Geology and neotectonics of the upper Manuherikia Basin, Central Otago, New Zealand

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Madin, I. 1988 Geology and neotectonics of the upper Manuherikia Basin, Central Otago, New Zealand. Lower Hutt: New Zealand Geological Survey. Record / New Zealand Geological Survey 27 32 p.

Abstract: The upper Manuherikia Basin is one of several reverse-fault bounded in the Central Otago province. It is bounded to the north-west by the north- east-trending Dunstan Mountains and Dunstan Fault Zone and to the north by the St Bathans Range along the north-west-trending Blue Lake Fault, and the Hawkdun Range along the north-west-trending Hawkdun Fault. Neogene movement on the three faults disrupted an originally horizontal sequence of Miocene terrestrial sediments deposited on a peneplane cut in schist and greywacke basement. Faulting started in the Pliocene along the Hawkdun Fault and was accompanied by widespread deposition of Maori Bottom Formation sediment, shed off the rising range front. Subsequent uplift of the Dunstan and St Bathans Ranges was accompanied by deposition of the Vinstan Gravel, a newly recognised unit. Late Quaternary pediment surfaces are developed throughout the basin and 6 ages are recognised. They are correlated with terrace surfaces mapped in the lower Manuherikia Basin and range in age from modern floodplains to approximately 65 ka. ... The north-west-trending Hawkdun Range was the first to be uplifted but is currently inactive. The later north-east-trending Dunstan and north-west-trending St Bathans Range are both currently active. This suggests that the two trends of ranges in the basin and range province may result from contemporaneous uplift guided by pre-existing structure, instead of by the shift in orientation of the stress field over time.

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