Silicic recharge of multiple rhyolite magmas by basaltic intrusion during the 22.6 ka Okareka Eruption Episode, New Zealand

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

doi:10.1016/j.lithos.2007.11.002

Cited by 80 publications

(101 citation statements)

References 39 publications

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“…Nevertheless, the studied BVF ignimbrites are crystal-poor products and therefore derive from meltdominated lenses. Thus, evolved melts from the magma differentiation zones have assembled into a common meltdominated lens, presumably just before the eruption, as discussed for a number of silicic volcanic units worldwide (Shane et al 2008;Cooper et al 2012;Ellis and Wolff 2012;Bégué et al 2014;Wotzlaw et al 2014;. This resulted in evacuation of crystal-poor magmas, but with a zircon crystal cargo preserving the heterogeneous, longlived compositional character of the magma storage.…”

Section: Zircon Trace Element Constraints On the Magma Evolutionmentioning

confidence: 99%

Zircon geochronology and geochemistry to constrain the youngest eruption events and magma evolution of the Mid-Miocene ignimbrite flare-up in the Pannonian Basin, eastern central Europe

Lukács

Harangi

Bachmann

et al. 2015

Contrib Mineral Petrol

130

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A silicic ignimbrite flare-up episode occurred in the Pannonian Basin during the Miocene, coeval with the synextensional period in the region. It produced important correlation horizons in the regional stratigraphy; however, they lacked precise and accurate geochronology. Here, we used U-Pb (LA-ICP-MS and ID-TIMS) and (U-Th)/He dating of zircons to determine the eruption ages of the youngest stage of this volcanic activity and constrain the longevity of the magma storage in crustal reservoirs. Reliability of the U-Pb data is supported by (U-Th)/He zircon dating and magnetostratigraphic constraints. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 2 counter clockwise block rotation and the beginning of a new deformation phase, which structurally characterised the onset of the youngest volcanic and sedimentary phase.

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Section: Zircon Trace Element Constraints On the Magma Evolutionmentioning

confidence: 99%

Zircon geochronology and geochemistry to constrain the youngest eruption events and magma evolution of the Mid-Miocene ignimbrite flare-up in the Pannonian Basin, eastern central Europe

Lukács

Harangi

Bachmann

et al. 2015

Contrib Mineral Petrol

130

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“…Nakamura 1995;Civetta et al 1997;Signorelli et al 1999;Smith et al 2004;Shane et al 2005Shane et al , 2007Shane et al , 2008Pabst et al 2007). Since the definition of the magma chamber is ambiguous in the literature (e.g.…”

Section: Model 3: Derivation From Isolated Magma Batches and Syn-erupmentioning

confidence: 99%

“…Hildreth and Wilson 2007;Bachmann and Bergantz 2008), it is necessary to indicate how we use this term. We define the magma chamber here as a storage zone, where eruptible magma with much less than 50% crystal fraction is accumulated (it is also called melt lens by Hildreth and Wilson 2007, and melt pod by Shane et al 2008), whereas magma reservoirs are much larger and include a huge fraction of crystal mush, which is usually uneruptible due to its high viscosity. At the roof zone of the porous crystal mush system, high-Si rhyolitic melts, having undergone different crystallization processes and cooling histories, could be formed in spatially isolated magma chambers.…”

Section: Model 3: Derivation From Isolated Magma Batches and Syn-erupmentioning

confidence: 99%

“…A large volume-rhyolitic eruption such as that of the Bishop tuff (about 600 km 3 in volume) requires amalgamation of the separated small magma chambers (Hildreth 2004;Hildreth and Wilson 2007). In other cases the spatially separated liquid pods are coevally withdrawn, as happened during the Glass Mountain eruptions in the pre-caldera stage of the Long Valley volcanism (Hildreth and Wilson 2007) and during the Okareka eruption of the Tarawera volcanic complex in the Taupo zone (Shane et al 2008). In the latter case the erupted product involved fragments of at least three distinct rhyolitic bodies.…”

Section: Model 3: Derivation From Isolated Magma Batches and Syn-erupmentioning

confidence: 99%

“…The triggering mechanism of the violent volcanic eruption is often intrusion of basaltic magma into the more evolved felsic magma chamber (Sparks et al 1977;Pallister et al 1996;Murphy et al 2000;Nairn et al 2004), but in some cases the arrival of a new rhyolitic magma reactivates another rhyolite magma at depth Eichelberger and Izbekov 2000;Smith et al 2004;Shane et al 2008). In the Harsány eruption episode, no sign of basaltic intrusion can be observed.…”

Section: Model 3: Derivation From Isolated Magma Batches and Syn-erupmentioning

confidence: 99%

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Bimodal pumice populations in the 13.5 Ma Harsány ignimbrite, Bükkalja Volcanic Field, Northern Hungary: Syn-eruptive mingling of distinct rhyolitic magma batches?

