Segmentation and fault-monocline relationships in the Lapstone Structural Complex, Sydney Basin, New South Wales

The 95 km-long Lapstone Structural Complex is a segmented structural association consisting of north-trending faults and monoclines in the western Sydney Basin between the Cumberland Basin to the east and lower Blue Mountains to the west. It has developed in a compressional regime. At depth, the Lap...

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Bibliographic Details
Published in:Australian journal of earth sciences 2023-04, Vol.70 (3), p.375-392
Main Authors: Fergusson, C. L., Hatherly, P. J.
Format: Article
Language:English
Subjects:
Basins
Cenozoic
Cenozoic Era
Cretaceous
Depth
Dipping
fault segmentation
fault-propagation fold
Faults
Geological faults
Gravel
imbricate faults
monocline
Mountains
Propagation
Seismic activity
Sydney Basin
thrust fault
Thrust faults
Uplift
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Summary:The 95 km-long Lapstone Structural Complex is a segmented structural association consisting of north-trending faults and monoclines in the western Sydney Basin between the Cumberland Basin to the east and lower Blue Mountains to the west. It has developed in a compressional regime. At depth, the Lapstone Structural Complex is most likely a deeply penetrating, west-dipping thrust fault that is seismogenic in the brittle middle crust. This structure has propagated upwards into the overlying Sydney Basin in the top ∼3 km of the crust and formed a suite of distinct fault and fault-monocline structures, including: (a) in the north, inferred imbricate faults at depth in the lower Sydney Basin dying out upwards into a well-displayed, major east-facing monocline (central limb has an overall consistent
ISSN:0812-0099
1440-0952
DOI:10.1080/08120099.2023.2148187