Open Access. Powered by Scholars. Published by Universities.®

Geology Commons

Open Access. Powered by Scholars. Published by Universities.®

2,740 Full-Text Articles 3,438 Authors 481,861 Downloads 98 Institutions

All Articles in Geology

Faceted Search

2,740 full-text articles. Page 1 of 48.

Analysis And Comparison Of Physical Properties And Morphology Of Impact Melt Flows On Venus And The Moon To Determine Atmospheric Controls, Christine Elizabeth Dong 2015 Bates College

Analysis And Comparison Of Physical Properties And Morphology Of Impact Melt Flows On Venus And The Moon To Determine Atmospheric Controls, Christine Elizabeth Dong

Geology Theses

Impact melt flows form when target material melted by an impact breaches the rim of the impact crater. The melt flows out and away from the crater, forming a lava flow. Such flows have been identified on Venus and the Moon by previous studies. This study aims to document impact melt flows on these two bodies to determine the differences, if any, between them, and to ascertain whether these differences are due to atmospheric conditions. Previously recorded morphological data from Robert Herrick of the Lunar and Planetary Institute and Neish et al. (2014) are used in conjunction with S-band (12 ...


A Study On Photodegradation And The Fate Of Pyrogenic Carbon, John T. Howell 2015 University of Southern Mississippi

A Study On Photodegradation And The Fate Of Pyrogenic Carbon, John T. Howell

Master's Theses

Accounting for all possible sources of atmospheric CO2 is a pressing issue today due to the increasing effects of climate change. Estimates suggested that on the order of 1.3 million tons of dissolved pyrogenic carbon (pyDOC) could be entering the northern Gulf of Mexico annually. Assessing the fate of pyDOC in aquatic systems is crucial to understanding ecosystem impacts and potential feedback to climate change. Current research indicates that despite a generally lower susceptibility to biodegradation than their unpyrolyzed equivalents, pyrogenic carbon is not environmentally inert. While the role of microorganisms on the fate and transformation ...


Aerosol Size Distribution Measurements During The 2014 Nasa Sarp Campaign In The Central Valley And Sierra Nevada Mountains In California, Victoria A. Hampton 2015 Western Kentucky University

Aerosol Size Distribution Measurements During The 2014 Nasa Sarp Campaign In The Central Valley And Sierra Nevada Mountains In California, Victoria A. Hampton

Honors College Capstone Experience/Thesis Projects

Aerosols are directly and indirectly related to global climate by scattering radiation and also by seeding cloud formation. As a part of the 2014 NASA Student Airborne Research Program (SARP), research flights were conducted over the Central California region to better understand air quality in large urban California cities and also in the Central Valley. Using a Droplet Measurement Technologies Ultra High Sensitivity Aerosol Spectrometer (DMT-UHSAS), aerosol size distributions were measured across geographic regions of interest. Previous research has suggested that aerosols originating in the Central Valley may travel eastward to the Sierra Nevada and, once lifted orographically, could suppress ...


Stratigraphy And Depositional Environment Of The Mesaverde Group In The Northern Bighorn Basin Of Wyoming, Gordon Adams 2015 University of Nebraska-Lincoln

Stratigraphy And Depositional Environment Of The Mesaverde Group In The Northern Bighorn Basin Of Wyoming, Gordon Adams

Dissertations & Theses in Earth and Atmospheric Sciences

A sedimentological, stratigraphical and palynological study was conducted on the upper Cretaceous (Campanian) Mesaverde Group over 27.5 km of a north-south-orientated outcrop belt in the northern Bighorn Basin, Wyoming. During the Campanian, the study area lay in the western part of the Cretaceous Western Interior Seaway. The study aims to provide a stratigraphic and paleoenvironmental analysis of the Mesaverde Group and to integrate findings with data from outcrop belts to the south (southern Bighorn Basin), north (Montana) and east (Powder River Basin).

The Mesaverde Group (371 - 515 m thick) comprises a succession of mainly coarsening-upward stratal cycles, with some ...


Geological Object Recognition In Extraterrestrial Environments, Gregory M. Elfers 2015 The University of Western Ontario

Geological Object Recognition In Extraterrestrial Environments, Gregory M. Elfers

University of Western Ontario - Electronic Thesis and Dissertation Repository

On July 4 1997, the landing of NASA’s Pathnder probe and its rover Sojourner marked the beginning of a new era in space exploration; robots with the ability to move have made up the vanguard of human extraterrestrial exploration ever since. With Sojourners landing, for the rst time, a ground traversing robot was at a distance too far from earth to make direct human control practical. This has given rise to the development of autonomous systems to improve the e?ciency of these robots,in both their ability to move,and their ability to make decisions regarding their environment ...


