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Articles 27361 - 27390 of 29717
Full-Text Articles in Physical Sciences and Mathematics
Seasat Orbital Radar Imagery Applied To Lineament Analysis And Relationships With Hydrocarbon Production In The Wartburg Basin Area, Tennessee, S. E. A. Brite
Seasat Orbital Radar Imagery Applied To Lineament Analysis And Relationships With Hydrocarbon Production In The Wartburg Basin Area, Tennessee, S. E. A. Brite
Masters Theses
Seasat, an orbital synthetic aperature radar launched in 1978, has produced high-resolution imagery enhancing over 1186 observed linear topographic indentations or lineaments in the Wartburg Basin area of east-central Tennessee. The main objectives of this thesis are to verify these lineaments in the field, to compare them with aerial photographic lineaments in the same area, to statistically analyze lineament trends, and to compare lineaments with oil and gas trends in the Wartburg Basin area.
Lineaments from Seasat imagery were located in the field with a high degree of accuracy. Three distinct lineament systems were derived from lineament orientations, their grouping …
Research On Atmospheric Volcanic Emissions: An Overview, James P. Friend, Alan R. Bandy, Jarvis L. Moyers, William H. Zoller, Richard E. Stoiber, Arnold L. Torres, William I. Rose, M. Patrick Mccormick, David C. Woods
Research On Atmospheric Volcanic Emissions: An Overview, James P. Friend, Alan R. Bandy, Jarvis L. Moyers, William H. Zoller, Richard E. Stoiber, Arnold L. Torres, William I. Rose, M. Patrick Mccormick, David C. Woods
Department of Geological and Mining Engineering and Sciences Publications
The project "Research on Atmospheric Volcanic Emissions" is a unique effort by NASA and university scientists to investigate the detailed chemical nature of plumes from volcanic eruptions. The major goals of the project are to: 1) understand the impact major eruptions will have on atmospheric chemistry processes, 2) understand the importance of volcanic emissions in the atmospheric geochemical cycles of selected species, 3) use knowledge of the plume chemical composition to diagnose and predict magmatic processes. Project RAVE'S first mission used the NASA Lockheed Orion P-3 outfitted with equipment to measure concentrations of the gases SO2, OCS, H …
Gully, Scour Hole, And Pothole Development At The Base Of The Gering Formation (Miocene?), Southeastern Banner County, Nebraska, Robert F. Diffendal Jr.
Gully, Scour Hole, And Pothole Development At The Base Of The Gering Formation (Miocene?), Southeastern Banner County, Nebraska, Robert F. Diffendal Jr.
Robert F. Diffendal, Jr., Publications
Several sediment-filled paleovalleys belonging to the Arikaree Group of Miocene (?) age occur in southeastern Banner County, Nebraska. One gully and a main paleovalley exhibit, respectively, erosional features like those in modern gullies in the area and like those on the bedrock floors of modern straight streams carrying an appreciable sediment load. Scour holes and a pothole on the valley floor of the main paleovalley are similar to those produced experimentally on the bed of a straight stream.
Nitrate Levels In The Groundwater Of Kalamazoo County, Michigan, William Robert Norman
Nitrate Levels In The Groundwater Of Kalamazoo County, Michigan, William Robert Norman
Masters Theses
Nitrate levels from 1,978 wells were compiled and analyzed to identify areas having levels above the Federal and State Drinking Water Standards of 10 ppm, identify possible sources of nitrate in each area and determine factors that produce high concentrations of nitrate in groundwater.
Eighteen areas in which nitrate concentrations exceeded 10 ppm were identified. County-wide, 465 (23 percent) of the wells for which data were available produced water with nitrate concentrations above drinking water standards.
