Lithosedimentological and tephrostratigraphical characterisation of small-volume, low-intensity eruptions: The 1800 years Tufa Trig Formation, Mt. Ruapehu (New Zealand)

Voloschina, Marija; Lube, Gert; Procter, Jonathan; Moebis, Anja; Timm, Christian

doi:10.1016/j.jvolgeores.2020.106987

Cited by 6 publications

(2 citation statements)

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“…Deposits of the Tufa Trig Formation are preserved in places throughout approximately the northern half of the TNP area and comprise at least nineteen andesitic tephras, each representing a moderate explosive eruption (one every ∼100 years, on average) through Te Wai ā-Moe/Crater Lake (Figure 9D; Donoghue et al 1997). Voloschina et al (2020) add further detail to the Tufa Trig Formation sequence and explore the complexity of these eruptions. Preservation bias favours the identification of large tephra eruptions over small ones at TNP (as demonstrated in the work of Voloschina et al 2020).…”

Section: Ring-plains: Pyroclastic Lahar and Sectorcollapse Depositsmentioning

confidence: 99%

“…Voloschina et al (2020) add further detail to the Tufa Trig Formation sequence and explore the complexity of these eruptions. Preservation bias favours the identification of large tephra eruptions over small ones at TNP (as demonstrated in the work of Voloschina et al 2020). Moebis et al (2011) have shown, however, that the sources of thin and fine layers of tephra that are preserved on and near the volcanoes may be distinguished by the major element geochemistry of the glassy groundmass.…”

Section: Ring-plains: Pyroclastic Lahar and Sectorcollapse Depositsmentioning

confidence: 99%

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Ruapehu and Tongariro stratovolcanoes: a review of current understanding

Leonard

Christenson

et al. 2021

New Zealand Journal of Geology and Geophysics

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Ruapehu (150 km 3 cone, 150 km 3 ring-plain) and Tongariro (90 km 3 cone, 60 km 3 ring-plain) are iconic stratovolcanoes, formed since ∼230 and ∼350 ka, respectively, in the southern Taupo Volcanic Zone and Taupo Rift. These volcanoes rest on Mesozoic metasedimentary basement with local intervening Miocene sediments. Both volcanoes have complex growth histories, closely linked to the presence or absence of glacial ice that controlled the distribution and preservation of lavas. Ruapehu cone-building vents are focused into a short NNE-separated pair, whereas Tongariro vents are more widely distributed along that trend, the differences reflecting local rifting rates and faulting intensities. Both volcanoes have erupted basaltic andesite to dacite (53-66 wt.% silica), but mostly plagioclase-two pyroxene andesites from storage zones at 5-10 km depth. Erupted compositions contain evidence for magma mixing and interaction with basement rocks. Each volcano has an independent magmatic system and a growth history related to long-term (>10 4 years) cycles of mantlederived magma supply, unrelated to glacial/interglacial cycles. Historic eruptions at both volcanoes are compositionally diverse, reflecting small, dispersed magma sources. Both volcanoes often show signs of volcanic unrest and have erupted with a wide range of styles and associated hazards, most recently in 2007 (Ruapehu) and 2012 (Tongariro).

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Section: Ring-plains: Pyroclastic Lahar and Sectorcollapse Depositsmentioning

confidence: 99%