Radiometric evidence for the age of emplacement and cooling of the Murrumbidgee Batholith
- 1 September 1976
- journal article
- research article
- Published by Taylor & Francis in Journal of the Geological Society of Australia
- Vol. 23 (3) , 223-233
- https://doi.org/10.1080/00167617608728936
Abstract
Most of the rocks of the Murrumbidgee Batholith have a Rb‐Sr age of 424 ± 2 m.y. This is considered to be the time of emplacement. A small difference in the ages (4 ± 2 m.y.) between the northern and southern parts of the batholith is attributed to thermal effects caused by a slightly later time of emplacement of some of the intrusions or to a short cooling interval. Final intrusive activity ended by 414 ± 4 m.y. Younger mineral ages for some intrusions are related to later local meta‐morphic effects.Keywords
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