Karst Bauxites: Interfingering of Deposition and Palaeoweathering

  1. Médard Thiry and
  2. Régine Simon-Coinçon
  1. G. Bardossy1 and
  2. P.-J. Combes2,3

Published Online: 14 APR 2009

DOI: 10.1002/9781444304190.ch7

Palaeoweathering, Palaeosurfaces and Related Continental Deposits

Palaeoweathering, Palaeosurfaces and Related Continental Deposits

How to Cite

Bardossy, G. and Combes, P.-J. (1995) Karst Bauxites: Interfingering of Deposition and Palaeoweathering, in Palaeoweathering, Palaeosurfaces and Related Continental Deposits (eds M. Thiry and R. Simon-Coinçon), Blackwell Publishing Ltd., Oxford, UK. doi: 10.1002/9781444304190.ch7

Author Information

  1. 1

    Hungarian Academy of Sciences, Budapest, Hungary H-1387

  2. 2

    University of Montpellier II, case 66, Geology of Ore deposits, Place Eugène Bataillon, 34095 Montpellier, Cedex 05, France

  3. 3

    CNRS URA n°1405, France

Publication History

  1. Published Online: 14 APR 2009
  2. Published Print: 26 MAY 1995

ISBN Information

Print ISBN: 9780632053117

Online ISBN: 9781444304190

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Keywords:

  • karst bauxite deposits, important indicator;
  • karst bauxite deposits - relating to shallow, marine carbonate-platform sediments;
  • oldest karst bauxite deposits, Eastern Sayab Mountains;
  • residual and aphanitic textures, characterizing lateritic bauxites;
  • clastic bauxites, exhibiting stratification;
  • continental weathering of magmatic and metamorphic rocks, consuming atmospheric carbon dioxide

Summary

This article presents the main data for the characterization of karst bauxites, starting with the different types of classification and followed by the distribution of the deposits in space and time. A short review is presented about the main geochemical and mineralogical features of the karst bauxites. The particular importance of the lithological and sedimentological features of karst bauxites is emphasized. The position of bauxite deposits within sedimentary sequences is analysed and compared with palaeogeographical reconstructions. These new approaches allow the reconstruction of the main scenarios leading to the formation of bauxite deposits: autochthonous, parautochthonous, allochthonous and parallochthonous. In the following a simple typology is presented, based on palaeogeography and the tectonic position of the deposits, and demonstrated by some of the most representative examples. The attention is focused on karst bauxites as geodynamic indicator rocks, with respect to palaeoclimate, eustatic movements and tectonic instability. Thus the bauxites, particularly the karst bauxite deposits, must be considered as essential indicators in the reconstruction of the external geodynamic processes. Finally, the new approaches and methods that elaborate the origin of karst bauxite deposits also can be applied successfully to the exploration of new deposits.