Marine Transgression And Vegetation Environments In St. Catherines Island, Georgia, Rachel Luu 2015 Georgia State University

Marine Transgression And Vegetation Environments In St. Catherines Island, Georgia, Rachel Luu

Georgia State Undergraduate Research Conference

No abstract provided.


On The Influence Of Ionic Strength On Radium And Strontium Sorption To Sandy Loam Soils, Brian A. Powell, Todd Miller, Daniel I. Kaplan 2015 Clemson University

On The Influence Of Ionic Strength On Radium And Strontium Sorption To Sandy Loam Soils, Brian A. Powell, Todd Miller, Daniel I. Kaplan

Journal of the South Carolina Academy of Science

Models which can estimate environmental transport of radioactive contaminants in natural and engineered systems are required to 1) deploy effective remediation strategies for contaminated sites, 2) design waste repositories for future waste streams, and 3) ensure protection of human and environmental health in all cases. These models require accurate transport parameters in order to correctly predict how these contaminants will move in the subsurface. This work aimed to determine more accurately the distribution coefficients for radium and strontium sorption to Savannah River Site (SRS) soils. Radium and strontium sorption to the soils was found to be highly dependent upon ionic ...


Relationship Of Surrounding Geology To Well Recovery Properties For Selected Cedarville University Water Supply Wells, Kaitlyn Sturm 2015 Cedarville University

Relationship Of Surrounding Geology To Well Recovery Properties For Selected Cedarville University Water Supply Wells, Kaitlyn Sturm

The Research and Scholarship Symposium

This study was conducted to ascertain the relationship between geology and recovery rates of three selected Cedarville University water supply wells. In order to determine the recovery rates, the three selected wells were individually pumped down and then water level measurements were taken as the water levels rose in the well bore. The collected field data was analyzed and compared to the drillers’ well logs from when the wells were originally drilled. The geologic conditions that were examined for the area immediately surrounding the wells included: bedrock lithology, glacial drift characteristics (type and thickness), ground-surface topography, and bedrock topography. The ...


Derivation Of Correction Coefficients For Stream Velocities, Upper Little Miami River Basin, Oh, Matthew S. Cheney 2015 Cedarville University

Derivation Of Correction Coefficients For Stream Velocities, Upper Little Miami River Basin, Oh, Matthew S. Cheney

The Research and Scholarship Symposium

The simplest method of determining stream velocity involves measuring how long it takes a floating object or material to move a certain distance downstream. This study tested a dog toy (mini tennis ball), a 2 inch diameter piece of pumice, a playing card, a full 16.9 oz. water bottle, and milk. The floats were released where the maximum velocity of the stream was found through the use of profiling with a simple flowmeter. The real-time data from a USGS-gaged stream only shows discharge and gage height (stage); it does not show velocity. However, the historic USGS-technician stream-flow-verification data for ...


Buildup And Infill Rates Of Sediment Behind Cedarcliff Falls Dam, Tyler K. Dix 2015 Cedarville University

Buildup And Infill Rates Of Sediment Behind Cedarcliff Falls Dam, Tyler K. Dix

The Research and Scholarship Symposium

Cedarcliff Falls Dam is a small man-made masonry dam that was constructed around 1869. The dam impounds a pool of water that is a half-mile long on Massie’s Creek near Cedarville, Ohio. This project’s goal was to ascertain the infill rate and character of the sediment that had built up since 1869. The field work involved the measurement of water depth through the length of the pool in order to create a bottom-contour map. In addition, the sediment type was examined throughout the pool. This work was accomplished by use of a boat, stadia rod, handheld GPS unit ...


Core Evolution Driven By Mantle Global Circulation, Peter Olson, Renaud Deguen, Maxwell L. Rudolph, Shijie Zhong 2015 Johns Hopkins University

Core Evolution Driven By Mantle Global Circulation, Peter Olson, Renaud Deguen, Maxwell L. Rudolph, Shijie Zhong

Geology Faculty Publications and Presentations

Reconstructions of the Phanerozoic history of mantle global circulation that include past plate motions are used to constrain the thermochemical evolution of the core. According to our mantle global circulation models, the present-day global average heat flux at the core-mantle boundary lies in the range 80-90 mW.m-2, with peak-to-peak, long wavelength lateral variations up to 100 mW.m-2 associated with compositional and thermal heterogeneity in the D”-layer. For core thermal conductivity in the range k=100-130 W.m-1.K-1 we infer that the present-day outer core is thermally unstable beneath the high seismic velocity ...


