An integrated model for the temporal evolution of andesites and rhyolites and crustal development in New Zealand's North Island

Price, Richard; Gamble, J. A.; Smith, I. E.; Stewart, Robert B.; Eggins, Stephen; Wright, I. C.

doi:10.1016/j.jvolgeores.2004.07.013

Cited by 177 publications

(143 citation statements)

References 67 publications

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“…The geothermal gradient in one of the 3 km deep wells, about 30 km south-southeast of Krakatau, has been estimated to be as high as 67 °C/km (Nishimura et al 1986). With the model proposed by Price et al (2005) and the cyclicity of van Bemmelen (1949) (Fig. 11b) in mind, the possible shallowing of the plumbing system detected in this study (Fig.…”

Section: A Model For Anak Krakataumentioning

confidence: 51%

“…Thermal preconditioning of the upper crust by mafic to intermediate magmas has been suggested to be a major factor in the production of rhyolitic magmas (e.g. Troll et al 2004;Price et al 2005;Annen et al 2006). Such a petrogenic model could be applicable to the Krakatau complex, considering its history of recurring major dacitic-rhyolitic eruptions with intermittent periods of mafic to intermediate magmatism.…”

Section: A Model For Anak Krakataumentioning

confidence: 99%

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Magma plumbing beneath Anak Krakatau volcano, Indonesia: evidence for multiple magma storage regions

Dahrén

Troll

Andersson

et al. 2011

Contrib Mineral Petrol

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Understanding magma plumbing is essential for predicting the behaviour of explosive volcanoes. We investigate magma plumbing at the highly active Anak Krakatau volcano (Indonesia), situated on the rim of the 1883 Krakatau caldera by employing a suite of thermobarometric models. These include, clinopyroxene-melt thermobarometry, plagioclasemelt thermobarometry, clinopyroxene composition barometry and olivine-melt thermometry. Petrological studies have previously identified shallow magma storage in the region of 2-8 km beneath Krakatau, while existing seismic evidence points towards midto deep-crustal storage zone(s), at 9 and 22 km respectively. Our results show that clinopyroxene in Anak Krakatau lavas crystallized at a depth of 7-12 km, while plagioclase record both shallow crustal (3-7 km) and sub-Moho (23-28 km) levels of crystallisation. These magma storage regions coincide with well constrained major lithological boundaries in the crust, implying that magma ascent and storage at Anak Krakatau is strongly controlled by crustal properties. A tandem seismic tomography survey independently identified a separate upper crustal (< 7 km) and a lower to mid-crustal magma storage region (> 7 km). Both petrological and seismic methods are sensitive in detecting magma bodies in the crust, but suffer from various limitations. Combined geophysical and petrological surveys, in turn, offer increased potential for a comprehensive characterization of magma plumbing at active volcanic complexes.

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Section: A Model For Anak Krakataumentioning

confidence: 51%

Section: A Model For Anak Krakataumentioning

confidence: 99%

Magma plumbing beneath Anak Krakatau volcano, Indonesia: evidence for multiple magma storage regions

Dahrén

Troll

Andersson

et al. 2011

Contrib Mineral Petrol

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“…10). It is important to highlight that on the basis of similar stratigraphic patterns recorded in other depocentres of the basin (Pángaro et al, 2002;Franzese et al, 2006;Franzese et al, 2007;Llambías et al, 2007;D'Elia et al, 2012), as well as in other volcanic extensional basins in the world (e.g., the volcanic Taupo zone; Price et al, 2005;Rowland et al, 2010), it can be stated that this model could be useful to characterize the volcanic-rift depocentres at the onset of the Neuquén Basin.…”

Section: Discussion: Evolution and Tectonostratigraphic Controls Overmentioning

confidence: 74%

Tectonostratigraphic analysis of the Late Triassic-Early Jurassic syn-rift sequence of the Neuquen Basin in the Sanico depocentre, Neuquen Province, Argentina

