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Volcanogenic processes and petrogenesis of the early Pleistocene andesiticdacitic Maungatautari composite cone, Central Waikato, New Zealand

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Prentice, ML, Pittari, A, Barker, SLL ORCID: 0000-0002-4383-8861 and Moon, VG 2019 , 'Volcanogenic processes and petrogenesis of the early Pleistocene andesiticdacitic Maungatautari composite cone, Central Waikato, New Zealand' , New Zealand Journal of Geology and Geophysics , pp. 1-17 , doi: 10.1080/00288306.2019.1656259.

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Abstract

Maungatautari is an extinct, andesitic-dacitic composite cone situated 35 km southwest of Hamilton, New Zealand. This study examines the volcanic history and petrologic evolution of Maungatautari using field mapping, petrography of pyroclastic successions and lavas, and whole rock and isotope analyses of selected lavas. Lavas consist of non-vesicular labradorite, pyroxene and hornblende andesites and dacites. A small cone of olivine basalt is located at Kairangi, 7 km to the northwest of the Maungatautari trig. Whole rock geochemical and strontium and neodymium analyses demonstrate that these lavas were derived from at least three distinct mantle-melt sources. Mass-wasting processes continue to shape the mountain post volcanic activity and include catastrophic failure of the north-eastern flank which produced a 0.28 km3 rock avalanche deposit. This study considers Maungatautari to reflect andesitic-dacitic arc volcanism occurring within the upper North Island c. 2 Ma.

Item Type: Article
Authors/Creators:Prentice, ML and Pittari, A and Barker, SLL and Moon, VG
Keywords: Maungatautari, geology, volcanism, geochemistry, Waikato, New Zealand
Journal or Publication Title: New Zealand Journal of Geology and Geophysics
Publisher: Sir Publishing
ISSN: 0028-8306
DOI / ID Number: 10.1080/00288306.2019.1656259
Copyright Information:

© 2019 The Royal Society of New Zealand. This is an original manuscript / preprint of an article published by Taylor & Francis in New Zealand journal of geology and geophysics on 29 August 2019, available online: http://www.tandfonline.com/10.1080/00288306.2019.1656259

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