Diversity of Hydrothermal Systems on Slow Spreading Ocean Ridges: Introduction; Emerging Diversity of Hydrothermal Systems on Slow Spreading Ocean Ridges; Hydrothermal Circulation at Slow Spreading Ridges: Analysis of Heat Sources and Heat Transfer Processes; Chemical Signatures From Hydrothermal Venting on Slow Spreading Ridges; The Magnetic Signature of Hydrothermal Systems in Slow Spreading Environments; Hydrothermal Activity at the Arctic Mid-Ocean Ridges , Implications of the Iceland Deep Drilling Project for Improving Understanding of Hydrothermal Processes at Slow Spreading Mid-OcCrustal Structure, Magma Chamber, and Faulting Beneath the Lucky Strike Hydrothermal Vent Field; The Relationships Between Volcanism, Tectonism, and Hydrothermal Activity on the Southern Equatorial Mid-Atlantic Ridge; The Ultraslow Spreading Southwest Indian Ridge; Deformation and Alteration Associated With Oceanic and Continental Detachment Fault Systems: Are They Similar? , Detachment Fault Control on Hydrothermal Circulation Systems:Interpreting the Subsurface Beneath the TAG HydrothermalField Using the Isotopic and Geological Evolutionof Oceanic Core Complexes in the AtlanticSerpentinization and Associated Hydrogen and Methane Fluxes at Slow Spreading Ridges; High Production and Fluxes of H2 and CH4 and Evidence of Abiotic Hydrocarbon Synthesis by Serpentinization in Ultramafic-Hosted Hydrothermal Systems on the Mid-Atlantic Ridge , Phase Equilibria Controls on the Chemistry of Vent Fluids From Hydrothermal Systems on Slow Spreading Ridges: Reactivity of Plagioclase and Olivine Solid Solutions and the pH-Silica ConnectionGeodiversity of Hydrothermal Processes Along the Mid-Atlantic Ridge and Ultramafic-HostedMineralization: A New Type of Oceanic Cu-Zn-Co-Au Volcanogenic Massive Sulfide Deposit; Hydrothermal Systems: A Decade of Discovery in Slow Spreading Environments; Chemosynthetic Communities and Biogeochemical Energy PathwaysAlong the Mid-Atlantic Ridge: The Case of Bathymodiolus Azoricus; Index
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  • 2
    Publication Date: 2012-01-01
    Description: The spreading axis at many slow-spreading mid-ocean ridges is marked by an axial volcanic ridge. In this study, we use a combination of high-resolution remote sensing methods to elucidate the detailed nature of volcanoes in such a ridge. We find that the “hummocks” described in previous sidescan sonar studies are dome- or cone-shaped edifices, 5–150 m high with diameters of 30–330 m. We estimate they form quickly, in single eruptions, each of which may produce several hummocks. Hummock collapse is common and hummocks of all heights are prone to failure. Collapses generally occur down the regional seafloor slope, suggesting control by local topography. Approximately 33% of hummocks lose ~40% of their volume by collapse, so ~12% of all material erupted on the axial volcanic ridge is rapidly converted to talus. The higher porosity of these deposits may increase average upper crustal porosity by several percent, contributing 〉0.5 km s-1 to seismic velocity decrease in the upper oceanic crust, and may be one of the dominant mechanisms for increasing porosity in upper slow-spreading oceanic crust.
    Print ISSN: 0091-7613
    Electronic ISSN: 1943-2682
    Topics: Geosciences
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