Ngatutura Volcanic Field
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The extinct Ngatutura volcanic field that was active between 1.54 and 1.83 million years ago is one of four volcanic fields in an intraplate back arc relationship with the still active
Hauraki Rift The Hauraki Rift is an active NeS-to NWeSE-striking rift valley system in the North Island of New Zealand that has produced the Firth of Thames and the Hauraki Plains. It is approximately wide and long. Geology The rift valley in the north app ...
and the presently dormant
Auckland volcanic field The Auckland volcanic field is an area of monogenetic volcanoes covered by much of the metropolitan area of Auckland, New Zealand's largest city, located in the North Island. The approximately 53 volcanoes in the field have produced a diverse a ...
. The other volcanic fields, which are part of the Auckland Volcanic Province, are the oldest, Okete to the south near Raglan in late Pliocene times (2.7-1.8 Ma). and to the north the younger
South Auckland volcanic field The South Auckland volcanic field, also known as the Franklin Volcanic Field, is an area of extinct monogenetic volcanoes around Pukekohe, the Franklin area and north-western Waikato, south of the Auckland volcanic field. The field contains at l ...
.


Geology

This field is smaller than the other three and has far fewer basaltic volcanic centres. However at least 16 volcanic centres, mostly scoria cones associated with lava flows of limited
hawaiite Hawaiite is an olivine basalt with a composition between alkali basalt and mugearite. It was first used as a name for some lavas found on the island of Hawaii. It occurs during the later stages of volcanic activity on oceanic islands such as Haw ...
to nepheline hawaiite composition are known. Some of the basalt deposits in this region of the coast are now known to be related to the West Ngatutura volcanic field with a stratigraphic age of c. 3.5 Ma around 60 km offshore. The earlier work on the field had suggested fewer centres being: #Initial vent #*This was under the present sea but basaltic lava flowed to the east so is identifiable in present coastal stratigraphy. #Ohuka Centre #*Likely was a low angle scoria cone associated with an extensive basaltic lava flow of about . #Quarry Centre #*Two vents with limited basaltic extrusions, perhaps erupted along the Ohuka fault plane. #Ngatutura Complex #*Associated with at least five major phases of activity with evidence in nearby bays along the coast. Included some violent magmatophreatic eruptions


See also

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Geology of the Auckland Region The Auckland Region of New Zealand is built on a basement of greywacke rocks that form many of the islands in the Hauraki Gulf, the Hunua Ranges, and land south of Port Waikato. The Waitākere Ranges in the west are the remains of a large andesi ...
*
Geology of the Waikato Region The Waikato and King Country regions of New Zealand are built upon a basement of greywacke rocks, which form many of the hills. Much of the land to the west of the Waikato River and in the King Country to the south has been covered by limestone a ...
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List of volcanoes in New Zealand This is a partial list of active, dormant, and extinct volcanoes in New Zealand. Kermadec Arc and Havre Trough North Island Taupō Volcanic Zone Elsewhere Mangakino Culdera South Island Other Ross Dependency New Zealand a ...
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Volcanism in New Zealand The volcanism of New Zealand has been responsible for many of the country's geographical features, especially in the North Island and New Zealand outlying islands, the country's outlying islands. While the land's volcanism dates back to before ...
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Stratigraphy of New Zealand This is a list of the units into which the rock succession of New Zealand is formally divided. As new geological relationships have been discovered new names have been proposed and others are made obsolete. Not all these changes have been unive ...
*
Auckland volcanic field The Auckland volcanic field is an area of monogenetic volcanoes covered by much of the metropolitan area of Auckland, New Zealand's largest city, located in the North Island. The approximately 53 volcanoes in the field have produced a diverse a ...
*
South Auckland volcanic field The South Auckland volcanic field, also known as the Franklin Volcanic Field, is an area of extinct monogenetic volcanoes around Pukekohe, the Franklin area and north-western Waikato, south of the Auckland volcanic field. The field contains at l ...


References

{{Reflist Monogenetic volcanic fields Geography of Waikato Landforms of Waikato Volcanism of New Zealand Geology of New Zealand Volcanoes of Waikato Auckland Volcanic Province