North Island surface volcanism

North Island surface volcanic deposits
Stratigraphic range: Miocene, ~25–0 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Type	Igneous
Overlies	Murihiku Terrane, Caples Terrane and Waipapa Composite Terrane Greywacke, some Haast Schist near Rotoroa
Lithology
Primary	Basalt, andesite and rhyolite
Location
Coordinates	37°S 175°E / 37°S 175°E / -37; 175
Region	North Island
Country	New Zealand
Map of selected surface volcanic features in the northern North Island which includes features from volcanic activity in recorded historic times in New Zealand. 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.

Much of the volcanic activity in the northern portions of the North Island of New Zealand is recent in geological terms and has taken place over the last 30 million years. This is primarily due to the North Island's position on the boundary between the Indo-Australian and Pacific plates, a part of the Pacific Ring of Fire, and particularly the subduction of the Pacific plate under the Indo-Australian plate. The activity has included some of the world's largest eruptions in geologically recent times and has resulted in much of the surface formations of the North Island being volcanic as shown in the map.