Structural development of the Hastings Block and tectonic implications for the southern New England Orogen
Creators: name: J. Yan
name: P. G. Lennox
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Biochemistry
subject: Space Science
subject: Medicine
subject: Cell Biology
subject: Molecular Biology
subject: Pharmacology
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: FOS: Chemical sciences
subject: Sociology
subject: FOS: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: FOS: Biological sciences
subject: 111714 Mental Health
subject: FOS: Health sciences
subject: FOS: Health sciences
subject: Plant Biology

description: The shape and structural development of the box-like Parrabel Dome (PD) within the Hastings Block is poorly understood because it has only been weakly cleaved, complexly folded and extensively faulted in comparison to the adjoining blocks. Better characterising this block will provide important controls on the tectonics of the southern New England Orogen. The structural development of the PD and southern Hastings Block (SHB) provides evidence of the degree of rotation, translation and deformation of the Hastings Block, a key terrane within the southern New England Orogen. A major decollement under the Hastings Block–Nambucca Block was suggested to facilitate south-directed deformation caused by the developing Coffs Harbour Orocline. The orientation of bedding and the stratigraphic facing of some fault blocks within the northern Hastings Block (NHB) are consistent with development of the PD, while other fault blocks indicate significant disruption of the NHB prior to, during and after dome development. A deep-seated fault is suggested by the gravity worm analysis consistent with the boundary zone between the PD, NHB-Yarrowitch Block and the east-dipping and younging sequences in the SHB. The eastern limb of the PD underwent clockwise rotation after formation. Fault blocks have been rotated and translated within a restraining bend as the NHB moved post-PD formation northwest along the interface between the NHB and SHB.KEY POINTSThe Hastings Block was translated and rotated into its current position from the southeastern end of the Tamworth Belt.Gravity worm data indicate a boundary between northern and southern Hastings Block.The Hastings and Nambucca blocks have been detached from the basement Gondwana rocks.Fault block analysis within the Parrabel Dome, northern Hastings Block indicates relocation of some blocks by faulting. The Hastings Block was translated and rotated into its current position from the southeastern end of the Tamworth Belt. Gravity worm data indicate a boundary between northern and southern Hastings Block. The Hastings and Nambucca blocks have been detached from the basement Gondwana rocks. Fault block analysis within the Parrabel Dome, northern Hastings Block indicates relocation of some blocks by faulting.