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  1. Artikel: Iron Species Determination to Investigate Early Diagenetic Reactivity in Marine Sediments

    Haese, R. R. / Wallmann, K. / Dahmke, A. / Kretzmann, U. / Mueller, P. J. / Schulz, H. D.

    1997  , Seite(n) S. 63–72

    Schlagwörter Eisen ; Bestimmungsmethode ; Biochemische Reaktion ; Meeressediment ; Meeresboden ; Sedimentanalyse ; Sediment ; Kenngroesse ; Spektralanalyse ; Magnesium ; Mineralogie ; Mineral ; Porenwasser ; Konzentrationsmessung ; Extraktion ; Analysenverfahren ; Mineralstoff ; Tiefsee ; Erdgeschichte ; Eisenverbindung ; Meeresgeologie ; Speziation (Chemie) ; Chemische Umwandlung ; Stratigraphie ; Pyrit
    Sprache Englisch
    Dokumenttyp Artikel
    Datenquelle OPAC und UmweltLIteraturDATenbank (ULIDAT) des Umweltbundesamtes (UBA)

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  2. Artikel ; Online: Iron species determination to investigate early diagenetic reactivity in marine sediments

    Haese, R.R. / Wallmann, Klaus / Dahmke, A. / Kretzmann, U. / Müller, P.J. / Schulz, H.D.

    1997  

    Abstract: Iron speciation was determined in hemiplegic sediments from a high productivity area to investigate systematically the early diagenetic reactivity of Fe. A combination of various leaching agents (1 M HCI, dithionite buffered in citrate/acetic acid, HF/ ... ...

    Abstract Iron speciation was determined in hemiplegic sediments from a high productivity area to investigate systematically the early diagenetic reactivity of Fe. A combination of various leaching agents (1 M HCI, dithionite buffered in citrate/acetic acid, HF/H2SO4, acetic Cr(II)) was applied to sediment and extracted more than 80% of total Fe. Subsequent Fe species determination defined specific mineral fractions that are available for Fe reduction and fractions formed as products of Fe diagenesis. To determine the Fe speciation of (sheet) silicates we explored an extraction procedure (HF/H2SO4) and verified the procedure by application to standard rocks. Variations of Fe speciation of (sheet) silicates reflect the possible formation of Fe-bearing silicates in near surface sediments. The same fraction indicates a change in the primary input at greater depth, which is supported by other parameters. The Fe(II)/ Fe(III) -ratio of total sediment determined by extractions was compared with Mössbauer-spectroscopy ] at room temperature and showed agreement within 10%. M6ssbauer-spectroscopy indicates the occurrence of siderite in the presence of free sulfide and pyrite, supporting the importance of microenvironments during mineral formation. The occurrence of other Fe(II) bearing minerals such as ankerite (Ca-, Fe-, Mg-carbonate) can be presumed but remains speculative.
    Thema/Rubrik (Code) 550
    Sprache Englisch
    Verlag Elsevier
    Erscheinungsland de
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  3. Buch ; Online: Iron and carbon geochemistry of sediment core GeoB1401-4, supplementary data to: Haese, Ralf R; Wallmann, Klaus; Dahmke, Andreas; Kretzmann, U; M?ller, Peter J; Schulz, Horst D (1997): Iron species determination to investigate early diagenetic reactivity in marine sediments. Geochimica et Cosmochimica Acta, 61(1), 63-72

    Dahmke, Andreas / Haese, Ralf R / Kretzmann, U / M?ller, Peter J / Schulz, Horst D / Wallmann, Klaus

    1997  

    Abstract: Iron speciation was determined in hemiplegic sediments from a high productivity area to investigate systematically the early diagenetic reactivity of Fe. A combination of various leaching agents (1 M HCI, dithionite buffered in citrate/acetic acid, HF/ ... ...

    Abstract Iron speciation was determined in hemiplegic sediments from a high productivity area to investigate systematically the early diagenetic reactivity of Fe. A combination of various leaching agents (1 M HCI, dithionite buffered in citrate/acetic acid, HF/H2SO4, acetic Cr(II)) was applied to sediment and extracted more than 80% of total Fe. Subsequent Fe species determination defined specific mineral fractions that are available for Fe reduction and fractions formed as products of Fe diagenesis. To determine the Fe speciation of (sheet) silicates we explored an extraction procedure (HF/H2SO4) and verified the procedure by application to standard rocks. Variations of Fe speciation of (sheet) silicates reflect the possible formation of Fe-bearing silicates in near surface sediments. The same fraction indicates a change in the primary input at greater depth, which is supported by other parameters. The Fe(II)/ Fe(III) -ratio of total sediment determined by extractions was compared with M?ssbauer-spectroscopy ] at room temperature and showed agreement within 10%. M6ssbauer-spectroscopy indicates the occurrence of siderite in the presence of free sulfide and pyrite, supporting the importance of microenvironments during mineral formation. The occurrence of other Fe(II) bearing minerals such as ankerite (Ca-, Fe-, Mg-carbonate) can be presumed but remains speculative.

    REFERENCE:
    Haese, Ralf R (1997): Beschreibung und Quantifizierung fr?hdiagenetischer Reaktionen des Eisens in Sedimenten des S?datlantiks. Berichte aus dem Fachbereich Geowissenschaften der Universit?t Bremen, 99, 118 pp
    Sprache Englisch
    Erscheinungsverlauf 1997-9999
    Umfang Online-Ressource
    Verlag PANGAEA - Data Publisher for Earth & Environmental Science
    Erscheinungsort Bremen/Bremerhaven
    Dokumenttyp Buch ; Online
    Anmerkung This dataset is cited by urn:urn:nbn:de:gbv:46-ep000102231 ; This dataset is supplement to doi:10.1016/S0016-7037(96)00312-2
    DOI 10.1594/PANGAEA.730424
    Datenquelle Katalog der Technische Informationsbibliothek Hannover

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