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  • Weitere Quellen  (19)
  • Elsevier  (14)
  • American Chemical Society
  • Annual Reviews
  • U.S. Geological Survey
  • 1980-1984  (12)
  • 1975-1979  (7)
  • 1984  (12)
  • 1978  (7)
  • 1
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    Seismic Migration. Imaging of Acoustic Energy by Wave Field Extrapolation. B. Practical Aspects (1984)
    Elsevier
    In:  Amsterdam, Elsevier, vol. 14 B, pp. 225, (ISBN 3-7643-7011-4)
    Details
    Publikationsdatum: 1984
    Schlagwort(e): Applied geophysics ; seismic Migration ; Seismics (controlled source seismology) ; Acoustics
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    BIBLIOGRAFIE SEISMOLOGIE
  • 2
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    Fundamentals of Well-log Interpretation - 1. The Acquisition of Logging Data (1984)
    Elsevier
    In:  Amsterdam, Elsevier, vol. Developments in Petroleum Science vol. 15A, no. Publ. No. 12, pp. 9, (ISBN: 0-12-636380-3)
    Details
    Publikationsdatum: 1984
    Schlagwort(e): Borehole geophys. ; Textbook of geophysics ; GFZ ; RUB ; GMG ; 3.45.8 ; UniL ; IfGuG ; in ; Französisch
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    BIBLIOGRAFIE SEISMOLOGIE
  • 3
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    Constitution of Earth's Interior (1984)
    Elsevier
    In:  Amsterdam, Elsevier, vol. 81A and 81B, no. 22, pp. 65-70, (1405101733, 336 p.)
    Details
    Publikationsdatum: 1984
    Schlagwort(e): Textbook of geophysics ; Earth model, also for more shallow analyses !
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    BIBLIOGRAFIE SEISMOLOGIE
  • 4
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    Source characteristics and strong ground motion of New Madrid earthquakes (1984)
    U.S. Geological Survey
    In:  Bull., Open-File Report, Proc. Symposium on The New Madrid Seismic Zone, Luxembourg, U.S. Geological Survey, vol. 14, no. 84-770, pp. 330-352, (ISBN 0080419208)
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    Publikationsdatum: 1984
    Schlagwort(e): Seismology ; Source parameters ; Strong motions ; Source
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    BIBLIOGRAFIE SEISMOLOGIE
  • 5
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    Seismic pattern recognition (1978)
    Elsevier
    In:  Professional Paper, Computer-aided seismic analysis and discrimination, Washington, D. C., Elsevier, vol. 16, no. 16, pp. 133-146, (ISBN 1-86239-165-3, vi + 330 pp.)
    Details
    Publikationsdatum: 1978
    Schlagwort(e): Data analysis / ~ processing ; Discrimination ; Seismics (controlled source seismology) ; Pattern recognition ; Detectors
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    BIBLIOGRAFIE SEISMOLOGIE
  • 6
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    High-resolution group velocity analysis (1978)
    Elsevier
    In:  Bull., Polar Proj. OP-O3A4, Computer-Aided Seismic Analysis and Discrimination, London, Elsevier, vol. 16, no. 4, pp. 97-109, (ISBN 0080419208)
    Details
    Publikationsdatum: 1978
    Schlagwort(e): Earthquake ; Seismics (controlled source seismology) ; Discrimination ; Velocity analysis
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    BIBLIOGRAFIE SEISMOLOGIE
  • 7
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    The seismicity of the New Madrid seismic zone (1984)
    U.S. Geological Survey
    In:  Open-File Report, Kiel, U.S. Geological Survey, vol. C 560, 183 pp., no. 84-770, pp. 267-278, (ISBN 3-933346-037)
    Details
    Publikationsdatum: 1984
    Schlagwort(e): Seismology ; Seismicity
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    BIBLIOGRAFIE SEISMOLOGIE
  • 8
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    The central Mississippi Valley earthquakes of 1811-1812, in Proc. Symposium on The New Madrid Seismic Zone (1984)
    U.S. Geological Survey
    In:  Open-File Report, Stavanger, U.S. Geological Survey, vol. 339-350, no. 84-770, pp. 33-62, (ISBN 3-933346-037)
    Details
    Publikationsdatum: 1984
    Schlagwort(e): Earthquake ; Source parameters ; Seismology
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    BIBLIOGRAFIE SEISMOLOGIE
  • 9
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    Quantifying Biostratigraphic Correlation (1978)
    Annual Reviews
    In:  Annual Review of Earth and Planetary Sciences, 6 (1). pp. 353-375.
