Structural Evolution of the Thirlmere and Mount Tomah Monoclines: Southern Sydney Basin NSW

Timothy McMillan; Titus Murray; Dr. Wendy Timms

doi:10.1071/ASEG2018abP025

1st Australasian Exploration Geoscience Conference – Exploration Innovation Integration

ISSN: 2202-0586
E-ISSN:

oa Structural Evolution of the Thirlmere and Mount Tomah Monoclines: Southern Sydney Basin NSW
Authors Timothy McMillan^a, Titus Murray^b and Dr. Wendy Timms^c
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^a University of New South Wales, OMB, 159 Barker St, Randwick, NSW, [email protected] ^b Fault Seal, 7/66 Hunter St, Sydney, NSW, 2000, [email protected] ^c University of New South Wales, OMB, 159 Barker St, Randwick, NSW, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2018, Issue 1st Australasian Exploration Geoscience Conference – Exploration Innovation Integration, Dec 2018, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2018abP025
- Published online: 01 Dec 2018

Abstract

The Southern Sydney Basin is a geological region of sub-horizontal conforming strata, including significant coal measures that have been mined for over 100 years. This apparently simple ‘layer-cake’ geology has overlooked many complexities associated with intrusions and a variety of geological structures. This over-simplification of geology has contributed to uncertainty in groundwater model outcomes, and impacts to surface hydrology and groundwater systems that have occurred at some sites. The aim of this study was to identify and characterize geological complexities within the Southern Sydney Basin with a particular focus on near surface groundwater and wetlands which could be sensitive to these direct or indirect disturbances.

An initial desk top review of existing drill-hole data, outcrop maps and typical spatial data was undertaken to highlight areas of possible structural inconsistency and areas with a high probability of faults or other structures such as monoclines. This data was then used in combination with field based geological mapping and high quality digital terrain modelling to assist the current development of a series of kinematic (geologically restored) cross-sections.

This has enabled the preliminary modelling of fault propagation folds associated with the inversion of growth faults, which will be important in the development of a framework to better identify and define the geometry of aquitards, associated with the Thirlmere Lakes and groundwater surface expression dependent ecosystems (swamps) over the Southern Sydney Basin. This greater understanding of the features around the Thirlmere Lakes area will lead to the development of a structural evolution model that further explains the incision of Blue Gum Creek and the development of Thirlmere Lakes within an entrenched meander.

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References

GHD Geotechnics (2013). Tahmoor Subsidence Management - Fault Slide 4 in MSR Deviation, chg 92km880, memorandum, 11 June.
Tonkin, C. and Timms, W. (2015). Geological Structures and Fault-infill in the Southern Coalfields and Implications for Groundwater Flow. Journal of Research Projects Review: 49.
Colquhoun, G. P., Phillips, G., Hughes, K. S., Deyssing, L., Fitzherbert, J. A. and Troedson, A. L. (2015). New South Wales Zone 56 Seamless Geology. M. Geological Survey of New South Wales, Geological Survey of New South Wales.
Land and Property Information (2016). LiDAR Data Forward Program.
Stroud, W. J., Sherwin, L., Roy, H. N. and Baker, C. J. (1885). Wollongong - PortHacking 1:100000 Geological Sheet 9029-9129. Sydney, Geological Survey of New South Wales.
Moffitt, R. (1998). A Compilation of the Southern Coalfield 1:100,000. Revised in 2000. Explanatory Notes.
Fergusson, C. L. (2006). Review of structure and basement control of the lapstone structural complex, Sydney basin, eastern New South Wales. A. C. Hutton & J. Griffin (Eds.), Proceedings of the Thirty Sixth Sydney Basin Symposium on “Advances in the study of the Sydney Basin”: 45-50.
Bray, A., Hatherly, P. and Fergusson, C. L. (2010). Seismic reflection evidence for the evolution of the Camden Syncline and Lapstone Structural Complex, central Sydney Basin, Australia. Australian Journal of Earth Sciences 57(7): 993-1004.
Fergusson, C. L., Bray, A. and Hatherly, P. (2011). Cenozoic development of the lapstone structural complex, Sydney Basin, New South Wales. Australian Journal of Earth Sciences 58(1): 49-59.
Och, D. J., Offler, R., Zwingmann, H., Braybrooke, J. and Graham, I. T. (2009). Timing of brittle faulting and thermal events, Sydney region: association with the early stages of extension of East Gondwana. Australian Journal of Earth Sciences 56(7): 873887.
Och, D. J., Offler, R. and Zwingmann, H. (2014). Constraining timing of brittle deformation and fault gouge formation in the Sydney Basin. Australian Journal of Earth Sciences 61(3): 337-350.
Rajabi, M., Tingay, M. and Heidbach, O. (2016). The present-day stress field of New South Wales, Australia. Australian Journal of Earth Sciences 63(1): 1-21.
Ross, J. B. (2014). Groundwater resource potential of the Triassic Sandstones of the Southern Sydney Basin: an improved understanding. Australian Journal of Earth Sciences 61(3): 463-474.

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Article Type: Research Article

Keyword(s): Hydrogeology; Mt Tomah Monocline; Structural Geology; Sydney Basin; Thirlmere Monocline

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oa Structural Evolution of the Thirlmere and Mount Tomah Monoclines: Southern Sydney Basin NSW

Abstract

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