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  • 1
    Call number: S 90.0095(362)
    In: Special paper / The Geological Society of America, 362
    Type of Medium: Series available for loan
    Pages: VI, 230 Seiten , Illustrationen, graphische Darstellungen, Karten
    ISBN: 0-8137-2362-0
    Series Statement: Special paper / The Geological Society of America 362
    Language: English
    Note: Preface 1. Characteristics of volcanic rifted margins Martin A. Menzies, Simon L. Klemperer, Cynthia J. Ebinger, and Joel Baker 2. Crust and upper mantle structure in East Africa: Implications for the origin of Cenozoic rifting and volcanism and the formation of magmatic rifted margins Andrew A. Nyblade 3. Development of the Lebombo rifted volcanic margin of southeast Africa M.K. Watkeys 4. Extension and uplift of the northern Rio Grande Rift: Evidence from ⁴⁰Ar/³⁹Ar geochronology from the Sangre de Cristo Mountains, south-central Colorado and northern New Mexico Daniel P. Miggins, Ren A. Thompson, Charles L. Pillmore, Lawrence W. Snee, and Charles R. Stern 5. Lithospheric mantle beneath Arabia: A Pan-African protolith modified by the Afar and older plumes, rather than a source for continental flood volcanism? Joel Baker, Gilles Chazot, Martin A. Menzies, and Matthew Thirlwall 6. Petrogenesis of the Late Cretaceous tholeiitic magmatism in the passive margins of northeastern Madagascar Leone Melluso, Vincenzo Morra, Pietro Brotzu, Massimo D'Antonio, and Lucia Bennio 7. Silicic volcanism: An undervalued component of large igneous provinces and volcanic rifted margins Scott E. Bryan, Teal R. Riley, Dougal A. Jerram, Christopher J. Stephens, and Philip T Leat 8. Volcanology and fades architecture of flood basalts Dougal A. Jerram 9. East Greenland coast-parallel dike swarm and its role in continental breakup Martin Bromann Klausen and Hans Christian Larsen 10. Crustal architecture of South Atlantic volcanic margins W.U. Mohriak, B.R. Rosendahl, J.P. Turner, and S.C. Valente 11. Volcanic passive margin of Namibia: A potential fields perspective B. Corner, J. Cartwright, and R. Swart 12. Petrophysical modeling of high seismic velocity crust at the Namibian volcanic margin R.B. Trumbull, S.V. Sobolev, and K. Bauer
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 2
    Publication Date: 2020-02-12
    Description: The formation of iron (Fe) nanoparticles and increase in Fe reactivity in mineral dust during simulated cloud processing was investigated using high-resolution microscopy and chemical extraction methods. Cloud processing of dust was experimentally simulated via an alternation of acidic (pH 2) and circumneutral conditions (pH 5-6) over periods of 24 h each on presieved (〈20 mu m) Saharan soil and goethite suspensions. Microscopic analyses of the processed soil and goethite samples reveal the neo-formation of Fe-rich nanoparticle aggregates, which were not found initially. Similar Fe-rich nanoparticles were also observed in wet-deposited Saharan dusts from the western Mediterranean but not in dry-deposited dust from the eastern Mediterranean. Sequential Fe extraction of the soil samples indicated an increase in the proportion of chemically reactive Fe extractable by an ascorbate solution after simulated cloud processing. In addition, the sequential extractions on the Mediterranean dust samples revealed a higher content of reactive Fe in the wet-deposited dust compared to that of the dry-deposited dust. These results suggest that large variations of pH commonly reported in aerosol and cloud waters can trigger neo-formation of nanosize Fe particles and an increase in Fe reactivity in the dust
    Language: English
    Type: info:eu-repo/semantics/article
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