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  • AGU (American Geophysical Union)  (1)
  • Hoboken, NJ : John Wiley & Sons, Inc  (1)
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  • 1
    Online Resource
    Online Resource
    Gas hydrates 1 : fundamentals, characterization and modeling (2017)
    Hoboken, NJ : John Wiley & Sons, Inc | London : ISTE Ltd
    Details Availability
    Keywords: Natural gas Hydrates ; Natural gas Hydrates ; Natural gas ; Hydrates ; TECHNOLOGY & ENGINEERING ; Power Resources ; General
    Description / Table of Contents: Gas hydrates, or clathrate hydrates, are crystalline solids resembling ice, in which small (guest) molecules, typically gases, are trapped inside cavities formed by hydrogen-bonded water (host) molecules. They form and remain stable under low temperatures - often well below ambient conditions - and high pressures ranging from a few bar to hundreds of bar, depending on the guest molecule. Their presence is ubiquitous on Earth, in deep-marine sediments and in permafrost regions, as well as in outer space, on planets or comets. In addition to water, they can be synthesized with organic species as host molecules, resulting in milder stability conditions: these are referred to as semi-clathrate hydrates. Clathrate and semi-clathrate hydrates are being considered for applications as diverse as gas storage and separation, cold storage and transport and water treatment. This book is the first of two edited volumes, with chapters on the experimental and modeling tools used for characterizing and predicting the unique molecular, thermodynamic and kinetic properties of gas hydrates (Volume 1) and on gas hydrates in their natural environment and for potential industrial applications (Volume 2)
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource
    ISBN: 1119332680 , 1119427436 , 9781119332688 , 9781119427438
    Series Statement: Energy series
    URL: http://onlinelibrary.wiley.com/book/10.1002/9781119332688
    URL: https://onlinelibrary.wiley.com/doi/book/10.1002/9781119332688
    DOI: 10.1002/9781119332688
    Language: English
    Note: Includes bibliographical references and index
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  • 2
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    Pore water geochemistry at two seismogenic areas in the Sea of Marmara (2015)
    AGU (American Geophysical Union) | Wiley
    In:  Geochemistry, Geophysics, Geosystems, 16 . pp. 2038-2057.
    Details
    Publication Date: 2018-04-27
    Description: Within the Sea of Marmara, the highly active North Anatolian Fault (NAF) is responsible for major earthquakes (Mw ≥ 7), and acts as a pathway for fluid migration from deep sources to the seafloor. This work reports on pore water geochemistry from three sediment cores collected in the Gulfs of Izmit and Gemlik, along the Northern and the Middle strands of the NAF, respectively. The resulting data set shows that anaerobic oxidation of methane (AOM) is the major process responsible for sulfate depletion in the shallow sediment. In the Gulf of Gemlik, depth concentration profiles of both sulfate and alkalinity exhibit a kink-type profile. The Sulfate Methane Transition Zone (SMTZ) is located at moderate depth in the area. In the Gulf of Izmit, the low concentrations observed near the seawater-sediment interface for sulfate, calcium, strontium, and magnesium result from rapid geochemical processes, AOM, and carbonate precipitation, occurring in the uppermost part of the sedimentary column and sustained by free methane accumulation. Barite dissolution and carbonate recrystallization have also been identified at deeper depth at the easternmost basin of the Gulf of Izmit. This is supported by the profile of the strontium isotope ratios (87Sr/86Sr) as a function of depth which exhibits negative anomalies compared to the modern seawater value. The strontium isotopic signature also shows that these carbonates had precipitated during the reconnection of the Sea of Marmara with the Mediterranean Sea. Finally, a first attempt to interpret the sulfate profiles observed in the light of the seismic activity at both sites is presented. We propose the hypothesis that seismic activity in the areas is responsible for the transient sulfate profile, and that the very shallow SMTZ depths observed in the Gulf of Izmit is likely due to episodic release of significant amount of methane.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1002/2015GC005798
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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