Remarkable Geology.

Cox, SC

Four structural generations are recognised within Otago schist in a forty - five square kilometre area about the Remarkable Range, Central Otago, New Zealand.
Initially bedding was isoclinally folded and transposed, producing an axial plane schistosity during the first structural generation, throughout which quartzofeldspathic segregations developed.
During the second generation, psammitic schist of the Te Anau Assemblage was thrust over pelitic schist of the Aspiring lithologic association along a high strain zone developed at the base of the Remarkable nappe. Variations in deformation style and rotation of mesoscopic structures can be attributed to finite strain variation across the nappe: pre-existing linear features are rotated towards parallelism with the translation direction.
A broad upright synform and a north - south trending fault system developed during the third and fourth generations respectively.
Greenschist facies metamorphism accompanied development of first and second generation structures. Differences in kinetic coefficients of metamorphic reactions best accounts for variations in the abundance of zoned minerals between two adjacent isofacial regions.

vi. 58 p. ill. Photos. Map (folded in pocket). 30 cm.

1985Cox

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