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Wikipedia:Map data/Northern North Island Volcanics/key

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<-Wikipedia:Map data/Northern North Island Volcanics Modified volcanics by erosion, alluvial action and sedimentary rocks are not shown to minimise complexity. The data is complimentary to Wikipedia:Map data/South Island Volcanics. The data on distribution and volcanic rock type is by default from NZ 1:250K Geological GNS science but often detail is from original academic work and updates of this. Some simplification was undertaken and the distribution diagrams are certainly approximate. To a degree it is a work in progress with errors likely, although it will sometimes improve on standard sources. Basalt data for example, more often relies on classification before the Le Maitre 2002 classification compared to the companion map to support the article on South Island surface volcanism and is open to improvement by geologists or when academic updates come out. Significant situations that are likely to require this map to need correction, arise in the Bay of Plenty region, such that the Chimpanzee and Pokai ignimbrites near Tauranga appear to have been historically misclassified as Mamaku ignimbrite, the Papamoa formation's five ignimbrites have been better understood and mapping near Waihi is over simplified. So it is likely that these will need correction in due course. Names for flows where a volcanic vent is unnamed or use could be confusing is based on a nearby feature in NZTopoMap and authors own knowledge of likely usual access routes. General age context from the University of Waikato 2015 - Cenozoic sedimentary and volcanic rocks of New Zealand: A reference volume of lithology, age and paleoenvironments with maps (PMAPs) and database compilation. Other specific academic references include:

