Palaeogeographic Setting of Late Jurassic Manganese Mineralization in the Molango District, Mexico

  1. John Parnell,
  2. Ye Lianjun and
  3. Chen Changming
  1. J. B. Maynard1,†,
  2. P. M. Okita1,†,
  3. E. D. May1,‡ and
  4. A. Martinez-Vera2

Published Online: 3 APR 2009

DOI: 10.1002/9781444303872.ch2

Sediment-Hosted Mineral Deposits: Proceedings of a Symposium Held in Beijing, People's Republic of China, 30 July-4 August 1988

Sediment-Hosted Mineral Deposits: Proceedings of a Symposium Held in Beijing, People's Republic of China, 30 July-4 August 1988

How to Cite

Maynard, J. B., Okita, P. M., May, E. D. and Martinez-Vera, A. (1990) Palaeogeographic Setting of Late Jurassic Manganese Mineralization in the Molango District, Mexico, in Sediment-Hosted Mineral Deposits: Proceedings of a Symposium Held in Beijing, People's Republic of China, 30 July-4 August 1988 (eds J. Parnell, Y. Lianjun and C. Changming), Blackwell Publishing Ltd., Oxford, UK. doi: 10.1002/9781444303872.ch2

Editor Information

  1. Department of Geology, The Queen's University of Belfast, Belfast BT7 INN, UK

Author Information

  1. 1

    Department of Geology, University of Cincinnati 13, Cincinnati, OH 45221, USA

  2. 2

    Cia. Minera Autlan, S.A. de C.V., Mariano Escobedo 456, Mexico, DF 11590

  1. MS 954, National Center, US Geological Survey, Reston, VA 22092, USA

  2. Chevron USA, PO Box 6056, New Orleans, LA 70174, USA

Publication History

  1. Published Online: 3 APR 2009
  2. Published Print: 27 SEP 1990

ISBN Information

Print ISBN: 9780632028818

Online ISBN: 9781444303872

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Keywords:

  • Upper Jurassic rocks of east-central Mexico, host to sedimentary manganese;
  • Pre-Jurassic rocks;
  • Huizachal Formation, containing plant fossils;
  • ‘Santiago’ Formation of Cantu-C;
  • micritized ooid grainstone and oncolitic wackestone;
  • Taman Formation, consisting calcarenites of shallow-water aspect;
  • Chipoco facies, consisting peloidal wackestones;
  • Santiago Formation

Summary

A large sedimentary deposit of manganese carbonate formed during the late Jurassic in eastern Mexico. Throughout the Mesozoic, deposition in this area was in fault-bounded basins with considerable relief. Both clastic and carbonate sediment was derived from adjacent highs. The manganese ores were deposited in the slope facies of a shelf–basin transition in water deeper than storm wave base. Rocks below the ore were deposited in a euxinic basin; rocks above the ore in a more oxidizing, but still suboxic basin. Manganese was mobilized in deeper, low-oxygen water, then precipitated as manganese oxide on contact with shallower, oxygen-rich water. Manganese carbonate formed diagenetically from the manganese oxide via reduction by organic matter and iron sulphide. Because organic matter was in excess, no primary manganese oxide survived early diagenesis.