Holocene tephra formations erupted in the Taupo area, and interbedded tephras from other volcanic sources

Vucetich, C. G.; Pullar, W. A.

doi:10.1080/00288306.1973.10431394

Cited by 70 publications

(69 citation statements)

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“…They noted (p. 760) that in many sections "Hinemaiaia Ash occurs sandwiched within a multiple paleosol which has a 'blotchy' appearance". Neither Whakatane nor Rotoma Ash can be mapped as discrete tephra units south of De Bretts, both having an Okatama source (Vucetich & Pullar 1973 …”

Section: Previous Workmentioning

confidence: 99%

“…As new roads are built, especially in forested areas where exposure is normally poor, stratigraphic problems can often be resolved. With the development of Lake Taupo State Forest, east of Lake Taupo, an extensive network of new roads has provided many sections which have allowed the mapping problems encountered by Vucetich & Pullar (1973) to be resolved.…”

Section: Received 18 July 1980 Revised 9 March 1981mentioning

confidence: 99%

“…The purpose of this paper is to revise the Holocene tephra stratigraphy of Vucetich & Pullar (1973) by redefining their Hinemaiaia Ash. At a new type section a new tephra, Motutere Tephra Formation, is defined lying stratigraphically immediately below Hinemaiaia Tephra.…”

Section: Received 18 July 1980 Revised 9 March 1981mentioning

confidence: 99%

“…Subsequently, Healy (1964b) redefined and renumbered Taupo Subgroup beds from a road section opposite De Bretts Hotel, Taupo. In their major revision of the Taupo Holocene tephras, Vucetich & Pullar (1973), defined 8 tephra formations, including Hinemaiaia Ash, and established their stratigraphy, distribution, and chronology. They defined Hinemaiaia Ash at the De Bretts type section as the "tephras lying conformably between the Whakatane and Rotorua Ash Formations" ("Rotorua Ash" should read Rotoma Ash as shown in their appendix description; C. G. Vucetich pers.…”

Section: Previous Workmentioning

confidence: 99%

“…A rhyolitic Tephra Formation in Late Quaternary context was defined by Vucetich & Pullar (1973) and Howorth (1975) using the sharp contacts of paleosols at the top and base. For paleosols representing long periods of intervening quiescence or intense climatic weathering, the contacts are readily identified.…”

Section: Paleosolsmentioning

confidence: 99%

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Motutere Tephra Formation and redefinition of Hinemaiaia Tephra formation, Taupo Volcanic Centre, New Zealand

Froggait

1981

New Zealand Journal of Geology and Geophysics

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Motutere and Hinemaiaia Tephra Formations are moderately widespread rhyolitic tephras erupted from near the southeast margin of Lake Taupo. The 2 multiple-bedded formations constitute a prolonged eruptive sequence interrupted by a short hiatus. The eruptive sequence comprises a plinian-type eruption of coarse pumice lapilli (Motutere Tephra (new name), volume c. 1 kIn 3 ), and further eruptions of a more widespread vitric ash (Hinemaiaia Tephra, volume c. 3 kIn 3 ) apparently related to the growth of a rhyolite dome. Isopach data for both tephras place the eruptive vent near the southeast margin of Lake Taupo in the vicinity of Te Rangiita. Bathymetry and geophysical data suggest the presence of a rhyolite dome 2 kIn offshore and within the vent area.Two unpublished radiocarbon dates of 5370 ± 90 years B.P. (NZ4846A) for Motutere Tephra and 4650 ± 80 years B.P. (NZ4574A) (old T!) for Hinemaiaia Tephra establish the age of these tephras.

