984 resultados para Thomas, Abel C. (Abel Charles), 1807-1880.
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t.19 (1869)
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t.6 (1856)
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t.9 (1858-1859)
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t.3 (1852-1853)
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We have measured the concentrations of (1) pore-water sulfide and (2) solid-phase pyrite, iron monosulfide (=acid volatile sulfide), elemental sulfur, and extractable and nonextractable organic ("kerogen") sulfur in sediments from Ocean Drilling Program (ODP) Sites 680 and 686. Pore-water sulfide defines classic "bell-shaped" profiles. Maximum concentrations of 6 to 12 mM occur where sulfate is exhausted, or is most depleted, at depths between 15 and 50 mbsf. Sulfide resulting from bacterial sulfate reduction reacts in three ways: (1) some is reoxidized to elemental sulfur in surface sediments; (2) some reacts with detrital iron minerals to form iron monosulfide and pyrite, primarily in the top meter or two of the sediment; and (3) some reacts with, and is incorporated into, kerogen. Incorporation of reduced sulfur into kerogen occurs over the top 15 m of the sediment at both Sites 680 and 686, after the main phase of pyrite formation. Up to 45% of the total sedimentary sulfur is organically bound, and concentrations of 12 wt% sulfur are reached in the kerogen. These values are like those measured in lithologically similar, but more deeply buried, sediments from the Monterey Formation.
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Disbound Original Held in Oak Street Library Facility
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Charles A. Wolverton, chairman.
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Mode of access: Internet.
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"Reprinted from the Physical review, n. s., vol. XVI, no. 4, October, 1920."
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"Centenary edition ..."
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Mode of access: Internet.
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Mode of access: Internet.
