The age of shear zones on western King Island
Several shear zones occur within Neoproterozoic granites on the north and west coasts of King Island. We have
applied the chemical U-Th-Pb dating method to monazite and xenotime from five of these shear zones to show
that they were formed at 740 ± 9 Ma, immediately after granite intrusion. The strongest reactivation on the shear
zones occurred at 500 Ma and was probably associated with sinistral movement. This event may have occurred at
the same time as the regional cleavage was developed in the Grassy Group. Further reactivation occurred during
the Devonian. There is evidence for brittle reactivation of the Disappointment Bay West Shear Zone in the early
Permian that may correlate with movement on the Grassy River Fault and possibly sinistral transpression on the
eastern margin of Gondwana.
Funding
ARC Research Hub for Transforming the Mining Value Chain : Australian Research Council | IH130200004
History
Publication title
MRT Geological Survey Technical ReportConfidential
- No
Pagination
1-27:27Department/School
Central Science Laboratory, Earth SciencesPublisher
MRTPublication status
- Published online
Place of publication
HobartExtent
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