Prentice et al submitted.pdf (3.9 MB)
Volcanogenic processes and petrogenesis of the early Pleistocene andesiticdacitic Maungatautari composite cone, Central Waikato, New Zealand
journal contributionposted on 2023-05-20, 08:09 authored by Prentice, ML, Pittari, A, Shaun BarkerShaun Barker, Moon, VG
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.
Publication titleNew Zealand Journal of Geology and Geophysics
Department/SchoolSchool of Natural Sciences
Place of publicationPo Box 399, Wellington, New Zealand
Rights statement© 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