At the end of last school year, I had made the decision to switch from Geology M.S. to Geology PSM program. I am still pursuing my masters in geology, but now through the Professional Science Masters (PSM). In the PSM program, two certificates must be completed, the two certificates that I am pursuing are an environmental geology certificate and an engineering geology certificate. I have gained a greater interest in mapping landslides and geotechnical engineering through this program.

The purpose of my research is to constrain the spatial and temporal evolution of the Harney Basin along with providing a better understanding of the tectonic and structural history of the region. Thickness maps of significant stratigraphic units will be modeled using a variety of data including oil and gas wells, water-wells, and potential fields data. The isochore maps will illustrate the depocenter evolution from the late Oligocene to the modern depositional basin.

My masters thesis focuses on understanding the eruptive history of Three Fingered Jack, a mafic composite volcano in the central High Cascades of Oregon. Three Fingered Jack is located 21km south of Mount Jefferson, near the town of Sisters, Oregon. For this study, I have conducted detailed field investigation, collected geochemistry and SEM data, and age dated samples using Ar/Ar geochronology.

The hillslope processes that shape the mountainous terrain of the Pacific Northwest have contributed significant changes to the region’s river systems. In September 2017, a large wildfire burned the mountainous terrain cradling Eagle Creek, a tributary to the Columbia River. Since the fire, Eagle Creek has begun the process of recovery. Previous post-fire research has found that the characteristics of hillslope processes are altered by wildfire but expected to return over time, however stream process responses are less understood. This study looks to quantify the changes and downstream impacts these processes have had on Eagle Creek following the fire.

Thesis Proposal:

Immediately south of Mount Hood, OR, the Twin Lakes fault cuts off several drainage channels, forming a series of basins. The fault's relatively sharp topographic expression suggests earthquakes have ruptured at its surface since the region’s last glacial retreat. The presence of basins imply multiple fault ruptures in recent geologic time, deeming it a potential seismic hazard. My thesis investigates sediment from two of the fault-dammed basins, Lower Twin and Frog Lakes. I aim to determine how recently and how frequently the Twin Lakes fault has ruptured since basin formation, filling a gap in the region’s seismic risk analysis.

Hypervelocity impacts are the most fundamental process in Geology. Throughout the “deep time” of solar system history impacts have played a role in the formation of planets, modification of the surfaces of planetary bodies, and terrestrial mass extinctions. The goal of this Master's thesis project is to reconstruct the impact conditions via a battery of novel electron backscatter diffraction (EBSD) methods and shock thermobarometry of a suite of similarly shocked L-chondrites.

What processes may have formed/controlled the fabrics in ureilites?

Ureilites is a type of meteorite which formed from the disruption of an asteroid. It consists of minerals such as olivine, pigeonite, troilite, and high-pressure carbon phases like graphite and diamond. These meteorites, which are linked to magmatic origins, show signs of shock impact deformation, with their minerals arranged in preferred patterns or orientations called fabrics. However, the mechanisms and processes behind the formation of these fabrics remains uncertain.

My dissertation is focused on using a combined chemical-crystallographic technique (using the EDS and EBSD detectors on the scanning electron microscope) to evaluate the petrogenesis and shock deformation histories of lithic clasts in lunar meteorites. My big picture research goals are to be able to disentangle effects of shock deformation in lunar samples in order to properly evaluate primary chemical signatures obtained during crystallization within the Moon. The three lithic clast lithologies I am investigating are: 1) dunites, 2) spinel-rich rocks, and 3) felsites (granites).

My doctoral work focuses on understanding the chemical evolution of mafic (basalt and basaltic andesite) lavas in the central Oregon High Cascades. My overarching tasks are to 1) describe the distribution of mafic lavas in the Oregon High Cascades, 2) determine why basaltic andesites in particular are so abundant in this part of the Cascades, and 3) examine how the chemistry of individual volcanic centers compare to those in close proximity. I am using a combination of bulk rock geochemistry, new geologic dates, petrography, and eventually isotopes to answer these outstanding questions. 

Titled "Orphan Basalts: Investigating the Petrogenesis of Unassigned Eastern Oregon Basalts," my thesis project is focused on detailing the origins of basalts mapped within the Telephone Butte, Calamity Butte and Craft Point quadrangles located along the boundary between the Harney Basin and the southern foothills of the Blue Mountains Province. Named for the localities in which basalt samples were collected, several basalt units are mapped in each quadrangle. Similarities in geochemical analyses of each basalt unit suggest that although these basalts have different unit names, they are in fact related and likely originated from the same source. 

My research is focused in the central to northern Oregon Cascade Range. In this part of the Cascade Range, erupted lavas are very compositionally restricted as compared to other arc segments. Although the central to northern Oregon Cascade Range does have several large, more andesitic stratovolcanoes, such as Mt. Hood, Mt. Jefferson, and the Middle and South Sister, volcanism is dominated by hundreds of smaller, basaltic volcanoes. Studies of the Cascade Range have acknowledged the prevalence of basaltic volcanism in this portion of the range, but many regional studies have focused on the andesitic centers, leaving most of the basaltic centers unstudied. 

Volcanic eruptions release carbon dioxide (CO2) into the atmosphere, which contributes to the carbon cycle. However, much is still unexplored about how volcanic eruptions affect the movement of organic carbon from vegetation and soil. My thesis focuses on the impact of the 1980 Mount St. Helens eruption on the terrestrial carbon cycle. It examines how the eruption affected carbon storage in vegetation and soils in the affected area. By comparing terrestrial carbon levels before and after the eruption, we aim to establish a carbon budget for the period since 1980. 

Temporal clustering of deep-seated landslides in the Puget Lowlands; a seismic trigger? 

