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  • 11
    Series available for loan
    Series available for loan
    Washington, DC : United States Gov. Print. Off.
    Associated volumes
    Call number: SR 90.0002(456-C)
    In: Professional paper
    Type of Medium: Series available for loan
    Pages: IV, C-62 S.
    Series Statement: U.S. Geological Survey professional paper 456-C
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 12
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    In:  CASI
    Publication Date: 2013-08-31
    Description: The consensus regarding interpretation of Magellan radar imagery assigns Venus a young volcanic surface subjected in many areas to moderate crustal shortening. I infer that, on the contrary, ancient densely cratered terrain and large impact basins may be preserved over more than half the planet and that crustal shortening has been much overestimated. I see wind erosion and deposition as far more effective in modifying old structures. Integration with lunar chronology suggests that most of the surface of Venus may be older than 3.0 Ga and much may be older than 3.8 Ga. Broad volcanos, hug volcanic domes, plains preserving lobate flow patterns, and numerous lesser volcanic features, pocked sparsely by impact craters, are indeed obvious on Magellan imagery. Some of these postvolcanic impact craters have been slightly extended, but only a small portion has been flooded by still younger lavas. Relative ages of the young craters are indicated by the varying eolian removal of their forms and ejecta blankets and flow lobes, and the oldest are much subdued. If these young impact craters, maximum diameter 275 km, include all preserved impact structures, then their quantity and distribution indicate that Venus was largely resurfaced by volcanism approx. 0.5 Ga, subsequent eruptions having been at a much reduced rate. Away from the approx. 0.5 Ga volcanic features, much of Venus is, however, dominated by circular and subcircular features, 50-2000 km in diameter, many of them multiring, that may be mostly older impact and impact-melt structures substantially modified by wind action. Eolian erosion scoured to bedrock old ridges and uplands, including those that may be cratered terrains and the rims and outer-ring depressions of large impact basins, and removed all surficial deposits to the limits of resolution of the imagery. The complementary eolian deposits form not only dunes, wind streaks, and small plains, but also broad radar-dark plains, commonly assumed to be volcanic although lacking flow morphology, whose materials appear to be thick because they are smoothly compacted into buried craters.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Inst., International Conference on Large Meteorite Impacts and Planetary Evolution; p 33-35
    Format: application/pdf
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  • 13
    Publication Date: 1962-04-01
    Description: In the epicentral region in the Hebgen Lake earthquake, Montana, late Cenozoic structures marked by tension are superimposed on Laramide structures marked by compression. During the earthquake, several large normal faults NE. of Hebgen Lake, and many small faults and monoclines S. of ft, were reactivated, and a very large area was abruptly dropped and warped. New fault scarps are as high as 20 ft. They are mostly in unconsolidated or weakly coherent material but certainly reflect displacements of the underlying bedrock, Offsets produced by refraction of faults, which are steeper iii surficial material than in bedrock, and by various types of slumping, generally result in surficial scarps higher than true fault displacements. placements. Subsidence amounted to as much as 22 ft in the lake basin, as proved by releveling of bench marks by the Coast and Geodetic Survey and by shoreline measurements around Hebgen Lake. Parts of the basin subsided differentially, warping the lake bed and creating a gigantic long-lived seiche. Depth-sounding traverses of the lake recorded warping but gave no indication of major faulting of the lake bottom. A part of the Madison Valley, W. of Hebgen Lake, also subsided, though not as much, and a segment of the Madison Range fault was reactivated. At least part of the highway through Madison River Canyon, which cuts directly across the Madison Range between Hebgen Lake and Madison Valley, subsided also; one group of geologists regards this subsidence as tectonic, and considers the entire range, for which there are otherwise no positive data, to have subsided between Hebgen Lake and Madison Valley. In this view, an eastward trending syncline has been propagated across the NW.-trending Madison Range. Another group considers the subsidence in Madison River Canyon to be due in part to compaction and slumping, and the Madison Range to have changed little in altitude. The pattern of deformation appears to them as the uneven subsidence of 2 NW.-trending basins, one on either side of the Madison Range. The earthquake caused widespread slumping and sliding of the surficial mantle; the huge Madison Slide killed 26 people. An old earthflow was reactivated and moved 100 ft or more in the month following the earthquake.
    Print ISSN: 0037-1106
    Electronic ISSN: 1943-3573
    Topics: Geosciences
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  • 14
    Map available for loan
    Map available for loan
    Washington, DC
    Associated volumes
    Call number: MAP I-875-C K 08.0221 / R16
    In: Miscellaneous geologic investigations map
    Type of Medium: Map available for loan
    Pages: 1 Kt. : mehrfarb. ; 128 x 60 cm, gefaltet 22 x 19 cm im Umschlag
    Series Statement: Miscellaneous investigations series map I-875-C
    Location: Upper compact magazine
    Branch Library: GFZ Library
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