    Details
    Publikationsdatum: 2020-06-09
    Materialart: Article , PeerReviewed
    Format: text
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  • 10
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    Bathymetry and stratigraphy of the northern Natal Valley (SW Indian Ocean): A preliminary account (1978)
    Elsevier
    In:  Marine Geology, 28 (1-2). pp. 89-106.
    Details
    Publikationsdatum: 2016-04-12
    Beschreibung: Thick sediments (maximum of at least 4900 m) infill the Natal Valley, which lies between the coast of South Africa/Mozambique and the Mozambique Ridge. Eight physiographic provinces are recognised in the valley, and their boundaries can be related to well-defined sediment thickness or facies discontinuities within the basin infill. The acoustic stratigraphy of the area is established by reference to two regionally developed reflecting horizons, which, on the basis of previously published borehole and seismic data, are tentatively identified as mid-Cretaceous (McDuff) and mid-Cainozoic (Angus) hiatuses or important facies boundaries. Sedimentation began in the Natal Valley before mid-Cretaceous times and since then sediment dispersion has been strongly influenced by the disposition of large basement (? volcanic) highs: the approximately NE—SW Almirante Leite and Naudé ridges, and the larger N—S Mozambique Ridge. There is abundant evidence that sedimentation in the vicinity of these ridges has been current-controlled since at least mid-Cainozoic (Angus) times. The two main terrigenous sediment input points have been the Tugela and Limpopo rivers, which have large sediment cones adjacent to their mouths.
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  • 11
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    Effect of natural concentrations on nutrient exchange between a polychaete burrow in estuarine sediment and the overlying water (1984)
    Elsevier
    In:  Journal of Experimental Marine Biology and Ecology, 75 (2). pp. 171-190.
    Details
    Publikationsdatum: 2016-04-25
    Beschreibung: The exchange of inorganic nutrients; ammonium, nitrate and reactive phosphate between burrows of the infaunal polychaete Nereis virens Sars and the overlying water was assessed using V-shaped sediment cores. Exchange was determined by monitoring ventilation current and nutrient concentration of in- and excurrent water. Ammonium supply appeared independent of overlying water concentrations, showing a constant release of 0.5 μmol·h−1 (for a 2-g individual + burrow system) at concentrations from 2 to 87 μM. Of this release ≈40% originated from worm excretion, and the rest from microbial mineralization. Nitrate and phosphate exchange appeared very sensitive to overlying water concentrations, having equilibrium (zero flux) at 10–15 and 3 μM, respectively. Below these concentrations nitrate showed a slight release (due to nitrification), whereas phosphate was released at a rate of 3.2 × 10−2 μmol·h−1 at 1 μM (mineralization and desorption). Above equilibrium they both were removed during water passage through worm burrows, reaching 0.4 μmol·h−1 for nitrate at 107 μM (nitrate reduction) and 3.7 × 10−2 μmol·h−1 for phosphate at 5.6 μM (adsorption processes). The burrow system apparently acted as a buffer for phosphate and, to some degree, nitrate in the overlying water. At the study site (Norsminde Fjord estuary) nereid burrows were estimated to increase the sediment-water interface 150%. About 17% of the water column was cycled through the sediment by Nereis each day. The worm + burrow system was estimated to release 95 μmol· m−2·h−1 ammonium to the overlying water, which was ≈76–90% of the total release of ammonium from the sediment (30–36% was worm excretion).