Septic tank effluent is thought to be the most common source of nitrate in the problem areas. Agricultural practices are also likely nitrate contrbutors; …
Stratigraphy And Depositional Environments Of A Late Pleistocene Barrier Island Complex, Southeastern Virginia, Alan K. Jasper
Stratigraphy And Depositional Environments Of A Late Pleistocene Barrier Island Complex, Southeastern Virginia, Alan K. Jasper
OES Theses and Dissertations
The Norfolk, Kempsville, and Sand Bridge Formations beneath the HIckory Scarp of southeastern Virginia are reinterpreted as representing one glacio-eustatic transgressive cycle. The timing of this transgressive event is set during the earliest Wisconsinan. The formations were previously interpreted as unconformable overlying one another. The Norfolk-Kempsville unconformity is actually a diagenetic boundary. Evidence is presented which indicates that the Kempsville Scarp area should be reduced to member status or dropped entirely.
Nebraska's Platte River: A Graphic Analysis Of Flows, Ray Bentall
Nebraska's Platte River: A Graphic Analysis Of Flows, Ray Bentall
Conservation and Survey Division
WSP-53
Impact Of Urban Stormwater Runoff On The Water Quality Of The Subsurface Lost River, Bowling Green, Kentucky, Donald Rice
Impact Of Urban Stormwater Runoff On The Water Quality Of The Subsurface Lost River, Bowling Green, Kentucky, Donald Rice
Masters Theses & Specialist Projects
Bowling Green, Kentucky is located in a distinctive karst region, characterized by subsurface drainage. The Lost River is a large subsurface stream which flows beneath the city. It receives much of the stormwater runoff from Bowling Green, since most of the city's runoff is directed underground. Significant pollutants in Bowling Green's stormwater runoff were identified from water quality test results of storm event grab samples, and a composite sample, of runoff entering the urban By-Pass Cave. Water quality test results were also obtained from storm event grab samples, and a composite sample, of the Lost River at the Blue Hole …
Water-Soluble Material On Aerosols Collected Within Volcanic Eruption Clouds, David B. Smith, Robert A. Zielinski, William I. Rose, B. J. Huebert
Water-Soluble Material On Aerosols Collected Within Volcanic Eruption Clouds, David B. Smith, Robert A. Zielinski, William I. Rose, B. J. Huebert
Department of Geological and Mining Engineering and Sciences Publications
In February and March of 1978, filter samplers mounted on an aircraft were used to collect the aerosol fraction of the eruption clouds from three active Guatemalan volcanoes (Fuego, Pacaya, and Santiaguito). The samples were collected on Teflon (Fluoropore) filters with a nominal pore diameter of 0.5μm. The mass of air sampled by the filters ranged from 0.15 to 6.6 kg. The particulate material collected consisted of fragments of angular silicate ash and droplets of what is interpreted as dilute H2SO4 and HCl. After collection of the samples, each filter was rinsed with 60 ml of distilled-deionized …
Small Particles In Plumes Of Mount St. Helens, William I. Rose, Raymond L. Chuan, D. C. Woods
Small Particles In Plumes Of Mount St. Helens, William I. Rose, Raymond L. Chuan, D. C. Woods
Department of Geological and Mining Engineering and Sciences Publications
Particles in the size range of 0.1–25 micrometers were sampled by aircraft carrying a quartz crystal microcascade in the Mount St. Helens plume on three dates in August and September 1980. Two of the sampling dates represented ‘typical’ emissions of the volcano between plinian eruptions. One sampling flight was made 1–4 hours before the small plinian eruption of August 7, 1980, when the plume had become discontinuous and visibly darker. Size distributions were determined, and individual particles were studied by using scanning electron microscopy. The plume sampled on August 7, before the eruption, contained mainly approximately 2 micrometer diameter silicic …
Metal Inventory And Fate Of Suspended Sediment In Chesapeake Bay, Maynard M. Nichols, Galen Thompson, Bruce Nelson
Metal Inventory And Fate Of Suspended Sediment In Chesapeake Bay, Maynard M. Nichols, Galen Thompson, Bruce Nelson
Reports
This report aims to provide new information that meets selected objectives of the EPA-States Taxies Plan of Action: i.e. (1) to determine the state of the Bay with respect to the distribution and concentration of selected metals in suspended material and fluid mud; (2) to establish the temooral variations of sediment and metal loading: (3) to identify potential zones of metal accumulation and trace their transport routes, and (4) to provide recommendations for monitoring contaminated sediment.
