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 40 for “"turbidite"”.
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SEDIMENTARY ARCHITECTURE AND INTERNAL HETEROGENEITY OF TURBIDITE CHANNEL-LEVEE DEPOSITS: THE TACHRIFT TURBIDITE SYSTEM (LATE TORTONIAN, TAZA-GUERCIF BASIN, NE MOROCCO)
Turbidite channel-levee deposits have been studied for over fifty years, both in modern and ancient deep-water systems. Recent advances in 3D seismic imaging have improved our understanding of these systems, yet the internal facies complexity remains elusive. Studying well-exposed outcrops is …
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3D Seismic Interpretation of Turbidite-Sands from the Gulf of Mexico
This thesis interprets and maps some key stratigraphic and structural elements of Garden Bank (GB) Block 191 applying both geological and geophysical techniques. The area is located in the Gulf of Mexico 160 miles southwest of Lafayette. Threedimensional seismic data and some well logs were …
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The Skiddaw Group of Cumbria : early Ordovician Turbidite sedimentation and provenance on an evolving microcontinental margin.
… (Tremadoc to Llanvirn) of Cumbria. comprises turbidites. debrites and a major olistostrome. Sediment was sourced from an orogenic terrain with noncoeval continental volcanic arcs, unroofed plutons, metamorphic basement and sedimentary cover. An additional source of quartzose sediment (e.g. a …
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Improved petrophysical evaluation of consolidated calcareous turbidite sequences with multi-component induction, NMR, resistivity images, and core measurements
… selected from multiple wells penetrating a deep turbidite system. Permeability values obtained with the new interpretation method improved the correlation with core measurements by 16% as compared to permeability calculations performed with conventional methods. In addition, on average the method …
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Paleocene Turbidite Deposition in the Central American Seaway (NW Costa Rica): Geochemical Analysis and Provenance of Detrital Spinel and Clinopyroxene
… of the Paleocene deep water Rivas and Descartes turbidites that crop out on the northern part of the Santa Elena peninsula in northwestern Costa Rica. Understanding the sedimentary fill of the Sandino Basin that contributed to the closing of the seaway may lead to a better understanding of the …
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Quantifying channelized submarine depositional systems from bed to basin scale
… seismic data and outcrop exposures to study turbidites at scales ranging from bed to basin. At the basin scale, I develop a method to estimate the time-frame over which sedimentation and subsidence come into equilibrium. Using seismic data from the Fisk Basin, Gulf of Mexico, I find that, …
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Lacustrine Turbidites from Tropical African Lakes as Indicators of Hydrologic and Climatic Changes
<p>Flood-sourced turbidites (i.e. hyperpycnites) preserved in lake basins are proven indicators of hydrologic changes, yet their usefulness as recorders of tropical paleoclimate variability has long been overlooked. The primary focus of this dissertation research is to investigate the late …
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Quantifying channelized submarine depositional systems from bed to basin scale
… seismic data and outcrop exposures to study turbidites at scales ranging from bed to basin. At the basin scale, I develop a method to estimate the time-frame over which sedimentation and subsidence come into equilibrium. Using seismic data from the Fisk Basin, Gulf of Mexico, I find that, …
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Geology and Petroleum Potential of the Hay Creek Anticline, North-Central Oregon
… Formation" is interpreted to be a submarine turbidite fan. Siltstones were deposited as pelagic rain and turbidite fall out. Sandstones were deposited in turbidite flows as evidenced by flute casts. The Hay Creek Anticline formed as a result of multiple compressional forces, with periods of …
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Turbidity current processes and deposits on the northwest African Margin
… slope apron models.<br/><br/>The Moroccan Turbidite System (MTS) is the largest turbidite system on the margin, with a total length of 1500 km. Individual turbidites can be correlated across three interconnected deep-water basins, giving an unprecedented insight into the turbidite …
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Analysis of Two Neighboring Miocene Paleo-Turbidite Systems in a Complex Deep-Water Environment: Implications for Biostratigraphic Techniques Used in Gulf of Mexico Petroleum Exploration Studies
Biostratigraphic techniques are commonly used in shallow environments of the Gulf of Mexico basin for depositional history modeling in petroleum exploration applications. Extending these interpretations to deep-water settings, where the structural and depositional history is more complex, is …
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Analytical and statistical approaches toward understanding sedimentation in siliciclastic depositional systems
Recent studies of turbidite bed thickness distributions have demonstrated power law and other statistical distributions. Chapter 2 explores the different distributions which may express fan processes and may be used as a tool to classify environments. Chapter 3 illustrates a correlation between …
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High-latitude sedimentation in response to climate variability during the Cenozoic
… circulation. In Chapter 1, we propose that turbidite currents, arising from the formation of dense shelf water (DSW) in the Ross Sea (a precursor to AABW), leave a distinct record in the levees of Hillary Canyon. This canyon acts as a conduit, channeling DSW into the deep ocean and …
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Stratigraphic evolution and architectural analysis of structurally confined submarine fans: a tripartite outcrop-based study
Structurally confined and ponded turbidite systems can serve as prolific hydrocarbon reservoirs, as well as important records of relative sea-level fluctuations, sediment transfer from non-marine environments to the deep sea, and tectonic episodes. Outcrop studies of these depositional systems …
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A reconnaissance study of the metamorphic petrology and volcanic geochemistry of a portion of the Island Lake greenstone belt, Manitoba /
… with and overlain by thick sequences of turbidite facies rock; 2) the upper unit which consists of thick stratified conglomerate overlain by thickly bedded arkose and feldspathic greywacke. Reconnaissance sampling traverses were completed across both the strike of the belt and along its …
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Experiments on transitional regime sediment density flows and resulting deposits
… deceleration. Argillaceous sandstones and linked turbidite-debrites are types of submarine sediment deposits in a category known as hybrid event beds, and are interpreted to be emplaced by transitional regime flows (Talling, 2007; Davis, 2009; Haughton, 2009; Hodgson, 2009; Baas, 2011; Lee, 2013; …
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Late Pleistocene-Holocene sedimentary processes at the active margin of South-Central Chile : marine and lacustrine sediment records as archives of tectonics and climate variability
… results indicate glacial-interglacial changes in turbidite frequencies during the last 140 kyr, with short recurrence times (~200 years) during glacial and long recurrence times (~1000 years) during interglacial periods. Hence, the generation of turbidites appears to be strongly influenced by …
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The age, stratigraphy, and tectonic provenance of clastic deposits in the western Bikou terrane, southwestern Qinling Mountains, China
… the northwestern Bikou terrane consists of a turbidite dominated sedimentary basin known as the Hengdan Group; The Hengdan basin comprises a 10 to 15 km thick succession of coarsening upward, volcaniclastic sand-rich submarine fan deposits. (Abstract shortened by UMI.).
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Diatom-based reconstructions of earthquake-induced paleoenvironmental change in coastal Alaska and Washington, USA
… Prince William Sound, Alaska, and 2) lacustrine turbidite source mechanisms in Ozette Lake, Washington to potentially improve the spatial and temporal earthquake record for the northern Cascadia subduction zone. This work has implications for improving our earthquake chronologies along subduction …
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A study of anisotropy of magnetic susceptibility’s effectiveness in understanding palaeoflow systematics in shale basins
… Three distinct shale basins were selected, the turbidite Ainsa Basin, the shelfedge of the Welsh Borderlands and the hemiplegic Marcellus Shales within the Appalachian Basin. These were chosen to assess the strengths and limitation of AMS as a palaeoflow indicator, focusing mainly on the Ainsa …
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