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Articles 271 - 300 of 423
Full-Text Articles in Earth Sciences
Effects Of Stress And Water Saturation On Seismic Velocity And Attenuation In Near Surface Sediments, James Michael Crane
Effects Of Stress And Water Saturation On Seismic Velocity And Attenuation In Near Surface Sediments, James Michael Crane
LSU Doctoral Dissertations
Seismic investigation in the near-surface is complicated by highly attenuating media, large interparticle stresses, and variable water saturation, so new tools and methodology are necessary to understand the relationships between velocity, attenuation, and physical properties of the propagating media. A new shear wave source is developed for investigation of gas-charged, organic-rich sediments because compressional waves are highly attenuated and currently available sources are inadequate. The new source compares favorably to a traditional hammer impact source, producing a signal with a broader-band of frequencies (30-100Hz cf. 30-60Hz) and signal-to-noise ratios (SNR) equivalent to ~3 stacked hammer blows to the hammer impact …
Analysis Of The Cyclostratigraphy At The Devonian-Carboniferous Boundary In South-Central Oklahoma, Ryan Michael Todd Ellis
Analysis Of The Cyclostratigraphy At The Devonian-Carboniferous Boundary In South-Central Oklahoma, Ryan Michael Todd Ellis
LSU Master's Theses
An outcrop in La Serre, France, was officially ratified by the ICS in 1989, and the IUGS in 1990, as the location of the Global Boundary Stratotype Section and Point (GSSP) for the Famennian–Tournaisian, and subsequently the Devonian–Carboniferous (D–C) boundary. GSSPs, like this one, are official outcrops that provide physical representations of geologic time boundaries, essentially geological standards that define geologic time, providing a vital framework to model a variety of interpretations of geological phenomena from paleoclimate to paleontological. It has been acknowledged that the GSSP in La Serre, France is in need of revision due to fossil reworking and …
Temperature And Pressure Conditions Of Archean Amphibolite-Granulite Facies Metamorphic Xenoliths From The Eastern Beartooth Mountains, Montana And Wyoming, Usa, Celina N. Will
LSU Master's Theses
Compositionally-diverse Archean metamorphic rocks occur as xenoliths within the well-dated 2.8 Ga granitic gneisses that volumetrically-dominate the eastern Beartooth Mountains of the northern Wyoming Province. Common mafic lithologies in the Quad Creek-High Line Trails-Christmas Lake-Wyoming Creek-Line Creek Plateau area include granitic gneiss, amphibolites, mafic granulites and biotite and garnet-bearing peraluminous gneisses. The region also has sillimanite-biotite ± cordierite ± garnet gneisses and migmatites, as well as a single occurrence of a noteworthy orthopyroxene-cordierite gneiss with late-stage anthophyllite. A combination of detailed petrographic analysis and thermobarometric modeling were used to constrain the metamorphic conditions of the xenoliths prior to inclusion in …
Contractional Tectonics : The Himalayan Orogen And Perdido Fold-Thrust Belt, Dian He
Contractional Tectonics : The Himalayan Orogen And Perdido Fold-Thrust Belt, Dian He
LSU Doctoral Dissertations
This dissertation focuses on the kinematic evolution of two major categories of contractional tectonics: collisional orogenic belts and toe structures of passive margins, which are characterized by fold-thrust belts that are hundreds of kilometer-scale and tens of kilometer-scale, respectively. The Himalayan orogen is an excellent example of collisional orogenic belts along convergent plate boundaries. It is commonly structurally defined as three stacked units separated by two fault systems: the Main Central thrust (MCT) and South Tibet detachment (STD). The development and emplacement of the middle unit, the Himalayan crystalline core, has long been debated within the extrusion framework, a process …
Sources Of Salinization Of The Baton Rouge Aquifer System: Southeastern Louisiana, Callie Elizabeth Anderson
Sources Of Salinization Of The Baton Rouge Aquifer System: Southeastern Louisiana, Callie Elizabeth Anderson