Field observations provide longitudinal coverage of the Bay with transects into Baltimore Harbor and Hampton Roads. They include contrasting conditions of seasonal high-low river …
Groundwater Levels In Nebraska, 1981, Martin S. Johnson, Darryll T. Pederson
Groundwater Levels In Nebraska, 1981, Martin S. Johnson, Darryll T. Pederson
Conservation and Survey Division
No abstract provided.
Nonpoint Agricultural Pollution In A Karst Aquifer: Lost River Groundwater Drainage Basin, Warren County, Kentucky, Nancy Tucker
Nonpoint Agricultural Pollution In A Karst Aquifer: Lost River Groundwater Drainage Basin, Warren County, Kentucky, Nancy Tucker
Masters Theses & Specialist Projects
Chemical analysis of samples collected from subsurface streams and wells were analyzed to identify nonpoint pollutants in karst aquifers resulting from agricultural land use. Major flow paths and travel times taken by nonpoint pollutants were identified. A land use limitation map showing areas where agricultural activities may results in nonpoint pollution of the karst aquifer was prepared. A groundwater susceptibility map was prepared to show areas of the karst aquifer most susceptible to groundwater contamination by nonpoint pollution resulting from agricultural land use.
Research findings revealed that pollutant concentrations may reach levels thousands of times greater during high discharge events …
Subduction Of The Caribbean Plate And Basement Uplifts In The Overriding South American Plate, James N. Kellogg, William E. Bonini
Subduction Of The Caribbean Plate And Basement Uplifts In The Overriding South American Plate, James N. Kellogg, William E. Bonini
James N Kellogg
Abstract. The new tectonic interpretations presented in this paper are based on geologic field mapping and gravity data supplemented by well logs, seismic profiles, and radiometric and earthquake data. The present Caribbean-South American plate boundary is the South Caribbean marginal fault, where subduction is indicated by folding and thrusting in the deformed belt and a seismic zone that dips 30o to the southeast and terminates 200 km below the Maracaibo Basin. The Caribbean-South American convergence rate is estimated as 1.9 +_. 0.3 cm/yr on the basis of the 390-km length of the seismic zone and a thermal equilibration time of …
Geology And Hydrothermal Alteration, Glass Buttes, Southeast Oregon, Dulcy Annette Berri
Geology And Hydrothermal Alteration, Glass Buttes, Southeast Oregon, Dulcy Annette Berri
Dissertations and Theses
The Glass Buttes volcanic complex consists of many domes and individual vents that erupted both rhyolitic and basaltic lavas during the late Miocene to early Pliocene. The east half of the complex, in the vicinity of Little Glass Butte, contains interfingering, finely flow-banded rhyolite and black obsidian flows. The youngest unit, an obsidian, has been dated at 4.9 m.y. East of Little Glass Butte lie two northwest-trending ridges, Antelope and Cascade Ridges, composed of two or more overlapping exogenous domes that formed along northwest-trending faults.
Thermometry And Barometry Of Precambrian Orthogneisses And Related Rocks From The Minnesota River Valley, Southwestern Minnesota, Paula J. Leier
Thermometry And Barometry Of Precambrian Orthogneisses And Related Rocks From The Minnesota River Valley, Southwestern Minnesota, Paula J. Leier
Undergraduate Theses and Senior Projects
Granulite facies metamorphism is reported to have occurred in the Granite Falls-Montivideo area of the Minnesota River Valley and a broader view of the valley is taken to determine the extent of granulite facies metamorphism. Pressures and temperatures of metamorphism were determined using two geothermometers and one geobarometer. Based upon two-feldspar and garnet-biotite thermometers, temperature of metamorphism is approximated at 600 °c. Metamorphic pressures based on the reaction cordierite= garnet+ quartz + sillimanite were probably between 4 and 6 Kbars. Based on barometry and thermometry, it is suggested the Algoman o rogeny (2600 m.y. ago) was at least upper amphibolite …
Chemical Changes In Groundwater Of Northern Utah Valley, Utah, Paul E. Fairbanks
Chemical Changes In Groundwater Of Northern Utah Valley, Utah, Paul E. Fairbanks
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Northern Utah Valley is one of the fastest growing areas of Utah and has increasing needs for domestic, industrial, and agricultural water. To meet these needs, groundwater and surface water systems must be understood to maximize their use. Chemical studies of the sediment mineralogy and related water-chemistry give insight to the movement of the water.
