Kōrero: Geology – overview

Karamea Granite

Karamea Granite

Under large areas of the mountains in north-west Nelson lies coarse-grained granite, named Karamea Granite, similar to this slab. The large pink crystals (up to 2 centimetres long) are potassium feldspar; the white crystals are plagioclase feldspar; the grey glassy grains are quartz; and the black grains are biotite. These four minerals are the typical constituents of granite. Radiometric dating of Karamea Granite has shown that it formed about 375 million years ago, in the late Devonian period.

Te whakamahi i tēnei tūemi

GNS Science
Reference: SL62/9

Permission of GNS Science must be obtained before any use of this image.

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Te tuhi tohutoro mō tēnei whārangi:

Eileen McSaveney and Simon Nathan, 'Geology – overview - New Zealand’s oldest rocks', Te Ara - the Encyclopedia of New Zealand, http://www.TeAra.govt.nz/mi/photograph/8301/karamea-granite (accessed 4 June 2020)

He kōrero nā Eileen McSaveney and Simon Nathan, i tāngia i te 12 Jun 2006