    Materialart: Article , PeerReviewed
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  • 12
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    Late Mesozoic and Tertiary sediment supply to the eastern Cape Basin (SE Atlantic) and palaeo-drainage systems in Southwestern Africa (1984)
    Elsevier
    In:  Marine Geology, 56 (1-4). pp. 13-26.
    Details
    Publikationsdatum: 2016-04-08
    Beschreibung: Isopach asymmetry, and sediment component changes in DSDP cores from the SE Atlantic (Orange Basin) support the hypothesis of major drainage system changes in SW Africa during late Cretaceous—Cenozoic time. This involved alternations in the use of the 28°S (modern Orange River) and 31°S (modern Olifants River) exit points across the western escarpment by rivers carrying run-off from the Upper Orange/Vaal catchment areas, as well as radical re-organizations of internal drainage geometry. It is postulated that during late Cretaceous times the 28°S exit was used, with the Middle Orange River following a course in the interior well to the south (up to 150 km) of its modern channel. Sediment discharge rates from this river were relatively high (at least 10 × 106 m3 yr−1), and resulted in rapid advancement of the continental margin sediment prism west of the mouth by large-scale slumping. The Palaeogene Orange/Vaal river exit was via the 31°S escarpment crossing, and during the later part of this period, the Cape Canyon was cut across the continental shelf and slope. A significant reduction in sediment discharge (to 2.0 × 106 m3 yr−1) suggests that the Lower Tertiary climate for SW Africa was drier than that of late Cretaceous times. However, aridity did not commence until late Miocene times, when the Orange/Vaal discharge had switched back to the 28°S exit. Modern sediment discharge rates (6.5 × 106 m3 yr−1) are relatively high and reflect soil erosion caused by agricultural activity. The two major alterations in exit point of the Orange/Vaal (late Cretaceous—early Tertiary, and late Oligocene—early Miocene) are related to periods of low sea level, which promoted river capture adjacent to the western escarpment. An additional factor in the first course change may have been the disruption of the Middle Orange channel by late Cretaceous igneous intrusions. Less important internal reorganizations of the drainage system are postulated in late Miocene—Pleistocene times. Economic implications for offshore diamond distribution are briefly mentioned.
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  • 13
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    Glacial Inception and Disintegration During the Last Glaciation (1978)
    Annual Reviews
    In:  Annual Review of Earth and Planetary Sciences, 6 (1). pp. 205-228.
    Details
    Publikationsdatum: 2020-06-09
    Beschreibung: The causes of the growth and collapse of the large Pleistocene ice sheets is a topic of intense scientific debate. The amount of new data and ideas has been prodigious during the last ten years. This review concentrates on the shifting patterns of glacial advance and shrinkage during the last Glaciation. We also examine reconstructions of conditions during the maximum of this Glaciation about 18,000 BP, and the mechanisms that might have caused the rapid collapse of many of the world's ice sheets between 18,000 and 8000 BP. Our paper focuses on the North Atlantic sector because it is there that the major Pleistocene ice sheets grew, developed, and retreated.
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  • 14
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    The distribution of Hg, Ba, Cu and Zn in the vicinity of cupriferous sulfide deposits, Troodos complex, Cyprus (1984)
    Elsevier
    In:  Journal of Geochemical Exploration, 21 (1-3). pp. 167-174.