LSU Master's Theses
A major environmental and economic problem confronting the Baton Rouge area, southeastern Louisiana, is the progressive salinization of the Baton Rouge aquifer system, an important source of fresh municipal and industrial groundwater. The Baton Rouge fault marks a boundary between fresh groundwaters to the north and predominately brackish waters to the south. Determining the permeability architecture of the fault is an essential component of modeling groundwater flow and saline contamination north of the fault. Understanding the sources and pathways of the saline waters that are migrating into the freshwater sands north of the fault is thus essential in helping to …
Mapping Of The Oil Window In The Eagle Ford Shale Play Of Southwest Texas Using Thermal Modeling And Log Overlay Analysis, Austin Pourciau Cardneaux
Mapping Of The Oil Window In The Eagle Ford Shale Play Of Southwest Texas Using Thermal Modeling And Log Overlay Analysis, Austin Pourciau Cardneaux
LSU Master's Theses
The Eagle Ford formation in South Texas has been an established hydrocarbon play since 2008. The Eagle Ford is considered an unconventional resource because it is a source, reservoir, and seal. Hydraulic fracturing and horizontal drilling have enabled this play. As drilling and production continue the limits of this play are being defined. The area between dry gas and wet gas/condensate has been known for some time since the initial production started in dry gas and moved up-dip. After the oil window was discovered, the contact between wet gas/condensate started to become more defined. Now companies are beginning to delineate …
Depositional Environments Of Upper Meiocene Through Pleistocene Siliciclastic Sediments, Baton Rouge Aquifer System, Southeastern Louisiana, Elizabeth Laurel Chamberlain
Depositional Environments Of Upper Meiocene Through Pleistocene Siliciclastic Sediments, Baton Rouge Aquifer System, Southeastern Louisiana, Elizabeth Laurel Chamberlain
LSU Master's Theses
Saltwater encroachment northward into freshwater sands of the Baton Rouge aquifer system, southeast Louisiana, poses a serious environmental threat to the metropolitan water source. The aquifer consists of a 0.6 mile-thick succession of interbedded, unconsolidated south-dipping siliciclastic sandy units and confining mudstones dating from the Upper Miocene through the Pleistocene. The study area is crosscut by the Baton Rouge fault, a west-east trending listric fault that serves as a leaky barrier to saltwater intrusion from the south. A better understanding of the connectivity, morphology and depositional setting of this aquifer system and hydraulic properties of the Baton Rouge fault is …
Thermal And Pore Pressure History Of The Haynesville Shale In North Louisiana: A Numerical Study Of Hydrocarbon Generation, Overpressure, And Natural Hydraulic Fractures, William C. Torsch
Thermal And Pore Pressure History Of The Haynesville Shale In North Louisiana: A Numerical Study Of Hydrocarbon Generation, Overpressure, And Natural Hydraulic Fractures, William C. Torsch
LSU Master's Theses
New drilling technology has led to a revival of drilling in mature petroleum basins such as the Haynesville Formation in east Texas and north Louisiana. In north Louisiana, the Upper Jurassic (Kimmeridgian) aged Haynesville shale has a basinward SW dip and is located at depths ranging from around 10,500 ft to the northeast and 14,000 ft to the southwest with local minimums at the Sabine and Monroe Uplifts. Formation thickness ranges from 100 to 400 feet. Prolific natural gas production is attributed to relatively high average porosity (8 to 14%) and a high geopressure gradient > 0.9 psi/ft. (Wang and Hammes, …
Magnetostratigraphy Susceptibility Correlations For The Guadalupian-Lopingian Boundary And The Placement Of The North American Ochoan Series: Texas (Usa) And South China, Matthew Allan Clark
Magnetostratigraphy Susceptibility Correlations For The Guadalupian-Lopingian Boundary And The Placement Of The North American Ochoan Series: Texas (Usa) And South China, Matthew Allan Clark
LSU Master's Theses