There are three major aquifers present in the valley: shallow Pleistocene; deep Pleistocene; and Tertiary. They are composed of sands and gravels and are separated by confining layers (aquitards) composed mostly of clay. Along the flanks of the bordering mountains there are undifferentiated aquifers which …
Evaluation Of Low-Temperature Geothermal Potential In Cache Valley, Utah, Janet L. De Vries
Evaluation Of Low-Temperature Geothermal Potential In Cache Valley, Utah, Janet L. De Vries
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
The purpose of this research was to continue the assessment of the low-temperature geothermal resources of Cache Valley, Utah initiated by the Utah Geological and Mineral Survey. Field work consisted of locating 90 wells and springs throughout the study area, collecting water samples for later laboratory analyses, and field measurement of pH, temperature, bicarbonate alkalinity, and electrical conductivity. Na+, K+, Ca+2 , Mg+2 , SiO2, Fe, SO4-2, Cl-, F-, and total dissolved solids were determined in the laboratory.
Temperature profiles were measured in 12 additional, …
Petrology Of The Lower Middle Cambrian Langston Formation, North-Central Utah And Southeastern Idaho, Gary Jay Buterbaugh
Petrology Of The Lower Middle Cambrian Langston Formation, North-Central Utah And Southeastern Idaho, Gary Jay Buterbaugh
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
The Lower Middle Cambrian Langston Formation was studied in the Bear River Range of north-central Utah and southeasternmost Idaho and the Wellsville Mountains of north-central Utah. The depositional textures and sedimentary structures preserved within the rocks were compared with characteristics of similar modern sediments and ancient rock to determine environments of deposition, paleogeography, diagenetic alteration and pattern of dolomitization.
The rocks of the Langston Formation were divided into eleven different rock types. These eleven rock types were formed within four recognizable lithofacies: 1) upper peritidal; 2) inner carbonate shelf; 3) inner clastic shelf; and 4) outer clastic shelf.
The general …
Structure And Petrography Of The Tertiary Volcanic Rocks Between Death Creek And Dairy Valley Creek (Box Elder Co.), Utah, E. Matthew Hare
Structure And Petrography Of The Tertiary Volcanic Rocks Between Death Creek And Dairy Valley Creek (Box Elder Co.), Utah, E. Matthew Hare
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Several volcanic flows lie between Death Creek and Dairy Valley Creek, near Etna, Utah. The major, central portion of the volcanic flows is composed of dacite and dacite vitrophyre. An elongate ridge in the southeastern corner of the study area and several small outcrops in Death Creek Valley are composed of rhyolite and rhyolite vitrophyre. Additional rock types include conglomerate, volcanic ash, and tuffaceous sedimentary rock of the Tertiary Salt Lake Formation, Paleozoic limestone, and Tertiary basalt.
