Multiple rhyolite magmas and basalt injection in the 17.7 ka Rerewhakaaitu eruption episode from Tarawera volcanic complex, New Zealand

Shane, Phil; Martin, Shannon B.; Smith, Vicki; Beggs, K.F.; Darragh, Miles; Cole, Jim; Nairn, I. A.

doi:10.1016/j.jvolgeores.2007.04.003

Cited by 87 publications

(97 citation statements)

References 47 publications

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“…These are deeper than those calculated from Oruanui melt inclusions (4-6.5 km: Liu et al 2006), but corresponds to estimates for depths of the Oruanui mush body from amphibole barometry ) and low resistivity zones, interpreted as partially molten bodies, in an area north of Taupo (Heise et al 2010). Similar depths for intermediate composition mush zones are also reported for Okataina volcanic centre in the TVZ (Shane et al 2007(Shane et al , 2008Smith et al 2010;Cole et al 2014). Rim compositions of Taupo dacite plagioclase (~An 60 ) are consistent with experimental studies of plagioclase in similar composition melts at P H 2 O >180 MPa at 900 °C, a melt fraction of ~0.8 and 5.5 wt% H 2 O (Fig.…”

Section: Origin and Significance Of The ~21-17 Ka Dacitessupporting

confidence: 85%

Fine-scale temporal recovery, reconstruction and evolution of a post-supereruption magmatic system

Barker

Wilson

Allan

et al. 2015

Contrib Mineral Petrol

214

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eruption of 25 rhyolitic units starting at ~12 ka. The dacites show strongly zoned minerals and wide variations in meltinclusion compositions, consistent with early magma mixing followed by periods of cooling and crystallisation at depths of >8 km, overlapping spatially with the inferred basal parts of the older Oruanui silicic mush system. The dacites reflect the first products of a new silicic system, as most of the Oruanui magmatic root zone was significantly modified in composition or effectively destroyed by influxes of hot mafic magmas following caldera collapse. The first rhyolites erupted between 12 and 10 ka formed through shallow (4-5 km depth) cooling and fractionation of melts from a source similar in composition to that generating the earlier dacites, with overlapping compositions for melt inclusions and crystal cores between the two magma types. For the successively younger rhyolite units, temporal changes in melt chemistry and mineral phase stability are observed, which reflect the development, stabilisation and maturation of a new, probably unitary, silicic mush system. This new mush system was closely linked to, and sometimes physically interacted with, underlying mafic melts of similar composition to those involved in the Oruanui supereruption. From the inferred depths of magma storage and geographical extent of vent sites, we consider that a large silicic mush system (>200 km 3 and possibly up to 1000 km 3 in volume) is now established at Taupo and is capable of feeding a new episode or cycle of volcanism at any stage in the future.

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Section: Origin and Significance Of The ~21-17 Ka Dacitessupporting

confidence: 85%

Fine-scale temporal recovery, reconstruction and evolution of a post-supereruption magmatic system

Barker

Wilson

Allan

et al. 2015

Contrib Mineral Petrol

214

View full text Add to dashboard Cite

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“…There is evidence of basalt erupted during each of these rhyolite episodes (Nairn, 1992(Nairn, , 2002Darragh et al, 2006;Shane et al, 2007) and it is believed that injections of basaltic magma played a key role in triggering the rhyolitic eruptions (Villamor et al, 2007;Leonard et al, 2002). Basalts predating the 1886 eruption (Nairn, 1979;Nairn and Cole, 1981) have been mapped along the South and North shore of Lake Rotomahana (Fig.2).…”

Section: Geological and Geothermal Settingmentioning

confidence: 99%

Interpretation of gravity and magnetic anomalies at Lake Rotomahana: Geological and hydrothermal implications

Tontini

Ronde

Scott

et al. 2016

Journal of Volcanology and Geothermal Research

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“…There have been cases in which the intrusion of mafic magma into a more silicic chamber triggered the explosive eruption, by producing the heating of the silicic magma and the exsolution of volatiles. This, in turn, would increase the pressure in the relatively shallow magmatic chamber and provide the energy required for the eruption (Kuritani, 2001;Kennet and Eichelberg, 1997;Snyder, 2000;Leonard et al, 2002;Shane et al, 2007). Also, the release of volatiles from the dehydration of amphibole and biotite can produce the vesiculation of the magma and the subsequent eruption (Tepley III et al, 1999).…”