Stratigraphic studies have emphasized the use of multiple, geochemical and geochemical proxies to investigate critical geologic boundaries, events and their correlation throughout the entire Phanerozoic. In this study, an emerging geophysical proxy, mass-specific, low-field magnetic susceptibility (χ) is used to investigate the global correlation of the Guadalupian-Lopingian (G-L) boundary, to better resolve and supplement biostratigraphic correlations, including inferred G-L boundary sections defining the base of the North American Ochoan Series. The North American Ochoan Series of West Texas, defined lithostratigraphically by the contact between the Bell Canyon and Castile Formations, represents a unique and well-studied sequence in the Delaware Basin, …
The Distribution And Diversity Of Functional Gene Pathways Controlling Sulfur Speciation In Lower Kane Cave, Wyoming, Audrey Tarlton Paterson
The Distribution And Diversity Of Functional Gene Pathways Controlling Sulfur Speciation In Lower Kane Cave, Wyoming, Audrey Tarlton Paterson
LSU Master's Theses
Defining the linkages between microbial metabolic activity and environmental geochemistry can be used to understand how carbonate dissolution in sulfidic karst systems proceeds. In Lower Kane Cave, Wyoming, sulfidic springs support taxonomically distinct microbial communities that are also associated with putative sulfur metabolisms (e.g., oxidation of reduced sulfur compounds, sulfate reduction, and sulfur disproportionation) that influence carbonate dissolution. The distribution of diverse microbial groups in other terrestrial subsurface environments is not well understood, making Lower Kane Cave ideal for study. Molecular genetics techniques were used to uncover diversity of 16S rRNA genes and bacterial soxB and aprA functional genes. Aqueous …
Spatial Variation Analysis Of Salinity To Determine Fluid Flow Pathways And Reservoir Compartmentalization In A Deepwater Gulf Of Mexico Field, William Jacob Daugherty
Spatial Variation Analysis Of Salinity To Determine Fluid Flow Pathways And Reservoir Compartmentalization In A Deepwater Gulf Of Mexico Field, William Jacob Daugherty
LSU Master's Theses
Variations in salinity have been documented in previous studies onshore Louisiana in the Wilcox group (Funayama and Hanor 1995) as well as offshore Louisiana on the continental shelf (Bruno and Hanor 2003 and Steen et al. 2011). These studies were conducted using various methods to estimate pore water salinity and make inferences about possible fluid flow pathways and compartmentalization of reservoirs in order to better understand the complex hydrogeology of the Gulf of Mexico. Similar variations in salinity were documented in this study located in a deepwater salt withdrawal minibasin located on the upper slope of the Gulf of Mexico. …
A High-Resolution Palynological Analysis Of The St. Stephens Quarry, Alabama: Locating The Eocene-Oligocene Boundary And Characterizing The Environmental Changes Across The Margin, Kevin Jensen
LSU Master's Theses
The Eocene-Oligocene (E-O) transition is a key interval in geological history because it marks a major change in Earth’s climate and because these strata are also popular oil targets in the Gulf Coast. E-O sequences in Alabama are stratigraphically complex. The St. Stephens Quarry (SSQ) in Alabama is one of the few accessible quarries along the Gulf Coast where the E-O boundary is visible in outcrop. Despite the abundance of research projects conducted in the SSQ, many controversies still surround the E-O boundary placement and correlation to the Global Stratotype in the Massignano section in Italy that is based on …
U-Pb Geochronology Of Detrital Zircon In Quartzites Of The Sawtooth Metamorphic Complex, Sawtooth Range, Idaho, Usa, Philip Gerard Bergeron
U-Pb Geochronology Of Detrital Zircon In Quartzites Of The Sawtooth Metamorphic Complex, Sawtooth Range, Idaho, Usa, Philip Gerard Bergeron
LSU Master's Theses
