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  • 1
    Series available for loan
    Series available for loan
    Stuttgart : Schweizerbart
    Associated volumes
    Call number: S 90.0073(76)
    In: Geotektonische Forschungen
    Type of Medium: Series available for loan
    Pages: 180 S.
    ISBN: 3510500423
    ISSN: 0016-8548
    Series Statement: Geotektonische Forschungen 76
    Language: German
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 2
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    In:  , 4 pp.
    Publication Date: 2018-08-16
    Description: SO-244 Leg 1, GeoSea 02.11. – 08.11.2015
    Type: Report , NonPeerReviewed
    Format: text
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  • 3
    Publication Date: 2017-11-09
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , NonPeerReviewed
    Format: application/pdf
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  • 4
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    LMU (u.a.)
    In:  [Talk] In: GeoMunich 2011 Fragile Earth, Geological Processes from Global to Local Scales, 04.09.-07.09.2011, München . Geomunich 2011 Fragile Earth, Geological Processes from Global to Local Scales, Associated Hazards & Resources : Munich, Germany, September 4-7, 2011 ; 100th Annual Meeting of Geologische Vereinigung ; 163rd Annual Meeting of Deutsche Gesellschaft für Geowissenschaften ; A3 .
    Publication Date: 2012-02-23
    Description: Expeditions 17/1 and 17/2 of R/V Maria S. Merian, carried out geophysical surveys between November 2010 and February 2011 in the area around Walvis Ridge, Southeast Atlantic Ocean. Among the data collected, reflection seismic and high-resolution bathymetric data offer some important preliminary insights into the tectonic evolution of the ridge and the adjoining lower continental slopes and ocean basins. The NE-SW trending Walvis Ridge has a trapezoid shape and is likely built up by thick sequences of plateau basalts, with top of basement inclined to the south. Sediments are almost absent on the NW side of the ridge, preserving a fascinating mountainscape formed early in the tectonic history. Sediment cover grows southward to thicknesses up to 2 s TWT, above a basement characterized by dipping reflector sequences inclined NW. There is progressive northward onlap of sedimentary strata, indicating that in the earlier part of its history parts of Walvis Ridge may have formed a land surface. This is further supported by denudational features, like steep cliffs up to 150 m high, and deeply incised valleys, defining paleo-drainages. Isolated, flat-topped guyots seaward of the ocean-continent boundary attest to a later history of wave abrasion and progressive subsidence of Walvis Ridge. The boundary zone towards the Angola Basin to the north is an important extensional or transtensional tectonic feature, conincident with the Florianopolis Fracture Zone on the Brazilian side of the Atlantic. The fault zone has recorded two important episodes of vertical differential movement, documented by thick half-graben fills and clastic sediment aprons on the Angola Basin crust. The early one is likely connected to continental break-up. The later one probably occurred in the Middle Tertiary, also affecting the SE side of Walvis Ridge. We conclude by stating that the record of sedimentary and geomorphologic processes around Walvis Ridge can contribute important information to decipher the tectonic history of the southeast Atlantic.
    Type: Conference or Workshop Item , NonPeerReviewed
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  • 5
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    In:  [Poster] In: AGU Fall Meeting 2011, 05.-09.12.2011, San Francisco, USA .
    Publication Date: 2012-02-23
    Type: Conference or Workshop Item , NonPeerReviewed
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  • 6
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    In:  [Poster] In: IGCP585 5. International Symposium, Submarine Mass Movements and Their Consequences, 24.-26.10.2011, Kyoto, Japan .
    Publication Date: 2012-02-23
    Type: Conference or Workshop Item , NonPeerReviewed
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  • 7
    Publication Date: 2019-01-21
    Description: Detrital fission-track studies on sedimentary basins surrounding eroding mountain belts provide a powerful tool to reconstruct exhumation histories of the source area. However, examples from active arc-trench systems are sparse. In this study, we report detrital apatite fission-track (AFT) data from Holocene and Pleistocene turbiditic trench and modern river sediments at the Chilean margin (36°S-47°S). Sediment petrography and detrital AFT data point to different major sediment sources, underlining the need for multidisciplinary studies: whereas sediment petrography indicates the erosion of large volumes of volcanic detritus, no such volcanic signal is seen in the detrital age pattern. Areally subordinate plutonic units are identified as the main, often unique sources. This result has important implications for studies of fossil systems, where the feeder areas are eroded, and where the youngest age population is often interpreted to indicate active volcanism. For the southernmost part of the study area in the Patagonian Andes, where the source area is mainly composed of granitoids, the sediment is derived from only small portions along the main divide, pointing to focused glacial erosion there. Our detrital AFT data show no exhumational signal that could be related to the subduction of the actively spreading Chile Ridge at c. 47°S and to the opening of a slab window beneath the South American Plate.
