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Filtering by: Contributor advisor sim Kent, Adam J. R. Remove constraint Contributor advisor sim: Kent, Adam J. R.

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Revisiting Lōʻihi: Geochemistry of Kamaʻehuakanaloa Lavas Reveals Complexities in the Pre-Shield to Shield Transition and Hawaiian Mantle Plume Source

Creator:

Truong, Thi B.

Abstract:

Studies of Hawaiian volcanoes contribute valuable insights about Earth processes and mantle evolution, and are fundamental for understanding the construction of the largest volcanoes on terrestrial planets. The pre-shield stage exists in every Hawaiian volcano, but is usually blanketed by high volume tholeiitic lava flows during the main shield stage....

Resource Type:

Dissertation
Thermochemical Storage Conditions of Caldera Forming Magmatic Systems Revealed by Diffusion Chronometry

Creator:

Lubbers, Jordan E.

Abstract:

Large silicic magmatic systems are responsible for producing the largest explosive volcanic eruptions on earth. These phenomena, although infrequent (i.e., 1 per 100,000 years), impact the global climate, deposit ash over continent sized regions, and significantly alter landscapes. Silicic magmatism also plays important roles in the formation and ongoing evolution...

Resource Type:

Dissertation
Isotopic and Geochemical Signatures of Mantle and Crustal Contributions in Rhyolites from Okataina and Taupo volcanoes, New Zealand

Creator:

Rocco, Nicole D.

Abstract:

Silicic caldera-forming eruptions are some of the largest and most destructive volcanic eruptions known, and present significant local and global hazards. The underlying processes within crustal magma plumbing systems that lead to the accumulation and eruption of large volumes of evolved magma remain enigmatic, yet there is broad consensus that...

Resource Type:

Masters Thesis
Timing and Composition of Volcanism at Harrat Ithnayn, Western Saudi Arabia

Creator:

Alhejji, Suhail

Abstract:

Western Saudi Arabia hosts a number of young volcanic fields, known as “Harrats”. Harrats cover a significant proportion of western Saudi Arabia and are associated with significant volcanic hazards. However, the ultimate cause of volcanic activity remains unclear. Younger volcanism (<12 Ma) is clearly represented by the north-south-trending region known...

Resource Type:

Masters Thesis
Creating a Predictive Model of Cinder Cone Evolution in Central Oregon

Creator:

Das-Toke, Shyam P.

Abstract:

Cinder cones are useful geomorphic features for geological analysis because they generally have known initial states and follow a similar pattern of degradation as they are exposed to erosive processes. This is largely because cinder cones are produced by monogenetic eruptions. Characterizing large cinder cone fields in terms of age...

Resource Type:

Masters Thesis
The Deschutes Formation: evidence of extension-enhanced explosivity in the early High Cascades

Creator:

Pitcher, Bradley W.

Abstract:

The eruptive history of the Quaternary Cascades arc has been relatively well characterized. However, much less is known about the frequency and sizes of explosive eruptions produced by earlier stages of the arc. The Late Neogene Deschutes Formation of Central Oregon preserves a remarkable record of heightened pyroclastic activity during...

Resource Type:

Dissertation
Crystal Records of the Origin, Evolution, and Thermal Histories of Magmas

Creator:

Bradshaw, Richard W., 1985-

Abstract:

In volcanic systems, magma is generally stored in the shallow crust prior to eruption. The conditions of this storage directly impact whether the magma eventually erupts, or crystallizes within the crust to form a pluton. In this dissertation I present four studies that investigate the storage conditions of a number...

Resource Type:

Dissertation
Insights into the Geochemical Evolution of the Youngest Toba Tuff (Sumatra, Indonesia) Magma Chamber Through the Lens of Zircon-hosted Melt Inclusions

Creator:

Lerner, Allan

Abstract:

Supervolcanic eruptions are among the most catastrophic phenomena on Earth, erupting 100s-1000s of cubic kilometers of magma, and producing devastating local effects and global climate perturbations. The largest supervolcanic eruption of the last 28 Ma was the 74 ka Youngest Toba Tuff (YTT) eruption from Sumatra, Indonesia, which erupted 2,800...

Resource Type:

Masters Thesis
Petrology and geochemistry of the Emigrant Pass volcanics, Nevada : implications for a magmatic-hydrothermal origin of the Carlin gold deposits

Creator:

Johnson, Curtis L.

Abstract:

The Emigrant Pass volcanics (EPV) are a 38.3 to 36.4 Ma calc-alkaline volcanic center that erupted andesite and dacite, and a late series of felsic dikes along the south flank of the Carlin gold district in north-central Nevada. The EPV includes dacite and rhyolite porphyry dikes indistinguishable from porphyry dikes...

Resource Type:

Masters Thesis
Controls on eruption style and magma compositions at Mount Hood, Oregon

Creator:

Koleszar, Alison M.

Abstract:

This study is an effort to characterize the magma sources, plumbing system, and eruptive behavior of Mount Hood, a low-explosivity recharge-dominated volcano in the Oregon Cascades. The three manuscripts in this dissertation make use of melt inclusion data, phenocryst compositions, and whole rock petrology and geochemistry to build a schematic...

Resource Type:

Dissertation

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Academic Affiliation

College of Earth, Ocean, and Atmospheric Sciences8
Geosciences5

Advisor

Kent, Adam J. R.13
Dilles, John H.1
Nielsen, Roger L.1

Commencement Year

Commencement Year range begin – Commencement Year range end

Current results range from 2006 to 2023

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Committee Member

Grunder, Anita L.4
Graham, David2
Nielsen, Roger L.2
Tepley, Frank J.2
de Silva, Shanaka2
more Committee Members »

Creator

Alhejji, Suhail1
Bradshaw, Richard W., 1985 1
Darr, Cristina M.1
Das Toke, Shyam P.1
Johnson, Curtis L.1
more Creators »

Date

Date range begin – Date range end

Current results range from 2006 to 2021

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Unknown 1

Decade

2020-20292
2010-20198
2000-20092

Degree Field

Geology13

Degree Level

Doctoral7
Master's6

Degree Name

Doctor of Philosophy (Ph.D.)7
Master of Science (M.S.)6

File Format

application/pdf2

Language

English [eng]13

License

All rights reserved13

Non-Academic Affiliation

Oregon State University. Graduate School8

Peer Reviewed

No13

Resource Type

Dissertation7
Masters Thesis6

Rights Statement

In Copyright12
In Copyright - Non-Commercial Use Permitted1

Subject

Hood, Mount (Or.)2
Magmas -- Oregon -- Hood, Mount2
Basalt -- Inclusions -- Cascade Range1
Basalt -- Inclusions -- Oregon1
Crystals1
more Subjects »

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