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2005

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Articles 31 - 45 of 45

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The Role Of Transverse Faults In Great Basin Extension: Transfer Faults Or N-S Extension?, Tandis S Bidgoli Jan 2005

The Role Of Transverse Faults In Great Basin Extension: Transfer Faults Or N-S Extension?, Tandis S Bidgoli

UNLV Retrospective Theses & Dissertations

New geologic map data (1:24,000 scale), geometric analyses, and kinematic analyses in the vicinity of the Crescent Spring fault zone (CSFZ), an E-W-striking fault zone in eastern Nevada, allow the recognition of four distinct extensional episodes. The episodes are pre-volcanic (pre-27 Ma), syn-volcanic (∼27-18 Ma), Miocene (?) post-volcanic, and Miocene (?) - Pliocene or Quaternary post-volcanic extension. This extensional pattern, which is consistent with other fault studies along the broadly defined Timpahute lineament, has several important aspects. (1) Transverse faults of the CSFZ are normal faults that accommodated a distinct N-S extensional event. (2) The strain field within this part …

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Petrogenesis And Geochemistry Of Pleistocene And Pliocene Basalt Flows Of The Pine Valley Volcanic Field, Utah And Their Relationship To The Tectonics Of The Utah Transition Zone, Matthew Faust Jan 2005

Petrogenesis And Geochemistry Of Pleistocene And Pliocene Basalt Flows Of The Pine Valley Volcanic Field, Utah And Their Relationship To The Tectonics Of The Utah Transition Zone, Matthew Faust

UNLV Retrospective Theses & Dissertations

The Pine Valley Volcanic Field in southwestern Utah consists of at least 24 mafic lava flows and 10 vents. Eruptions have spanned the past 2.4 m.y. The youngest eruptions at the Snow Canyon and Diamond Valley cones occurred between 1 and 20 ka. Lava flows range in composition from basalt to andesite, and include both alkaline and subalkaline rocks throughout the field. Trace element abundances for the youngest lavas show both oceanic island basalt (OIB) and mid-oceanic ridge basalt (MORB) components in their source. Sr and Nd isotopic ratios exhibit evolved values, spanning a large range from epsilon Nd of …

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Geologic Map And Topographic Profile Of The Newark Quadrangle, Nebraska, Steven M. Condon Jan 2005

Geologic Map And Topographic Profile Of The Newark Quadrangle, Nebraska, Steven M. Condon

United States Geological Survey: Publications

Newark Quadrangle, Nebraska

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Geologic Map And Topographic Profile Of The Elm Creek West Quadrangle, Nebraska, Steven M. Condon Jan 2005

Geologic Map And Topographic Profile Of The Elm Creek West Quadrangle, Nebraska, Steven M. Condon

United States Geological Survey: Publications

Geologic Map and Topographic Profile of the Elm Creek West Quadrangle, Nebraska

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Geologic Studies Of The Platte River, South-Central Nebraska And Adjacent Areas—Geologic Maps, Subsurface Study, And Geologic History, Steven M. Condon Jan 2005

Geologic Studies Of The Platte River, South-Central Nebraska And Adjacent Areas—Geologic Maps, Subsurface Study, And Geologic History, Steven M. Condon

United States Geological Survey: Publications

The Platte River of south-central Nebraska was studied at three scales to place the river in its geological context and to trace its evolution through geologic time. At the largest scale the Elm Creek West and the Newark 7.5 minute quadrangles were mapped. These quadrangles are located just west and just east of Kearney and serve to illustrate the main geomorphic elements of the present Platte River Valley. The central elements of the quadrangles are the Platte River channels, islands, and bottomlands, which are flanked by terraces that step up away from the river to the north and south. Significant …

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Sulfur And Oxygen Isotopic Record In Sulfate And Sulfide Minerals Of Early, Deep, Pre-Main Stage Porphyry Cu–Mo And Late Main Stage Base-Metal Mineral Deposits, Butte District, Montana, C.W. Field, L. Zhang, J.H. Dilles, Robert O. Rye, M.H. Reed Jan 2005

