Kōrero: Geology – overview

Marlborough schist (1 o 2)

Marlborough schist

Under large areas of Otago and smaller areas of Marlborough lies schist, similar to the rock illustrated here from Queen Charlotte Sound. Schist is a metamorphic rock that has been deeply buried, heated and recrystallised, so that it breaks along a preferred direction (called the schistosity). During recrystallisation the minerals have often been segregated into dark and light layers. The light layers are made of quartz and feldspar, while the darker layers are mainly minerals such as chlorite and biotite.

Such layered or banded metamorphic rocks are usually called gneiss overseas – the term schist is a New Zealand peculiarity.

Te whakamahi i tēnei tūemi

GNS Science
Reference: CN47597/4
Photograph by Lloyd Homer

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

Ngā whakaahua me ngā rauemi katoa o tēnei kōrero

Te tuhi tohutoro mō tēnei whārangi:

Eileen McSaveney and Simon Nathan, 'Geology – overview - Disturbances on the edge of Gondwana', Te Ara - the Encyclopedia of New Zealand, http://www.TeAra.govt.nz/mi/photograph/8310/marlborough-schist (accessed 24 June 2024)

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