Dacite and dacite vitrophyre samples are porphyritic, containing phenocrysts of plagioclase, quartz, biotite, amphibole, orthopyroxene, and iron-titanium oxides. Rhyolite and rhyolite vitrophyre samples …
Tertiary Peleomagnetism Of The North Cascade Range, Washington, Myrl E. Beck Jr., Russ R. Burmester, Ruth Schoonover
Tertiary Peleomagnetism Of The North Cascade Range, Washington, Myrl E. Beck Jr., Russ R. Burmester, Ruth Schoonover
Geology Faculty Publications
We have obtained paleomagnetic data for the southern tiip of the middle Tertiary Chilliwack Composite Batholith, located on the Canada-United States border about 125 km E of Vancouver, B.C. Thirty-four separately oriented samples were collected along a road traverse 1.5 km long located along State Highway 22, about 20 km NE of Marblemount, Washington. The mean direction after magnetic cleaning is: D, 182.8°; I, -65.0°; α95, 1.5°. This corresponds to a paleomagnetic pole at 87.5°N, 267.5°E, close to other poles for Tertiary plutons from the North Cascades and only slightly displaced from Tertiary reference poles from the craton. …
Petrology Of The Middle Cambrian Blacksmith Formation, North-Central Utah, Howard William Hay Jr.
Petrology Of The Middle Cambrian Blacksmith Formation, North-Central Utah, Howard William Hay Jr.
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
The dolostones and dolomitic limestones of the Middle Cambrian Blacksmith Formation were studied in the Bear River and Malad Ranges and the Wellsville Mountains of north-central Utah. The depositional textures and sedimentary structures retained within the rocks form the basis of subdivisions of measured sections, interpretation of depositional paleogeography, and reconstruction of environments.
Other studies of modern carbonate environments and their ancient analogues provided the basis for interpretation of the depositional textures found within the rocks of the Blacksmith Formation. Four identifiable lithofacies were recognized within the study area. These facies include: (1) oolite shoal; (2) restricted lagoon; (3) low- …
Petrology And Mineralogy Of Tertiary Volcanic Rocks In The Vicinity Of The Rozel Hills And Black Mountain, Box Elder County, Utah, Elizabeth R. Greenman
Petrology And Mineralogy Of Tertiary Volcanic Rocks In The Vicinity Of The Rozel Hills And Black Mountain, Box Elder County, Utah, Elizabeth R. Greenman
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Two basalt flows and an andesite fissure eruption occur in the Rozel Hills - Black Mountain area in Box Elder County, Utah. Both basalt flows are aphanitic, and contain olivine, plagioclase, augite, and opaque oxides. They may be distinguished both chemically and on the basis of their textures. Unit 2 basalt is finer grained, and appears to be associated with a fault in the Black Mountain area. Chemically, it is similar to high-iron lavas in the Craters of the Moon, Idaho area. It has higher alkali, total iron, and titanium contents that Unit 1 basalt. Unit 1 basalt is similar …
The Features And Significance Of Layering And Shearing Within The Zone Of Mylonitization, Northeastern Idaho Batholith, Jon Michael Hermann
The Features And Significance Of Layering And Shearing Within The Zone Of Mylonitization, Northeastern Idaho Batholith, Jon Michael Hermann
Masters Theses
The northeastern border zone of the Idaho batholith contains a north-south trending zone of myionitized gneiss, schist, and granite-granodiorite. The schist and gneiss contain plagioclase augen surrounded by crushed and recrystallized biotite, quartz, feldspar, + muscovite, + hornblende. The granite grades upward from porphyritic rock into augen-bearing mylonitic rocks interlayered with schist and gneiss.
Regional Interpretation Of The Cenozoic Volcanism Of Si̇mav And Surrounding Area, Tuncay Ercan, Erdoğdu Günay, Mehmet Yılmaz Savaşçin
Regional Interpretation Of The Cenozoic Volcanism Of Si̇mav And Surrounding Area, Tuncay Ercan, Erdoğdu Günay, Mehmet Yılmaz Savaşçin
Bulletin of the Mineral Research and Exploration
No abstract provided.
The Geology Of The Bodrum Peninsula, Tuncay Ercan, Erdoğdu Günay, Ahmet Türkecan
The Geology Of The Bodrum Peninsula, Tuncay Ercan, Erdoğdu Günay, Ahmet Türkecan
Bulletin of the Mineral Research and Exploration
No abstract provided.
