LATE QUATERNARY GEOLOGICAL HISTORY OF RIO GRANGE DO SUL COASTAL PLAIN , SOUTHERN BRAZIL

  • Tomazelli L
  • Dillenburg S
  • Villwock J
  • 25

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Abstract

See, stats, and : https : / / www . researchgate . net / publication / 228490100 Late Grande , southern Article CITATIONS 72 READS 150 3 , including : Some : Climatic Australia , and Luiz Universidade 49 SEE Sergio Universidade 101 , 135 SEE All . The . All - text and , letting . ABSTRACT The sedimentary deposits and geomorphic features preserved in the Rio Grande do Sul coastal plain , southern Brazil , represent a significant record of late Quaternary climatic changes with its associated glacio - eustatic sea - level fluctuations . The sediments of the coastal plain belong to two major depositional systems - an alluvial fan system developed along the inner part of the coastal plain and a barrier - lagoon complex with four distinctive transgressive - regressive cycles seaward . The alluvial fan sediments were derived from igneous and metamorphic rocks of the Precambrian shield and from sedimentary and volcanic rocks of the Paraná Basin . Subsequently , they were reworked by four barrier - lagoon systems each representing a transgressive - regressive cycle . Each barrier probably originated at the landward limit of a transgression and was preserved due to regression of the shoreline forced by a glacio - eustatic sea - level fall . The four barrier - lagoon systems are believed to have formed during the last 400 ka assuming a correlation with the highstands represented by the last major peaks of the oxygen isotopic record . INTRODUCTION The Rio Grande do Sul coastal plain is an elongate (620 km)andwide(upto100km)physiographicprovinceunderlainbythePelotasBasin.Thisbasin,thesouthernmostoftheBraziliancontinentalmargin,hasaccumulatedmorethan10,000mofmainlyterrigenoussedimentssinceitsformationintheEarlyCretaceous,whentheSouthAtlanticbeganopening.TheyoungersectionofthissedimentaryrecordisnowexposedontheRioGrandedoSulcoastalplainandcontainsoneofthemostcompleterecordsofBraziliancoastalQuaternarysedimentation(Fig.1).ThispapersummarizesknowledgeaboutRioGrandedoSulcoastalplainsedimentsandsuggestsanevolutionarymodelforthemduringtheQuaternary.PHYSICALANDGEOLOGICALSETTINGOFTHESTUDYAREAThecoastalplainofRioGrandedoSulhasanearlystraightshorelinebetweenabout29°Sand34°Slatitude.Coveringanareaofabout33,000km

Author-supplied keywords

  • 620 km
  • and wide
  • basin
  • coastal evolution
  • coastal plain
  • do sul coastal plain
  • elongate
  • introduction the rio grande
  • is an
  • physiographic province
  • quaternary geology
  • rio grande do sul
  • sea-level variations
  • the southernmost of the
  • this basin
  • underlain by the pelotas
  • up to 100 km

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Authors

  • Luiz Jose Tomazelli

  • Sergio Rebello Dillenburg

  • Jorge Alberto Villwock

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