Section: Evidence Of Magma Mixing and Minglingmentioning

confidence: 99%

Volcanic stratigraphy and evidence of magma mixing in the Quaternary Payun Matru volcano, andean backarc in western Argentina

Hernando¹,

Llambías²,

González³

et al. 2012

Andgeo

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AbStRAct. The Payún Matrú Volcanic Field is located in the Payenia Basaltic Province of the recent back-arc of western Argentina (35°S-38°S). This province is younger than 5 Ma, and most of its volcanic activity took place since 2 Ma. The Payún Matrú Volcanic Field contains two composite volcanoes, Payún Matrú and Payún Liso, and two basaltic fields in an E-W oriented zone, located east and west of the Payún Matrú volcano. Payún Matrú is the largest volcano of this volcanic field, and consists of a shield-shaped edifice with a circular summit caldera of 8 km in diameter. The composition of both composite volcanoes is alkaline and predominantly trachytic, having also minor intermediate lavas.The basaltic fields consist of basalts and trachybasalts, with clinopyroxene and abundant olivine as phenocrysts and also in the groundmass. Textures indicating mixing and mingling processes, such as dusty plagioclases along with clear ones, biotite replaced by anhydrous minerals and two groundmasses with a fluid-fluid relationship, are common in the early pre-caldera stage of Payún Matrú and some post-caldera lavas. The latest post-caldera lavas are trachytic, with clean sanidine phenocrysts without disequilibrium textures. A remarkable characteristic of the Payún Matrú Volcanic Field is the fact that the Payún Matrú caldera is surrounded by basaltic fields at its base, while no basalts were erupted in the caldera region. We propose that the absence of basaltic lavas in the Payún Matrú volcano is due to the presence of a magmatic chamber below it, and that the mafic magmas rising from deeper levels were unable to erupt without interaction with more evolved melts. Intermediate hybrid magmas produced as a consequence of magma mixing and mingling between basaltic and trachytic magmas, are present in the early and mid-history of Payún Matrú volcano. We present here new information about the Quaternary Payún Matrú Volcanic Field derived from field work, petrography, and major element geochemistry and 87 Sr/ 86 Sr isotopic ratios. For the first time a detailed map of the Payún Matrú Volcanic Field and its volcanic stratigraphy, primarily based on field observations, are presented. RESuMEn. Estratigrafía volcánica y evidencia de mezcla de magmas en el volcán Payún Matrú del cuaternario, en el retroarco andino de Argentina occidental. El Campo Volcánico Payún Matrú está localizado en la Provincia Basáltica Payenia, en el retroarco reciente al oeste de Argentina (35°S-38°S). Esta provincia es más joven que 5 Ma, y la mayor parte de su actividad volcánica tuvo lugar desde hace 2 Ma. El Campo Volcánico Payún Matrú contiene dos volcanes compuestos, el Payún Matrú y el Payún Liso, así como dos campos basálticos en una franja E-W, ubicados al este y oeste del Payún Matrú. El Payún Matrú es el volcán más grande de este campo volcánico, y consiste en un edificio en forma de escudo con una caldera circular en su cúspide de 8 km de diámetro. La composición de ambos volcanes compuestos es alcalina y predominantemente traquítica, con menor...

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Multiple rhyolite magmas and basalt injection in the 17.7 ka Rerewhakaaitu eruption episode from Tarawera volcanic complex, New Zealand

Cited by 87 publications

References 47 publications

Fine-scale temporal recovery, reconstruction and evolution of a post-supereruption magmatic system

Fine-scale temporal recovery, reconstruction and evolution of a post-supereruption magmatic system

Interpretation of gravity and magnetic anomalies at Lake Rotomahana: Geological and hydrothermal implications

Volcanic stratigraphy and evidence of magma mixing in the Quaternary Payun Matru volcano, andean backarc in western Argentina

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