In southwest Laurentia, the Paleoproterozoic Selway terrane has been proposed to extend as basement from the Wyoming Province to the Proterozoic rifted margin of Laurentia primarily based on limited exposures. The Sawtooth Metamorphic Complex (SMC), Idaho, a series of high-grade metasupracrustal rocks lies within the proposed region of the Selway terrane and may represent remnants of this terrane. Alternatively, it may represent another basement terrane of cratonic North America. To test the hypothesis that the SMC belongs to the Selway terrane, detrital zircon U/Pb ages of five quartzite samples were analyzed by LA-ICP-MS to establish age, possible provenance, and age …
Evaluation Of Pleistocene To Holocene (Mis 5 To 1) Climatic Changes In Southwestern Black Sea: A Palynological Study Of Dsdp Site 380, Shannon Ferguson
Evaluation Of Pleistocene To Holocene (Mis 5 To 1) Climatic Changes In Southwestern Black Sea: A Palynological Study Of Dsdp Site 380, Shannon Ferguson
LSU Master's Theses
Site 380 of the Deep Sea Drilling Program [DSDP] is located in the southwestern region of the Black Sea (42°05.94’, 29°36.82’E). The location of this site is important due to its proximity to the narrow Bosphorus strait, the only present-day connection between the Black Sea and the Aegean Sea. Drops in eustatic sea level during extensive Pleistocene glacial episodes disconnected the Black Sea from the Aegean Sea at the Bosphorus strait, creating a change from brackish to freshwater within the Black Sea during these intervals. Organic-walled phytoplankton (dinoflagellate cysts, acritarchs, and fresh-water algae) are investigated to better constrain these glacio-eustatic …
Variations In Pore Water Salinities Above And Below Allochthonous Salt Sheets In The Deepwater Gulf Of Mexico: Implications For Mechanisms Of Solute Transport, Miles Alexander Mccammon
Variations In Pore Water Salinities Above And Below Allochthonous Salt Sheets In The Deepwater Gulf Of Mexico: Implications For Mechanisms Of Solute Transport, Miles Alexander Mccammon
LSU Master's Theses
Spatial variations in salinity of pore waters in marine sediments provide useful information on processes and rates of subseafloor fluid flow and solute transport, particularly if there are evaporites in the section. Pore water salinities were determined for 18 drill holes which penetrated allochthonous salt bodies in 12 widely-scattered protraction blocks on the Louisiana offshore continental shelf and slope. Salinities were calculated from Log ASCII Standard-Logging While Drilling (LAS-LWD) logs using the Revil et al. (1998) dual-conductivity technique. The sites represent a wide range of field settings. Water depths range from 30 to 1990 m, depths to the top of …
A Seismic Attribute Study To Assess Well Productivity In The Ninilchik Field, Cook Inlet Basin, Alaska, Andrew Sampson
A Seismic Attribute Study To Assess Well Productivity In The Ninilchik Field, Cook Inlet Basin, Alaska, Andrew Sampson
LSU Master's Theses
Coal bed methane which has formed in the Tertiary Kenai Group strata has been produced from the Ninilchik field of Cook Inlet, Alaska since 2001. Ninilchik field is located on the eastern margin of the central Cook Inlet along the Kenai Peninsula. Cook Inlet is a forearc basin and is characterized by northeast trending anticlines with upwards of 10,000 feet of Late Oligocene and younger, non-marine sediments. Highly variable well production within the Oligocene to Miocene Tyonek formation of the Kenai Group has been a source of uncertainty. A series of seismic attributes visualized in Schlumberger's Petrel® software were studied …
Implications Of Geothermal History On Microbial Gas Generation And Coalbed Methane Production In The Ninilchik Field, Cook Inlet Basin, Alaska, Eric M. Hart
LSU Master's Theses
Coalbed methane (CBM) production operations atop the Ninilchik anticline of Cook Inlet, Alaska pose intriguing questions regarding the nature of biogenic gas generation in a thermally complex forearc basin setting. This thermal complexity stems, in part, from its up to 30,000 ft thick Tertiary section, comprised of braided stream alluvium and expansive, interbedded coal deposits. Rapid accumulation of cold, glacial strata is documented as being capable of regionally suppressing the elevated heat flux values expected within a forearc basin. In addition, beds with high organic content, such as the coal layers, act as natural insulators from basinal heat flux and …
