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

Earth Sciences Commons

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

7,860 Full-Text Articles 12,335 Authors 1,168,414 Downloads 140 Institutions

All Articles in Earth Sciences

Faceted Search

7,860 full-text articles. Page 1 of 129.

Agenda: Innovations In Managing Western Water: New Approaches For Balancing Environmental, Social, And Economic Outcomes, University of Colorado Boulder. Getches Wilkinson Center for Natural Resources, Energy, and the Environment 2015 University of Colorado Law School

Agenda: Innovations In Managing Western Water: New Approaches For Balancing Environmental, Social, And Economic Outcomes, University Of Colorado Boulder. Getches Wilkinson Center For Natural Resources, Energy, And The Environment

Innovations in Managing Western Water: New Approaches for Balancing Environmental, Social and Economic Outcomes (Martz Summer Conference, June 11-12)

Many aspects of western water allocation and management are the product of independent and uncoordinated actions, several occurring a century or more ago. However, in this modern era of water scarcity, it is increasingly acknowledged that more coordinated and deliberate decision-making is necessary for effectively balancing environmental, social, and economic objectives. In recent years, a variety of forums, processes, and tools have emerged to better manage the connections between regions, sectors, and publics linked by shared water systems. In this event, we explore the cutting edge efforts, the latest points of contention, and the opportunities for further progress.


Mobilization Of Metals By Fungi In Historic Cemeteries, Eleanor D. Briggs 2015 Bates College

Mobilization Of Metals By Fungi In Historic Cemeteries, Eleanor D. Briggs

Geology Theses

Interactions among fungi, soil, and metals are at the heart of nutrient cycling in terrestrial systems. Both major and trace elements are found in soils, but the degree to which they are biologically available is influenced by chemical weathering of soil minerals by fungi. In addition to contributing to weathering, mushrooms are known to bioaccumulate metals from soil, so edible mushrooms growing on soils contaminated with toxic metals can cause harm to those who eat them. This study focuses on metal content of mushrooms and soils from cemeteries that are suspected to be contaminated with arsenic as a result of ...


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 ...


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 ...


Zircon Chemistry In A Gabbro Pluton At House Mountain, Idaho, Danielle Terhaar, Mark Schmitz 2015 Boise State University

Zircon Chemistry In A Gabbro Pluton At House Mountain, Idaho, Danielle Terhaar, Mark Schmitz

College of Arts and Sciences Presentations

An Eocene (ca 45 million year old) gabbro pluton near House Mountain in southwest Idaho provides an opportunity to explore how the conditions of crystallization are recorded in zircon chemistry. Zircon is a zirconium silicate mineral present in trace amounts in magmas, which is capable of incorporating large, highly charged elements (e.g. transition metals, actinides, lanthanides) that do not easily substitute into other minerals. Variations in these elements can be used to track magma evolution. For example, the titanium concentration is related to the temperature at which zircon crystallizes from the magma; rare earth elements (REE) and the relative ...


Reconstructing The Geologic History Of The House Mountain Metamorphic Complex (Southern Idaho) Through Zircon Age And Geochemical Analysis, Eli Andersen, Mark Schmitz 2015 Boise State University

Reconstructing The Geologic History Of The House Mountain Metamorphic Complex (Southern Idaho) Through Zircon Age And Geochemical Analysis, Eli Andersen, Mark Schmitz

College of Arts and Sciences Presentations

Zircons from quartzo-feldspathic gneiss within the Precambrian (>725 Ma) siliciclastics of the House Mountain Metamorphic Complex of southwestern Idaho were studied to determine its origin and evolution. Cathodoluminescence imaging of internal zoning due to growth and recrystallization of zircon, along with laser ablation inductively coupled plasma mass spectrometer (LA-ICPMS) analysis of these zircons, reveal a complex history of metamorphism at House Mountain. Primary igneous crystallization in the orthogneiss occurred near 130 Ma. Convoluted regions of the zircons have ages ranging from 130 to 85 Ma. These younger ages are hypothesized to be related to lead loss and new crystal growth ...


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.


Insights Into The Adsorption Thermodynamics Of Arsenates On Boehmite, Nicholas Allen, Christopher V. Tran 2015 Georgia State University

Insights Into The Adsorption Thermodynamics Of Arsenates On Boehmite, Nicholas Allen, Christopher V. Tran

Georgia State Undergraduate Research Conference

No abstract provided.


Longitudinal Profile And Sediment Mobility As Geomorphic Tools To Interpret The History Of A Fluviokarst Stream System, John Woodside, Eric Wade Peterson, Toby Dogwiler 2015 Illinois State University

Longitudinal Profile And Sediment Mobility As Geomorphic Tools To Interpret The History Of A Fluviokarst Stream System, John Woodside, Eric Wade Peterson, Toby Dogwiler

International Journal of Speleology

The complex drainage systems within karst settings can result in atypical longitudinal profiles. Features, such as cave entrances, can be expressed as anomalous ‘bumps’ in the longitudinal profile of a stream if downcutting has continued upstream of the area in which the water is pirated to the subsurface. Horn Hollow, a fluviokarst valley located in Carter Caves State Park Resort in northeastern Kentucky, was examined for these types of features. The objectives of this study were to determine if sediment mobility can be used as a proxy for anomalous areas along the profile of the valley and if detailed cross-sections ...