Sulfur And Oxygen Isotopic Record In Sulfate And Sulfide Minerals Of Early, Deep, Pre-Main Stage Porphyry Cu–Mo And Late Main Stage Base-Metal Mineral Deposits, Butte District, Montana, C.W. Field, L. Zhang, J.H. Dilles, Robert O. Rye, M.H. Reed

Geochemistry of Sulfate Minerals: A Tribute to Robert O. Rye

Typical porphyry-type Cu–Mo mineralization occupies two connected domal centers, the eastern Pittsmont and western Anaconda domes, that predate and largely underlie the well-known, throughgoing, Main Stage polymetallic veins of Butte. Among the sulfur-bearing minerals recovered from deep drill core of this early pre-Main Stage hydrothermal assemblage are anhydrite, chalcopyrite, pyrite, and molybdenite in veinlets bordered by K-silicate alteration, and pyrite from slightly younger quartz–pyrite veinlets with dgray-sericiticT alteration selvages. The ranges of δ34S values for minerals of the K-silicate assemblage are 9.8–18.2%◦ for anhydrite (n=23 samples), 3.0%◦ to 4.7%◦ for molybdenite (n=6), 0.4%◦ to 3.4%◦ for pyrite (n=19), …

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Chromian Spinel–Olivine Phase Chemistry And The Origin Of Primitive Basalts Of The Southern Washington Cascades, Diane R. Smith, W. P. Leeman Jan 2005

Chromian Spinel–Olivine Phase Chemistry And The Origin Of Primitive Basalts Of The Southern Washington Cascades, Diane R. Smith, W. P. Leeman

Earth and Environmental Geosciences Faculty Research

Geochemically diverse basalts occur in an ~160-km-wide transect that stretches across the Quaternary southern Washington Cascades (SWC) volcanic arc. Two fundamental groups of SWC basalts can be identified on the basis of major and trace element chemistry. On primitive mantle-normalized “spidergrams”, Group I lavas resemble within-plate basalts, whereas Group II lavas exhibit chemical characteristics (e.g., Nb, Ta, and Ti depletions) typical of subduction-related magmas. The primitive nature of many SWC basalts is indicated by their high MgO (>6.5 wt.%, up to 9.5 wt.%), Ni (>85 ppm) and Cr (>180 ppm) contents. Electron microprobe analyses of olivine–spinel pairs …

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Gardner V. Board Of County Commissioners Of Wasatch County : Brief Of Appellant, Utah Court Of Appeals Jan 2005

Gardner V. Board Of County Commissioners Of Wasatch County : Brief Of Appellant, Utah Court Of Appeals

Utah Court of Appeals Briefs (1996–2006)

BRIEF OF THE APPELLANTS APPEAL FROM THE FINAL ORDERS OF THE FOURTH DISTRICT COURT, UTAH COUNTY, JUDGES JAMES R. TAYLOR & ANTHONY W. SCHOFIELD

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Quantitative Clay Mineralogy Of Several Louisiana Soils, Johan Forsman Jan 2005

Quantitative Clay Mineralogy Of Several Louisiana Soils, Johan Forsman

LSU Master's Theses

A method was developed to simplify the approach to obtaining a better quantitative representation (QR) of complex clay mineral assemblages by XRD analysis. The method has eight steps: 1) preparation of samples with preferred orientation; 2) qualitative identification of phases; 3) peak decomposition to obtain precise locations of individual peaks contained within broad diffraction bands; 4) creation of a library of theoretical XRD patterns by modeling of one-dimensional XRD patterns; 5) selection of experimental library patterns; 6) employing the LINEST function found in common spreadsheet software to fit library patterns to experimental patterns; 7) evaluation of results to determine needed …

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Ground Penetrating Radar Response To Thin Layers: Examples From Waites Island, South Carolina, Swagata Guha Jan 2005

Ground Penetrating Radar Response To Thin Layers: Examples From Waites Island, South Carolina, Swagata Guha

USF Tampa Graduate Theses and Dissertations

Thin layers (layers that are not resolvable in terms of GPR wavelengths) are very common in sedimentary deposits. To better understand ground penetrating radar (GPR) wave behavior in sequences of thin layers with contrasting electromagnetic parameters, 1D FDTD simulations are run for simple layer distributions. Laminated (mm-scale) sequences can produce reflected energy with 10-20% of the amplitude of reflections from equivalent isolated contacts. Amplitude spectra from laminae packages are shifted toward higher frequencies. Such spectral shifts in radar profiles may potentially be used as indicators of fine-scale laminations. A comparative study of GPR records and models generated from core data …

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Oil & Gas Law - Royalty Dethroned: Wyoming's Approach To Gathering Costs, Rickey Turner Jan 2005

Oil & Gas Law - Royalty Dethroned: Wyoming's Approach To Gathering Costs, Rickey Turner

Wyoming Law Review

No abstract provided.