Palynostratigraphy Of The Umir Formation, Middle Magdalena Valley Basin (Mmvb) Colombia, Carlos Enrique Santos
Palynostratigraphy Of The Umir Formation, Middle Magdalena Valley Basin (Mmvb) Colombia, Carlos Enrique Santos
LSU Master's Theses
The Late Cretaceous Umir Formation in Middle Magdalena Valley Basin (MMVB) was recently acknowledged as a new target. However, there is little known about the regional distribution of the Umir Formation since it is affected by structural complexity and a major regional unconformity. To improve biosteering of the Umir Formation and reduce exploratory risks, a detailed biostratigraphic analysis of the Umir Formation in the MMVB is presented. Eighty samples from four cores drilled in the Central Eastern MMVB were analyzed for palynological content. These cores represent 976.6 meters of the Middle to Upper Umir Formation. The sediment yielded a good …
Evaluation Of The Depositional Environment Of The Eagle Ford Formation Using Well Log, Seismic, And Core Data In The Hawkville Trough, Lasalle And Mcmullen Counties, South Texas, Zachary Paul Hendershott
Evaluation Of The Depositional Environment Of The Eagle Ford Formation Using Well Log, Seismic, And Core Data In The Hawkville Trough, Lasalle And Mcmullen Counties, South Texas, Zachary Paul Hendershott
LSU Master's Theses
The Upper Cretaceous Eagle Ford Formation of South Texas records a mixed siliciclastic/carbonate depositional environment across the Late Cretaceous Platform of the Gulf of Mexico. During the Late Cretaceous, LaSalle and McMullen Counties was part of the Hawkville Trough, a wedged shaped region between the Edwards and Sligo carbonate reefs. Well logs from 21 wells and seismic data were used to construct structure and isopach maps of the Eagle Ford Formation throughout the Hawkville Trough. Only the unconformable bottom (Buda-Eagle Ford) and top (Eagle Ford-Austin Chalk) boundaries plus the conformable boundary between the upper and lower Eagle Ford can be …
Sediment Flux & Fate For A Large-Scale Diversion: The 2011 Mississippi River Flood, The Bonnet Carré Spillway, And The Implications For Coastal Restoration In South Louisiana, Jeffrey Bryant Fabre
Sediment Flux & Fate For A Large-Scale Diversion: The 2011 Mississippi River Flood, The Bonnet Carré Spillway, And The Implications For Coastal Restoration In South Louisiana, Jeffrey Bryant Fabre
LSU Master's Theses
Dams and hardened levees built by European settlers in the last two centuries have degraded or stopped the cyclic sedimentation patterns that built the Mississippi River Delta Plain over the past 7,000-8,000 years. Man-made diversions of sediment-laden river water along the lower Mississippi, operated during high water periods, are being considered as a primary mechanism for combating the land loss induced by rising sea-level and these modern controls. To date, no study has documented the sediment-delivery potential of a large man-made river diversion during a single high water event. In the spring of 2011, historic flooding on the Mississippi River …
Longitudinal Assessment Of Shifting Microbial Community Composition In Sandy Beaches Following The 2010 Deepwater Horizon Oil Spill And Remediation Efforts, Axita Ajaykumar Gupta
Longitudinal Assessment Of Shifting Microbial Community Composition In Sandy Beaches Following The 2010 Deepwater Horizon Oil Spill And Remediation Efforts, Axita Ajaykumar Gupta
LSU Master's Theses
Sandy beaches are geological zones parallel to the shoreline where high energy, open ocean unconsolidated sediments are deposited and reworked. Sandy beaches represent critical ecosystems that support a wide variety of underappreciated biodiversity. Prior to the 2010 Deepwater Horizon oil spill in the Gulf of Mexico, the diversity and function of microbial communities in supratidal beach sediments along the Gulf of Mexico coastlines were not well understood. It was unclear if possible community compositional changes would occur during and following exposure to oil, or what impact the remediation efforts, such as sand washing, would have to the microbial communities and …
