Petrology of Calc-alkaline Lavas from Ruapehu Volcano and Related Vents, Taupo Volcanic Zone, New Zealand

Graham, Ian; Hackett, William R.

doi:10.1093/petrology/28.3.531

Cited by 126 publications

(111 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…B, Summary geological map of Ruapehu volcano showinj. major cone-building formations (with inferred ages) of Graham & Hackett (1987), volcanic vents, Tertiary sediment outcrops, nearbtowns, and the location of the Turoa study area (modified from Graham & Hackett 1987). As discussed in the text, no field evidenc was observed for major volcanic vents within the study area.…”

Section: Geological Settingmentioning

confidence: 97%

“…1), a zone of uplift and dextral strike-slip splaying north from the Alpine Fault (Cole 1990). Mount Ruapehu is a composite andesitic stratovolcano which forms part of the Tongariro Volcanic Centre (Graham & Hackett 1987), a cluster of andesitic volcanoes at the most southern end of the dominantly rhyolitic TVZ. The volcano sits c. 100 km above a well-defined, westwards dipping Wadati-Benioff zone, which extends southwards and westwards beneath th o continental crust of the North Island (Hamilton & Gale 1968Adams & Ware 1977.…”

Section: Geological Settingmentioning

confidence: 99%

“…Similar detailed studies have also been carried out in the Whakapapa and Tukino ski-fields (RAP) and will be published as sister studies to the results presented here. The Turoa ski-field was chosen for detailed study because it is dominated by one of Ruapehu's four major cone-building formations (Mangawhero Formation) identified by Graham & Hackett (1987), and because two others also crop out within the region (Fig. 1).…”

Section: Geological Settingmentioning

confidence: 99%

“…42 Previous stratigraphic constraints Hackett (1985) and Graham & Hackett (1987) recognised four volcanic formations on Mt Ruapehu (Te Herenga, Waihianoa, Mangawhero, and Whakapapa; see Fig. 1).…”

mentioning

confidence: 94%

“…Waihianoa Formation (60-120 ka) is best exposed on the southeastern side of Ruapehu, particularly between the Whangaehu and Waihianoa valleys, and is distinguished from the older Te Herenga Formation by a lesser degree of erosional dissection and major lithologic and petrographic differences; no contact between the two units is exposed (Hackett 1985;Graham & Hackett 1987). Waihianoa Formation consists of voluminous lava flows and tuff breccias with variable lithologies and subordinate finegrained tuffaceous deposits.…”

mentioning

confidence: 99%

See 4 more Smart Citations

Stratigraphy and geochemistry of the Turoa area, with implications for andesite petrogenesis at Mt Ruapehu, Taupo Volcanic Zone, New Zealand

Waight

Price

Stewart

et al. 1999

New Zealand Journal of Geology and Geophysics

View full text Add to dashboard Cite

Detailed mapping and sampling on Turoa skifield and surrounding areas on Mt Ruapehu has enabled identification of individual flow packets that represent small scale eruptive events during the major cone-building episodes previously identified on Ruapehu by Graham & Hackett. The area is dominated by plagioclase-pyroxenephyric andesitic lavas of Mangawhero Formation, which are petrographically and geochemically typical of post-120 ka Ruapehu lavas. Although the lavas are from a relatively small area of the volcano, geochemical and isotopic compositions show a range in variation similar to that observed for the entire volcano. Examination of geochemical variations between individual flow packets and also between sequential C98039Received 15 October 1998; accepted 15 June 1999 lava flows indicates complex processes of assimilation and influx of "new", variably evolved and fractionated magmas into high level magma chambers. These chambers are most likely heterogeneous, and individual eruptions may also sample compositionally distinct regions of the same chamber. It is probable that a complex plumbing system exists beneath Ruapehu with at least two levels of magma storage, evolution, and crustal interaction. Consequently, attempts to numerically quantify such a complex system using models such as assimilation-fractional crystallisation processes are inherently oversimplifications.

show abstract

Section: Geological Settingmentioning

confidence: 97%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

mentioning

confidence: 94%

mentioning

confidence: 99%

See 3 more Smart Citations

Stratigraphy and geochemistry of the Turoa area, with implications for andesite petrogenesis at Mt Ruapehu, Taupo Volcanic Zone, New Zealand

Waight

Price

Stewart

et al. 1999

New Zealand Journal of Geology and Geophysics

View full text Add to dashboard Cite

show abstract

Boron isotope variations in Tonga‐Kermadec‐New Zealand arc lavas: Implications for the origin of subduction components and mantle influences

Leeman

Tonarini

Turner

2017

Geochem Geophys Geosyst

View full text Add to dashboard Cite

The Tonga‐Kermadec‐New Zealand volcanic arc is an end‐member of arc systems with fast subduction suggesting that the Tonga sector should have the coolest modern slab thermal structure on Earth. New data for boron concentration and isotopic composition are used to evaluate the contrasting roles of postulated subduction components (sediments and oceanic slab lithologies) in magma genesis. Major observations include: (a) Tonga‐Kermadec volcanic front lavas are enriched in B (as recorded by B/Nb and similar ratios) and most have relatively high δ11B (>+4‰), whereas basaltic lavas from New Zealand have relatively low B/Nb and δ11B (<−3.5‰); (b) both δ11B and B/Nb generally increase northward from New Zealand along with convergence rate and overall slab flux; (c) δ11B and B/Nb decrease toward the back‐arc, as observed elsewhere; and (d) low δ11B is observed in volcanic front samples from Ata, an anomalous sector where the back‐arc Valu Fa Spreading Center impinges on the arc and the Louisville Seamount Chain is presently subducting. Otherwise, volcanic front lavas exhibit positive correlations for both B/Nb and δ11B with other plausible indicators of slab‐derived fluid contributions (e.g., Ba/Nb, U/Th, (230Th/232Th) and 10Be/9Be), and with estimated degree of melting to produce the mafic lavas. Inferred B‐enrichments in the arc magma sources are likely dominated by serpentinite domains deeper within the subducting slab (±altered oceanic crust), and B systematics are consistent with dominant transport by slab‐derived aqueous fluids. Effects of this process are amplified by mantle wedge source depletion due to prior melt extraction.

show abstract

Taupo Volcanic Zone and Central Volcanic Region Backarc Structures of North Island, New Zealand

1995

View full text Add to dashboard Cite

Petrology of Calc-alkaline Lavas from Ruapehu Volcano and Related Vents, Taupo Volcanic Zone, New Zealand

Cited by 126 publications

References 0 publications

Stratigraphy and geochemistry of the Turoa area, with implications for andesite petrogenesis at Mt Ruapehu, Taupo Volcanic Zone, New Zealand

Stratigraphy and geochemistry of the Turoa area, with implications for andesite petrogenesis at Mt Ruapehu, Taupo Volcanic Zone, New Zealand

Boron isotope variations in Tonga‐Kermadec‐New Zealand arc lavas: Implications for the origin of subduction components and mantle influences

Taupo Volcanic Zone and Central Volcanic Region Backarc Structures of North Island, New Zealand

Contact Info

Product

Resources

About