Ohinewai Tephra Formation; a<i>c.</i>150000-year-old tephra marker in New Zealand

Vucetich, C. G.; Birrell, K. S.; Pullar, W. A.

doi:10.1080/00288306.1978.10420722

Cited by 9 publications

(7 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The stratigraphic position and facies of these deposits are fairly similar to those of deposits of the Hamilton Ash Formation described by Ward (1967), and to those of deposits redefined by Vucetich et al (1978) as Ohinewai Tephra Formation. However, the authors could not investigate the relationship between these 2 formations in the field.…”

Section: Hamilton Ashsupporting

confidence: 58%

“…This conclusion is consistent with the tephra stratigraphy and the age of c. 0.15 m.y. estimated for the Ohinewai Tephra by Vucetich et al (1978). Otamaroa Terrace is conformably overlain by the upper part of the Hamilton Ash, but not by the basal ash that is a probable correlative of the Ohinewai Tephra (c. 0.15 m.y., Vucetich et al 1978).…”

Section: Examination Of Resultsmentioning

confidence: 99%

“…estimated for the Ohinewai Tephra by Vucetich et al (1978). Otamaroa Terrace is conformably overlain by the upper part of the Hamilton Ash, but not by the basal ash that is a probable correlative of the Ohinewai Tephra (c. 0.15 m.y., Vucetich et al 1978). Because the terrace deposits consist mainly of beach gravel, filling depressions more than 20 m deep in the underlying rocks, this terrace is inferred to have been formed under transgressive conditions, and is probably younger than 0.15 m.y.…”

Section: Examination Of Resultsmentioning

confidence: 99%

“…We are obliged to Professors M. Suzuki and K. Tomura, St Paul University, for their kind advice and arrangement for fission-track dating. Finally, our fieldwork in New Zealand was financially supported by a grant-in-aid for overseas scientific survey provided by the Japanese Ministry of Education, Science and Culture, in 1976, 1977, and 1978, which is gratefully acknowledged.…”

Section: Acknowledgmentsmentioning

confidence: 99%

“…The other 2 layers are deeply weathered and often hard to identify. Ha-I is probably correlated to the pumice layer of the Ohinewai Tephra, because they have very similar facies, mineral composition (Table 2), stratigraphic position, and thickness (Vucetich et al 1978). The typical columnar section of the Hamilton Ash (Fig.…”

Section: Hamilton Ashmentioning

confidence: 99%

See 4 more Smart Citations

Fission-track ages of late Pleistocene tephra on the Bay of Plenty coast, North Island, New Zealand

Iso

Okada

Ôta

et al. 1982

New Zealand Journal of Geology and Geophysics

View full text Add to dashboard Cite

In the area surrounding Opotiki on the Bay of Plenty coast, tephra deposits are classified into 3 units: post-Hamilton tephras, Hamilton Ash, and Tablelands Tephra Formation. Each is separated by well-developed paleosols or unconformities. The Rotoehu Ash and the Ohinewai Tephra are located at the bases of the post-Hamilton tephras and the Hamilton Ash, respectively.Tablelands Tephra Formation (new) is defined and tentatively subdivided into upper and lower members by paleosols or unconformities that commonly occur at different exposures. This formation contains several characteristic pumice layers which are very useful for tephrochronological correlation. Obsidian fragments from 3 of the pumice layers in the lower member were collected for fission-track dating, which yielded ages between 0.21 and 0.18 m.y. The fission-track ages of these tephras are consistent with their stratigraphy."Present address:

show abstract

Section: Hamilton Ashsupporting

confidence: 58%

Section: Examination Of Resultsmentioning

confidence: 99%

Section: Examination Of Resultsmentioning

confidence: 99%

Section: Acknowledgmentsmentioning

confidence: 99%

Section: Hamilton Ashmentioning

confidence: 99%

See 3 more Smart Citations

Fission-track ages of late Pleistocene tephra on the Bay of Plenty coast, North Island, New Zealand

Iso

Okada

Ôta

et al. 1982

New Zealand Journal of Geology and Geophysics

View full text Add to dashboard Cite

show abstract

Middle-Late Pleistocene tephrostratigraphy of the eastern Bay of Plenty, New Zealand

Manning

1996

Quaternary International

View full text Add to dashboard Cite

Mineralogy of the Kauroa Ash Formation of south-west and west Waikato, North Island, New Zealand

Kirkman

1980

New Zealand Journal of Geology and Geophysics

View full text Add to dashboard Cite

The clay and sand mineralogy of old (possibly 750 000 years) rhyolitic tephras of two sections located in south-west and west Waikato, New Zealand, has been investigated by X-ray diffraction, differential thermal analysis, infrared spectroscopy, transmission electron microscopy, and the polarising microscope. The tephras are highly weathered and contain a slI)all proportion of sand grains comprised mainly of quartz and magnetite, and are dominated by halloysite which occurs in several morphological forms. Allophane is present in all clay fractions together with gibbsite (in three beds) and lepidocrocite (in two beds). The mineralogy of the tephras is compared with that of the rhyolitic Pahoia Tuffs which are younger.

show abstract

Ohinewai Tephra Formation; ac.150000-year-old tephra marker in New Zealand

Cited by 9 publications

References 5 publications

Fission-track ages of late Pleistocene tephra on the Bay of Plenty coast, North Island, New Zealand

Fission-track ages of late Pleistocene tephra on the Bay of Plenty coast, North Island, New Zealand

Middle-Late Pleistocene tephrostratigraphy of the eastern Bay of Plenty, New Zealand

Mineralogy of the Kauroa Ash Formation of south-west and west Waikato, North Island, New Zealand

Contact Info

Product

Resources

About