Show simple item record

dc.contributor.advisorWhite, James
dc.contributor.advisorOrt, Michael
dc.contributor.authorRe, Giuseppe
dc.date.available2017-06-11T21:30:28Z
dc.date.copyright2017
dc.identifier.citationRe, G. (2017). Evolution and dynamics of a monogenetic volcanic complex in the southern Hopi Buttes Volcanic Field (AZ, US): magma diversion and fragmentation processes at the Jagged Rocks Complex (Thesis, Doctor of Philosophy). University of Otago. Retrieved from http://hdl.handle.net/10523/7358en
dc.identifier.urihttp://hdl.handle.net/10523/7358
dc.description.abstractMany populated areas in the world (e.g., Flagstaff, AZ; Auckland, NZ; Mexico City, MEX) lie within active monogenetic volcanic fields that typically contain small volcanic cones and explosive maar craters formed over the course of a single eruptive cycle. Although much work has focused on the eruptive behaviour of monogenetic volcanoes, little geological information exists about their subsurface development and how the movement of magma through Earth’s shallow crust modulates the location and style of hazardous volcanic eruptions. Determination of the dynamics of magma intrusion and the transition from a coherent magma's ascent to its explosive fragmentation is crucial to our understanding of the controls on explosive versus effusive eruptive behaviour, thus to better evaluation of risks in a certain area. This study aims to determine the processes and relative timing of activity that took place below the ground surface of the deeply-eroded but well-preserved Jagged Rocks Complex, a cluster of monogenetic volcanoes within the Miocene Hopi Buttes Volcanic Field in northeastern Arizona, by combining detailed structural mapping, volcanological observation, paleomagnetic and geochemical analysis. The Jagged Rocks Complex, exposed at ~ 350 m below the pre-eruptive surface, comprises a well-preserved intrusive network, including dikes, sills and inclined sheets, associated with different type of fragmental bodies including buds, pyroclastic massifs and a diatreme, that represent different extents of shallow-depth fragmentation. These exposures at the Jagged Rocks Complex provide an excellent natural laboratory for examining the subsurface record of volcano initiation, and for constraining interpretations of processes controlling upward migration of magma from intrusion to eruption. This multidisciplinary approach allows an investigation at different levels from the source region to the surface, and aims to shed the light on the processes that regulate eruptions not only within monogenetic volcanic fields but also within small basaltic volcanoes in general.en_NZ
dc.format.mimetypeapplication/pdf
dc.format.mimetypeimage/jpeg
dc.format.mimetypeimage/jpeg
dc.format.mimetypeapplication/zip
dc.format.mimetypeapplication/octet-stream
dc.format.mimetypeapplication/vnd.openxmlformats-officedocument.spreadsheetml.sheet
dc.format.mimetypeapplication/vnd.openxmlformats-officedocument.spreadsheetml.sheet
dc.format.mimetypeapplication/octet-stream
dc.language.isoenen_NZ
dc.publisherUniversity of Otago
dc.rightsAll items in OUR Archive are provided for private study and research purposes and are protected by copyright with all rights reserved unless otherwise indicated.
dc.subjectConduiten_NZ
dc.subjectDikeen_NZ
dc.subjectFeederen_NZ
dc.subjectDiatremeen_NZ
dc.subjectBasalticen_NZ
dc.subjectMonogenetic volcanoen_NZ
dc.subjectHopi Buttesen_NZ
dc.titleEvolution and dynamics of a monogenetic volcanic complex in the southern Hopi Buttes Volcanic Field (AZ, US): magma diversion and fragmentation processes at the Jagged Rocks Complexen_NZ
dc.typeThesis
dc.date.updated2017-06-10T10:20:02Z
dc.language.rfc3066en
thesis.degree.disciplineGeologyen_NZ
thesis.degree.nameDoctor of Philosophyen_NZ
thesis.degree.grantorUniversity of Otago
thesis.degree.levelDoctoral
otago.openaccessOpenen_NZ
 Find in your library

Files in this item

Thumbnail
Thumbnail
Thumbnail
Thumbnail
Thumbnail
Thumbnail
Thumbnail
Thumbnail

This item appears in the following Collection(s)

Show simple item record