Magma Origin and Evolution of White Island (Whakaari) Volcano, Bay of Plenty, New Zealand
White Island is an active composite stratovolcano in the Bay of Plenty, New Zealand, that comprises many small volume (<0·1 km 3 ) andesite–dacite lava flows and pyroclastic deposits with phenocryst contents of ∼15–44%. Minor high-Mg basaltic andesite explosive eruptions, such as those of 1976–19...
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fthighwire:oai:open-archive.highwire.org:petrology:41/6/867 2023-05-15T18:43:34+02:00 Magma Origin and Evolution of White Island (Whakaari) Volcano, Bay of Plenty, New Zealand COLE, J. W. THORDARSON, T. BURT, R. M. 2000-06-01 00:00:00.0 text/html http://petrology.oxfordjournals.org/cgi/content/short/41/6/867 https://doi.org/10.1093/petrology/41.6.867 en eng Oxford University Press http://petrology.oxfordjournals.org/cgi/content/short/41/6/867 http://dx.doi.org/10.1093/petrology/41.6.867 Copyright (C) 2000, Oxford University Press ARTICLES TEXT 2000 fthighwire https://doi.org/10.1093/petrology/41.6.867 2013-05-27T17:07:38Z White Island is an active composite stratovolcano in the Bay of Plenty, New Zealand, that comprises many small volume (<0·1 km 3 ) 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. Text White Island HighWire Press (Stanford University) 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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HighWire Press (Stanford University) |
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English |
topic |
ARTICLES |
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ARTICLES COLE, J. W. THORDARSON, T. BURT, R. M. Magma Origin and Evolution of White Island (Whakaari) Volcano, Bay of Plenty, New Zealand |
topic_facet |
ARTICLES |
description |
White Island is an active composite stratovolcano in the Bay of Plenty, New Zealand, that comprises many small volume (<0·1 km 3 ) 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 |
Text |
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 |
publishDate |
2000 |
url |
http://petrology.oxfordjournals.org/cgi/content/short/41/6/867 https://doi.org/10.1093/petrology/41.6.867 |
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_relation |
http://petrology.oxfordjournals.org/cgi/content/short/41/6/867 http://dx.doi.org/10.1093/petrology/41.6.867 |
op_rights |
Copyright (C) 2000, Oxford University Press |
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 |
_version_ |
1766233986276786176 |