Regional Loss of SiO2 and CaCO3, and Gain of K2O during Burial Diagenesis of Gulf Coast Mudrocks, USA

  1. Richard H. Worden2 and
  2. Sadoon Morad3
  1. L. S. Land and
  2. K. L. Milliken

Published Online: 17 MAR 2009

DOI: 10.1002/9781444304237.ch13

Quartz Cementation in Sandstones

Quartz Cementation in Sandstones

How to Cite

Land, L. S. and Milliken, K. L. (2009) Regional Loss of SiO2 and CaCO3, and Gain of K2O during Burial Diagenesis of Gulf Coast Mudrocks, USA, in Quartz Cementation in Sandstones (eds R. H. Worden and S. Morad), Blackwell Publishing Ltd., Oxford, UK. doi: 10.1002/9781444304237.ch13

Editor Information

  1. 2

    School of Geosciences, The Queen's University, Belfast, BT7 1NN, UK

  2. 3

    Sedimentary Geology Research Group, Institute of Earth Sciences, Uppsala University, Norbyvägen 18 B, S–75236, Uppsala, Sweden

Author Information

  1. Department of Geological Sciences, University of Texas at Austin, Austin TX 78713, USA

Publication History

  1. Published Online: 17 MAR 2009
  2. Published Print: 3 MAR 2000

ISBN Information

Print ISBN: 9780632054824

Online ISBN: 9781444304237

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Keywords:

  • regional loss of SiO2 and CaCO3 and gain of K2O during burial diagenesis of Gulf Coast mudrocks, USA;
  • chemical evidence for SiO2 loss;
  • petrographic evidence for SiO2 gain/loss;
  • CaO loss during burial;
  • source of quartz cement in associated sandstones

Summary

Ten of 11 wells from the onshore Texas portion of the Tertiary Gulf of Mexico sedimentary basin for which whole-rock analyses are available exhibit loss of SiO2 relative to Al2O3, and in three of the wells SiO2/Al2O3 ratios decrease with increasing depth. At least some mudrocks lose SiO2 during burial diagenesis, and mudrocks seem to be a sufficient source for the quartz cement in Gulf Coast Tertiary sandstones. Most wells are also characterized by loss of Ca (as CaCO3) and some display gain in K2O. Burial diagenesis of mudrocks is an open chemical process in which all mudrocks lose some components, and some mudrocks gain components as well.