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Full-Text Articles in Geology
A Targeted Investigation Of The Upper Contact Unit Of The Sudbury Igneous Complex In The North Range, Sudbury Impact Structure, Canada, Lindsay E. Debono
A Targeted Investigation Of The Upper Contact Unit Of The Sudbury Igneous Complex In The North Range, Sudbury Impact Structure, Canada, Lindsay E. Debono
Electronic Thesis and Dissertation Repository
The Sudbury Igneous Complex (SIC) represents the remnant of a crystalline impact melt sheet of the Sudbury impact structure; and is historically and presently a strategic exploration target sustaining the region's prolific mining camp. In order to better understand the SIC, it is critical to investigate the chilled upper contact of the SIC, which has historically received little recognition. Through field observations, whole rock geochemistry, petrography, and electron microprobe analysis, this study concludes that the SIC upper contact is in fact extensive across the North Range of the SIC. Additionally, the geochemistry of the SIC units, offset dykes, and upper …
An Investigation Of Hydrothermal Veins Along The Foy Offset Dyke, Sudbury Impact Structure, Ontario, Sarah Ann Codyre
An Investigation Of Hydrothermal Veins Along The Foy Offset Dyke, Sudbury Impact Structure, Ontario, Sarah Ann Codyre
Electronic Thesis and Dissertation Repository
A multi-stage hydrothermal system is related to the 1.85 Ga Sudbury impact structure. This system began in the Sudbury Igneous Complex (SIC) and radiated outward along the offset dykes. Through the combination of orientation measurements of veins in the field, petrography and geochemistry of these veins, this study has determined that there are four types of hydrothermal epidote-quartz veins categorized by their orientation, petrography and geochemistry. This study discovered that there are general trends with increasing distance from the SIC along the Foy Offset Dyke. From this it can be concluded that this is in fact SIC-driven hydrothermal event not …
Constraining The Formation And Alteration Of Sudbury Breccia, Ontario, Canada: Implications For Footwall Cu-Ni-Pge Exploration, Jonathan W. O'Callaghan
Constraining The Formation And Alteration Of Sudbury Breccia, Ontario, Canada: Implications For Footwall Cu-Ni-Pge Exploration, Jonathan W. O'Callaghan
Electronic Thesis and Dissertation Repository
Sudbury breccia is an impactite situated in the footwall of the 1.85 Ga Sudbury impact structure, situated in Ontario. Developing exploration vectors towards Sudbury breccia-hosted Cu-Ni-PGE mineralization is inhibited by an insufficient understanding of the relative contributions of footwall lithologies versus impact melt. By combining whole-rock geochemistry, field observations, statistical modelling and petrography, this study has determined that Sudbury breccia is a parautochthonous shock melt, which does not require a melt sheet contribution. Furthermore, the trace metal content of the breccia is largely controlled by the assimilation of mafic footwall lithologies, the exception being breccia proximal to mineralization, where a …
New Mineralogical And Geochemical Characterization Of Martian Meteorites: Implications For Habitability And Astrobiological Exploration Of Mars, Jared N. Shivak
New Mineralogical And Geochemical Characterization Of Martian Meteorites: Implications For Habitability And Astrobiological Exploration Of Mars, Jared N. Shivak
Electronic Thesis and Dissertation Repository
Mars is thought to have shared many similarities with the Earth during its history, leading to extensive research into the potential for life to arise on Mars. Here, a thorough mineralogical and geochemical characterization of primary and secondary phases in Martian meteorites Los Angeles, Zagami, and Nakhla was performed. This novel approach assesses their potential to host life and build on previous studies that focused on either astrobiological or geological factors. These meteorites were found to contain abundant iron-rich phases that can act as microbial substrates. Investigation of alteration phases in Nakhla allowed for the identification of a new secondary …
A Multispectral Assessment Of Complex Impact Craters On The Lunar Farside, Bhairavi Shankar
A Multispectral Assessment Of Complex Impact Craters On The Lunar Farside, Bhairavi Shankar
Electronic Thesis and Dissertation Repository
Hypervelocity collisions of asteroids onto planetary bodies have catastrophic effects on the target rocks through the process of shock metamorphism. The resulting features, impact craters, are circular depressions with a sharp rim surrounded by an ejecta blanket of variably shocked rocks. With increasing impact energy, the inner crater cavity can preserve complex morphologies including terraced walls, central uplifts, and melted rocks. The lack of erosion due to the absence of water or an atmosphere makes the Moon the perfect target to study impact crater processes, in particular the distribution of highly shocked materials within impact craters of different sizes. …