Magma Origin and Evolution of White Island (Whakaari) Volcano, Bay of Plenty, New Zealand
Abstract White Island is an active composite stratovolcano in the Bay of Plenty, New Zealand, that comprises many small volume (<0·1 km3) andesite–dacite lava flows and pyroclastic deposits with phenocryst contents of ∼15–44%. Minor high-Mg basaltic andesite explosive eruptions, such as those...
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croxfordunivpr:10.1093/petrology/41.6.867 2024-02-11T10:09:22+01:00 Magma Origin and Evolution of White Island (Whakaari) Volcano, Bay of Plenty, New Zealand COLE, J. W. THORDARSON, T. BURT, R. M. 2000 http://dx.doi.org/10.1093/petrology/41.6.867 https://academic.oup.com/petrology/article-pdf/41/6/867/45629732/petrology_41_6_867.pdf en eng Oxford University Press (OUP) Journal of Petrology volume 41, issue 6, page 867-895 ISSN 1460-2415 0022-3530 Geochemistry and Petrology Geophysics journal-article 2000 croxfordunivpr https://doi.org/10.1093/petrology/41.6.867 2024-01-12T09:44:42Z Abstract White Island is an active composite stratovolcano in the Bay of Plenty, New Zealand, that comprises many small volume (<0·1 km3) andesite–dacite lava flows and pyroclastic deposits with phenocryst contents of ∼15–44%. Minor high-Mg basaltic andesite explosive eruptions, such as those of 1976–1992, may have occurred at intervals throughout the history of White Island, but are rarely preserved. These alternate with major episodes of andesite–dacite lava extrusion. The high-Mg magmas form by hydrous melting of mantle, metasomatized by fluids from the dehydrating slab at the slab–mantle wedge interface, that rise rapidly to shallow magma chambers (2–7 km?) where limited mixing and contamination occurs before eruption. Some of this magma remains in the magma chamber where it interacts with the crystal mush, from which it inherits phenocrysts, to form so-called ‘dirty’ lavas. Total phenocryst content of these lavas is correspondingly higher. As more magma is intruded into the chamber, the heat flux will increase and melt fraction will eventually rise to the surface to form high-silica andesite–dacite magma (‘clean’ lavas) with fewer inherited phenocrysts. Similar multi-magma chamber plumbing systems, with complex evolution involving fractionation and contamination, probably occur in most andesite–dacite arc volcanoes. Article in Journal/Newspaper White Island Oxford University Press Bay of Plenty ENVELOPE(-128.761,-128.761,52.837,52.837) New Zealand White Island ENVELOPE(48.583,48.583,-66.733,-66.733) Journal of Petrology 41 6 867 895 |
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Oxford University Press |
op_collection_id |
croxfordunivpr |
language |
English |
topic |
Geochemistry and Petrology Geophysics |
spellingShingle |
Geochemistry and Petrology Geophysics COLE, J. W. THORDARSON, T. BURT, R. M. Magma Origin and Evolution of White Island (Whakaari) Volcano, Bay of Plenty, New Zealand |
topic_facet |
Geochemistry and Petrology Geophysics |
description |
Abstract White Island is an active composite stratovolcano in the Bay of Plenty, New Zealand, that comprises many small volume (<0·1 km3) andesite–dacite lava flows and pyroclastic deposits with phenocryst contents of ∼15–44%. Minor high-Mg basaltic andesite explosive eruptions, such as those of 1976–1992, may have occurred at intervals throughout the history of White Island, but are rarely preserved. These alternate with major episodes of andesite–dacite lava extrusion. The high-Mg magmas form by hydrous melting of mantle, metasomatized by fluids from the dehydrating slab at the slab–mantle wedge interface, that rise rapidly to shallow magma chambers (2–7 km?) where limited mixing and contamination occurs before eruption. Some of this magma remains in the magma chamber where it interacts with the crystal mush, from which it inherits phenocrysts, to form so-called ‘dirty’ lavas. Total phenocryst content of these lavas is correspondingly higher. As more magma is intruded into the chamber, the heat flux will increase and melt fraction will eventually rise to the surface to form high-silica andesite–dacite magma (‘clean’ lavas) with fewer inherited phenocrysts. Similar multi-magma chamber plumbing systems, with complex evolution involving fractionation and contamination, probably occur in most andesite–dacite arc volcanoes. |
format |
Article in Journal/Newspaper |
author |
COLE, J. W. THORDARSON, T. BURT, R. M. |
author_facet |
COLE, J. W. THORDARSON, T. BURT, R. M. |
author_sort |
COLE, J. W. |
title |
Magma Origin and Evolution of White Island (Whakaari) Volcano, Bay of Plenty, New Zealand |
title_short |
Magma Origin and Evolution of White Island (Whakaari) Volcano, Bay of Plenty, New Zealand |
title_full |
Magma Origin and Evolution of White Island (Whakaari) Volcano, Bay of Plenty, New Zealand |
title_fullStr |
Magma Origin and Evolution of White Island (Whakaari) Volcano, Bay of Plenty, New Zealand |
title_full_unstemmed |
Magma Origin and Evolution of White Island (Whakaari) Volcano, Bay of Plenty, New Zealand |
title_sort |
magma origin and evolution of white island (whakaari) volcano, bay of plenty, new zealand |
publisher |
Oxford University Press (OUP) |
publishDate |
2000 |
url |
http://dx.doi.org/10.1093/petrology/41.6.867 https://academic.oup.com/petrology/article-pdf/41/6/867/45629732/petrology_41_6_867.pdf |
long_lat |
ENVELOPE(-128.761,-128.761,52.837,52.837) ENVELOPE(48.583,48.583,-66.733,-66.733) |
geographic |
Bay of Plenty New Zealand White Island |
geographic_facet |
Bay of Plenty New Zealand White Island |
genre |
White Island |
genre_facet |
White Island |
op_source |
Journal of Petrology volume 41, issue 6, page 867-895 ISSN 1460-2415 0022-3530 |
op_doi |
https://doi.org/10.1093/petrology/41.6.867 |
container_title |
Journal of Petrology |
container_volume |
41 |
container_issue |
6 |
container_start_page |
867 |
op_container_end_page |
895 |
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1790609260882690048 |