Right mechanism, but wrong timing. Pegmatites in the yilgarn will be Archean in age, so older than the Proterozoic dykes.
The pegmatites will have intruded through pre-existing weaknesses such as bedding layers, shear zones etc or bust right through/across lithologies depending on pressure. Proterozoic dykes would have followed similar weaknesses but later.
Ann: Expanded Lithium Soil Anomaly at Lake Johnston, page-156
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