Using Leaf Wax Biomarkers To Constrain Land-Use Changes Associated With Mississippian Settlements, Allison Karp 2015 Washington University in St Louis

Using Leaf Wax Biomarkers To Constrain Land-Use Changes Associated With Mississippian Settlements, Allison Karp

Undergraduate Research Symposium Posters & Abstracts

The largest settlement of the Mississipian Native American society, Cahokia Mounds, was inhabited from approximately 800 – 1350 CE. To better understand the environmental context of Cahokia’s decline, we attempt to constrain widespread agriculture associated with this settlement. We examine stable carbon isotopes in leaf waxes through lake sediment cores taken from Horseshoe Lake (Madison County, IL), about a mile away from the Cahokia site. By measuring the relative 13C content of leaf waxes through the sediment core, we can detect shifts coincident with the onset and decline of agricultural land use by the Cahokian settlement. We constructed a maize ...


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 ...


(U-Th)/He Chronologic Constraints On Secondary Fe-Oxide Mineralization In Southwestern New Mexico, Mike A. Channer, Alexis K. Ault 2015 Utah State University

(U-Th)/He Chronologic Constraints On Secondary Fe-Oxide Mineralization In Southwestern New Mexico, Mike A. Channer, Alexis K. Ault

Mike Channer

Temporal constraints on fluid flow, mineralization, and brittle deformation are important for understanding a variety of upper-crustal processes. However, limited radioisotopic methods exist to directly date these processes. Hematite commonly co-precipitates with economically valuable mineral phases in hydrothermal ore deposits, such as copper, uranium, gold, and other rare-earth elements, and occurs in fracture systems and faults. Hematite is amenable to (U-Th)/He dating, and we will apply this method to two case studies in the Rio Grande rift, New Mexico. First, a suite of millimeter-thick hematite- and turgite-coated fracture surfaces cross-cut an ~54-60 Ma porphyritic rhyolite near Lordsburg in southwest ...


2014-15 Assessment Of Lake Depth In Cedar Lake, Samuel L. Rice 2015 Cedarville University

2014-15 Assessment Of Lake Depth In Cedar Lake, Samuel L. Rice

The Research and Scholarship Symposium

In the fall of 2012, the CU Environmental Geology class did an assignment which produced a bathymetry (bottom-contour) map of Cedar Lake. Although the depth measurements using stadia rods and the position measurements using handheld GPS units were somewhat crude, the end result was a map that seemed to be a very reasonable depiction on the lake bottom configuration. In the fall 2014, measurements were again made as a part of an ongoing assessment to determine if sediment infill was occurring in the lake. The data gathering techniques duplicated those used in 2012, including equipment used. The primary difference between ...


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 ...


Comparison And Resolution Of Differences In Stream Velocity Values At Nwis Sites In The Upper Little Miami River Basin, Ohio, Matthew S. Cheney 2015 Cedarville University

Comparison And Resolution Of Differences In Stream Velocity Values At Nwis Sites In The Upper Little Miami River Basin, Ohio, 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 ...


Glacial Till Prospecting In Southwest Ohio: Implications For Improved Sampling, Dylan J. McKevitt 2015 Cedarville University

Glacial Till Prospecting In Southwest Ohio: Implications For Improved Sampling, Dylan J. Mckevitt

The Research and Scholarship Symposium

Glacial till (drift) prospecting has served a major role in corporate mineral exploration, especially for gold and diamond during the past 30 years. It involves analyzing heavy indicator minerals from bulk sampling of various glacial deposits in order to track up ice flow direction to the potential orebody (such as a kimberlite pipe or Cu-Ni deposit), a technique commonly used in Canada but not in the U.S. Heavy minerals including diamond, gold, and native copper have been found in Ohio glacial till; the provenance of these heavy minerals is the Precambrian bedrock north of Ohio. This study utilized standard ...


Determining Provenance Of Glacial Material In Southwestern Ohio, Jorian Krob 2015 Cedarville University

Determining Provenance Of Glacial Material In Southwestern Ohio, Jorian Krob

The Research and Scholarship Symposium

During the last glacial maximum, ice moved south from Canada to cover much of the northern United States. This included the northern and western portions of Ohio. As the ice migrated it picked up Canadian bedrock which it transported and then left in Ohio when the ice retreated. The goal of this project was to determine the provenance (the source of origin) of the glacial material that is located in Greene, Clark, Montgomery, Logan, and Champaign Counties in Ohio. To determine where in southern Canada the material in these counties came from, this project included literature review into the glacial ...


Focused Exhumation Along Megathrust Splay Faults In Prince William Sound, Alaska, Peter J. Haeussler, Phillip A. Armstrong, Lee M. Liberty, Kelly M. Ferguson, Shaun P. Finn, Jeanette C. Arkle, Thomas L. Pratt 2015 United States Geological Survey

Focused Exhumation Along Megathrust Splay Faults In Prince William Sound, Alaska, Peter J. Haeussler, Phillip A. Armstrong, Lee M. Liberty, Kelly M. Ferguson, Shaun P. Finn, Jeanette C. Arkle, Thomas L. Pratt

Geosciences Faculty Publications and Presentations

Megathrust splay faults are a common feature of accretionary prisms and can be important for generating tsunamis during some subduction zone earthquakes. Here we provide new evidence from Alaska that megathrust splay faults have been conduits for focused exhumation in the last 5 Ma. In most of central Prince William Sound, published and new low-temperature thermochronology data indicate little to no permanent rock uplift over tens of thousands of earthquake cycles. However, in southern Prince William Sound on Montague Island, apatite (U–Th)/He ages are as young as 1.1 Ma indicating focused and rapid rock uplift. Montague Island ...


Digital Commons powered by bepress