  1. Pittari, Adrian; Prentice, Marlena L.; McLeod, Oliver E.; Zadeh, Elham Yousef; Kamp, Peter J. J.; Danišík, Martin; Vincent, Kirsty A. (2021). "Inception of the modern North Island (New Zealand) volcanic setting: spatio-temporal patterns of volcanism between 3.0 and 0.9 Ma" (PDF). New Zealand Journal of Geology and Geophysics. 64 (2–3): 250–272. doi:10.1080/00288306.2021.1915343.
  2. Prentice, Marlena; Pittari, Adrian; Lowe, David J.; Kilgour, Geoff; Kamp, Peter J.J.; Namaliu, Miriam (2022). "Linking proximal ignimbrites and coeval distal tephra deposits to establish a record of voluminous Early Quaternary (2.4–1.9 Ma) volcanism of the Tauranga Volcanic Centre, New Zealand". Journal of Volcanology and Geothermal Research. 429 (107595). doi:10.1016/j.jvolgeores.2022.107595. ISSN 0377-0273.
  3. Stagpoole, V; Miller, C; Caratori, Tontini F; Brakenrig, T; Macdonald, N (2021). "A two million-year history of rifting and caldera volcanism imprinted in new gravity anomaly compilation of the Taupō Volcanic Zone, New Zealand". New Zealand Journal of Geology and Geophysics. 64 (2–3): 358–371. doi:10.1080/00288306.2020.1848882.
  4. Prentice, Marlena; Pittari, A.; Kamp, P; Lowe, David J. (2020). "The 2.1 Ma Waiteariki Ignimbrite: Defining a new super-eruption at the onset of TVZ volcanism". Geoscience NZ 2020.
  5. McLeod, OE; Pittari, A; Brenna, M; Briggs, RM (2020). Geology of the Pirongia Volcano, Waikato:1:30,000 Geological Map in The Pirongia Volcano. Geoscience Society of New Zealand Wellington, New Zealand. ISBN 978-0-473-52832-4.
  6. Briggs, R. M. (1983). "Distribution, form, and structural control of the Alexandra Volcanic Group, North Island, New Zealand". New Zealand Journal of Geology and Geophysics. 26 (1): 47–55. doi:10.1080/00288306.1983.10421521.
  7. Ages of the Pliocene—Pleistocene Alexandra and Ngatutura Volcanics, western North Island, New Zealand, and some geological implications (ages)
  8. Hayward, Bruce (2015). "Small satellite explosion craters in the Auckland Volcanic Field". Geocene. 13: 5–12.
  9. Kear, David (2004). "Reassessment of Neogene tectonism and volcanism in North Island, New Zealand". New Zealand Journal of Geology and Geophysics. 47 (3): 361–374. doi:10.1080/00288306.2004.9515062.
  10. Supplement to Smith, Ian E. M.; Cronin, Shane J. (2021). "Geochemical patterns of late Cenozoic intraplate basaltic volcanism in northern New Zealand and their relationship to the behaviour of the mantle". New Zealand Journal of Geology and Geophysics. 64 (2–3): 201–212. doi:10.1080/00288306.2020.1757470.
  11. Hayward, Bruce W.; Black, Philippa M.; Smith, Ian E. M.; Ballance, Peter F.; Itaya, Tetsumaru; Doi, Masako; Takagi, Miki; Bergman, Steve; Adams, Chris J.; Herzer, Richard H.; Robertson, David J. (2001). "K‐Ar ages of early Miocene arc‐type volcanoes in northern New Zealand". New Zealand Journal of Geology and Geophysics. 44 (2): 285–311. doi:10.1080/00288306.2001.9514939.
  12. Kidd, Maia Josephine (2021). Landscape Evolution in Ignimbrite Terrain: a study of the Mamaku Plateau, Taupō Volcanic Zone, New Zealand - Masters thesis, University of Canterbury (PDF) (Thesis).
  13. Briggs, R. M.; Itaya, T.; Lowe, D. J.; Keane, A. J. (1989). "Ages of the Pliocene—Pleistocene Alexandra and Ngatutura Volcanics, western North Island, New Zealand, and some geological implications". New Zealand Journal of Geology and Geophysics. 32 (4): 417–427. doi:10.1080/00288306.1989.10427549.
  14. Benson, Thomas W.; Illsley-Kemp, Finnigan; Elms, Hannah C.; Hamling, Ian J.; Savage, Martha K.; Wilson, Colin J. N.; Mestel, Eleanor R. H.; Barker, Simon J. (2021). "Earthquake Analysis Suggests Dyke Intrusion in 2019 Near Tarawera Volcano, New Zealand". Frontiers in Earth Science. 8. doi:10.3389/feart.2020.606992. ISSN 2296-6463.
  15. Kósik, S; Hasegawa, T; Danišík, M; Németh, K; Okada, M; Friedrichs, B; Schmitt, AK (12 July 2023). "Multi-method constraints on the age and timescale of silicic small-volume eruptions of Puketerata Volcanic Complex, Taupō Volcanic Zone, New Zealand". Earth, Planets and Space. 75 (107). doi:10.1186/s40623-023-01861-0.

Technical Note[edit]

The master map of North Islands Surface Volcanics takes 5 seconds to render first time. There is a cut off of 10 seconds built into wikipedia for such scripting. So do not render twice on same page. The full map data probably best should not have controlling logic added as this might paradoxically add to rendering time and another approach has been taken (eg code on Reporoa Caldera page. Controlling logic also increasing debugging complexity of JSON and this data may be updated to correct oversimplification or mistakes. The companion map of South Island Surface Volcanism was separated off as rendering both on same page exceeds the 10 second limit. Once rendered Wikipedia serves up an image file of the map which is much faster but can lose detail. Detail is always revealed by clicking on the map.

Key[edit]

Clicking on the map enlarges it, and enables panning and mouseover of volcano name/wikilink and ages before present. Key for the volcanics that are shown with panning is:   basalt (shades of brown/orange),   monogenetic basalts,

  undifferentiated basalts of the Tangihua Complex in Northland Allochthon,

  arc basalts,  arc ring basalts,

  dacite,

  andesite (shades of red),   basaltic andesite,

  rhyolite, (ignimbrite is lighter shades of violet),

and   plutonic. White shading is selected caldera features.

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