An outline geochemistry of rhyolite eruptives from Taupo volcanic centre, New Zealand

Sutton, Andrew N.; Blake, Stephen; Wilson, C. J. N.

doi:10.1016/0377-0273(95)00011-i

Cited by 124 publications

(193 citation statements)

References 33 publications

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“…Taupo is a large (~30 cm) pumice clast originating from the 1.8 ka Plinian eruption of the Taupo caldera [41][42][43][44] on the North Island of New Zealand. A single pumice clast was utilized from this eruption due to the chemical homogeneity of the magma [45,46] and low crystal content [44]. The three remaining samples (ONW, PINW, and NIW) originate from fall deposits produced during the~77 ka Lathrop Wells eruption in the Southwestern Nevada Volcanic Field, USA.…”

Section: Methodsmentioning

confidence: 99%

Compositional and Mineralogical Effects on Ice Nucleation Activity of Volcanic Ash

et al. 2018

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Volcanic ash produced during explosive eruptions may serve as ice nuclei in the atmosphere, contributing to the occurrence of volcanic lightning due to tribocharging from ice-ice or ice-ash collisions. Here, different ash samples were tested using deposition-mode and immersion-mode ice nucleation experiments. Results show that bulk composition and mineral abundance have no measurable effect on depositional freezing at the temperatures tested, as all samples have similar ice saturation ratios. In the immersion mode, there is a strong positive correlation between K 2 O content and ice nucleation site density at −25 • C and a strong negative correlation between MnO and TiO 2 content at temperatures from −35 to −30 • C. The most efficient sample in the immersion mode has the highest surface area, smallest average grain size, highest K 2 O content, and lowest MnO content. These results indicate that although ash abundance-which creates more available surface area for nucleation-has a significant effect on immersion-mode freezing, composition may also contribute. Consequently, highly explosive eruptions of compositionally evolved magmas create the necessary parameters to promote ice nucleation on grain surfaces, which permits tribocharging due to ice-ice or ice-ash collisions, and contribute to the frequent occurrence of volcanic lightning within the eruptive column and plume during these events.

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Section: Methodsmentioning

confidence: 99%

Compositional and Mineralogical Effects on Ice Nucleation Activity of Volcanic Ash

et al. 2018

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“…U-Th disequilibrium model-age contrasts between zircons extracted from the precursor 'Oruanui-type' magmas and those from the Oruanui magma itself (Wilson and Charlier 2009) and element diffusion modelling indicate that although the broader Oruanui mush source likely developed over tens of thousands of years, the eruptible melt-dominant magma body was accumulated in 3000 years or less. The Oruanui juvenile material was >99 % rhyolite, with a minor (<1 %) component of mafic magmas (Sutton et al 1995;Wilson et al 2006). Investigation of pumice compositions has shown that there was a complex range of rhyolite melts involved, with a dominant high-silica rhyolite (HSR), minor amounts of a low-silica rhyolite (LSR) and traces of an independent biotite-bearing (BtB) magma introduced via syneruptive diking from the contemporaneous NE dome magmatic system Allan et al 2012;Allan 2013;Fig.…”

Section: Electronic Supplementary Materialsmentioning

confidence: 98%

“…The period between ~60 and 25 ka was dominated by small pyroclastic eruptions from vents now mostly concealed beneath Lake Taupo, interspersed with a series of small but chemically distinct eruptions from Maroa volcano to the north Sutton et al 1995;Wilson and Charlier 2009; Rowland et al (2010). The horizontal black dashed line marks the arbitrary boundary between Taupo (T) and Maroa (M) volcanoes, and the brown dotted line represents the inferred Whakamaru caldera boundary (Wilson et al 1986).…”

Section: Eruptive Stratigraphy and Samplingmentioning

confidence: 98%

“…The first post-Oruanui eruptions (21-17 ka) were dacitic and erupted from the northern segment of the Oruanui caldera (units Ψ, Ω and A). The remaining eruptions are clustered into three temporally and chemically distinct rhyolitic subgroups (SG1-3), erupted from multiple vents in discrete periods from 11.8 to 9.95 ka (SG1: units B-E), 7.05-2.75 ka (SG2: units F-W) and 2.15-1.8 ka (SG3: units X-Z) (Sutton et al 1995(Sutton et al , 2000 Fig. 1; Table 1).…”

Section: Electronic Supplementary Materialsmentioning

confidence: 99%

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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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“…Hervig & Dunbar ( 1992) advocated mixing of the less-evolved component into the base of the chamber. Alternatively, Briggs et al (1993) and Sutton et al (1995) suggested that batches of magma may be derived from different chambers and erupted simultaneously.…”

Section: Discussionmentioning

confidence: 99%

Weak chemical and mineralogical zonation in the Kaingaroa Ignimbrite, Taupo Volcanic Zone, New Zealand

Beresford

Cole

Weaver

2000

New Zealand Journal of Geology and Geophysics

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The 0.23 Ma Kaingaroa Ignimbrite is a composite, multiple flow-unit ignimbrite erupted from the Reporoa Caldera, Taupo Volcanic Zone, New Zealand. Reporoa Caldera evolved from a single vent during the initial stages of the Kaingaroa eruption, to a trapdoor caldera with the opening up of fractures along the eastern margin and asymmetric eruption of early phases of the ignimbrite. Finally, plate collapse occurred during the later stages of the eruption. Kaingaroa Ignimbrite pumice clasts range in composition from dacite to rhyolite. Five pumice types have been identified based largely on the geochemical variation of Rb and Sr and ferromagnesian mineral composition. Pumice types A, B, C, and D exhibit variations in mineralogy, trace element chemistry, and isotopic composition consistent with derivation from a weakly zoned magma chamber. A subordinate dacitic juvenile component (type E) appears to be unrelated to the Kaingaroa pumices by crystal fractionation or assimilation, and is interpreted as a distinct magma batch that was incorporated into the eruption. The asymmetrical removal of magma from the chamber during caldera collapse is inferred to have resulted in a greater degree of drawdown along the eastern margin of the chamber, as suggested by the current spatial distribution of post-caldera rhyolites.

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An outline geochemistry of rhyolite eruptives from Taupo volcanic centre, New Zealand

Cited by 124 publications

References 33 publications

Compositional and Mineralogical Effects on Ice Nucleation Activity of Volcanic Ash

Compositional and Mineralogical Effects on Ice Nucleation Activity of Volcanic Ash

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

Weak chemical and mineralogical zonation in the Kaingaroa Ignimbrite, Taupo Volcanic Zone, New Zealand

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