Please use this identifier to cite or link to this item:
http://hdl.handle.net/11375/19303
Title: | Physical Volcanology of a Pyroclastic Flow Rotoiti Breccia Formation, New Zealand |
Authors: | Fawcett, Peter J. |
Advisor: | Clifford, Paul M. |
Department: | Geology |
Keywords: | physical, volcanology, pyroclastic, formation, rotoiti breccia, flow, deposit, eruption, particle |
Publication Date: | Apr-1985 |
Abstract: | <p> The Rotoiti Breccia Formation is a pyroclastic flow deposit located at the northern end of the Taupo volcanic zone, North Island New Zealand. It was formed by a fairly low energy subaerial eruption and subsequent flowage, which restricted it to the topographic low between two older ignimbrites.</p> <p> Samples from proximal, medial and distal areas of the flow were examined to determine changes in grain size and particle type distribution as the flow progressed. It was found that on the whole, the flow was very homogenous. However, some initial turbulence at the very beginning of the flow has produced a bimodal grain size distribution presumably due to increased mechanical breakage. A much more prominant crystal population was found in the distal areas of the flow due to rounding of pumice grains and the elutriation of the resultant fines.</p> |
URI: | http://hdl.handle.net/11375/19303 |
Appears in Collections: | Bachelor theses |
Files in This Item:
File | Description | Size | Format | |
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Fawcett_Peter_J._1985Apr_Bachelors..pdf | 2.15 MB | Adobe PDF | View/Open |
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