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Articles 1 - 8 of 8
Full-Text Articles in Geology
A Community-Level Investigation Of Heavy Metal Pollution In Street Sediments From Terre Haute, Indiana, Kyra Copp '25, Kenneth Brown, Nora Bedwell '26, Camden Brown '25
A Community-Level Investigation Of Heavy Metal Pollution In Street Sediments From Terre Haute, Indiana, Kyra Copp '25, Kenneth Brown, Nora Bedwell '26, Camden Brown '25
Annual Student Research Poster Session
Urban environments contain environmental legacy issues that can have long-term negative public health consequences. Investigating these legacy issues can help constrain potential sources and their impact on communities. This study focuses on street sediment found in Terre Haute, Indiana, a city with an extensive history of coal-fired power production, high-traffic volumes, steel manufacturing, and Pb-based paint usage. This research specifically focuses on Terre Haute’s Sheridan Park community. Six bulk street sediment samples were analyzed by pXRF at DePauw University. This analysis revealed elevated concentrations of Pb (22-152 ppm), As (8-15 ppm), Cu (35-237 ppm), and Zn (149-634 ppm) in all …
Evaluating Our Reliance On Rare Earth Minerals And Platinum Group Metals Over The Period Of 2012 To 2021, Ryan Smith
Evaluating Our Reliance On Rare Earth Minerals And Platinum Group Metals Over The Period Of 2012 To 2021, Ryan Smith
Fall Showcase for Research and Creative Inquiry
Rare Earth Elements (REE’s) are minerals used in our everyday lives. They can be found in our household appliances, phones, computers, cars, as part of wind turbines and solar panels. The US relies on imports of these rare earths from several other countries (e.g. China, Estonia, Malaysia, and Japan) as we cannot mine a majority of the minerals (e.g. cerium, lanthanum, europium, etc) domestically. Since the year 2012, the US has imported approximately 3,000 metric tons of rare earths, and in recent years, this number significantly increased. As of 2021, the US now imports approximately 43,000 metric tons of rare …
A Paleoseismic Study Of The Twin Lakes Fault, Mount Hood Fault Zone, Oregon, Charlie Carr, Ashley R. Streig
A Paleoseismic Study Of The Twin Lakes Fault, Mount Hood Fault Zone, Oregon, Charlie Carr, Ashley R. Streig
McNair Symposium
Recent geologic mapping on high-resolution topography from lidar has led to the discovery of a zone of active faults on Mount Hood. The Mt. Hood Fault Zone consists of four separate faults, and stretches ~55 km from south to north, and crosses the summit of Mount Hood. The focus of this study is the northern section of Twin Lakes Fault, which lies directly south of Mount Hood and adjacent to OR35 and the White River. Lidar topography reveals the west side down normal displacement on the Twin Lakes fault. The highest tectonic seismicity rates in the Mount Hood area occur …
Field Relations, Geochemistry, And Geochronology Of The Rocks At Perkins Point, Castine, Maine, Robert Knowles, Douglas Reusch
Field Relations, Geochemistry, And Geochronology Of The Rocks At Perkins Point, Castine, Maine, Robert Knowles, Douglas Reusch
Individual Projects
Northwest of Castine, Maine is the coastline known as Perkins Point, which is home to about 500 meters of bedrock exposure. Previous mapping projects of Penobscot Bay indicate a discrepancy in rock type for this area, and therefore the origin of the rocks is unclear. Preliminary observations suggest that these rocks are mostly volcanic. The goal of this project is to determine the field relations, geochronology, and geochemistry to conclude the true nature of these rocks and ultimately create a geological map.
Fire-Induced Mineralogical Changes In Midwest Tallgrass Prairie Soils, Lacey Legrand
Fire-Induced Mineralogical Changes In Midwest Tallgrass Prairie Soils, Lacey Legrand
UNO Student Research and Creative Activity Fair
Tallgrass prairies are productive ecosystems that historically covered a large part of the Midwest and in the past were subjected to frequent, natural fire regimes. Today prairie remnants are often managed by ecological burns. Glacier Creek Preserve is a restored prairie in Omaha, Nebraska that includes randomized research plots established in 1978 to study the effects of burning on vegetation and provides a controlled field environment to investigate the effects of fire on soils. The purpose of this study is to compare soil mineralogy in long-term burned and unburned plots to answer the question: “Does prescribed burning induce mineralogical changes …
Org Or Inorg? Atmospheric Carbon Controls That Initiated The Late Paleozoic Ice Age 326mya, Paco Defrancis
Org Or Inorg? Atmospheric Carbon Controls That Initiated The Late Paleozoic Ice Age 326mya, Paco Defrancis
CLAS: Colby Liberal Arts Symposium
The Late Paleozoic Ice Age (LPIA) was a major global icehouse that initiated in the Mississippian (326 million years ago; ma) and lasted through the Early Permian (267ma). An ice sheet nucleated in southern Gondwana near the South Pole, which either paleogeography (positioning of paleocontinents) or atmospheric concentration of the greenhouse gas CO2 controlled. In this paper I accept recent findings that prove atmospheric pCO2 and not paleogeography forced global cooling that resulted in the nucleation of Gondwanan ice sheets that defined the LPIA. There remains no broad consensus of what caused pCO2 lowering in the Mississippian. Organic carbon found …
From The Depths Of Great Pond (Maine): Anthropogenic And Natural Influences On Bottom Sediments And The Implications For Local Sustainability, Sara George, Clara Bicher
From The Depths Of Great Pond (Maine): Anthropogenic And Natural Influences On Bottom Sediments And The Implications For Local Sustainability, Sara George, Clara Bicher
CLAS: Colby Liberal Arts Symposium
As part of a Maine EPSCoR grant focusing on sustainability in the Belgrade Lakes watershed of central Maine, current research consists of collecting bottom sediment samples from Great Pond. Samples were analyzed to create a sediment map of the lake basin in regards to depth, grain-size distribution, organic content (%C), C:N ratios and phosphorus concentration. Results will aid in the understanding of the glacial formation of the lake, distribution of sediment within, and human impact on the lake. Additionally, knowing the distribution of phosphorus within the sediments may allow development of a strategy to avoid accelerated eutrophication. This research will …
My Pet Mineral: Augite, Jacob Wall
My Pet Mineral: Augite, Jacob Wall
CLAS: Colby Liberal Arts Symposium
Augite is typically known for its greenish black color, nice vitreous luster, two directions of cleavage and of course its simple chemical formula: (Ca,Na,Mg,Fe2+,Fe3+Al,Ti)2[(Si,Al)2]O6]. Augite has a hardness of 5.5, 2 planes of cleavage and massive habit. Augite is an important rock-forming silicate mineral and occurs in a wide variety of basic igneous rocks, including gabbros, dolerites and basalts. Augite also occurs in ultrabasic and intermediate rocks as well as a limited number of high-grade metamorphic rocks such as granulites and charnockites. Augites range widely in composition and show a continuoius variation in chemical composition. Iron rich augites are restricted …