Original paper

Influence of rock avalanches upon the formation of moraines and their subsequent palaeoclimatic interpretation: a critical appraisal

Reznichenko, Natalya V.; Davies, Timothy R.H.; Shulmeister, James; Winkler, Stefan

Abstract

We provide a critical appraisal of the impact of rock avalanches on the formation of moraines, and implications for their subsequent palaeoclimatic interpretation. First we present a conceptual model of how rock avalanche deposits could influence moraine formation by mountain glaciers during the Holocene, followed by a brief literature review on empirical studies that may reveal evidence of this influence. We summarise results from our own work addressing the possible influence of rock avalanches on glaciers in the Southern Alps of New Zealand. From analysis of available techniques for de finite indication of which moraines are suitable for paleoclimatic interpretation, we suggest that future approaches must include microsedimentological studies. This is the basis for futures strategies to resolve the potential uncertainties in palaeoclimatic interpretations of moraines in tectonically active mountain ranges.

Keywords

moraine formationrock avalanchesmass balancemicrosedimentologypalaeoclimate interpretations