Spieß, Volkhard

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Spieß, Volkhard
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Spieß, Volkhard
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Spiess, Volkhard
Spieß, V.
Spiess, V.
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    Evolution of a buried moat–drift system in the Ewing Terrace uncovering highly dynamic bottom currents at the Argentine margin from the early Oligocene to middle Miocene
    (Society for Sedimentary Geology, 2024-11-23)
    Unland, Ellen
    ;
    Miramontes, Elda
    ;
    Spieß, Volkhard
    ;
    Bozzano, Graziella
    ;
    Kasten, Sabine
    The Ewing Terrace is a relatively flat surface formed by the action of bottom-currents and part of a Contourite Depositional System (CDS) at the Argentine continental slope. It is situated in a highly complex oceanographic setting at the Brazil-Malvinas Confluence Zone. Located in water depths of ~1000–1200 m and incised by the Mar del Plata Canyon, the Ewing Terrace is separated into the Northern Ewing Terrace (NET) and the Southern Ewing Terrace (SET). The long-term variations in ocean circulation led to a complex internal architecture of the terrace. As a result, this region represents a unique archive for studying sedimentary features that were eroded, transported, and deposited by along- and down-slope processes. An in-depth data analysis of high-resolution multichannel seismic profiles exhibits a complex sequence of erosional and depositional contouritic features, namely buried moat-drift systems identified in depths of ~ 370-750 m below the seafloor. They are arranged in migrating sequences and clustered in the Early Oligocene to Middle Miocene. This pattern is probably attributable to the vertical shift of water masses and to a highly dynamic oceanographic setting with spatial changes influenced by the Brazil-Malvinas Confluence Zone over this particular geological time. The moat-drift systems reveal significant lateral changes from north to south. In the southern area of the SET, the moats are constructional, and the associated separated mounded drifts are well developed. In contrast, the northern area exhibits two types of moats, reminiscent of cut-and-fill structures that mirror the significant and rapid changes in bottom current dynamics. With these new insights, this study contributes to a better understanding of moat-drift systems and improves the knowledge about past oceanographic dynamics and sediment deposition at the northern Argentine margin.
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    Report and Preliminary results of Meteor cruise M49/1 Cape Town (South Africa) - Montevideo (Uruguay) 04.01.2000 - 10.02.2000.
    (2003)
    Spieß, V.
    METEOR cruise M49/1 lasted from 04.01.2001 - 10.02.2001. The cruise started in Cape Town (South Africa) and ended in Montevideo (Uruguay). The aim of METEOR Cruise M49/1 was to support the proposal 'Early Cenozoic Extreme Climates - The Walvis Ridge Transect' for scientific drilling by the Ocean Drilling program. The main objectives of the ODP proposal are extreme climatic conditions in the Paleogene, dating utilizing astronomical cycles, and the reconstruction of the paleocanographic development. Poor recovery and drilling disturbances made previous drilling campaigns in the area (Leg 40, 1974; Leg 74, 1980) an only limited success, but the sediments recovered during these 1egs document the high quality of sediment cores and paleoceanographic records obtainable in the area. Primary targets of the new drilling proposa1 are the Latest Paleocene Thermal Maximum (55.5 Ma), the Early Eocene Climatic Optimum (51 Ma), and the Earliest Oligocene Glacial Maximum (33.4 Ma).
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    Report and preliminary results of METEOR-Cruise M 23/1, Kapstadt - Rio de Janeiro, 4.-25.2.1993.
    (1994)
    Spieß, V.
    METEOR Cruise 23 was projected to take samples fram the water column and the sea floor as well as to record the sediment structures using geoacoustic methods. The results will be integrated within the long-term special research project Sonderforschungsbereich 261, which aims at the reconstruction of mass budgets and current systems in the South Atlantic for late Quaternary times. Micropaleontological, geochemical, sedimentological, geophysical and isotopic characteristics of the sampled materials are determined both on board and subsequent to the cruise in the laboratories at Bremen University.During the first leg of METEOR Cruise No. 23 a transect through the Southern South Atlantic Ocean was performed at latitudes of 29°S to 37°S between South Africa and South America. The marine geologic, geochemical and geophysical studies were carried out on surface and cored sediment material collected at the South African Continental Margin, in the Cape Basin, on the Southern Walvis Ridge emd aerass the Mid-Atlantic Ridge. Continuous sediment and bathymetric echosounder data were recorded along the track to provide information about the structural and tectonie framework of the study areas. Figure 1 shows the ship's track and the 22 geologic, biologic and oceanographic sampling stations visited during METEOR Cruise M23/1.
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