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  • 1
    Monograph available for loan
    Monograph available for loan
    Rotterdam : Balkema
    Call number: M 416
    Type of Medium: Monograph available for loan
    Pages: VIII, 375 S.
    ISBN: 9061910994
    Language: English
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 2
    Publication Date: 2019-03-20
    Type: Dataset
    Format: text/tab-separated-values, 234 data points
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  • 3
    Publication Date: 2019-03-20
    Type: Dataset
    Format: text/tab-separated-values, 99 data points
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  • 4
    Publication Date: 2019-03-20
    Type: Dataset
    Format: text/tab-separated-values, 30 data points
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  • 5
    Publication Date: 2018-09-28
    Type: Dataset
    Format: text/tab-separated-values, 182 data points
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  • 6
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 207 (1965), S. 1186-1187 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 The extent of the outcrops of pre-Quaternary systems proved so far is shown in the map (Fig. 1). All the outcrops have been proved by sampling! while many details of the boundaries have been taken from continuous reflexion traverses. The outcrop of the Magnesian Limestone offshore is based ...
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 243 (1973), S. 509-511 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] As part of a general geological survey we have determined the distribution of phosphate in 900 samples collected on a 10-mile grid extending from the coast to depths of 1,500?2,000 m (Fig. 1), allowing us to present a more detailed picture than hitherto possible of the distribution of phosphate and ...
    Type of Medium: Electronic Resource
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  • 8
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    Unknown
    In:  Erdöl & Kohle, Erdgas, Petrochemie, 33 (10). pp. 457-463.
    Publication Date: 2016-04-12
    Description: The continental margins of southern Africa were formed by three tectonic styles: rifted, sheared, and vertical motion. Large Mesozoic-Cenozoic sedimentary accumulations occur on these margins, and their stratigraphy and lithofacies are summarized in relation to taphrogenic (mid-Jurassic to Albian) and epeirogenic (Upper Cretaceous to Cenozoic) basin development and contemporaneous continental separation between Africa and South America (commenced ca. 140 my BP). The most extensive potential hydrocarbon source rock/reservoir combinations are reckoned to be upper Jurassic-Albian anoxic sediments with interbedded sands on prograding delta fronts. A less likely possibility is thought to be organic-rich Oligo-Neogene sediments that have been involved in large-scale slumps along the west coast.
    Type: Article , PeerReviewed
    Format: text
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  • 9
    Publication Date: 2016-04-08
    Description: 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.
    Type: Article , PeerReviewed
    Format: text
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  • 10
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    Unknown
    American Geophysical Union
    In:  In: Dynamics of Passive Margins. , ed. by Scrutton, R. A. Geodynamics series, 6 . American Geophysical Union, Washington, DC, pp. 59-71.
    Publication Date: 2016-04-11
    Description: Sedimentation rates (corrected for compaction) from along the passive continental margin of Africa between the Equatorial Fracture Zone and Somalia are used to compare the rates of subsidence of the continental crust since early Mesozoic time. Three distinctive subsidence histories can be identified which correspond with basinal areas that have different structural styles: rifted (west coast), sheared (Equatorial and Agulhas fracture zones) and sunk (zones of vertical tectonics in eastern Africa). A comparison of subsidence rates with other tensional margins (NE USA and the North Sea) and a consideration of the plate tectonic history of the African margins leads to the proposal of a geo and thermodynamic model that takes cognizance of the worldwide mid-Cretaceous rheological discontinuity between taphrogenic and epeirogenic basin formation recognized by Kent, and the more generally accepted, purely plate tectonic driven model of margin subsidence. The new suggestion involves a lower Mesozoic worldwide rise in the geothermal gradient in the lithosphere which produces metamorphism of the base of the continental crust and initiates taphrogenesis along lineaments throughout Gondwanaland. A lowering of the geothermal gradient in the lower Cretaceous produces a switch to epeirogenic subsidence, driven solely by sediment loading and thermal contraction, by Aptian/Albian times. The thermal event facilitated continental separation, and sea floor spreading commenced locally at various times along the active taphrogenic belts. Local thermal and tectonic aberrations associated with this phenomenon over print onto the worldwide pattern of marginal basin subsidence. A further rise in the geothermal gradient may have been responsible for renewed taphrogenesis in eastern Africa in Tertiary times.
    Type: Book chapter , NonPeerReviewed
    Format: text
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