Cyclone frequency during the last 5000 years at Curacoa Island, north Queensland, Australia

Matthew Hayne, John Chappell*

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    86 Citations (Scopus)

    Abstract

    A series of storm deposits at Curacoa Island, a steep bedrock island in the Palm Group, north Queensland, record the passage of cyclonic events. Storm ridge accretion occurs when cyclonic waves and surge combine to transport coarse sediment, mostly broken coral, onto the shore and deposit it above normal tidal levels. Narrow fringing reefs at Curacoa act as a rapidly replenished sediment source, augmented by lithic gravel transported longshore. Beachface, stormberm, ridge platform and washover deposits can accrete during a single event. A series of storm ridges were examined via stratigraphic pits and trenches on two traverses; deposits from 22 events were identified and their ages were determined using 68 radiocarbon dates from coral clasts. Most dates from each storm deposit formed statistically accordant groups. Only 15% of the dates were older than the group ages and were interpreted as reworked specimens. Accordant ages within each group were combined and converted to calibrated radiocarbon ages. Ridge ages decrease uniformly with distance from the oldest ridge, indicating uniform depositional processes over the last 5000 years. A time series of storm deposit ages indicates that cyclone frequency was statistically constant over the last 5000 years. This suggests that cyclone frequency may not have been affected by sea surface temperatures in the region, which appear to have been about 1°C warmer about 5000 years ago.

    Original languageEnglish
    Pages (from-to)207-219
    Number of pages13
    JournalPalaeogeography, Palaeoclimatology, Palaeoecology
    Volume168
    Issue number3-4
    DOIs
    Publication statusPublished - 15 Apr 2001

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