Dating deformation using crushed alkali feldspar: 40 Ar/ 39 Ar geochronology of shear zones in the Wyangala Batholith, NSW, Australia

Date

2014

Authors

Forster, Margaret
Lister, Gordon
Lennox, P G

Journal Title

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Volume Title

Publisher

Blackwell Publishing Ltd

Abstract

Diffusion parameters have been estimated for K-feldspar in and adjacent to mylonite shear zones in the Wyangala Batholith. The parameters obtained suggest that deformation during mylonitisation would have caused argon systematics to reset because diffusion distances were reduced by cataclasis, deformation and/or recrystallisation. However, the mineral lattice remained sufficiently retentive to allow subsequently produced radiogenic argon to be retained. 40Ar/39Ar geochronology is thus able to constrain operation of these biotite-grade ductile shear zones to the period from ca 380 Ma to ca 360 Ma, at the end of the Tabberabberan Orogeny.

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Citation

Source

Australian Journal of Earth Sciences

Type

Journal article

Book Title

Entity type

Access Statement

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DOI

10.1080/08120099.2014.916751

Restricted until

2037-12-31