Strain Accomodation In The Footwall Of The Rubys Inn Thrust Fault, Hillsdale Canyon, Southern Utah, Claire Cleveland, Rhiannon M. Garrard, Devin M. McLemore, Jeff C.E. Yon, Genevieve Kidman, John S. MacLean 2015 Southern Utah University

Strain Accomodation In The Footwall Of The Rubys Inn Thrust Fault, Hillsdale Canyon, Southern Utah, Claire Cleveland, Rhiannon M. Garrard, Devin M. Mclemore, Jeff C.E. Yon, Genevieve Kidman, John S. Maclean

The Compass: Earth Science Journal of Sigma Gamma Epsilon

The Rubys Inn thrust fault in southern Utah has produced several styles of deformation in its footwall. This project describes four exceptionally well exposed examples of strain accommodation, including a mountain-scale, ductile footwall drag fold, cataclastic flexural slip between bedding surfaces of differing competencies, plastically deformed petrified wood within the zone of flexural slip, and cataclastic shear expressed as deformation bands. Such examples show how various lithologies can be deformed into a wide array of structures during a single deformation event. Furthermore, some of these structures result in changes in permeability, which are important for those interested in subsurface fluid ...


Karst Porosity Estimations From Archive Cave Surveys - Studies In The Buda Thermal Karst System (Hungary), Gáspár Albert, Magdolna Virág, Anita Erőss 2015 Eötvös Loránd University, Budapest

Karst Porosity Estimations From Archive Cave Surveys - Studies In The Buda Thermal Karst System (Hungary), Gáspár Albert, Magdolna Virág, Anita Erőss

International Journal of Speleology

The Buda Thermal Karst System is located under the densely populated hills of Budapest. One of its caves (Pál-völgy Cave System) is the longest cave of Hungary with 30.1 km. The research was done in this area as a methodological study to estimate karst porosity parameters of aquifers or hydrocarbon reservoirs. In this study two modeling methods are demonstrated. The volumetric modeling method was primarily aimed to determine the macro-scale (>0.5 m) conduit porosity (referred as macroporosity) of the study area as percentage of the incorporating limestone and marl. This method is based on archive survey data (maps ...


Beyond The Angle Of Repose: A Review And Synthesis Of Landslide Processes In Response To Rapid Uplift, Eel River, Northern Eel River, Northern California, Joshua J. Roering, Benjamin H. Mackey, Alexander L. Handwerger, Adam M. Booth, David A. Schmidt, Georgina L. Bennett, Corina Cerovski-Darriau 2015 University of Oregon

Beyond The Angle Of Repose: A Review And Synthesis Of Landslide Processes In Response To Rapid Uplift, Eel River, Northern Eel River, Northern California, Joshua J. Roering, Benjamin H. Mackey, Alexander L. Handwerger, Adam M. Booth, David A. Schmidt, Georgina L. Bennett, Corina Cerovski-Darriau

Geology Faculty Publications and Presentations

In mountainous settings, increases in rock uplift are often followed by a commensurate uptick in denudation as rivers incise and steepen hillslopes, making them increasingly prone to landsliding as slope angles approach a limiting value. For decades, the threshold slope model has been invoked to account for landslide-driven increases in sediment flux that limit topographic relief, but the manner by which slope failures organize themselves spatially and temporally in order for erosion to keep pace with rock uplift has not been well documented. Here, we review past work and present new findings from remote sensing, cosmogenic adionuclides, suspended sediment records ...


Bubble Mobility In Mud And Magmatic Volcanoes, Aaron Tran, Maxwell L. Rudolph, Michael Manga 2015 University of California - Berkeley

Bubble Mobility In Mud And Magmatic Volcanoes, Aaron Tran, Maxwell L. Rudolph, Michael Manga

Geology Faculty Publications and Presentations

The rheology of particle-laden fluids with a yield stress, such as mud or crystal-rich magmas, controls the mobility of bubbles, both the size needed to overcome the yield stress and their rise speed. We experimentally measured the velocities of bubbles and rigid spheres in mud sampled from the Davis-Schrimpf mud volcanoes adjacent to the Salton Sea, Southern California. Combined with previous measurements in the polymer gel Carbopol, we obtained an empirical model for the drag coefficient and bounded the conditions under which bubbles overcome the yield stress. Yield stresses typical of mud and basaltic magmas with sub-mm particles can immobilize ...