A 2-D, Variable-Density Numerical Model Of Subsurface Fluid Flow Through The Edwards Aquifer, New Braunfels, Tx: Mechanisms Inhibiting Flow Across The Freshwater/Saline-Water Interface, Scott Ryan Tipple
LSU Master's Theses
The Edwards aquifer in south-central Texas, U.S., composed of faulted carbonate bedrock, contains freshwater and saline water. In aquifers that are used as a source of drinking water and that contain fresh and saline waters, saline-water intrusion can result in degradation of water quality. Yet, in the Edwards aquifer, limited saline-water intrusion has occurred. The questions addressed are “Why is the saline-water intrusion less than expected,” and “Is there a trigger that will result in saline-water intrusion into the freshwater reservoir?” Three hypotheses were tested. One: an extremely saline water density might prevent mixing across the interface. Two: faults could …
Evaluating The Duration Of Post-Lgm Grounding Events In The Glomar Challenger Basin Paleotrough, Eastern Basin Antarctica, Using Sediment Flux Calculations, Boluwatife Owolana
Evaluating The Duration Of Post-Lgm Grounding Events In The Glomar Challenger Basin Paleotrough, Eastern Basin Antarctica, Using Sediment Flux Calculations, Boluwatife Owolana
LSU Master's Theses
Previously acquired geological and geophysical data from the eastern Ross Sea outer shelf support the view that the West Antarctic Ice Sheet (WAIS) deposited three large-volume grounding zone wedges (GZWs) during the relatively short time since the onset of ice sheet retreat began at approximately 11 ka 14C BP. Here, GZW sediment volumes were estimated from seismic data correlations to evaluate the different possible durations of the individual grounding events. The two end-member fluxes used correspond to 1) a modern flux active at Whillans Ice Stream and 2) a larger flux accounting for the larger size of the drainage basin …
West Antarctic Ice Sheet Retreat Chronology Of Two Middle-Shelf Grounding-Zone Wedges In Eastern Basin, Ross Sea, Antarctica, Lenora Nicole Copeland
West Antarctic Ice Sheet Retreat Chronology Of Two Middle-Shelf Grounding-Zone Wedges In Eastern Basin, Ross Sea, Antarctica, Lenora Nicole Copeland
LSU Master's Theses
This study isolated a small number of large, in situ and reworked foraminifera from diamicts deposited in two grounding zone wedges on the middle continental shelf in Eastern Basin, Ross Sea, Antarctica. All samples were of sufficient weight to yield Holocene dates if the samples were indeed of Holocene age. Of the twelve small samples sent for radiocarbon analysis, the two heaviest were for reworked foraminifera which yielded dates of >22,200 14C BP and >22,500 14C BP. None of the other ten samples yielded radiocarbon dates. The lack of Holocene radiocarbon dates for the six in situ and four reworked …
Antarctic Plant And Phytoplankton Response To The First Phase Of The Mid Miocene Climatic Optimum At South Mcmurdo Sound, Lee Foersterling
Antarctic Plant And Phytoplankton Response To The First Phase Of The Mid Miocene Climatic Optimum At South Mcmurdo Sound, Lee Foersterling
LSU Master's Theses
The Antarctic Drilling Program (ANDRILL) recovered 1138.54 m of sub-seafloor marine sediments with 98% core recovery at the AND2-2A drill site in South McMurdo Sound. Biostratigraphy, magnetostratigraphy, and isotopic dating (Acton et al., 2008) indicated that an Early to Middle Miocene section (223-1138.54 mbsf) was recovered. This study focuses on an interval with high concentrations of palynomorphs, located between 460.57 and 403.48 mbsf and dated to 16.7 Ma to 16.2 Ma according to the updated Acton et al. (2008) ANDRILL SMS age model. Palynological results show a pronounced increase in organic microfossils between 434.01 and 431.91 mbsf, compared to levels …
Geothermal And Geopressure Assessment With Implications For Carbon Dioxide Sequestration, A Regional Scale Study, Lower Tuscaloosa Formation, Louisiana, Timmon Drumm
LSU Master's Theses