    Type: Article , PeerReviewed
    Format: text
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  • 8
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    Springer
    In:  In: Submarine mass movements and their consequences. , ed. by Yamada, Y., Kawamura, K., Ikehara, K., Ogawa, Y., Urgeles, R., Mosher, D., Chaytor, J. and Strasser, M. Springer, Dordrecht, pp. 463-474. ISBN 978-94-007-2161-6
    Publication Date: 2018-03-15
    Description: Ursa Basin on the Gulf of Mexico continental slope is a site of extremely fast sedimentation, building thick sequences of underconsolidated and overpressured muds and clays. Frequent sliding created mass transport deposits (MTD). In a study of strength, frictional behaviour, and fabrics of IODP Expedition 308 drillcores we find that mass transport is governed by very low friction coefficients and peak shear strengths of the sediments. The majority of the samples shows velocity weakening, enabling runaway instabilities in the sediment once deformation has started. While sediments at the bases of MTD seem to strengthen by the sliding, those below the bases remain weak, constraining a hazard for slide reactivation. Submarine sediment sliding leaves a strong and irreversible imprint, changing fabric geometries, and reducing the pore space. This is a transport phenomenon leading to expulsion of large amounts of pore fluids during sliding. MTD transport is probably as cohesive bodies, defining a considerable geohazard potential.
    Type: Book chapter , NonPeerReviewed
    Format: text
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  • 9
    Publication Date: 2018-07-10
    Description: Dependent on the ‘intrinsic’ effects on the crystal lattice of the rock constituents and the diminishing ‘extrinsic’ effects of pores and microcracks, elastic wave velocity versus pressure trends in cracked rocks are characterized by non-linear velocity increase at low pressure. At high pressure the ‘extrinsic’ influence vanishes and the velocity increase becomes approximately linear. Usually, the transition between non-linear and linear behaviour, the ‘crack closure pressure’, is not accessible in an experiment, because actual equipment is limited to lower pressure. For this reason, several model functions for describing velocity—pressure trends were proposed in the literature to extrapolate low-pressure P-wave velocity measurements to high pressures and, in part, to evaluate the ‘intrinsic’ velocity—pressure trend from low-pressure data. Knowing the ‘intrinsic’ velocity trend is of particular importance for the quantification of the crack influence at low pressure, at high pressure, the ‘intrinsic’ trend describes the velocity trend as a whole sufficiently well. Checking frequently used model functions for suitability led to the conclusion that all relations are unsuitable for the extrapolation and, if applicable, the estimation of the ‘intrinsic’ velocity trend. However, it can be shown that the ‘intrinsic’ parameters determined by means of a suitable model function, the zero pressure velocity and the pressure gradient depend on maximum experimental pressure in a non-linear way. Our approach intends to obtain better estimates of particular parameters from observed non-linear behaviour. A converging exponential function is used to approximate particular trends, assuming that the point of convergence of the function represents a better estimate of the zero pressure velocity and the pressure gradient, respectively. Whether the refined ‘intrinsic’ velocity trend meets the ‘true intrinsic’ velocity trend within acceptable errors cannot be proven directly due to missing experimental data at very high pressure. We, therefore, conclude that our approach cannot ensure absolutely certain ‘intrinsic’ velocity trends, however, it can be shown that the optimized trends approximate the ‘true intrinsic’ velocity trend better as all the other relations do.
    Type: Article , PeerReviewed
    Format: text
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  • 10
    Publication Date: 2018-10-16
    Type: Article , NonPeerReviewed
    Format: text
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