Holocene landscape evolution of the Havelock and upper Rangitata valleys, South Canterbury, New Zealand

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SR_2003-022-pdf
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Forsyth, P.J.; Barrell, D.J.A.; Basher, L.R.; Berryman, K.R. 2003 Holocene landscape evolution of the Havelock and upper Rangitata valleys, South Canterbury, New Zealand . Lower Hutt: Institute of Geological & Nuclear Sciences. Institute of Geological & Nuclear Sciences science report 2003/22 45 p.

Abstract: Erosion in the Havelock Valley and upper Rangitata River is dominated by fluvial and mass movement processes. Active floodplains, alluvial fans and debris cones are prominent features of the landscape. Several rock avalanche deposits also occur in the area. A search for dateable deposits yielded materials and surfaces whose ages were estimated by several methods. Weathering rind ages ranged from 10,000 to 297 ± 75 years, and calibrated radiocarbon ages from 14,941 ± 712 to 151 ± 146 years BP. . Lower Hutt: Institute of Geological & Nuclear Sciences. Rhizocarpon species lichen measurements yielded various ages depending on which lichen growth curve was used, but are probably useful only for surfaces up to about 250 years old. Buried and surface soil characteristics, though not giving a numerical age, were generally consistent with ages derived by other methods. The dated deposits record periods of stability separated by episodes of aggradation. However, the hypothesis that Alpine Fault earthquakes may create visible signals in the landscape was not confirmed. Rock avalanche deposits, alluvial fans and debris cones were examined, and yielded various types of age data, but none were related with certainty to known earthquake events. (auth)