    Details
    Publikationsdatum: 2016-05-30
    Beschreibung: A geochemical rock- and soil-sampling program was carried out in the vicinity of eight concealed “Cyprus type” deposits, occurring in marginal mafic to intermediate metapillow lavas of the Troodos Ophiolite Complex. The mineralization of massive and stockwork sulfide ore is characterized by the predominance of pyrite, intergrown with less chalcopyrite and minor amounts of sphalerite. Background values of Hg are in the range of 8–12 ppb for soils and 3–6 ppb for surface rocks. Anomaly/background ratios of 10:1 (soils) and 5:1 (rocks) have been found only, where Hg migrated along channels formed by faults cutting shallow-seated mineralization. Here, Hg sometimes shows significant correlations with Cu, Zn, Ba and exceptionally with Co. However in one case an Hg anomaly in soils and surface rocks was detected directly over a deposit. The use of Hg as indicator element for these types of deposits is therefore limited. Buried mineralization may be delineated more distinctly by Cu, Zn and Ba.
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  • 15
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    Glacial to interglacial changes in carbonate and clay sedimentation in the Atlantic Ocean estimated from 230Th measurements (1984)
    Elsevier
    In:  Isotope Geoscience, 46 (2). pp. 97-111.
    Details
    Publikationsdatum: 2016-07-08
    Beschreibung: The cause of the climatically controlled fluctuations in the carbonate content of deep-sea sediments remains the subject of uncertainty and debate. Three variables are involved: supply of biogenic carbonate, loss by dissolution, and dilution by non-carbonate phases. It is suggested that 230Th, which is produced in the ocean at a constant rate provides a reliable reference for measuring variations in rate of sedimentation on a regional scale. Results of a preliminary analysis based on published data indicate that, for depths at and above the lysocline, the carbonate fluctuations observed in cores from the North Atlantic Ocean are due primarily to variations in the terrigenous clay input, which was 2–5 times higher during glacials than during interglacials. Carbonate deposition appears to have been somewhat reduced during glacials, but probably not by more than a factor of 2. From published 230Th232Th profiles it appears that the South Atlantic Ocean also received increased inputs of terrigenous clay during glacial periods.
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  • 16
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    The importance of carbonate content in the acoustic stratigraphy of Panama Basin (1984)
    Elsevier
    In:  Marine Geology, 54 (3-4). pp. 237-247.
    Details
    Publikationsdatum: 2016-09-05
    Beschreibung: DSDP cores from areas of low (Site 505) and high heat flow (Site 504 B) near the Costa Rica Rift, together with seismic profiles from the Panama Basin, have been studied to determine the relationship between: (1) carbonate content and physical and acoustic properties; and (2) carbonate content, carbonate diagenesis and acoustic stratigraphy. Except for ash and chert layers, bulk density correlates strongly and linearly with carbonate content. Velocity is uniform downcore and only small variations at a small scale are measured. Thus an abrupt change in carbonate content will cause abrupt changes in acoustic impedance and should cause reflectors that can be detected acoustically. A comparison of seismic profiler reflection records with physical properties, carbonate content and reflection coefficients indicates that the main reflectors can be identified with ash layers, diagenetic boundaries, and carbonate content variations. Diagenesis of carbonate sediments is present at Site 504 B in a 260 m-thick ooze—chalk—limestone/chert sequence. These diagenetic sequences occur in areas of higher heat flow (200 mW m−2). Seismic profiler records can be used to map the extent and depth of these diagenetic boundaries.
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  • 17
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    Fractionation and mantle heterogeneity in basalts from the Peru-Chile Trench (1978)
    Elsevier
    In:  Earth and Planetary Science Letters, 37 (3). pp. 409-420.
    Details
    Publikationsdatum: 2016-09-09
    Beschreibung: Five separate exposures of oceanic basalts were dredged in the vicinity of the Peru-Chile Trench between 9° and 27°S latitude. Each dredge is dominated by abundant pillow basalts. Approximately ten of the most unaltered, glassy and fine-grained samples were selected for detailed chemical and petrographic analyses from each dredge area. All basalts recovered in the Peru-Chile Trench are olivine and quartz-normative tholeiites that are believed to have formed at the now extinct Galapagos Rise 30–50 m.y. ago. Detailed chemical analyses of the basalts, including major and selected trace and rare earth elements, indicate that considerable compositional variability exists both within each of the dredged areas as well as between areas. Most of the inherent chemical variability observed within particular basement sections appears consistent with the concept of temporal evolution of magma bodies at a former spreading center by shallow-level fractional crystallization involving primarily plagioclase and olivine. In contrast, important chemical differences between the dredged areas suggest compositional heterogeneities in the mantle source regions. Our results indicate that although shallow-level fractionation has brought about large changes in composition of basalts in each area, compositional trends are distinct and appear to reflect original mantle-derived compositional differences.