The Massive Sand member of the lower Tuscaloosa formation in Louisiana has the potential to be a prolific reservoir for carbon dioxide sequestration. Proximity to near-term anthropogenic carbon dioxide sources and existing infrastructure in the area make Louisiana a viable prospect for carbon capture and storage projects. The geothermal and geopressure conditions of the reservoir indicate that high carbon dioxide densities can be maintained throughout the study area, and substantial sand thicknesses were located. Subsurface depths of the top of the Massive Sand member range from roughly -2500 ft (-762 m) to over -21,000 ft (-6400 m) with a regional …
Laboratory Scale Seismic Analysis Of A Spatially Variable Hydrological Surface In Unconfined, Unconsolidated Sand, David E. Smolkin
Laboratory Scale Seismic Analysis Of A Spatially Variable Hydrological Surface In Unconfined, Unconsolidated Sand, David E. Smolkin
LSU Master's Theses
The ability to measure the depth to the water table can provide information such as reservoir characteristics, soil conditions for agriculture, and actions to be taken with contaminant flow and removal. We attempt to detect this boundary in a larger-than-lab scale experiment. We attempt to simulate a spatially variable water level and attempt to image changes in the depth of this water level. We try to reduce the normally complex natural conditions to those of a nominally homogeneous and isotropic, unconfined sand volume for modeling. These simplified conditions help isolate the effects of remaining complexities such as the variable saturation …
Provenance And Origin Of Holocene Beach Ridge And Modern Beach Sands From The Costa De Nayarit, Western Mexico, Ruben Abe Cisneros
Provenance And Origin Of Holocene Beach Ridge And Modern Beach Sands From The Costa De Nayarit, Western Mexico, Ruben Abe Cisneros
LSU Master's Theses
The Costa de Nayarit in western Mexico is a classic modern example of the progradation of a coastline in a wave-dominated depositional environment. Throughout the Pleistocene, sediments have been brought to the Costa De Nayarit via three major river systems, the Rio Grande de Santiago, the Rio San Pedro and the Rio Acaponeta. These river systems obtain their sediments from two distinctly different volcanic provinces within central Mexico, the Sierra Madre Occidental (SMO), a volcanic province characterized by its predominance of felsic volcanism (rhyolites) and pyroclastic flows (welded ash flow tuff and ignimbrite), and the Trans-Mexican Volcanic Belt (TMVB), which …
A Palynological And Sequence Stratigraphic Study Of Santonian - Maastrichtan Strata From The Upper Magdalena Basin, Sandra Garzon
A Palynological And Sequence Stratigraphic Study Of Santonian - Maastrichtan Strata From The Upper Magdalena Basin, Sandra Garzon
LSU Master's Theses
This manuscript presents a biostratigraphic and sequence stratigraphic interpretation of palynological data from two outcrop sections on the NE flank of the Upper Magdalena Valley (UMV) basin comprising the Santonian to Lower Maastrichtian interval. The objectives of this study where: a) to characterize the lithologically similar Lower Lidita, Upper Lidita, and El Cobre, Buscavidas formations and b) to provide a better understanding of important correlation horizons in the northeastern part of the UMV basin and to confirm the age assignment of stratal units. A cyclic pattern of palynomorph distribution was recognized in both sections and tied to the different stages …
Soft Sediment Relay Zones: A High Resolution Seismic Survey Livingston Parish, Louisiana, Erin T. Elliott
Soft Sediment Relay Zones: A High Resolution Seismic Survey Livingston Parish, Louisiana, Erin T. Elliott
LSU Master's Theses
The southern coast of the United States, bordering the Gulf of Mexico, is home to several down-to-the-south, listric, normal fault systems striking parallel to the coast. One of these, the Baton Rouge–Tepetate Fault System located in southern Louisiana, consists of a series of near-surface, reactivated growth faults and relay ramps– a broad area of ductile strain, with contemporaneous sedimentation. Evidence of recent fault and relay ramp movement is seen in surficial fault line scarps and offset roads. This thesis utilizes two near-surface (<500 >m), high-resolution (10 - 300 Hz), continuous seismic reflection profiles (360 m and 480 m long, 3 …