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Integrating Visible, Near Infrared And Short Wave Infrared Hyperspectral And Multispectral Thermal Imagery For Geological Mapping At Cuprite, Nevada, Xianfeng Chen Jan 2005

Integrating Visible, Near Infrared And Short Wave Infrared Hyperspectral And Multispectral Thermal Imagery For Geological Mapping At Cuprite, Nevada, Xianfeng Chen

Graduate Theses, Dissertations, and Problem Reports (ETD)

Visible, near infrared (VNIR), and short wave infrared (SWIR) hyperspectral and thermal infrared (TIR) multispectral remote sensing have become potential tool for geological mapping. In this dissertation, a series of studies were carried out to investigate the potential impact of combining VNIR/SWIR hyperspectral and TIR multispectral data for surface geological mapping. First, a series of simulated data sets based on the characteristics of hyperspectral AVIRIS and multispectral TIR MASTER sensors was created from surface reflectance and emissivity library spectra. Five common used classification methods including minimum distance, maximum likelihood, spectral angle mapper (SAM), spectral feature fitting (SFF), and binary encoding …

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New Stratigraphic Subdivision, Depositional Environment, And Age Estimate For The Upper Cretaceous Djadokhta Formation, Southern Ulan Nur Basin, Mongolia, Demberelyin Dashzeveg, Lowell Dingus, David B. Loope, Carl C. Swisher Iii, Togtokh Dulam, Mark R. Sweeney Jan 2005

New Stratigraphic Subdivision, Depositional Environment, And Age Estimate For The Upper Cretaceous Djadokhta Formation, Southern Ulan Nur Basin, Mongolia, Demberelyin Dashzeveg, Lowell Dingus, David B. Loope, Carl C. Swisher Iii, Togtokh Dulam, Mark R. Sweeney

Department of Earth and Atmospheric Sciences: Faculty Publications

Studies of key and newly discovered sections of the Upper Cretaceous Djadokhta Formation along the southern margin of the Ulan Nur Basin allow a new subdivision based on lithology. The formation and its members were mapped at both Bayn Dzak, an area that includes the Flaming Cliffs, and Tugrugyin Shireh, an area about 50 km to the northwest of Bayn Dzak. Stratigraphic sections at both localities were remeasured. The considerably enlarged formation comprises a lower Bayn Dzak Member, dominated by moderate reddish orange sands with subordinate mudstone units, and an upper Tugrugyin Member, composed of pale orange to light gray …

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Sedimentary And Tectonic Evolution Of The Flint Creek Basin West-Central Montana, Ryan A. Portner Jan 2005

Sedimentary And Tectonic Evolution Of The Flint Creek Basin West-Central Montana, Ryan A. Portner

Graduate Student Theses, Dissertations, & Professional Papers

No abstract provided.

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Lidar Based Predevelopment Digital Elevation Model Of Southeastern Palm Beach County, Florida, Mary Beth Stoddard Jan 2005

Lidar Based Predevelopment Digital Elevation Model Of Southeastern Palm Beach County, Florida, Mary Beth Stoddard

Electronic Theses and Dissertations 2000 - 2009

A new technique was devised that produces a LIDAR based predevelopment Digital Elevation Model and offers a more superior visualization, of the natural landscape prior to development, than the Bare Earth Model produced by Florida International University's Hurricane Center. Two locations in southeastern Florida have been chosen for this study. The first site is utilized as a control for testing the model and contains a present day ridge system that runs north and south through the Boca Raton cemetery. The second site is a paleowatershed, the Yamato Marsh which was located in Delray Beach. Modeling of the marsh site will …

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