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  • 18
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    Chemical and optical studies of glass shards in Pleistocene and Pliocene ash layers from DSDP site 192, Northwest Pacific Ocean (1978)
    Elsevier
    In:  Journal of Volcanology and Geothermal Research, 4 (1-2). pp. 99-116.
    Details
    Publikationsdatum: 2016-09-09
    Beschreibung: Thirty-four ash layers of Pleistocene and Pliocene age from DSDP Site 192, northwestern Pacific Ocean, have been subjected to detailed chemical and optical study to evaluate: (1) the chemical and optical variability in glass shards from deep-sea ash layers, and (2) secondary changes brought about by prolonged exposure to seawater. Glass shards from approximately half of the ash layers studied were found to have uniform compositions which approach the precision of the microprobe chemical analyses, whereas the remainder are compositionally diverse (e.g., SiO2, variations of 5–15% among shards from the same ash layer) and appear to be the eruptive products of compositionally zoned magma chambers. Optical studies of glass shards confirm the absence of devitrification or the formation of pervasive secondary alteration products. By contrast, chemical studies suggest that the glass shards have experienced progressive hydration with possible minor ion exchange of K, Mg, Ca and Si. The hydration occurs rapidly and leads to a rather uniform water content of 4.5–5% after several hundred thousands of years exposure to seawater. Step-wise heating dehydration experiments, optical effects, and published'oxygen isotope studies indicate that the water of hydration is incorporated uniformly within the glass. Systematic chemical differences between electron microprobe analyses of glass shard interiors and corresponding bulk chemical study by atomic absorption lead us to postulate that glass shard margins have undergone a minor chemical exchange with major cations in seawater. They have gained 0.10–0.20 wt. % K20, MgO, and CaO while losing a corresponding amount of Si2O. Although the glass shards from DSDP Site 192 are hydrated and may have experienced subtle, surficial ion exchange, we stress that they are the most chemically representative samples available of magmas that were explosively erupted from volcanic arcs.
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  • 19
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    Wave-formed structures and paleoenvironmental reconstruction (1984)
    Elsevier
    In:  Marine Geology, 60 (1-4). pp. 165-198.
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    Publikationsdatum: 2020-04-27
    Beschreibung: Wave-formed sedimentary structures can be powerful interpretive tools because they reflect not only the velocity and direction of the oscillatory currents, but also the length of the horizontal component of orbital motion and the presence of velocity asymmetry within the flow. Several of these aspects can be related through standard wave theories to combinations of wave dimensions and water depth that have definable natural limits. For a particular grain size, threshold of particle movement and that of conversion from a rippled to flat bed indicate flow-velocity limits. The ratio of ripple spacing to grain size provides an estimate of the length of the near-bottom orbital motion. The degree of velocity asymmetry is related to the asymmetry of the bedforms, though it presently cannot be estimated with confidence. A plot of water depth versus wave height (h—H diagram) provides a convenient approach for showing the combination of wave parameters and water depths capable of generating any particular structure in sand of a given grain size. Natural limits on wave height and inferences or assumptions regarding either water depth or wave period based on geologic evidence allow refinement of the paleoenvironmental reconstruction. The assumptions and the degree of approximation involved in the different techniques impose significant constraints. Inferences based on wave-formed structures are most reliable when they are drawn in the context of other evidence such as the association of sedimentary features or progradational sequences.
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