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Section: Previous Workmentioning

confidence: 99%

Section: Received 18 July 1980 Revised 9 March 1981mentioning

confidence: 99%

Section: Received 18 July 1980 Revised 9 March 1981mentioning

confidence: 99%

Section: Previous Workmentioning

confidence: 99%

Section: Paleosolsmentioning

confidence: 99%

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Motutere Tephra Formation and redefinition of Hinemaiaia Tephra formation, Taupo Volcanic Centre, New Zealand

Froggait

1981

New Zealand Journal of Geology and Geophysics

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Caldera Volcanoes of the Taupo Volcanic Zone, New Zealand

Series¹

1984

Collected Reprint Series

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The Taupo volcanic zone (TVZ) has been active since 2 Ma and has erupted > 10 '• km 3 of dominantly rhyolitic magma during the last 1 m.y. Most of the volcanism is concentrated in a 125 x 60 km area forming the central TVZ and is expressed largely as six major caldera volcanoes, Rotorua, Okataina, Kapenga, Mangakino, Maroa, and Taupo, marked by localized collapse of the underlying basement and clustering of known or inferred vent sites. These centers have activity spans from 150 to 600 ka and have each erupted at least 300 to 1000 km 3 of magma. All centers except Rotorua are known or inferred to have had complex histories of multiple caldera collapse, which have occurred alongside general basement collapse within the TVZ accompanying regional extension. Deep-seated NE trending basement lineations and/or faults have influenced vent sites at Okataina, Maroa, and Taupo. Welded ignimbrites are prominent in the pre-140 ka record; their absence since then is attributed to the effects of surface water on eruption styles rather than to a change in eruptive behavior. Volcanism from the centers has been overwhelmingly rhyolitic (> 97%; SiO 2 69-77 wt %) with minor high-A1 basalt and dacite and traces of andesitc, mostly as lithic fragments in ignimbrites from Okataina and Mangakino. Although insignificant in volume, the basalt is important as a low-Si end-member in mixing relationships with the rhyolite (at one extreme generating the dacites) and occasionally as a trigger for the rhyolitic eruptions. The current average rhyolite magma eruption rate from the central TVZ is ~0.27 m 3 s -x, equally divided between Okataina and Taupo, a figure close to the long-term average for the last 1.1 Ma. However, geothermal heat flow data imply that a further 1.4-1.8 m 3 s-x of magma may be intruded within the crust. The ratio of inferred intruded material to erupted material is higher at centers where lava extrusions are volumetrically significant (Okataina, Maroa), and this is correlated with lower phenocryst equilibration temperatures in the eruptives. Evidence for resurgent doming and long-term (> 105 years) magma cycles documented at similarly sized rhyolitic calderas in the western United States is absent from the TVZ centers; this is attributed to the young faulted crust of the region, preventing the formation of sufficiently large high-level magma chambers. In overall terms, the central TVZ is comparable in size and longevity to the Yellowstone system, but its individual eruptions have very much shorter recurrence intervals and smaller volumes. INTRODUCTION The Taupo volcanic zone (TVZ) is a complex volcanotectonic depression which is the locus of Quaternary volcanism (and geothermal activity) in the central North Island of New Zealand (Figure 1; Healy [1962]). It is broadly interpreted as a volcanic arc [Ballance, 1976] and/or marginal basin [Cole and Lewis, 1981] parallel to the southern continuation of the Tonga-Kermadec subduction system. The TVZ is only the latest expression of southward younging Cenozoic calc-alkaline vol...

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New Zealand Case Histories Of Pyroclastic Studies

Walker

1981

Tephra Studies

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Holocene tephra formations erupted in the Taupo area, and interbedded tephras from other volcanic sources

Abstract: Rhyolite tephra formations with sources within the Taupo Volcanic Centre include the previously described Taupo Pumice (erupted c. 1819 years B.P.) and Waimihia Lapilli erupted 3400 years B.P.; and the newly described Mapara

Cited by 70 publications

References 8 publications

Motutere Tephra Formation and redefinition of Hinemaiaia Tephra formation, Taupo Volcanic Centre, New Zealand

Motutere Tephra Formation and redefinition of Hinemaiaia Tephra formation, Taupo Volcanic Centre, New Zealand

Caldera Volcanoes of the Taupo Volcanic Zone, New Zealand

New Zealand Case Histories Of Pyroclastic Studies

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