FT4 Waipiata Volcanics
Geosciences 2016 Annual Conference of the Geoscience Society of New Zealand, Wanaka Field Trip 4 28 November 2016 Waipiata Volcanics, Otago, New Zealand Leaders: James D. L. White1, Károly Németh2, Emanuele Giacalone1 1University of Otago, 2Massey University Bibliographic reference: White, J.D.L., Németh, K., Giacalone, E. 2016. Miocene phreatomagmatic monogenetic volcanism of the Waipiata Volcanic Field, Otago, New Zealand. In: Smillie, R.(compiler). Fieldtrip Guides, Geosciences 2016 Conference, Wanaka, New Zealand.Geoscience Society of New Zealand Miscellaneous Publication 145B, 51p. ISBN 978-1-877480-53-9 ISSN (print) : 2230-4487 ISSN (online) : 2230-4495 109 Keywords: tuff ring, scoria cone, maar, diatreme, base surge, sideromelane, erosion. Abstract This guide to a one-day pre-conference field trip includes a summary of the eruption style, mechanisms and landform evolution of the monogenetic volcanoes of the Waipiata Volcanic Field in Otago. The trip will address basic preservation styles and types of phreatomagmatic volcanoes (from eroded tuff rings, to maars and exposed diatremes), and visit some informative sites. We will discuss current scientific problems associated with volcanism in intraplate terrestrial settings, including signs of magmatic complexity in small-volume volcanoes and the potential use of erosional remnants of monogenetic volcanoes in landscape-evolution models for broad regions. The main stops will be at the Swinburn volcanic complex, in the context of a trip from Dunedin to Oamaru with over-look stops for erosional remnants of monogenetic volcanoes in the schist-tor landscape near Middlemarch. Introduction Small-volume volcanic eruptions are commonly associated with monogenetic constructional volcanic landforms such as tephra cones, tephra rings, or tephra mounds consisting of bedded pyroclastic deposits emplaced by fallout, density currents and/or by downslope remobilization of tephra (Connor et al., 2000; Valentine and Gregg, 2008; Vespermann and Schmincke, 2000).
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