Recognition and Significance of Paludal Dolomites: Late Mississippian, Kentucky, USA

  1. Sadoon Morad,
  2. J. Marcelo Ketzer and
  3. Luiz F. De Ros
  1. A.J. Barnett1,
  2. V.P. Wright2 and
  3. S.F. Crowley3

Published Online: 22 MAY 2013

DOI: 10.1002/9781118485347.ch19

Linking Diagenesis to Sequence Stratigraphy

Linking Diagenesis to Sequence Stratigraphy

How to Cite

Barnett, A.J., Wright, V.P. and Crowley, S.F. (2013) Recognition and Significance of Paludal Dolomites: Late Mississippian, Kentucky, USA, in Linking Diagenesis to Sequence Stratigraphy (eds S. Morad, J. M. Ketzer and L. F. De Ros), John Wiley & Sons, Inc., West Sussex, UK. doi: 10.1002/9781118485347.ch19

Author Information

  1. 1

    Department of Earth Sciences, Cardiff University, Main Building, Park Place, Cardiff, CF10 3YE, UK

  2. 2

    BG Group, 100 Thames Valley Park Drive, Reading, RG6 1PT, UK; E-mail: andrew.barnett@bg-group.com

  3. 3

    Department of Earth Sciences, University of Liverpool, Liverpool, L69 3BX, UK

Publication History

  1. Published Online: 22 MAY 2013
  2. Published Print: 11 JAN 2013

ISBN Information

Print ISBN: 9781118485392

Online ISBN: 9781118485347

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Keywords:

  • coastal marshes;
  • floodplain deposits;
  • isotopes;
  • paludal dolomites;
  • sedimentology;
  • sequence stratigraphy;
  • sub-aerial exposure; USA

Summary

Orange to tan weathering ferroan dolomites associated with palaeosols are a volumetrically minor but conspicuous feature of cyclic late Mississippian (Brigantian) icehouse ramp successions in Kentucky, eastern USA. The ferroan dolomites have sharp bases and tops and are intercalated with pedogenic units (e.g. calcretes) or floodplain deposits. Sedimentological and C/O stable isotope data suggest that the dolomiteswere formed in brackish or schizohaline coastal marsh (paludal) environments. This chapter establishes the origin of these ferroan dolomite beds, documents their sequence stratigraphic significance, and draws attention to a potentially wide-spread but rarely documented sub-aerial exposure feature. Paludal dolomite beds associated with well-developed palaeosols and major (Myr-scale) disconformities probably reflect depressed Milankovitch band sea-level oscillations that occurred during third-order lowstands.