Maahunui volcanic field

Short description: Submarine volcanic field off New Zealand

Maahunui volcanic field

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Approximate extent of Maahunui volcanic field

Coordinates|  [ ⚑ ] : 44°00′32″S 172°33′54″E﻿ / ﻿44.008986°S 172.564949°E﻿ / -44.008986; 172.564949
Offshore water bodies| Pacific Ocean
Area| 1,520 km2 (590 sq mi)[1]
Geology| Volcanic field
Age| Middle Miocene (15.9–11 Ma)[2]

PreЄ

Last eruption| 11.5 Ma

The Maahunui volcanic field is an extinct basaltic submarine Miocene monogenetic volcanic field[1] off the east coast of the South Island of New Zealand to the south of the more recent Banks Peninsula Volcano.[3]

## Contents

* 1 Geology
* 2 Name
* 3 See also
* 4 References

## Geology

Over 30 volcanic features including craters and cones have been described in the Maahunui Volcanic Field,[1] even although most are buried in up to 1 km (0.62 mi) thickness of ocean sediment.[2] These are intraplate small-volume single event volcanoes.[4] A feature of the field is that it was always underwater, but some of the cones formed islands in the historic sea and then have been eroded with characteristic flattened tops. It has been thought that explosive eruptions are rare in volcanoes whose vents are more than 100 m (330 ft) deep under water, but such must have occurred for some of the located craters that must have been formed at about 1 km (0.62 mi) deep.[1] The eruptions occurred between 15.9 and 11 million years ago, mostly in the last 2 million years of this period.[2] The resulting seamounts were finally all buried about the time that Banks Peninsula was formed in the late Miocene. The area of the field is about 1,520 km2 (590 sq mi) and the presence of the volcanoes is relevant to mineral and other potential exploitation of the Canterbury submarine basin.[1] The detailed understanding of the field results from bore hole and seismic data accumulated over many years of geological mapping.

## Name

The name Maahunui relates to the canoe of Maui which (according to Māori legend) became the South Island of New Zealand. It is the term Māori use for the coast south of Banks Peninsula. It was so named after appropriate consultation in 2019.[3]

## See also

* List of volcanic fields

## References

1. ↑ 1.0 1.1 1.2 1.3 1.4 Bischoff, Alan; Nicol, Andrew; Cole, Jim; Gravley, Darren (2019). "Stratigraphy of Architectural Elements of a Buried Monogenetic Volcanic System". Open Geosciences 11 (1): 581–616. doi:10.1515/geo-2019-0048. Bibcode: 2019OGeo...11...48B.
2. ↑ 2.0 2.1 2.2 Bischoff, Alan; Nicol, Andrew; Barrier, Andrea; Wang, Hanfei (2019). "Characterization of a Middle Miocene Monogenetic Volcanic Field Buried in the Canterbury Basin, New Zealand – Part II". Bulletin of Volcanology 81 (9). doi:10.1007/s00445-019-1317-6. Bibcode: 2019BVol...81...57B. https://www.researchgate.net/publication/332915908.
3. ↑ 3.0 3.1 Bischoff, Alan Patrick (2019). ARCHITECTURAL ELEMENTS OF BURIED VOLCANIC SYSTEMS AND THEIR IMPACT ON GEOENERGY RESOURCES (Thesis).
4. ↑ Bischoff, Alan; Barriera, Andrea; Begg, Mac; Nicola, Andrew; Colea, Jim; Sahoo, Tusar (2020). "Magmatic and Tectonic Interactions Revealed by Buried Volcanoes in Te Riu-a-Māui/Zealandia Sedimentary Basins". New Zealand Journal of Geology and Geophysics 63: 378–401. doi:10.1080/00288306.2020.1773510. https://www.researchgate.net/publication/340210741.

* v
* t
* e

Oceanic features of Zealandia

Major divisions|

* Western Province (North Zealandia)
* Eastern Province (South Zealandia)

Plateaux, ridges, and rises|

* Bellona Plateau
* Bounty Platform
* Campbell Plateau
* Challenger Plateau
* Chatham Rise
* Chesterfield Plateau
* Colville-Lau Ridge
* Dampier Ridge
* Fairway Ridge
* Kenn Plateau
* Lord Howe Plateau
* Loyalty Ridge
* Mellish Rise
* Norfolk Ridge
* Northland Plateau
* Puysegur Ridge
* Resolution Ridge
* Three Kings Ridge
* West Norfolk Ridge

Troughs and trenches|

* Bellona Gap
* Bellona Trough
* Bounty Trough
* Havre Trough
* Hikurangi Trench
* New Caledonia Trough
* Puysegur Trench

Oceanic basins|

* Bellona Basin
* Campbell Basin
* Canterbury Basin
* Capel Basin
* Cato Basin
* Chatham Slope
* Dampier Basin
* Deepwater Taranaki Basin
* East Coast Basin
* Emerald Basin
* Fairway Basin
* Faust Basin
* Gower Basin
* Great South Basin
* Middleton Basin
* Monowai Basin
* Moore Basin
* New Caledonia Basin
* Norfolk Basin
* Northeast Slope
* Northland Basin
* Outer Campbell Basin
* Pegasus Basin
* Pukaki Basin
* Raukumara Basin
* Reinga Basin
* South Fiji Basin
* South Loyalty Basin
* Taranaki Basin
* Wanganui Basin
* West Coast Basin

Seamounts|

* Banc Capel
* Capel Guyot
* Clark Seamount
* Flinder's Seamount
* Gifford Guyot
* Graveyard Seamounts
* Havre Seamount
* Lord Howe Seamount Chain
* Rumble III Seamount
* Rumble IV Seamount
* Rumble V Seamount
* South Kermadec Ridge Seamounts
* Tangaroa Seamount
* Tasmantid Seamount Chain

Other|

* Alpine Fault
* Hikurangi Margin
* Kermadec Plate
* Maari oil field
* Maui gas field
* Pohokura field

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