Polyphased Quartz Cementation and Its Sources: A Case Study from the Upper Palaeozoic Haushi Group Sandstones, Sultanate of Oman

  1. Richard H. Worden2 and
  2. Sadoon Morad3
  1. B. H. Hartmann,
  2. K. Juhász-Bodnár,
  3. K. Ramseyer and
  4. A. Matter

Published Online: 17 MAR 2009

DOI: 10.1002/9781444304237.ch17

Quartz Cementation in Sandstones

Quartz Cementation in Sandstones

How to Cite

Hartmann, B. H., Juhász-Bodnár, K., Ramseyer, K. and Matter, A. (2000) Polyphased Quartz Cementation and Its Sources: A Case Study from the Upper Palaeozoic Haushi Group Sandstones, Sultanate of Oman, in Quartz Cementation in Sandstones (eds R. H. Worden and S. Morad), Blackwell Publishing Ltd., Oxford, UK. doi: 10.1002/9781444304237.ch17

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. Geologisches Institut, Universität Bern, Baltzerstrasse 1, CH-3012 Bern, Switzerland

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:

  • polyphased quartz cementation and its sources - Upper Palaeozoic Haushi group sandstones;
  • Interior Oman Sedimentary Basin (IOSB);
  • Haushi group sediments;
  • burial and thermal history of basin - reconstructed using PetroMod;
  • polyphased quartz cementation;
  • fluid inclusion microthermometry;
  • smectite to illite transformation in mixed-layer clay minerals;
  • authigenic quartz precipitation

Summary

The late Westphalian to early Artinskian Haushi Group in the Interior Oman Sedimentary Basin consists of the glaciogenic Al Khlata Formation and the Gharif Formation, which contains marginal marine, coastal plain and fluvial sediments. Due to a geographically varied subsidence history, the sediments presently range from outcrop in the south-east to almost 5000 m in the north-west of the study area, representing maximum burial. This favourable geological setting provides a detailed picture of the genesis of authigenic quartz over a wide depth range.

Authigenic quartz formed as zoned syntaxial overgrowths on detrital quartz. It varies from trace amounts in outcrop samples to almost 25 vol% in sandstones buried over 4000 m. Evidence from cathodoluminescence, fluid inclusion microthermometry, and stable isotopes supports a multistage origin of authigenic quartz.

A detailed study of the diagenetic sequence reveals that dissolution of aluminosilicates, pressure solution and stylolitization are the major silica-providing processes in the Haushi Group sandstones. Meteoric infiltration along the basin margins is responsible for intense dissolution of aluminosilicates during shallow burial, contributing to quartz precipitation. Transformation of smectite to illite in mixed-layer clay minerals, supplies silica with progressive burial. However, the composition–depth curve of the mixed-layer clay minerals shows an abrupt increase in illite content at 1500 m, supplying a pulse of silica at that depth. Pressure solution and stylolitization are responsible for most of the observed quartz cement. A marked increase in pressure solution at 2600 m corresponds with an increase in authigenic quartz at the same depth. Illitization of kaolinite supplies minor amounts of silica at temperatures above 100°C.