Hauhungatahi

{{Infobox mountain | name = Hauhungatahi | photo = Hauhungatahi, New Zealand 04.JPG | photo_caption = Hauhungatahi seen from Mount Ruapehu | elevation_m = 1521 | elevation_ref = | prominence = approx | map = New Zealand North Island | map_caption = | label_position = right | listing = | language = Māori | location = North Island, New Zealand | range = | coordinates = | range_coordinates = | coordinates_ref = | topo = nz49931 | type = stratovolcano | volcanic_zone = Taupō Volcanic Zone | last_eruption = | first_ascent = | easiest_route = Tramping from the west, starting near Erua | map_image ={{#tag:mapframe|[,,{ "type": "Feature", "properties": { "marker-size": "small", "marker-color": "#ff0000", "marker-symbol": "volcano", "title": "Hauhungatahi" }, "geometry": {"type": "Point", "coordinates":[175.444167, -39.229444]} }] | frameless =1 | align =center |text=Map of volcanic features near Hauhungatahi (red marker). Surface volcanic deposits are shaded. To its immediate east are Mount Ruapehu and Mount Tongariro with their recent vents active in the last 15,000 years shaded , with craters in . Lakes in vents are outlined in . To its north east is Lake Rotoaira and beyond that the andesitic deposits of Pihanga. Rhyolitic ignimbrite surface deposits to the north of the map are from eruptions of the Taupō Volcano. |width=250 |height=250 |latitude=-39.229444 |longitude=175.444167 |icon=no |zoom=9 }} | age= }} Hauhungatahi is an eroded andesitic volcano at the southern end of the Taupō Volcanic Zone in New Zealand, located about north–west of Mount Ruapehu. Although relatively little-known, at Hauhungatahi is one of the highest volcanoes in New Zealand, exceeded in elevation by only Ruapehu, Taranaki/Egmont (including Fanthams Peak), and the Tongariro massif (including Ngauruhoe). It is part of the Tongariro National Park.

== Geology == The volcano is constructed atop an upfaulted block of Mesozoic marine sediments. The age of the erupted lava near the youngest cone is about 900,000 years, making Hauhungatahi more than three times as old as the neighbouring Ruapehu. The oldest rocks sampled have not given definite ages but are possibly up to 1.2 million years old. Most samples are basaltic andesite but some of the younger lavas are andesite. The rock composition and age is more similar to Titiraupenga and Pureora in the western region of the Taupō Volcanic Zone than the nearby Ruapehu.