Lukács

Harangi

Mason

et al. 2009

Central European Geology

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The 13.5 Ma Harsány ignimbrite, in the eastern part of the Bükkalja volcanic field, eastern-central Europe, provides a rare example of mingled rhyolite. It consists of two distinct pumice populations ('A'-and 'B'-type) that can be recognized only by detailed geochemical work. The pumice and the host ignimbrite have a similar mineral assemblage involving quartz, plagioclase, biotite and sporadic Kfeldspar. Zircon, allanite, apatite and ilmenite occur as accessory minerals. The distinct pumice types are recognized by their different trace element compositions and the different CaO contents of their groundmass glasses. Plagioclase has an overlapping composition; however, biotite shows bimodal composition. Based on trace element and major element modeling, a derivation of 'A'-type rhyolite magma from the 'B'-type magma by fractional crystallization is excluded. Thus, the two pumice types represent two isolated rhyolite magma batches, possibly residing in the same crystal mush. Coeval remobilization of the felsic magmas might be initiated by intrusion of hot basaltic magma into the silicic magma reservoir The rapid ascent of the foaming rhyolite magmas enabled only a short-lived interaction and thus, a syn-eruptive mingling between the two magma batches. Central European Geology, Vol. 52/1, pp. 51-72 (2009) DOI: 10.1556/CEuGeol.52.2009 Bimodal pumice populations in the 13.

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Zircon U‐Pb geochronology of the Mount Givens Granodiorite: Implications for the genesis of large volumes of eruptible magma

Frazer

Coleman

Mills³

2014

JGR Solid Earth

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The Mount Givens Granodiorite, a large pluton in the central Sierra Nevada batholith, California, is similar in area to zoned intrusive suites yet is comparatively chemically and texturally homogenous. New zircon U-Pb geochronology indicates that the pluton was constructed over at least 7 Ma from 97.92 ± 0.06 Ma to 90.87 ± 0.05 Ma. Combining the new geochronology with the exposed volume of the pluton yields an estimated magma flux of <0.001 km 3 /a. The geochronologic data are at odds with the previously speculated links between plutons such as the Mount Givens Granodiorite and large-volume homogeneous ignimbrites (often termed monotonous intermediates). Existing data indicate that large plutons accumulate at rates of ≤0.001 km 3 /a, 1-2 orders of magnitude less than fluxes calculated for dated monotonous intermediates. If monotonous intermediates are remobilized, erupted plutons accumulated at rates comparable to dated examples, they should preserve a record of zircon growth of up to 10 Ma. Alternatively, the long history of zircon growth recorded in plutons may be erased during the processes of reheating and remobilization that precede supervolcano eruption. However, zircon dissolution modeling, based on hypothetical temperature-time histories for preeruptive monotonous intermediates, indicates that rejuvenation events would not sufficiently dissolve zircon. We suggest that eruptions of monotonous intermediates occur during high magmatic flux events, leaving little behind in the intrusive rock record, whereas low fluxes favor pluton accumulation.

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Silicic recharge of multiple rhyolite magmas by basaltic intrusion during the 22.6 ka Okareka Eruption Episode, New Zealand

Cited by 80 publications

References 39 publications

Zircon geochronology and geochemistry to constrain the youngest eruption events and magma evolution of the Mid-Miocene ignimbrite flare-up in the Pannonian Basin, eastern central Europe

Zircon geochronology and geochemistry to constrain the youngest eruption events and magma evolution of the Mid-Miocene ignimbrite flare-up in the Pannonian Basin, eastern central Europe

Bimodal pumice populations in the 13.5 Ma Harsány ignimbrite, Bükkalja Volcanic Field, Northern Hungary: Syn-eruptive mingling of distinct rhyolitic magma batches?

Zircon U‐Pb geochronology of the Mount Givens Granodiorite: Implications for the genesis of large volumes of eruptible magma

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