- Title
- The structural evolution of the Northern Hastings Block and southern Nambucca Block, southern New England Orogen, eastern Australia
- Creator
- Yan, J.; Lennox, P. G.; Offler, R.
- Relation
- Australian Journal of Earth Sciences Vol. 64, Issue 7, p. 871-887
- Publisher Link
- http://dx.doi.org/10.1080/08120099.2018.1382573
- Publisher
- Taylor & Francis
- Resource Type
- journal article
- Date
- 2017
- Description
- The Hastings Block is a weakly cleaved and complexly folded and faulted terrain made up of Devonian, Carboniferous and Permian sedimentary and volcanic rocks. The map pattern of bedding suggests a major boundary exists that divides the Hastings Block into northern and southern parts. Bedding north of this boundary defines an upright box-like Parrabel Anticline that plunges gently northwest. Four cleavage/fold populations are recognised namely: E-W-striking, steeply dipping cleavage S₁ that is axial surface to gently to moderately E- or W-plunging; F₁ folds that were re-oriented during the formation of the Parrabel Anticline with less common N-S-trending, steeply dipping cleavage S₂, axial surface to gently to moderately N-plunging F₂ folds; poorly developed NW-SE-striking, steeply dipping cleavage S₃ axial surface to mesoscopic, mainly NW-plunging F₃ folds; and finally , a weakly developed NE-SW-striking, steeply dipping S₄ cleavage formed axial surface to mainly NE-plunging F₄. The Parrabel Anticline is considered to have formed during the D₃ deformation. The more intense development of S₂ and S₃ on the western margin of the Northern Hastings Block reflects increasing strain related to major shortening of the sequences adjacent to the Tablelands Complex during the Hunter-Bowen Orogeny. The pattern of multiple deformation we have recorded is inconsistent with previous suggestions that the Hastings Block is part of an S-shaped orocline folded about near vertically plunging axes.
- Subject
- Northern Hastings Block; ductile deformation; folds; cleavages; structural history; Nambucca Block; oroclines
- Identifier
- http://hdl.handle.net/1959.13/1393861
- Identifier
- uon:33623
- Identifier
- ISSN:0812-0099
- Language
- eng
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