D’Elía¹,

Muravchik²,

Franzese³

et al. 2012

Andgeo

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ABSTRAcT. The initial syn-rift infill (Upper Triassic-Lower Jurassic) of the Neuquén Basin involved a complex stacking of lava, pyroclastic and sedimentary units, in which volcanic rocks compose up to 72% of the infill. The high-quality outcrops of the southern Sañicó depocentre, which was uplifted and exposed during the Andean orogeny, were studied in order to determine the lithofacies arrangements, the tectonostratigraphic framework and the main controls over the syn-rift succession. The tectonostratigraphic study made it possible to determine three sections characterized by the predominance of effusive, pyroclastic or sedimentary deposits. These sections indicate three different evolutionary stages of the volcanic rifting. The onset of this rift stage was dominated by effusive rocks with minor ignimbrite and alluvial volcaniclastic units, which indicates the occurrence of composite volcanoes at the boundaries of the depocentre. The mid-rift stage was characterized by the development of fault-controlled, large ignimbrite deposits intebedded with volcaniclastic alluvial deposits and lava units, which suggests a volcanotectonic depression related to asymmetrical and incremental subsidence. The end of the volcanic rifting event was marked by a decrease in the volume of the volcanic rocks and the occurrence of low-relief effusive aggradational volcanic edifices and lava fields in close relation with alluvial, deltaic and lacustrine units. The analysis of the synrift sequence in the Sañicó depocentre showed the complex relationships between tectonic and volcanic controls which occurred in different magnitudes and times during the rifting evolution. Keywords: Neuquén Basin, Argentina, Tectonostratigraphy, Volcanism and sedimentation. 134 TecTonosTraTigraphic analysis of The laTe Triassic-early Jurassic syn-rifT sequence of The neuquén Basin... RESuMEN. Análisis tectonoestratigráfico de la secuencia de sin-rift Triásico Superior-Jurásico Inferior de la cuenca Neuquina en el depocentro de Sañicó, provincia del Neuquén, Argentina. Los depósitos de sin-rift desarrollados durante la etapa de 'rifting' inicial (Triásico Superior-Jurásico Inferior) de la Cuenca Neuquina están constituidos por un arreglo complejo de unidades lávicas, piroclásticas y sedimentarias, donde las rocas volcánicas componen hasta un 72% del relleno. La inversión andina causó la exhumación y la excelente exposición de las rocas que componen este ciclo en el depocentro de Sañicó, ubicado en el límite sur de la Cuenca Neuquina. El objetivo del presente trabajo es el estudio del relleno sin-tectónico inicial, poniendo especial énfasis en los arreglos de facies, el marco tectonoestratigráfico y los principales controles que operaron durante la evolución del relleno inicial de la cuenca en este depocentro. El análisis estratigráfico y de facies reveló la distribución lateral y vertical de las unidades involucradas en el relleno, mientras que el estudio tectonoestratigráfico permitió la subdivisión del relleno en tres secciones, caracterizadas por la...

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“…These crystals in lavas often show disequilibrium with whole rock compositions and each other [44,45]. Further, compositions of the crystal phases, as at Egmont, show morphological and compositional similarity to the same phases found in xenoliths hosted in the lavas [45].…”

Section: Tgvc -Ruapehu and Tongariromentioning

confidence: 72%

“…Plagioclase is strongly zoned, sievetextured and shows clear evidence of resorption. Core compositions are up to An 89 while rim compositions are variable, reflecting late stage crystallisation, and in rare cases can be K-rich, as much as Or 45 An 6 [17]. Hornblendes show reaction rims of Fe-oxides in lavas while those in tephras often lack the reaction rims, suggesting that the hornblende breakdown was late stage, probable due to conduit degassing and relatively slow lava effusion compared with explosive tephra emission.…”

Section: Tavc -Egmont Volcanomentioning

confidence: 99%

Andesites as Magmatic Liquids or Liquid-crystal Mixtures; Insights from Egmont and Ruapehu Volcanoes, New Zealand Research Article

Stewart¹

2010

Open Geosciences

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Late Quaternary andesitic magmas in New Zealand contain complexly zoned antecrysts and glomerocrysts that are not in equilibrium with either the host whole rock compositions or siliceous groundmass glass and glass inclusions. Glass inclusions represent partial melts of mafic to gabbroic cumulates in the lower crust that mix with restite crystals, or cumulates from earlier magma batches. Assimilation of partial melts of mid-crustal rocks, represented by glass in crustal xenoliths, contributes a crustal component to the andesites. Magmas at Egmont are stored at about the brittle/ductile transition at about 10 km depth and variability in the composition of erupted material is a function of the composition of the recharging magma, and which parts of the storage system are tapped during the eruption. At Taranaki recharge occurs on a c. 1400 year cycle while interactions within the storage give rise to shorter period events. A similar process on a less well constrained timescale operates at Ruapehu. Andesites are therefore complex mixtures of fractionated mantle basalts, siliceous partial melts of both the lower crust and underplated cumulates, restite and cumulate crystals. Further modification occurs by interaction with partial melts of lower to middle crustal basement as geotherms increase with time.

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An integrated model for the temporal evolution of andesites and rhyolites and crustal development in New Zealand's North Island

Cited by 177 publications

References 67 publications

Magma plumbing beneath Anak Krakatau volcano, Indonesia: evidence for multiple magma storage regions

Magma plumbing beneath Anak Krakatau volcano, Indonesia: evidence for multiple magma storage regions

Tectonostratigraphic analysis of the Late Triassic-Early Jurassic syn-rift sequence of the Neuquen Basin in the Sanico depocentre, Neuquen Province, Argentina

Andesites as Magmatic Liquids or Liquid-crystal Mixtures; Insights from Egmont and Ruapehu Volcanoes, New Zealand Research Article

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