Sedimentology of the precipice sandstone, Surat Basin, Queensland

Martin, Kenneth Richard. (1977). Sedimentology of the precipice sandstone, Surat Basin, Queensland PhD Thesis, School of Physical Sciences, The University of Queensland.

       
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Author Martin, Kenneth Richard.
Thesis Title Sedimentology of the precipice sandstone, Surat Basin, Queensland
School, Centre or Institute School of Physical Sciences
Institution The University of Queensland
Publication date 1977
Thesis type PhD Thesis
Total pages 224
Language eng
Subjects 0403 Geology
Formatted abstract
The Precipice Sandstone is the basal formation in the Surat Basin and forms part of an extensive fluviatile sedimentary unit which extends from the coastal regions of south-eastern Queensland and northeastern New South Wales westward to the vicinity of Charleville in southern Queensland.

A study of sedimentary structures in both surface exposures and borehole cores indicates that the Precipice Sandstone over most of the Surat Basin was deposited by a system of low-sinuosity braided streams which flowed in a general easterly direction on a palaeoslope with a gradient of approximately 0.001. The Precipice Sandstone is a diachronous unit representing a fluviatile depositional fades which migrated in a westerly direction across the Surat Basin, Accumulation of sandstone was also influenced by differential compaction of the underlying sediments of the Bowen Basin and by contemporaneous faulting along the eastern side of the Surat Basin. The Precipice Sandstone on the Roma Ridge appears to represent the last phase of fluviatile sand deposition before lacustrine conditions extended across the entire basin with the deposition of the Evergreen Formation. Here sand deposition was from relatively sluggish, higher sinuosity, meandering streams, and the point-bar and overbank deposits give rise to a more varied sandstone than occurs elsewhere in the basin where uniformly cross-stratified, transverse bar deposits predominate.

The petrographic study of the Precipice Sandstone indicates that the sediment was derived from a wide range of igneous, metamorphic and sedimentary source rocks. The major sources for this sediment probably lay beyond the western and southwestern margins of the Eromanga Basin. K/Ar dating of muscovites from the Precipice Sandstone suggests that the Willyama Block was a possible source area.

The petrographic study and data analysis using R-Mode Factor Analysis indicate that the Precipice Sandstone has a complex diagenetic history. Internal redistribution of silica, decomposition of detrital biotite and the formation of authigenic kaolinite are the most significant diagenetic processes. Diagenetic trends are partly influenced by the grain size of the sandstone which also influences the frequency of some heavy minerals in the sandstone. Most compositional variability seen in the Precipice Sandstone from different parts of the Surat Basin may be satisfactorily explained in terms of the sequence of diagenetic events which have occurred in the rock. The presence of diagenetically-formed permeability barriers appears to have been necessary for the retention of hydrocarbons in many fields in the area of the Roma Ridge.

Keyword Sandstone -- Australia -- Surat Basin.

Document type: Thesis
Collection: UQ Theses (RHD) - UQ staff and students only
 
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