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Articles 1 - 12 of 12
Full-Text Articles in Geology
Normal And Extreme Sedimentation And Physical Processes In Lake Tuborg, Ellesmere Island, Nunavut, Edward Lewis
Normal And Extreme Sedimentation And Physical Processes In Lake Tuborg, Ellesmere Island, Nunavut, Edward Lewis
Open Access Dissertations
Lake Tuborg is a large lake on west-central Ellesmere Island, Nunavut. Part of the lake is meromictic, and contains trapped saltwater below about 55 m depth. The lake receives meltwater and sediments from multiple sources, including snowmelt and glacier melt. A lake process study was undertaken from 2001-2003 at Lake Tuborg that involved obtaining profiles of water temperature, salinity, transmissivity, and dissolved oxygen. Networks of short and long sediment cores were also obtained throughout the lake. During the last year of monitoring the lake and its sediments, a large catastrophic drainage of an ice-dammed lake occurred (a jökulhlaup). This was …
Numerical Modeling Of Fracturing In Non-Cylindrical Folds: Case Studies In Fracture Prediction Using Structural Restoration, John Ryan Shackleton
Numerical Modeling Of Fracturing In Non-Cylindrical Folds: Case Studies In Fracture Prediction Using Structural Restoration, John Ryan Shackleton
Open Access Dissertations
This thesis contains several distinct studies aimed at better understanding fracturing in compressional fault-cored folds. At outcrops of growth strata in the Oliana anticline in the Spanish Pyrenees, the relationship of two joint sets may reflect changing mechanical properties (i.e. via diagenesis) during the folding process. Using a Schmidt hammer, I assess the rigidity contrast between the individual units and suggest that late-stage, throughgoing joints formed in strata with conditions similar to those of the present day and that early, bed-contained joints formed when the rigidity contrast between beds was significantly greater than the present day contrast. Modeling algorithms that …
Understanding The Depth And Nature Of Flow Systems In The Nashoba Terrane, Eastern Massachusetts, U.S.A., John P. Diggins
Understanding The Depth And Nature Of Flow Systems In The Nashoba Terrane, Eastern Massachusetts, U.S.A., John P. Diggins
Masters Theses 1911 - February 2014
Igneous and metamorphic rock units have long been considered marginal aquifers yet they are a significant source for potable drinking water in many areas worldwide. Additionally, use of these systems is on the rise due to many factors including, contamination and overuse of surficial systems, as well as expanding population and drought. The Nashoba Terrane is a fault-bounded block of high-grade, steeply dipping metavolcanic and metasedimentary rock located in eastern Massachusetts, U.S.A. The Nashoba is northeast trending, extending from Oxford, MA to the Gulf of Maine south of Newburyport, MA. Seventeen previously drilled wells throughout the Nashoba were selected for …
Three-Dimensionally Preserved Arthropods From The Cambrian (Furongian) Of Quebec And Wisconsin: Systematics, Phylogeny, Ichnology, And Taphonomy, Joseph H. Collette
Three-Dimensionally Preserved Arthropods From The Cambrian (Furongian) Of Quebec And Wisconsin: Systematics, Phylogeny, Ichnology, And Taphonomy, Joseph H. Collette
Masters Theses 1911 - February 2014
Three new types of arthropod from Cambrian intertidal lithofacies of the Elk Mound Group and Lodi Member of Wisconsin, and the Potsdam Group of Quebec are described. These arthropods are preserved ventrally in three dimensions – allowing detailed characterization of morphology. Arenocaris inflata, from the Furongian Elk Mound Group and St. Lawrence Formation, is the earliest occurrence of a phyllocarid. Mosineia macnaughtoni, a large (>10 cm long) euthycarcinoid arthropod, also occurs in Elk Mound strata. Mictomerus melochevillensis represents a new family of early euthycarcinoids, and is a large (8–10+ cm long) arthropod with eleven pairs of homopodous, uniramous limbs. …
Using The Oxidation State Of Iron Plagioclase To Evaluate Magma Oxygen Fugacity: A Micro-Xanes Study, Don Lac
Using The Oxidation State Of Iron Plagioclase To Evaluate Magma Oxygen Fugacity: A Micro-Xanes Study, Don Lac
Masters Theses 1911 - February 2014
No abstract provided.
Environmental Reconstructions From Laminated Lake Sediments, Lake C3, Ellesmere Island, Canadian High Arctic, Kathryn S. Zalzal
Environmental Reconstructions From Laminated Lake Sediments, Lake C3, Ellesmere Island, Canadian High Arctic, Kathryn S. Zalzal
Masters Theses 1911 - February 2014
Sediments in Lake C3, Ellesmere Island, Canada, contain annual laminations, providing a record of sediment accumulation for 1900+ years. Marine sediments are also present at base of cores, recording lake isolation following isostatic rebound of the Taconite Inlet region in the mid-Holocene. Beyond weak correlations with snowfall and summer temperature and precipitation, varve thickness comparisons with instrumental data were largely unsuccessful, likely due to turbidite-induced erosion. However, summer climate conditions are of key importance in varve thicknesses at many Arctic sites and we expect this to be true at Lake C3. Trends in the thickness record also correspond in approximate …
Peary's Explorations, Ray Bradley
Stable Isotopes And Climate Change, Ray Bradley, Rob Snyder
Stable Isotopes And Climate Change, Ray Bradley, Rob Snyder
IPY STEM Polar Connections
The following description of the role of the study of stable isotopes in water and carbon dioxide molecules when constructing a record of Earth’s pattern of climate change is an excerpt from:
Climate Change and Society by Raymond S. Bradley & Norman E. Law (2001) Nelson Thornes, Cheltenham, UK (ISBN: 0 7487 5823 2)
The Arctic Solar Challenge, Rob Snyder
The Arctic Solar Challenge, Rob Snyder
IPY STEM Polar Connections
Design, build, and evaluate the performance of a portable, temporary, passive solar structure that can be used as a shelter for researchers who will be in Kotzebue, Alaska around the time of a summer solstice.
The Antarctic: Going To Extremes, Morton Sternheim
The Antarctic: Going To Extremes, Morton Sternheim
IPY STEM Polar Connections
No abstract provided.
The Problem Of Venice - Sea Level Rise, Ray Bradley
The Problem Of Venice - Sea Level Rise, Ray Bradley
IPY STEM Polar Connections
The problem of Venice ... We are all Venetians now.
Effects Of Anthropogenic Stage Fluctuations On Surface Water/Ground Water Interactions Along The Deerfield River, Massachusetts., Brandon J. Fleming
Effects Of Anthropogenic Stage Fluctuations On Surface Water/Ground Water Interactions Along The Deerfield River, Massachusetts., Brandon J. Fleming
Masters Theses 1911 - February 2014
Understanding the connection of surface waters to ground-water systems is important when evaluating potential water resources. In the past surface waters and ground-water have been viewed as two different sources of water but more commonly now they are viewed as one connected resource (Winter et al, 1998). The nature of connection between surface and ground-waters varies depending on climatic and geologic settings, as well as anthropogenic influences such as ground-water pumping and manipulation of river flows by dams. This thesis takes advantage of daily stage changes in the Deerfield River to investigate surface water interactions with ground-water in Charlemont, MA. …