Intraformational Parabolic Recumbent Folds In The Coconino Sandstone (Permian) And Two Other Formations In Sedona, Arizona (Usa), John Whitmore, Guy Forsythe, Paul A. Garner 2015 Cedarville University

Intraformational Parabolic Recumbent Folds In The Coconino Sandstone (Permian) And Two Other Formations In Sedona, Arizona (Usa), John Whitmore, Guy Forsythe, Paul A. Garner

Science and Mathematics Faculty Publications

We report sedimentary structures that in all ways resemble parabolic recumbent folds (PRFs) in the cross-bedded portions of the Schnebly Hill Formation, the Coconino Sandstone and the Toroweap Formation (Arizona, USA). Field evidence suggests they are penecontemporaneous and intraformational. Intraformational refers to deformation that occurs between undeformed beds. Recumbent cross-bed sets occur over a wide area (>375 km2 [144 mi2]) at many different locations and horizons in the Sedona area, especially within the Coconino Sandstone. Deformation resulting from slumping dunes (dry or damp) is ruled out because of the nature of the deformation along cross-bed dip, the size and length ...


4-D Evolution Of Anticlines And Implications For Hydrocarbon Exploration Within The Zagros Fold-Thrust Belt, Kurdistan Region, Iraq, Mjahid M. Zebari, Caroline M. Burberry 2015 Salahaddin University-Erbil, Iraq

4-D Evolution Of Anticlines And Implications For Hydrocarbon Exploration Within The Zagros Fold-Thrust Belt, Kurdistan Region, Iraq, Mjahid M. Zebari, Caroline M. Burberry

Papers in the Earth and Atmospheric Sciences

The Zagros Fold-Thrust Belt, extending from southern Iran, through northern Iraq and into Turkey, is characterized by elongate NW-trending anticlines that house large hydrocarbon accumulations. In recent years, the Kurdistan region of northern Iraq has become an area of interest for both structural studies and petroleum exploration-related investigation. Key questions to be answered concern the nature of the anticlines and whether the geometry of any associated thrusts can be predicted from surface geomorphology, as well the 4-D evolution of the area and along-strike continuity of the anticlines. To address these questions, this study combines field data, remote-sensing data concerning the ...


The Effect Of Basement Fault Reactivation On The Triassic—Recent Geology Of Kurdistan, North Iraq, Caroline M. Burberry 2015 University of Nebraska - Lincoln

The Effect Of Basement Fault Reactivation On The Triassic—Recent Geology Of Kurdistan, North Iraq, Caroline M. Burberry

Papers in the Earth and Atmospheric Sciences

The Zagros orogenic belt is underlain by a complex faulted Precambrian basement. Major fault trends originating in this basement have been invoked to explain large-scale structural changes along the strike of the orogen, e.g. the development of the Kirkuk Embayment (Kurdistan, Iraq) and the Lurestan Salient (Iran). However, within the Kirkuk Embayment, these structural trends have not previously been considered as an interacting group of faults which are periodically reactivated. This contribution first presents a revised basement fault map for the Kirkuk Embayment, created from interpreted gravity data, existing fault maps and remote sensing lineament analyses. This map is ...


Transformation Of Uranium In A Geological Environment, Derrell Hood 2015 Clemson University

Transformation Of Uranium In A Geological Environment, Derrell Hood

All Theses

Incorporation of uranium into iron oxide minerals is a promising mechanism for the environmental immobilization of U(VI). In this study, synthesized hematite was doped with uranium and analyzed with SEM-EDS, TEM, XRD, and ICP-MS. The results of this analysis strongly indicate uranium incorporation into the mineral, as well as the possible presence of a co-precipitated uranium mineral clarkeite. Preliminary results also shows an increase in the amount of uranium associated with the hematite particles as a function of mineral aging. Cyclic Voltammetry (CV) was used to induce and characterize electrochemical changes of uranium in the doped hematite system; these ...


Ua94/6/2/14 Annie Reis Personal Papers, WKU Archives 2015 Western Kentucky University

Ua94/6/2/14 Annie Reis Personal Papers, Wku Archives

WKU Archives Collection Inventories

Records created by and about Annie Reis during her years as a student at Western Kentucky State Normal School.


Digital Commons powered by bepress