Does the Manning Orocline exist? New structural evidence from the inner hinge of the Manning Orocline (eastern Australia)

Li, Pengfei and Rosenbaum, Gideon (2014) Does the Manning Orocline exist? New structural evidence from the inner hinge of the Manning Orocline (eastern Australia). Gondwana Research, 25 4: 1599-1613. doi:10.1016/

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Author Li, Pengfei
Rosenbaum, Gideon
Title Does the Manning Orocline exist? New structural evidence from the inner hinge of the Manning Orocline (eastern Australia)
Journal name Gondwana Research   Check publisher's open access policy
ISSN 1342-937X
Publication date 2014-05
Year available 2013
Sub-type Article (original research)
DOI 10.1016/
Open Access Status
Volume 25
Issue 4
Start page 1599
End page 1613
Total pages 15
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2014
Language eng
Formatted abstract
• The Manning Orocline is expressed by the fabric in the accretionary wedge rocks.
• Our result supports the quadruple oroclinal geometry in the New England Orogen.
• The origin of the oroclinal structure is possibly relevant to slab rollback.

The map-view structure of the southern New England Orogen in the eastern Gondwanan margin is characterised by four tight orogenic-scale curvatures: Texas, Coffs-Harbour, Manning and Nambucca oroclines. Here we focus on the geometry of the Manning Orocline and examine whether the inner-arc area of the oroclinal structure is expressed within the accretionary wedge rocks of the Tablelands Complex. Our observations from the Tablelands Complex (Armidale–Walcha area) show that rocks were subjected to penetrative deformation (D1), which resulted in a regional slaty cleavage (S1) and related isoclinal folds. This was followed by subsequent deformation (D2) associated with minor gentle folds. In a larger scale, the steeply dipping S1 structural fabric shows a continuous map-view curvature, thus defining a macroscopic fold structure. We interpret this macroscopic fold as the expression of the Manning Orocline within the accretionary wedge complex. This interpretation is consistent with the contorted spatial distribution of other tectonic elements (serpentinite belt, forearc basin terranes and early Permian granitoids), which independently define the structure of the Manning Orocline. Our new structural data support the existence of the Manning Orocline and the quadruple oroclinal geometry of the whole southern New England Orogen. The origin of these oroclines is attributed to multiple stages of bending, possibly associated with an earlier phase of curvature during slab rollback (in the early Permian), followed by a subsequent (middle-late Permian) episode of contractional deformation that tightened the oroclinal structure.
Keyword Orocline
New England Orogen
Eastern Australia
Tablelands Complex
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online 1 July 2013

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2014 Collection
School of Earth Sciences Papers
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Citation counts: TR Web of Science Citation Count  Cited 17 times in Thomson Reuters Web of Science Article | Citations
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Created: Wed, 18 Dec 2013, 10:26:26 EST by Ashleigh Paroz on behalf of School of Earth Sciences