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  • 1
    ISSN: 1432-1157
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Erosional furrows are recognized on the seafloor off the Mississippi Delta, trending downslope over the shelf edge. They occur in water depths of 150 to 380 m seaward of presently active mudslides on the delta slope. The furrows cross an area of former mudslide deposition and part of the outer shelf. Their origin is likely to be related to cross-shelf secondary helical flows, although delta-front mass movement could cause similar erosional gouging.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Geo-marine letters 1 (1981), S. 7-10 
    ISSN: 1432-1157
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Flume observations of the consolidation of mud beds deposited from an unsteady flow show that 10-mm layer undergoes considerable consolidation during the time of deposition and within the first hour after deposition ceases, but little additional consolidation during the next 24 hr. A certain minimum thickness, between 3 and 10 mm, is required for any consolidation to occur. The results support the hypothesis that thick mud layers may form in nearshore subtidal areas as the result of accumulation of thinner layers deposited during successive tidal cycles, but only if each individual layer is able to withstand erosion during the subsequent cycle.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Geo-marine letters 1 (1981), S. 129-134 
    ISSN: 1432-1157
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The Solomon arc lacks subduction-associated volcanism in its eastern part. This anomalous absence arose from the collision of the submarine Ontong Java Plateau with the Solomon arc about 8 m.y. ago and a consequent flip in subduction. Collision was most forceful over the eastern half, so that the new, north-plunging slab of Indo-Australian plate remained in collisional contact with the thick oceanic crust (〉40 km) and lithosphere of the Ontong Java Plateau along a face of cooled depleted refractory mantle; there is no intervening asthenospheric wedge, and therefore no magma production.
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  • 4
    ISSN: 1432-1157
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Serpentinites and spilitic basalts recovered at depths of 1000 m from Ascension Submarine Canyon northwest of Monterey Bay, California indicate that Franciscan basement is present immediately to the west of the San Gregorio Fault. This new information, together with published geological/geophysical data, support previous suggestions that the offshore western boundary of the Salinian block (Sur-Nacimiento Fault) has been tectonically truncated by the San Gregorio Fault and has been displaced by as much as 90 km to the northwest since the mid-late Miocene.
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  • 5
    ISSN: 1432-1157
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Methane concentrations in some sediment cores from the Kodiak Shelf and adjacent continental slope increase with depth by three or four orders of magnitude and exceed the solubility in water at ambient conditions. Acoustic anomalies in seismic-reflection records imply that methane-rich sediment is widespread. Molecular composition of hydrocarbon gases and isotopic composition of methane indicate gas formation by shallow biogenic processes. Stratigraphic positions of acoustic anomalies in Quaternary glacial and posttransgressive sediments suggest that these units are likely sources of gas. A seep along the extension of a fault may be gas venting from a deeper thermogenic source.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Geo-marine letters 1 (1981), S. 155-161 
    ISSN: 1432-1157
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Artificial beach nourishment, the placing of sand onto eroded beaches, is increasingly employed by coastal engineers as an alternative to structural control of shoreline erosion. Man-made beaches approximating natural forms and processes offer greater protection against storms than eroded beaches and provide increased recreational opportunities. It is hoped that maintenance nourishment will keep pace with subsidence and eustatic rise in sea level, primary causes of beach erosion. Even though negative impacts of beach restoration may be short-lived and limited in scope, sound ecological engineering practices require careful monitoring of dredging operations.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Geo-marine letters 1 (1981), S. 169-172 
    ISSN: 1432-1157
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Fluids discharged from subaerial springs along faults on a sediment diapir near the mouth of the Mississippi River are derived from buried marine pore waters which have been extensively altered chemically by processes of bacterial respiration, mineral precipitation and, possibly, by fractionation due to the presence of clays of high exchange capacity. Vertical mass transport of dissolved components in many shallow marine sediments is controlled by long-term compaction, diffusion and bioturbation. In areas of rapid sediment deposition, however, these processes can be overwhelmed by catastrophic episodes of sediment failure, vertical mixing and upward discharge of water, gas and dissolved species.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Geo-marine letters 10 (1990), S. 1-4 
    ISSN: 1432-1157
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Geo-marine letters 1 (1981), S. 261-266 
    ISSN: 1432-1157
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Data are presented from a commercially available deep-tow 100-kHz side-scan sonar and 3.5-kHz subbottom profiler acquisition system. The towfish is a positively buoyant vehicle referenced to the seafloor with an anchor chain deadweight. This enables the acoustic sources and receivers to be towed at a constant altitude of 30 to 35 m above the seafloor. The records illustrate a capability for imaging deep-water seafloor morphology and near-surface sediments to water depths of 2200 m in the Gulf of Mexico.
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  • 10
    ISSN: 1432-1157
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Rivers in the western Gulf of Corinth have built gravelly fan deltas into waters 100–300 m deep. Seismic profiles (3.5 kHz) and gravity cores show that sand-filled channels extend seaward of modern distributary mouths and lead to sandy depositional lobes in deeper water. Much of the fan delta slope is underlain by mud. Closely spaced gullies cut the interchannel ridges on either side of the main channels. Incised slope valleys occur on east-facing slopes, where the wave fetch is greatest, and may be formed by rip-current-induced turbidity currents.
    Type of Medium: Electronic Resource
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