Stratigraphy and evolution of a prograded transgressive dunefield barrier in southern Brazil

S. R. Dillenburg, L. J. Tomazelli, P. A. Hesp, E. G. Barboza, L. C.P. Clerot, D. B. Da Silva

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

The study of the stratigraphy and evolution of the Holocene barrier of Curumim in Southern Brazil was based on air photograph, lithofacies analyses, and radiocarbon dating. Lithologic data, with emphasis on sediment color, texture and compaction, and molluscan assemblages were obtained from trenches and from 4 drill holes, 18 m long on average, performed by a percussion system over the 5 km wide barrier of Curumim. Barrier stratigraphy shows a regressive nature, with an eolian facies (transgressive dunes mainly) covering a beach facies embracing backshore, foreshore and shoreface sands. The Holocene barrier of Curumim started to prograde at around 7 ka, due to a positive imbalance in the sediment budget, when the sea level was still rising close to the end of the Postglacial Marine Transgression. The identification of the maximum altitude of the beach facies during progradation made possible to estimate a maximum sea level of approximately 2.5 m occurred between 6.7 and 5.2 ka. The morphology of the barrier comprises relatively wide coast-parallel ridges, which were formed by multiple phases of dune transgression (transgressive dunefields).

Original languageEnglish
Pages (from-to)132-135
Number of pages4
JournalJournal of Coastal Research
Volume1
Issue numberSpecial 39
Publication statusPublished - 1 Jan 2006
Externally publishedYes

Keywords

  • Coastal barrier
  • Holocene
  • Sediment budget

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