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Punctuated eustatic sea-level rise in the early mid-Holocene

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Author(s)

Michael I. Bird, William E. N. Austin, Christopher M. Wurster, L. Keith Fifield, Meryem Mojtahid, Chris Sargeant

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Abstract

Whether eustatic sea-level rise through the Holocene has been punctuated or continuous has remained controversial for almost two decades. Resolving this debate has implications for predicting future responses of remaining ice sheets to climate change and also for understanding the drivers of human settlement and dispersal patterns through prehistory. Here we present a sea-level curve for the past 8900 yr from Singapore, a tectonically stable location remote from ice-loading effects. We also present critical and unique sedimentation rate, organic delta C-13, and foraminiferal delta C-13 proxy records of sea-level change derived from a shallow-marine sediment core from the same area over the same time interval. The sea-level curve, corroborated by the independent proxy records, suggests rapid rise at a rate of 1.8 m/100 yr until 8100 cal (calibrated) yr B.P., a near cessation in the rate of sea-level rise between 7800 and 7400 cal yr B.P., followed by a renewed rise of 4-5 m that was complete by 6500 cal yr B.P. We suggest that this period of relatively stable sea level during the early to mid-Holocene enabled modern deltas to advance, providing a highly productive environment for the establishment of coastal sedentary agriculture. Periods of rapid sea-level rise before and after may have catalyzed significant postglacial episodes of human dispersal in coastal regions.

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Original languageEnglish
Pages (from-to)803-806
Number of pages4
JournalGeology
Volume38
Issue number9
DOIs
StatePublished - Sep 2010

    Research areas

  • LAURENTIDE ICE-SHEET, HOLOCENE DEGLACIATION, RIVER DELTA, INITIATION, TAHITI, RECORD, EVENT, REEF

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