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  • 1
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    Sedimentary and tectonic evolution of Lake Ohrid (Macedonia/Albania) (2014)
    Wiley-Blackwell
    Details
    Publikationsdatum: 2014-02-12
    Beschreibung: Lake Ohrid, located on the Balkan Peninsula within the Dinaride-Albanide-Hellenide mountain belt, is a tectonically active graben within the South Balkan Extensional Regime (SBER). Interpretation of multichannel seismic cross sections and bathymetric data reveals that Lake Ohrid formed during two main phases of deformation: (1) a transtensional phase which opened a pull-apart basin, and (2) an extensional phase which led to the present geometry of Lake Ohrid. After the initial opening, a symmetrical graben formed during the Late Miocene, bounded by major normal faults on each side in a pull-apart type basin. The early-stage geometry of the basin has a typical rhomboidal shape restricted by two sets of major normal faults. Thick undisturbed sediments are present today at the site where the acoustic basement is deepest, illustrating that Lake Ohrid is a potential target for drilling a long and continuous sediment core for studying environmental changes within the Mediterranean region. Neotectonic activity since the Pliocene takes place along the roughly N-S striking Eastern and Western Major Boundary Normal Faults that are partly exposed at the present lake floor. The tectono-sedimentary structure of the basin is divided in three main seismic units overlying the acoustic basement associated with fluvial deposits and lacustrine sediments. A seismic facies analysis reveals a prominent cyclic pattern of high- and low amplitude reflectors. We correlate this facies cyclicity with vegetation changes within the surrounding area that are associated with glacial/interglacial cycles. A clear correlation is possible back to ~450 kyrs. Extrapolation of average sedimentation rates for the above mentioned period results in age estimate of ~ 2 Myrs for the oldest sediments in Lake Ohrid. This article is protected by copyright. All rights reserved.
    Print ISSN: 0950-091X
    Digitale ISSN: 1365-2117
    Thema: Geologie und Paläontologie
    Publiziert von Wiley-Blackwell
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  • 2
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    Reaction of a polar gravel‐spit system to atmospheric warming and glacier retreat as reflected by morphology and internal sediment geometries (South Shetland Islands, Antarctica) (2019)
    Wiley
    In:  EPIC3Earth Surface Processes and Landforms, Wiley, 44(5), pp. 1148-1162, ISSN: 0197-9337
    Details
    Publikationsdatum: 2019-04-29
    Beschreibung: Sedimentary architecture and morphogenetic evolution of a polar bay-mouth gravel-spit system are revealed based on topographic mapping, sedimentological data, radiocarbon dating and ground-penetrating radar investigations. Data document variable rates of spit progradation in reaction to atmospheric warming synchronous to the termination of the last glacial re-advance (LGR, 0.45–0.25 ka BP), the southern hemisphere equivalent of the Little Ice Age cooling period. Results show an interruption of spit progradation that coincides with the proposed onset of accelerated isostatic rebound in reaction to glacier retreat. Spit growth resumed in the late 19th century after the rate of isostatic rebound decreased, and continues until today. The direction of modern spit progradation, however, is rotated northwards compared with the growth axis of the early post-LGR spit. This is interpreted to reflect the shift and strengthening in the regional wind field during the last century. A new concept for the interplay of polar gravel-spit progradation and glacio-isostatic adjustment is presented, allowing for the prediction of future coastal evolution in comparable polar settings.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev , info:eu-repo/semantics/article
    Format: application/pdf
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  • 3
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    Sedimentary architecture and late Holocene dynamics of a polar gravel spit (King George Island, Antarctic Peninsula) (2017)
    DGGV and DMG
    In:  EPIC3GeoBremen2017, The System Earth and its Materials - from Seafloor to Summit, Universität Bremen, 2017-09-24-2017-09-29DGGV and DMG
    Details
    Publikationsdatum: 2018-08-10
    Beschreibung: Sedimentary architecture and late Holocene development of a polar bay-mouth gravel spit system are presented based on ground-penetrating radar data, historical aerial images and radiocarbon dating. The spit is situated at the mouth of a tributary fjord formed by a tide water glacier and developed under the circumstances of an overall sea level fall. The system comprises two distinct marine terraces, situated below 0.8 m and at 3 to 5.7 m above present mean sea level. The upper terrace developed around 0.4 ka cal BP. It comprises several beach ridges formed by packages of seaward-dipping beds delimited by erosional unconformities. Beach ridges situated towards the more exposed western part of the spit facing the main fjord are internally characterized by convex aggradational bedding pattern. The lower terrace is located inside the bay in a more sheltered situation and comprises several curved beach ridges internally characterized by seaward-dipping beds delimited by erosional unconformities. The upper terrace is nowadays subjected to erosion and an up to 5 m high cliff developed towards the main fjord. There is a distinct shift in the direction of spit progradation through time, which we see as a reaction to intensified wave action at the beach and the retreat of the adjacent tide-water glacier. Furthermore, the lower terrace showed accelerated progradation during the last decades, probably in reaction to a reduction in annual sea-ice coverage, a lowering of the rate of glacioisostatic uplift and the subsequent stabilization of sea level, and an increased sediment availability.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Conference , notRev
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  • 4
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    A multi-proxy analysis of Late Quaternary ocean and climate variability for the Maldives, Inner Sea (2017)
    In:  EPIC3Climate of the Past, 13(12), pp. 1791-1813, ISSN: 1814-9332
    Details
    Publikationsdatum: 2017-12-13
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev
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  • 5
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    Large scale architecture of a stacked Holocene spit – the stratigraphy of northern Sylt (southern North Sea) 〈BR〉[Großmaßstäbliche Architektur eines holozänen Nehrungshakens – die Stratigrafie von Nord-Sylt (südliche Nordsee).] (2013)
