Radiometric evidence for the age of emplacement and cooling of the Murrumbidgee Batholith |
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| Authors: | J C Roddick W Compston |
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| Institution: | 1. Dept of Earth Sciences , The University , Leeds, ENGLAND;2. Research School of Earth Sciences , Australian National University , Canberra, A.C.T., 2600 |
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| 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. |
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