Re-identification of c. 15 700 cal yr BP tephra bed at Kaipo Bog, eastern North Island: implications for dispersal of Rotorua and Puketarata tephra beds.

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dc.contributor.authorShane, Phil A.R.en_US
dc.contributor.authorSmith, Victoria C.en_US
dc.contributor.authorLowe, David J.en_US
dc.contributor.authorNairn, Ian A.en_US
dc.date.accessioned2008-03-19T05:11:19Z
dc.date.available2007-07-05en_US
dc.date.available2008-03-19T05:11:19Z
dc.date.issued2003-12-01en_US
dc.description.abstractA 10 mm thick, c. 15 700 calendar yr BP (c. 13 100 14C yr BP) rhyolitic tephra bed in the well-studied montane Kaipo Bog sequence of eastern North Island was previously correlated with Maroa-derived Puketarata Tephra. We revise this correlation to Okataina-derived Rotorua Tephra based on new compositional data from biotite phenocrysts and glass. The new correlation limits the known dispersal of Puketarata Tephra (sensu stricto, c. 16 800 cal yr BP) and eliminates requirements to either reassess its age or to invoke dual Puketarata eruptive events. Our data show that Rotorua Tephra comprises two glass-shard types: an early-erupted low-K2O type that was dispersed mostly to the northwest, and a high-K2O type dispersed mostly to the south and southeast, contemporary with late-stage lava extrusion. Late-stage Rotorua eruptives contain biotite that is enriched in FeO compared with biotite from Puketarata pyroclastics. The occurrence of Rotorua Tephra in Kaipo Bog (100 km from the source) substantially extends its known distribution to the southeast. Our analyses demonstrate that unrecognised syn-eruption compositional and dispersal changes can cause errors in fingerprinting tephra deposits. However, the compositional complexity, once recognised, provides additional fingerprinting criteria, and also documents magmatic and dispersal processes.en_US
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dc.identifier.citationShane, P., Smith, V.C., Lowe, D.J. & Nairn, I. (2003). Re-identification of c. 15 700 cal yr BP tephra bed at Kaipo Bog, eastern North Island: implications for dispersal of Rotorua and Puketarata tephra beds. New Zealand Journal of Geology & Geophysics. 46(4), 591-596.en_US
dc.identifier.doi10.1080/00288306.2003.9515032en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/135
dc.language.isoen
dc.publisherS I R Publishingen_NZ
dc.relation.isPartOfNew Zealand Journal of Geology & Geophysicsen_NZ
dc.relation.urihttp://www.rsnz.org/publish/nzjgg/2003/041.phpen_US
dc.rightsThe final, definitive version of this article has been published in the Journal, New Zealand Journal of Geology and Geophysics, 46(4), (2003), (c) Royal Society of New Zealand at the Royal Society of New Zealand Journals Online webpage.en_US
dc.subjectTephraen_US
dc.subjectstratigraphyen_US
dc.subjecttephrochronologyen_US
dc.subjectcorrelationen_US
dc.subjectRotorua Tephraen_US
dc.subjectPuketarata Tephraen_US
dc.subjectOkatainaen_US
dc.subjectMaroaen_US
dc.subjectKaipoen_US
dc.subjectrhyoliteen_US
dc.subjectbiotiteen_US
dc.subjectglass chemistryen_US
dc.titleRe-identification of c. 15 700 cal yr BP tephra bed at Kaipo Bog, eastern North Island: implications for dispersal of Rotorua and Puketarata tephra beds.en_US
dc.typeJournal Articleen_US
pubs.begin-page591en_NZ
pubs.elements-id29512
pubs.end-page596en_NZ
pubs.issue4en_NZ
pubs.volume46en_NZ
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