The significance of E–W structural trends for the Alice Springs Orogeny in the Charters Towers Province, North Queensland

Quentin De Gromard, Raphael (2013) The significance of E–W structural trends for the Alice Springs Orogeny in the Charters Towers Province, North Queensland. Tectonophysics, 587. pp. 168-187.

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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 ± 8.1 Ma 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 (450–300 Ma) 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.

Item ID: 24832
Item Type: Article (Research - C1)
ISSN: 0040-1951
Keywords: Alice Springs orogeny, Charters Towers Province, monazite dating, FIAs, aeromagnetic truncations
Date Deposited: 04 Feb 2013 05:11
FoR Codes: 04 EARTH SCIENCES > 0403 Geology > 040312 Structural Geology @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970104 Expanding Knowledge in the Earth Sciences @ 100%
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