| Abstract: | Mayor Island is a Holocene pantelleritic volcano showing a wide range of dispersive power and eruptive intensity despite a very limited range in magma composition of only 2% SiO2. The primary controls on this range appear to have been the magmatic gas content on eruption and a varying involvement of basaltic magma, rather than major-element chemistry of the rhyolites. The ca. 130 ka subaerial history of the volcano contains portions of three geochemical cycles with abrupt changes in trace-element chemistry following episodes of caldera collapse. The uniform major-element chemistry of the magma may relate to a fine balance between rates of eruption and supply and the higher density of the more evolved (Ferich) magmas which could be tapped only after caldera-forming events had removed significant volumes of less evolved but lighter magma. ?? 1992. |
| Genre: | Article |
| ProdID: | 70017171 |
| Citation Author: | Houghton, B. F.; Weaver, S. D.; Wilson, C. J. N.; Lanphere, M. A. |
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| Citation End Page: | 236 |
| Citation Issue: | 3 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Volcanology and Geothermal Research |
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| Citation Number Of Pages: | 20 |
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| Citation Search Results Text: | Evolution of a Quaternary peralkaline volcano: Mayor Island, New Zealand; 1992; Article; Journal; Journal of Volcanology and Geothermal Research; Houghton, B. F.; Weaver, S. D.; Wilson, C. J. N.; Lanphere, M. A. |
| Citation Start Page: | 217 |
| Citation Volume: | 51 |
| Citation Year: | 1992 |
| Type: | citation/reference |
| Text: | Evolution of a Quaternary peralkaline volcano: Mayor Island, New Zealand; 1992; Article; Journal; Journal of Volcanology and Geothermal Research; Houghton, B. F.; Weaver, S. D.; Wilson, C. J. N.; Lanphere, M. A. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Wed, 1 Jan 1992 00:00 -0600 |
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