Kinematic reconstruction of the Hastings Block, Southern New England Orogen, Australia

Jie Yan; Paul Lennox; Bryce F.J. Kelly; Robin Offler

doi:10.1071/ASEG2015ab025

24th International Geophysical Conference and Exhibition – Geophysics and Geology Together for Discovery

ISSN: 2202-0586
E-ISSN:

oa Kinematic reconstruction of the Hastings Block, Southern New England Orogen, Australia
Authors Jie Yan^a, Paul Lennox^b, Bryce F.J. Kelly^c and Robin Offler^d
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^a School of BEES, , UNSW, Sydney, 2052, , NSW, , [email protected] ^b School of BEES, , UNSW, Sydney, 2052, , NSW, , [email protected] ^c School of BEES, , UNSW, Sydney, 2052, , NSW,, [email protected] ^d NSW Institute of Frontiers GeoscienceUniversity of Newcastle, , Newcastle, 2308, , NSW, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2015, Issue 24th International Geophysical Conference and Exhibition – Geophysics and Geology Together for Discovery, Dec 2015, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2015ab025
- Published online: 01 Dec 2015

Abstract

This research project uses 3D geological modeling software to build a 3D structural surface model of the Permo-Carboniferous rocks in the northern Hastings Block (NHB). The model is being built using comprehensive strike and dip structural data and a digital elevation model. It is designed to unravel a comprehensively mapped, complexly folded, extensively faulted geological sequence where there are no well-log data. The new 3D model will enable testing of the validity of existing tectonic models, which will assist in constraining the relative timing of fault development, testing fault emplacement of the block, and verification of the number and orientation of folding events in the NHB.

Fault-block analysis has highlighted shortcomings with the existing geological map of the NHB. Fault movement history shows early movement south of the NHB and later initial movement around the northern and northeastern margins of the NHB. Fault movement termination was probably during the Hunter-Bowen Orogeny after folding of the NHB. Preliminary 2D restoration indicated the NHB was compressed (folded) and then extensively faulted.

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References

Cawood P. A. & Leitch E. C., 1985, Accretion and dispersal tectonics of the southern New England Fold Belt, eastern Australia, Tectonostratigraphic Terranes of the Circum-Pacific Region, 1, 481-492.
Cawood, P. A., Pisarevsky, S. A and Leitch, E. C., 2011, Unraveling the New England orocline, east Gondwana accretionary margin, Tectonics, 30, TC5002, doi:10.1029/2011TC002864.
Crowell, J.C., 1984, Notes to accompany lectures on tectonics, sedimentation and structural analysis of basins, Petroleum Exploration Society of Australia, 138-142.
Glen, R.A., Roberts, J., 2012, Formation of oroclines in the New England Orogen, Eastern Australia, J. Virtual Explor, 43 (Paper 3), http://dx.doi.org/10.3809/jvirtex.2012.00305.
Korsch, R. J. & Harrington, H. J., 1987, Oroclinal bending, fragmentation and deformation of terranes in the New England Orogen, eastern Australia, Terrane Accretion and Orogenic Belts, American Geophysical Union Geodynamic Series, 19, 129-140.
Lennox, P.G., Roberts, J. & Offler, R., 1999, Structural analysis of the Hastings Terrane. In Flood, P.G. ed. New England Orogen, Eastern Australia: Regional Geology, Tectonics and Metallogenesis 115-124.
Roberts, J.R., Leitch, E.C., Lennox, P.G. & Offler, R., 1995, Devonian - Carboniferous Stratigraphy of the Southern Hastings Block, eastern Australia, Australian Journal of Earth Sciences 42, 609-634.
Rosenbaum, G., Li, P. and Rubatto, D., 2012, The contorted New England Orogen (eastern Australia): new evidence from U-Pb geochronology of early Permian granitoids, Tectonics, 31, http://dx.doi.org/10.1029/2011tc002960 (TC1006).
Schmidt, P.W., Aubourg, C., Lennox, P.G. & Roberts, J., 1994, Palaeomagnetism and tectonic rotation of the Hastings Terrane, eastern Australia, Australian Journal of Earth Sciences, 41, 547-560.

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Article Type: Research Article

Keyword(s): 3D geological modelling; Fault analysis; NHB

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oa Kinematic reconstruction of the Hastings Block, Southern New England Orogen, Australia

Abstract

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