The Unintended Impacts Of Anti-Redlining Legislation, Risa Palm, James Corbridge
The Unintended Impacts Of Anti-Redlining Legislation, Risa Palm, James Corbridge
Geosciences Faculty Publications
Federal and state legislation intended to curb the practice of geographic loan discrimination or redlining may have the unintended and undesirable effect of preventing mortgage originators from using environmental characteristics as criteria in lending evaluations. Since the California fault rupture zones (special studies zones) do not contain systematic concentrations of poor, black, or elderly households, they should be targets for differential lending policies, such as mandatory earthquake insurance or structural reinforcements as conditions for mortgage loans. A clarification of the wording of the Housing Financial Discrimination Act is needed to alleviate some of the present potentially damaging effects of failing …
Investigation Of Subsurface Tar-Sand Deposits In Western Kentucky, David A. Williams, Martin C. Noger, Patrick J. Gooding
Investigation Of Subsurface Tar-Sand Deposits In Western Kentucky, David A. Williams, Martin C. Noger, Patrick J. Gooding
Information Circular--KGS
Tar sands (also referred to as asphaltic sandstones, heavy-oil deposits, or bitumen-impregnated sandstones) in western Kentucky have been recognized as a potential mineral resource for over l 00 years. Past commercial development has been restricted largely to use as paving material. However, because of the ever-expanding demands for energy, these deposits have become the subject of increasing interest as a potential petroleum resource.
Previous studies have provided estimates of the potential resources of shallow mineable tar-sand deposits; these investigations have concentrated on the outcrop areas where tar sands are present at or near the surface. Data on subsurface deposits have …
The Petrochemistry Of The Ankara Volcanics, Central Turkey, Jay A. Ach
The Petrochemistry Of The Ankara Volcanics, Central Turkey, Jay A. Ach
Geology Theses and Dissertations
The Ankara volcanics comprise a small volcanic field immediately to the north of Ankara, Turkey. This volcanic field is composed of a mixture of flows, tuffs, and agglomerates, with the flows ranging in composition from high-K basaltic andesite to rhyolite. Dacitic flows are the most common. A potassium-argon date gives a Middle Eocene age of 42.0 ± 1.6 m.y. The volcanics unconformably overlie Paleozoic sediments of the "Cimmerian continent" to the south and Mesozoic rocks of the Ankara melange to the north.
Results of analyses on 25 samples for major elements and Y, Sr, Rb, Ni, Cr, V, Co, Zn, …
The Structural Geology Of The Tectonized Ultramafic Suite Of The Table Mountain Massif, Bay Of Islands Complex, Newfoundland, Robert Whitney Blake
The Structural Geology Of The Tectonized Ultramafic Suite Of The Table Mountain Massif, Bay Of Islands Complex, Newfoundland, Robert Whitney Blake
Geology Theses and Dissertations
Table Mountain is the northernmost massif in the Bay of Islands Ophiolite. It represents a continuous, approximately 7 kilometer thick, section of residual harzburgite tectonites capped by a nearly flat-lying assemblage of deformed and undeformed cumulate rocks. The notable mesoscopic structural features of the massif include a zone of penetrative deformation extending upsection from the tectonized harzburgites approximately 500 meters into the dunites and basal cumulates. The orientation of the foliation and associated lineations as well as the inferred shear sense within the zone is consistent with that affecting the harzburgites. Highly deformed dunite lenses which range in thickness up …
The Geology Of The Oceanographer Transform Fault, Richard H. Moody Jr.
The Geology Of The Oceanographer Transform Fault, Richard H. Moody Jr.
Geology Theses and Dissertations
A detailed survey of the Oceanographer transform fault and environs at 35º N, 35ºW has yielded detailed information with respect to the generation and evolution of seafloor at a slowly accreting plate margin. From this data detailed bathymetric maps and maps of depth to basement have been constructed for a swath of seafloor 1800 km long and 100-200 km wide centered about the offset region. This data was used to subdivide major phases of seafloor spreading during the Tertiary. The ridge crest and all major topographic features near the transform appear to be affected by their proximity to the transform. …