Abstract
E–W structural and igneous trends in the Charters Towers Province are highly anomalous within the overall N–S trending Tasman orogen of eastern Australia and resulted from a sequence of N–S shortening events. A succession of ~ E–W trending FIAs (Foliation Intersection/Inflexion Axis preserved within porphyroblasts) dated at 474.7±7.2, 413±13 and 381.1±8.1Ma correspond with adjacent granite crystallization ages and E–W trending FIA ages in the Greenvale Province to the NW. The magnetic anomaly map of Australia reveals that this E–W trending portion of the Tasman orogen links with and truncates several earlier formed orogens. The E–W trend of the Charters Towers Province resulted from overprinting of early Palaeozoic N–S trending structures in the Tasman Orogen by younger E–W ones during the Alice Springs Orogeny (450–300Ma) resolving the E–W pluton shape and distribution of Cambrian to Devonian magmatic activity plus the truncational nature of aeromagnetic data from Central Australia to the East coast.
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