The Puget Lowlands of Washington State is about the most seismically active region in the Pacific Northwest. Paleoseismic records show ample evidence of prehistoric crustal and Cascadia megathrust earthquakes in the region with a temporal cluster of earthquakes in the crustal faults about 1000 years ago. Although multiple paleoseismic records exist for crustal and Cascadia megathrust earthquakes in the area, little is known about the temporal and spatial distribution of earthquake-triggered landslides. To address this, we conducted a comprehensive study applying surface roughness age dating techniques to over 600 landslides in the lower Puget Sound region to explore earthquake-triggered landslides' spatial and temporal patterns. 

Black shales are rocks that are enriched in heavy metals and metalloids. Previous studies have shown that agriculture crops grown on soils formed on black shales pose a health hazard to humans and biota. However, no study has been conducted on the environmental hazard that these outcrops may pose in watersheds with black shale outcrops. I will be studying how these heavy metals are partitioned in streams once released during weathering; heightened knowledge is needed in this area so that state agencies may better protect human and environmental health in areas where metalliferous black shales occur. 

My master’s thesis focuses on understanding magma evolution and eruptive history of Three Fingered Jack, a dissected mafic composite cone volcano in the central High Cascades of Oregon. This region is characterized by intra-arc extension, creating an extensive mafic platform dominated by dozens of small scoria cones and voluminous mafic flows of basaltic and basaltic andesitic composition. It has the largest concentration of mafic monogenetic volcanoes in the entire Cascade arc, some of which have erupted in the past 2,500 years. Three Fingered Jack is much larger compared to its neighboring scoria cones.

My research is focused on understanding shock deformation in shergottites, the most commonly sampled Martian meteorites. My goals are to estimate deformation intensities in shergottites, identify the number of asteroid impact events they have undergone, and develop additional deformation estimation criteria based on changes in the crystal structure of key minerals such as olivine and pyroxene. Understanding the shock deformation in shergottites (and, by extension, all Martian meteorites) will allow for an unbiased interpretation of primary features that can reveal a lot about the geologic processes that shaped Mars.

Vogt Scholar Rachel Sweeten reports: “This year we were able to successfully locate another ~30 dikes as well as a potential layered mafic intrusion exposure (middle photo) with an inferred 600 cubic km volume. Lab work will continue this fall and winter in the form of clinopyroxene thermobarometry (to determine storage depth) as well as the full suite of XRF [X-ray fluorescence] and ICPMS [Inductively Coupled Plasma Mass Spectrometry] analysis of all new samples.” Photo on right is of field assistant Heather Ziff next to a large boulder of the upper portion of the layered intrusion that fell to the bottom of the slope as a result of a rockfall.

Vogt Scholar Daniel Sheikh reports: “I recently had the opportunity to present some of my research at the 85th Annual Meeting of the Meteoritical Society, held in Glasgow in August. In this talk, I presented on a unique dunite clast (photo left) found within one of my lunar meteorite samples for research, and implications on how it likely formed. This is a component of the larger research focus that I am involved in, which is to constrain the range of lunar lithologies found in lithic clasts from lunar meteorites and to characterize the degree of shock deformation imposed on each of them.”

Vogt Scholar Darlene Gilroy reports: “I am currently in the picking stage of lab work. In this stage, I am using a microscope to look at crushed scoria and “pick” out specific grains of olivine. The scoria is from the Boring Volcanic Mt. Tabor. After finishing the Mount Tabor samples I will move on to my other sample sites, also Boring Volcanic: Prune Hill, Mount Scott, and Battle Ground Lake. The olivine grains will be mounted in epoxy and sent off for electron microprobe and Fourier-transform infrared spectroscopy to establish the rate of ascent and storage depth of magma for the Boring volcanics. I recently sent samples from all four locations to WSU for bulk geochemical analysis.”
(Photo left: Darlene and retired DOGAMI geologist/GSOCer Ian Madin at her Mt. Tabor field site reconning for our 2023 Boring Buttes field trip. Photo right: view under a microscope showing olivine which are the “amber colored” grains among the darker scoria. )

Vogt Scholar Julian Cohen reports: “I completed my field work over 11 days at the end of August and collected around 30 glass samples from various places all over central and eastern Oregon. Since then, I’ve been working to prepare them for mass spectrometry analysis by crushing, sieving, and cleaning the glass shards. Photo (left) is of some relatively “clean” glass, meaning there aren’t a lot of surface precipitates on it that might impact the analysis. I’ll have to run many samples through a series of acid washes to clean the shards to insure there isn’t contamination! I’ll be at the University of Texas Austin in December to do my analyses.”

GSOC is pleased to announce our 2022 PSU Beverly Vogt grant awardees! Each applicant was awarded $1,000 to be used toward the achievement of their degree. Each awardee has expressed gratitude to GSOC members for this financial support toward their research goals. Once they complete their research, we plan to have each of them share their findings with GSOC through a Friday Night lecture and/or a Saturday Zoom meetup session.

Read more about the candidates’ thesis projects…

Note: Our three Master’s candidates have expressed interest in having GSOC members assist them in their fieldwork. We are currently working with them to find out dates and what their needs will be. If you are interested in providing some assistance in the field, please contact a GSOC board member or email the PSU Bev Vogt committee members at: gsocfundforpsu@gsoc.org

Fund will provides financial support to PSU graduate Geoscience students to assist them in completing their degree programs. Applications will open again in Winter 2023.

To honor former President Beverly Vogt and create a legacy for her work and that of the society, the GSOC Board of Directors created the Beverly Vogt PSU Graduate Student Fund. The Board formed a new committee to make recommendations as to the administration of this fund. The Vogt committee arranges for PSU grad students to present their projects and proposals, not only related to scholarships, but also in the interest of strengthening the 70-year+ relationship between GSOC and the PSU Geology Department.