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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Mediterranean region (1)
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Mediterranean Sea
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East Mediterranean
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Aegean Sea (1)
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Levantine Basin (1)
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Mediterranean Ridge (1)
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West Mediterranean
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Balearic Basin (1)
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Tyrrhenian Sea (1)
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commodities
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brines (1)
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geologic age
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Cenozoic
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Quaternary (1)
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Tertiary
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Neogene
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Miocene
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upper Miocene
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Messinian
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Messinian Salinity Crisis (1)
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minerals
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hydrates (1)
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Primary terms
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brines (1)
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Cenozoic
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Quaternary (1)
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Tertiary
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Neogene
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Miocene
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upper Miocene
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Messinian
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Messinian Salinity Crisis (1)
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continental slope (1)
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Deep Sea Drilling Project
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Leg 42A
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DSDP Site 371 (1)
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deformation (2)
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geophysical methods (2)
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Mediterranean region (1)
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Mediterranean Sea
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East Mediterranean
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Aegean Sea (1)
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Levantine Basin (1)
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Mediterranean Ridge (1)
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West Mediterranean
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Balearic Basin (1)
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Tyrrhenian Sea (1)
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mud volcanoes (1)
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Ocean Drilling Program
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Leg 160 (1)
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Leg 161 (1)
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ocean floors (2)
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plate tectonics (1)
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sea-level changes (1)
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sedimentary rocks
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chemically precipitated rocks
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evaporites (2)
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sedimentation (1)
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slope stability (1)
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stratigraphy (1)
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tectonics
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salt tectonics (3)
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sedimentary rocks
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sedimentary rocks
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chemically precipitated rocks
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evaporites (2)
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Subsurface heat and salts cause exceptionally limited methane hydrate stability in the Mediterranean Basin
Open-slope, translational submarine landslide in a tectonically active volcanic continental margin (Licosa submarine landslide, southern Tyrrhenian Sea)
Abstract The southern Tyrrhenian continental margin is the product of Pliocene–Recent back-arc extension. An area of approximately 30 km 2 of gentle (about 1.5°) lower slope of the last glacial outer shelf sedimentary wedge in water depths of between 200 and 300 m failed between 14 and 11 ka BP. We approached the landslide by multibeam and sub-bottom profiler surveying, high-resolution multichannel seismics, and coring for stratigraphic and geotechnical purposes. With regard to a slope-stability analysis, we carried out an assessment of the stratigraphic and structural setting of the area of the Licosa landslide. This analysis revealed that the landslide detached along a marker bed that was composed of the tephra layer Y-5 ( c. 39 ka). Several previously unknown geological characteristics of the area are likely to have affected the slope stability. These are the basal erosion of the slope in the Licosa Channel, a high sedimentation rate in the sedimentary wedge, earthquake shaking, the volcanic ash nature of the detachment surface, subsurface gas/fluid migration, and lateral porewater flow from the depocentre of wedge to the base of the slope along the high-permeability ash layers. A newly discovered prominent structural discontinuity is identified as the fault whose activity may have triggered the landslide.
Seismic imaging of Late Miocene (Messinian) evaporites from Western Mediterranean back-arc basins
Storfjorden Trough-Mouth Fan, Barents Sea margin
Glacigenic debris-flow deposits, Storfjorden Fan
Abstract We have obtained improved images of a debris flow deposit through the reprocessing of multichannel seismic reflection data between Drifts 6 and 7 of the continental rise of the Pacific margin of the Antarctic Peninsula. The reprocessing, primarily aimed at the reduction of noise, relative to amplitude preservation, deconvolution, also included accurate velocity analyses. The deposit is dated as upper Pliocene (nearly 3.0 Ma) via correlation to Sites 1095 and 1096 of the Ocean Drilling Program (ODP) Leg 178. The estimated volume is about 1800 km 3 and the inferred provenance from the continental slope implies a run out distance exceeding 250 km. The dramatic mass-wasting event that produced this deposit, unique in the sedimentary history of this margin, is related to widespread late Pliocene margin erosion. This was associated with a catastrophic continental margin collapse, following the Antarctic ice sheet expansion in response to global cooling. The seismic data analysis also allowed us to identify diffractions and amplitude anomalies interpreted as expressions of sedimentary mounds at the seafloor overlying narrow high-velocity zones that we interpret as conduits of fluid expulsion hosting either methane hydrates or authigenic carbonates. Fluid expulsion was triggered by loading of underlying sediments by the debris flow deposits and may have continued until today by input of fluids from sediment compaction following the deep diagenesis of biogenic silica.
Interaction of processes and importance of contourites: Insights from the detailed morphology of sediment Drift 7, Antarctica
Abstract: As the definition of contourites has widened to embrace a large spectrum of sediments in so-called mixed systems, the distinction between contourites and turbidites has become at times vague. The case history of sediment Drift 7 off the Antarctic Peninsula is analysed in this paper in the light of newly acquired swath bathymetry data. The co-existence of various sedimentary processes is reflected in a complex morphology: erosional gullies produced by debris flows on the upper part of the continental slope; deeply incised channels at the slope base; main trunk-type inter-drift turbidity channels separating the drifts; slide scars; undulating depositional bedforms interpreted as bottom-current sediment waves; fluid escape structures perhaps associated with deep-water coral bioherms. The data suggest that Drift 7 is a genuine sediment drift in which bottom currents pirate the sediment of the turbidity currents. Finally, we propose that the control on location and elongation of the drift is inherited from an older margin structure. The relationships between bottom current and deposition are investigated through a comparison with the SE Greenland continental margin, an analogous counterpart in the northern hemisphere.
Modeling deformation and salt tectonics in the eastern Mediterranean Ridge accretionary wedge
Sediment drifts and deep-sea channel systems, Antarctic Peninsula Pacific Margin
Abstract Twelve sedimentary mounds are identified on the upper continental rise of the Pacific Margin of the Antarctic Peninsula. All these mounds are produced by a varying degree of interaction of along-slope bottom water flow with down-slope turbidity currents. These mounds provide a complete range of intermediates between two end members: the sediment drift and the channel levee. Surface sediments on drift 7 suggest that the mechanisms for the supply and transport of sediment include entrainment of material from turbidity currents within ambient bottom currents, and pelagic settling from the sea surface, including biogenic and glacially derived material. The long-lasting activity of these mechanisms is documented by the data provided by four DSDP and ODP drill sites. Bathymetric and seismic data, both at a large, comprehensive scale and at a small, detailed scale, show the geometry of the sedimentary mounds and their relationships with the adjacent turbidity current channel systems. These data allow the determination of some diagnostic criteria to identify the sediment drifts.