Sedimentation and Tectonic Setting of Early Neoproterozoic Glacial Deposits in South-Eastern Brazil

  1. Wladyslaw Altermann3 and
  2. Patricia L. Corcoran4
  1. M. A. Martins-Neto1 and
  2. C. M. Hercos1,2

Published Online: 12 MAR 2009

DOI: 10.1002/9781444304312.ch18

Precambrian Sedimentary Environments: A Modern Approach to Ancient Depositional Systems

Precambrian Sedimentary Environments: A Modern Approach to Ancient Depositional Systems

How to Cite

Martins-Neto, M. A. and Hercos, C. M. (2002) Sedimentation and Tectonic Setting of Early Neoproterozoic Glacial Deposits in South-Eastern Brazil, in Precambrian Sedimentary Environments: A Modern Approach to Ancient Depositional Systems (eds W. Altermann and P. L. Corcoran), Blackwell Publishing Ltd., Oxford, UK. doi: 10.1002/9781444304312.ch18

Editor Information

  1. 3

    Institut für Allgemeine und Angewandte Geologie, Ludwig-Maximilians-Universität München, Luisenstrasse 37, D-80333 Munich, Germany

  2. 4

    Department of Earth Sciences, Dalhousie University, Halifax, Nova Scotia, B3H 3J5, Canada

Author Information

  1. 1

    Departamento de Geologia, Escola de Minas, Universidade Federal de Ouro Preto Caixa Postal 173, 35 400–000, Ouro Preto/MG, Brazil

  2. 2

    PETROBRAS, E&P Campos Basin district, Macaé/RJ, Brazil

Publication History

  1. Published Online: 12 MAR 2009
  2. Published Print: 18 FEB 2002

ISBN Information

Print ISBN: 9780632064151

Online ISBN: 9781444304312

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Keywords:

  • sedimentation and tectonic setting of early neoproterozoic glacial deposits in south-eastern Brazil;
  • glaciogenic deposits of neoproterozoic Macaúbas megasequence, Jequitaí area, south-eastern Brazil;
  • sub-Macaúbas megasequence unconformity;
  • early neoproterozoic glacial deposits;
  • Macaúbas-Salinas basin and three depositional domains;
  • two facies associations -in cratonic and transitional domains of Macaúbas megasequence;
  • outwash-plain facies association

Summary

Glaciogenic deposits of the Neoproterozoic Macaúbas Megasequence, Jequitaí area, south-eastern Brazil, comprise two facies associations. The diamictite–sandstone–pelite facies association includes ice-proximal till, alluvial-fan and lacustrine deposits, and the outwash-plain facies association consists of proglacial fluvial sandstones. Stratigraphic, sedimentologic and structural data indicate that syn-depositional structural highs separated unique depocentres. The structural highs probably formed due to Early Neoproterozoic extensional tectonics during the break-up of Rodinia and may have been aided by plume-related doming. Tectonically induced topographic highlands may have played an important role in generating the Macaúbas glaciation.