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  • 1
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    Monitoring Underground Nuclear Explosions (1977)
    Elsevier
    In:  Amsterdam, 440 pp., Elsevier, vol. 231, no. 3, pp. 2-203, (ISBN 0-470-02298-1)
    Details
    Publication Date: 1977
    Keywords: Textbook of geophysics ; Nuclear explosion ; Seismology
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Trace metal distribution in Baltic Sea ferromanganese concretions: inferences on accretion rates (1977)
    Elsevier
    In:  Earth and Planetary Science Letters, 35 (1). pp. 49-54.
    Details
    Publication Date: 2017-01-19
    Description: The usually high concentrations of Zn, Pb, Cd, and Cu in the most recently accreted portions of ferromanganese nodules from the western Baltic Sea are thought to reflect increased metal input due to anthropogenic mobilization. If so, the point of increase represents a time horizon within the structure of the nodule. Similar trace metal distributions of radiometrically dated sediments from the same area suggest that the ferromanganese nodules have grown in thickness between 0.02 and 0.16 mm yr−1. From this growth rate anthropogenic Zn flux to the nodule surface was calculated to be 80 mg m−2 yr−1.
    Type: Article , PeerReviewed
    Format: text
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    PAPER (OCEANREP)
  • 3
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    Mineralogy, chemistry and crystallization sequence of clay minerals in altered tholeiitic basalts from the Peru Trench (1977)
    Elsevier
    In:  Earth and Planetary Science Letters, 36 (3). pp. 413-422.
    Details
    Publication Date: 2016-09-12
    Description: Petrographic examination of amygdules and veins associated with moderately altered pillow basalts dredged from the Peru Trench has revealed that a consistent pattern of mineral crystallization has occurred. This sequence is: (1) green, weakly pleochroic clay (R.I. 〉 1.56); (2) dark yellowish brown, non-pleochroic clay (R.I. 〉 1.56); (3) light yellowish brown to colorless, fibrous, weakly pleochroic clay (R.I. 〈 1.56); and (4) calcite or celadonite. Chemical and X-ray diffraction analyses suggest that all clay mineral amygdule and vein fillings are dominated by intimate mixtures of an Fe-rich saponite and nontronite with very small admixtures of serpentine and illite. It is argued that sequential mineral fillings of fractures and vesicles may provide significant information about the chemistry of circulating interstitial fluids. For the pillow basalts studied the first-formed clays were enriched in nontronite, thereby suggesting Fe-rich fluids. These in turn were followed by saponite-rich clays and calcite. The change from Fe-and Mg-rich fluids to dominantly Ca-rich fluids is thought to correspond to a change from mafic mineral alteration to plagioclase alteration in the pillow basalts. An increase in the Fe3+/Fe2+ ratio of clays toward the centers of vesicles may indicate a change toward a more oxidizing environment of alteration.
    Type: Article , PeerReviewed
    Format: text
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  • 4
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    Abyssal bedforms explored with a deeply towed instrument package (1977)
    Elsevier
    In:  Marine Geology, 23 (1-2). pp. 57-75.
    Details
    Publication Date: 2020-12-08
    Description: Several types of abyssal bedforms have been discovered during surveys with a deeply towed instrument package at water depths of 1.5–6 km in the Pacific and Atlantic Oceans. Cores and current-meter records obtained at the same sites provide data for interpreting their dynamics. Wave and current ripples are best portrayed in bottom photographs, but medium-scale bedforms, including sand waves, mud waves and erosional furrows, are described by interpreting high-resolution side-looking sonar records. The largest examples affect surface-ship echograms, though their shape and structure can seldom be resolved without near-bottom observations. Wave ripples are common on the slopes of seamounts and ridges, while current ripples and sand waves occur beneath some fast thermohaline currents whose beds are shallower than the foraminiferal compensation depth. Depositional and erosional bedforms in cohesive sediment have been found beneath the deepest thermohaline currents; they may be restricted to areas where the flow is unusually steady in direction.
    Type: Article , PeerReviewed
    Format: text
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