Geology Of The Auckland Area 1:250 Book #2
Listed in category: New Zealand → Geological Maps (NZ)
$30.00
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74 pages
Book with 1:250 000 scale map at back
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This full colour, large format geological map illustrates the geology of the greater Auckland area (North Island, New Zealand), including Coromandel Peninsula, at a scale of 1:250 000. The map is part of a new series initiated in 1996 which covers the whole of the country.
Onshore geology, offshore bathymetry and major structural elements are shown, derived from published and unpublished mapping by the Institute of Geological & Nuclear Sciences and its predecessor the New Zealand Geological Survey, university staff and students, exploration company geologists, and NIWA. All geological map data are held in a geographic information system and are available in digital form, and as thematic maps at various scales. The accompanying 74 page, fully illustrated text summarises the geology and tectonic development of the Auckland region, and highlights some aspects of its economic and engineering geology, and potential geological hazards.
The map area is underlain, onshore and offshore, by Triassic to Early Cretaceous basement terranes. Late Cretaceous rift deposits overlie basement and are overlain by a thick succession of Cretaceous and Cenozoic marine sedimentary and volcanic rocks, in the area offshore of the present west coast. Onshore, Late Eocene terrestrial rocks, Oligocene and Early Miocene predominantly marine sedimentary rocks, and Pliocene to Holocene terrestrial and shallow marine sediments overly basement successively. Thrust-bounded units of Cretaceous to Oligocene rocks (Northland Allochthon) were emplaced from the northeast in Early Miocene time, contemporaneous with eruption of andesitic stratovolcanoes. Early Miocene to Holocene eruption of rhyolitic, dacitic, andesitic and basaltic volcanoes formed much of the Coromandel Peninsula, Great Barrier Island, the Waitakere Ranges, Little Barrier Island, Mayor Island and the distinctive volcanic landscape of Auckland City and South Auckland.