Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 61 for “"Progradation"”.
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Modeling the Lafourche Delta network in the Mississippi Delta Complex
… including a channel network geometry, progradation rate, and number of bifurcation. For the appropriate basin shapes, reasonable water discharge and common sediment transport parameters, MB_DCN produced a channel network that resembles the Lafourche Delta channel network morphology and …
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Reconstructing long term sediment flux from the Brooks Range, Alaska using shelf edge clinoforms
… the transport conditions associated with progradation of the shoreline and construction of the continental margin out of detritus shed from the ancestral Brooks Range. Using STRATA, a synthetic stratigraphic modeling package, constructional clinoform geometries similar to those preserved …
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Reconstructing long term sediment flux from the Brooks Range, Alaska, using edge clinoforms
… the transport conditions associated with progradation of the shoreline and construction of the continental margin out of detritus shed from the ancestral Brooks Range. Using STRATA, a synthetic stratigraphic modeling package, constructional clinoform geometries similar to those preserved …
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Late Quaternary variability in coastal changes along the Texas Gulf coast
… retreating landwards, only a few are stable or progradational. The barriers are responding to both external (allogenic) forcings such as relative sea-level and sediment supply, and internal (autogenic) basinal mechanisms such as antecedent topography, regional subsidence, wave climate, offshore …
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Fluvial influence on high-frequency sedimentary cycle geometry: The transition from strandplain to deltaic deposition in the Cretaceous Point Lookout Sandstone, San Juan Basin, Colorado
… represents late highstand systems tract progradation and subsequent shelf-margin systems tract deltaic deposition. Posamentier and Vail's (1988) model of deposition during base-level fail in the absence of fluvial incision predicts many of the stratigraphic relationships observed in the …
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Kinematics and dynamics of salt tectonics in the Paradox Basin, Utah and Colorado : field observations and scaled modeling
… initiation of salt tectonics driven by progradation and by thick-skinned extension and to investigate modification of pre-existing diapirs by subsequent regional extension and shortening, salt withdrawal and dissolution. Combined field mapping and physical modeling were used to …
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Characteristics and evolution of a dynamic prograding continental margin: the late Neogene Giant Foresets Formation, northern Taranaki Basin, New Zealand
… Giant Foresets Formation represents the progradation and development of the modem continental margin in northern Taranaki Basin. The dynamic evolution of this formation is fundamentally linked to a Pliocene-Pleistocene increase in sediment flux sourced from South Island, to extensional …
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Differential Sedimentation In A Mississippi River Crevasse Splay
… the mouth bar show that the bar conforms to the progradational stage of an existing conceptual model of mouth bar development. This is confirmed by cores dated using Beryllium-7, which provides a record of the deposition on the bar over a 90-day period. Stratigraphic data from cores obtained on …
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Paleoecology of Upper Harkless archaeocythan reefs in Esmeralda County, Nevada
… prograded across the carbonate platform. This progradation is theorized to be a result of (1) climate change, (2) a prolonged standstill, or (3) sea level lowering.
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Framework and Evolution of a Transgressed Delta Lobe: The St. Bernard Shoals, Gulf of Mexico
… by a ravinement surface and lie directly upon progradational facies associated with previously unrecognized southern progradation of the La Loutre distributary network.
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A stratigraphical, sedimentologial and palaeoenvironmental analysis of holocene and present-day coastal sedimentation: Wigtown Bay, S.W. Scotland
… B.P. local regression had begun and seaward progradation of high upper tidal-flats and marsh had started. This environmental situation prevailed until 5,000 years B.P., when incision occurred and terrestrial conditions became dominant.In the lower Cree estuary, waters of the Holocene marine …
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Stratigraphy and Depositional History of the Deadwood Formation (Upper Cambrian and Lower Ordovician), Williston Basin, North Dakota
… C through F consist of three asymmetrical, progradational successions deposited during three Early Ordovician transgressiveregressive events. In ascending order, each succession consists of: 1) a mixed sandstone-limestone lithotype; 2) limestone lithotypes ranging from mudstone to …
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Depositional system and source rock potential of the Sharon Springs Formation in Colorado
… following the Niobrara Highstand, and an overall progradation of siliciclastics into the Western Interior Seaway. These units gradually decrease over time in calcite content associated with chalk filled fecal pellets, to clay and quartz dominated deposits with a large constituent of pyrite. This …
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Holocene Geomorphology of the Macdonald and Tuross Rivers
… When sea level stabilised 6500 years ago, progradation of the Tuross River was initiated, but continued to occur in the Macdonald valley. The aggradation that formed the highest and most extensive alluvial surfaces along the two valleys occurred between 6000 and 2000 years ago. The …
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Holocene Geomorphology of the Macdonald and Tuross Rivers
… When sea level stabilised 6500 years ago, progradation of the Tuross River was initiated, but continued to occur in the Macdonald valley. The aggradation that formed the highest and most extensive alluvial surfaces along the two valleys occurred between 6000 and 2000 years ago. The …
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Regional dolomitization of Early Ordovician, Upper Knox Group, Appalachians
… occurred penecontemporaneously with tidal flat progradation during fifth-order (up to 100 k.y.) sea-level falls as indicated by: abundant dolomite in cycles with well-developed tidal flat caps and scarce dolomite in cycles with no or thin laminite caps; decrease in dolomite abundance with …
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Structural and Stratigraphic Reconstruction of the Whiting Dome Salt Structure in Viosca Knoll-Mississippi Canyon, GOM, Using 3D Seismic Data
… and migration issues of hydrocarbons.</p> <p> Progradation of delta front and shelf to slope transitional sediments has expulsed and emplaced an allochthonous salt structure (Whiting Dome) in the Viosca Knoll and Mississippi Canyon protraction areas of the Gulf of Mexico. Multiple salt …
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Stratigraphy of the clastic Silurian rocks of central western Virginia and adjacent West Virginia
… complex (called the Giles delta) with the progradation of the delta beginning at about the time of the C₅-C₆ time boundary. The upper Tuscarora Sandstone is interpreted to be a coastal fluvial system deposit reworked by shoreline processes into a beach deposit. The lowermost Rose Hill …
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Holocene Formation and Evolution of Horn Island, Mississippi, USA
… barrier complex and lower shoreface indicate progradation and island formation, in addition to lateral migration in a westward direction that continues to present day. Past sensitivity to rates of sea-level rise coupled with an exhausted sediment supply make the future of Horn Island …
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Evolution of early Proterozoic passive-margin carbonate platform, Rocknest Formation, Wopmay Orogen, N.W.T., Canada
… expansion of the shoal—complex, and slow progradation of tidal flats over lagoonal facies during sea-level fall. Computer modelling of Rocknest cycle types across the platform provides important information on absolute l sedimentation rates and lag times.
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