Library Open Repository

Structural history of the Arthur Lineament, northwest Tasmania: an analysis of critical outcrops

Downloads

Downloads per month over past year

Holm, OH and Berry, RF (2002) Structural history of the Arthur Lineament, northwest Tasmania: an analysis of critical outcrops. Australian Journal of Earth Sciences, 49. pp. 167-185.

[img]
Preview
PDF
Holm_Berry.pdf | Download (3MB)
Available under University of Tasmania Standard License.

[img]
Preview
PDF (Author Version)
Holm_and_Berry.pdf | Download (1MB)
Available under University of Tasmania Standard License.

Abstract

The Arthur Lineament of northwestern Tasmania is a Cambrian (510 10 Ma) high-strain metamorphic belt. In the south it is composed of metasedimentary and mafic meta-igneous lithologies of the 'eastern' Ahrberg Group, Bowry Formation and a high-strain part of the Oonah Formation. Regionally, the lineament separates the Rocky Cape Group correlates and 'western' Ahrberg Group to its west from the relatively low-strain parts of the Oonah Formation, and the correlated Burnie Formation, to its east. Early folding and thrusting caused emplacement of the allochthonous Bowry Formation, which is interpreted to occur as a fault-bound slice, towards the eastern margin of the parautochthonous 'eastern' Ahrberg Group metasediments. The early stages of formation of the Arthur Lineament involved two folding events. The first deformation (CaD1) produced a schistose axial-planar fabric and isoclinal folds synchronous with thrusting. The second deformation (CaD2) produced a coarser schistosity and tight to isoclinal folds. South-plunging, north-south stretching lineations, top to the south shear sense indicators, and south-verging, downward-facing folds in the Arthur Lineament suggest south-directed transport. CaF1 and CaF2 were rotated to a north-south trend in zones of high strain during the CaD2 event. CaD3, later in the Cambrian, folded the earlier foliations in the Arthur Lineament and produced west-dipping steep thrusts, creating the linear expression of the structure.

Item Type: Article
Keywords: Arthur Lineament, Cambrian, strain, structure, Tasmania, Tyennan Orogeny.
Journal or Publication Title: Australian Journal of Earth Sciences
Page Range: pp. 167-185
Identification Number - DOI: 10.1046/j.1440-0952.2002.00918.x
Additional Information: The definitive version is available at www.blackwell-synergy.com
Date Deposited: 05 Feb 2007
Last Modified: 18 Nov 2014 03:13
URI: http://eprints.utas.edu.au/id/eprint/698
Item Statistics: View statistics for this item

Repository Staff Only (login required)

Item Control Page Item Control Page