Carbonate platform sequence stratigraphy in a rapidly subsiding area: The Late Barremian-Early Aptian of the Organyà basin, Spanish Pyrenees

Josep M. Bernaus, Annie Arnaud-Vanneau, Esmeralda Caus

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47 Citations (Scopus)

Abstract

A detailed sedimentological and stratigraphical study of the Late Barremian-Early Aptian Urgonian Carbonate platform of the Organyà basin, Spanish Pyrenees, has identified four depositional sequences. The first two sequences consist of transgressive and highstand systems tracts and the last two sequences of lowstand, transgressive and highstand systems tracts. Sequence boundaries at the top of sequences OR-1 and OR-4 are type 1 boundaries with evidence of exposure and erosion. Sequence boundaries at the top of sequences OR-2 and OR-3 are type 2 with no evidence of exposure or erosion. Sand-shoal (high-energy) facies characterise the first sequence, OR-1. Sequences OR-2 and OR-3 are dominated by lagoonal facies, with an important accumulation of lacustrine facies at the base of OR-3. A succession of lacustrine, deep-platform and sand-shoal facies characterises sequence OR-4. The last sequence also contains the record of an anoxic event (OAE 1a). All these characteristics have been largely influenced by the high subsidence rate of the Organyà basin (1100 m of compacted limestone deposited in about 5 Ma). However, the main global eustatic changes registered in other contemporaneous basins were also identified. © 2002 Elsevier Science B.V. All rights reserved.
Original languageEnglish
Pages (from-to)177-201
JournalSedimentary Geology
Volume159
DOIs
Publication statusPublished - 15 Jul 2003

Keywords

  • Aptian
  • Barremian
  • Carbonate platform
  • Lower Cretaceous
  • Sequence stratigraphy
  • Spain

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