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

Citation

Holm, OH and Berry, RF, Structural history of the Arthur Lineament, northwest Tasmania: an analysis of critical outcrops, Australian Journal of Earth Sciences, 49, (2) pp. 167-185. ISSN 0812-0099 (2002) [Refereed Article]

DOI: doi:10.1046/j.1440-0952.2002.00918.x

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 parauthocthonous '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 Details

Item Type:Refereed Article
Research Division:Earth Sciences
Research Group:Geology
Research Field:Structural Geology
Objective Division:Mineral Resources (excl. Energy Resources)
Objective Group:Other Mineral Resources (excl. Energy Resources)
Objective Field:Mineral Resources (excl. Energy Resources) not elsewhere classified
Author:Holm, OH (Mr Oliver Holm)
Author:Berry, RF (Associate Professor Ron Berry)
ID Code:24733
Year Published:2002
Web of Science® Times Cited:20
Deposited By:Centre for Ore Deposit Research - CODES CoE
Deposited On:2002-08-01
Last Modified:2011-09-23
Downloads:0

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