    In:  EPIC3Zeitschrift der Deutschen Gesellschaft für Geowissenschaften, 164(1), pp. 63-79, ISSN: 18601804
    Details
    Publikationsdatum: 2017-10-23
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev
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  • 6
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    Ground-penetrating radar data from polar gravel beaches along the coasts of Potter Peninsula, King George Island, Western Antarctica (2013)
    PANGAEA
    In:  EPIC3Bremerhaven, PANGAEA
    Details
    Publikationsdatum: 2019-07-17
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: PANGAEA Documentation , notRev
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  • 7
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    Distribution and characteristics of marine habitats in a subpolar bay based on hydroacoustics and bed shear stress estimates - Potter Cove, King George Island, Antarctica (2014)
    Springer
    In:  EPIC3Geo-Marine Letters, Springer, 34(5), pp. 435-446, ISSN: 0276-0460
    Details
    Publikationsdatum: 2018-08-10
    Beschreibung: Marine habitats worldwide are increasingly pressurized by climate change, especially along the Antarctic Peninsula. Well-studied areas in front of rapidly retreating tidewater glaciers like Potter Cove are representative for similar coastal environments and, therefore, shed light on habitat formation and development on not only a local but also regional scale. The objective of this study was to provide insights into habitat distribution in Potter Cove, King George Island, Antarctica, and to evaluate the associated environmental processes. Furthermore, an assessment concerning the future development of the habitats is provided. To describe the seafloor habitats in Potter Cove, an acoustic seabed discrimination system (RoxAnn) was used in combination with underwater video images and sediment samples. Due to the absence of wave and current measurements in the study area, bed shear stress estimates served to delineate zones prone to sediment erosion. On the basis of the investigations, two habitat classes were identified in Potter Cove, namely soft-sediment and stone habitats that, besides influences from sediment supply and coastal morphology, are controlled by sediment erosion. A future expansion of the stone habitat is predicted if recent environmental change trends continue. Possible implications for the Potter Cove environment, and other coastal ecosystems under similar pressure, include changes in biomass and species composition.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev , info:eu-repo/semantics/article
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  • 8
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    Carbonate drifts as marine archives of aeolian dust (Santaren Channel, Bahamas) (2019)
    International Association of Sedimentologists
    In:  EPIC3Sedimentology, International Association of Sedimentologists, 66, pp. 1386-1409, ISSN: 0037-0746
    Details
    Publikationsdatum: 2019-05-05
    Beschreibung: Sediment data from the Bahamian Santaren carbonate drift reveal the variability of trans-Atlantic Saharan dust transport back to about 100 ka BP (Marine Isotope Stage 5-3) and demonstrate that carbonate drifts are a valuable pelagic archive of aeolian dust flux. Carbonate drift bodies are common around tropical carbonate platforms; they represent large-scale accumulations of ocean-current transported material, which originates from the adjacent shallow-water carbonate factory as well as from pelagic production, i.e. periplatform ooze. Subordinately, there is a clay-size to silt-size non-carbonate fraction, which typically amounts to less than 10% of the sediment volume and originates from aeolian and fluvial input. Sedimentation rates in the 5.42 m long core GeoHH-M95-524 recovered 25 km west of Great Bahama Bank in the Santaren Channel ranges from 1-5 to 24.5 cm ka-1 with lowest values during the last glacial lowstand and highest values following platform re-flooding around 8 ka BP. These sedimentation rates imply that carbonate drifts have not only the potential to resolve long-term environmental changes on orbital timescales, but also millennial to centennial fluctuations during interglacials. The sediment core has been investigated with the aim of characterizing the lithogenic dust fraction. Laboratory analyses included X-ray fluorescence core scanning, determination of carbonate content and grain-size analyses (of bulk and terrigenous fraction), as well as visual inspections of the lithogenic residue; the age model is based on oxygen isotopes and radiocarbon ages. Data show that the input of aeolian dust in the periplatform ooze as indicated by Ti/Al and Fe/Al element ratios abruptly increases at 57 ka BP, stays elevated during glacial times, and reaches a Holocene minimum around 6.5 ka BP, contemporary to the African Humid Period. Subsequently, there is a gradual increase in dust flux which almost reaches glacial levels during the last centuries. Grain-size data show that the majority of dust particles fall into the fine silt range (below 10 µm); however, there is a pronounced coarse dust fraction in the size range up to 63 µm and individual ‘giant’ dust particles are up to 515 µm in size. Total dust flux and the relative amounts of fine and coarse dust are decoupled. The time-variable composition of the grain-size spectrum is interpreted to reflect different dust transport mechanisms: fine dust particles are delivered by the trade winds and the geostrophic winds of the Saharan Air Layer, whereas coarse dust particles travel with convective storm systems. This mode of transport ensures continuous re-suspension of large particles and results in a prolonged transport. In this context, grain-size data from the terrigenous fraction of carbonate drifts provide a measure for past coarse dust transport, and consequently for the frequency of convective storm systems over the dust source areas and the tropical Atlantic.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev
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  • 9
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    Anatomy and sedimentary model of a hooked spit (Sylt, southern North Sea) (2010)
    In:  EPIC3Sedimentology, 57(4), pp. 935-955, ISSN: 00370746
    Details
    Publikationsdatum: 2017-06-14
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev
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  • 10
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    The sedimentary architecture of a Holocene barrier spit (Sylt, German Bight): Swash-bar accretion and storm erosion (2008)
    In:  EPIC3Sedimentary Geology, 206(1-4), pp. 1-16, ISSN: 00370738
    Details
    Publikationsdatum: 2017-06-14
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev
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