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Low-grade metamorphism in the Palaeozoic sequences of the Townsville hinterland, northeastern Australia

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The transition from diagenesis to low‐grade metamorphism for the Ordovician ‐ Early Carboniferous sequences of the Burdekin and Clarke River Basins and the Broken River ‐ Camel Creek region is characterised by b ‐cell dimension and Kübler Index (KI = illite crystallinity) of K‐white micas, clay‐mineral assemblages and conodont colour alteration index (CAI). Data indicate that: (i) there is a regional metamorphic pattern characterised by anchizonal conditions, with consistently higher grade in the Camel Creek region (or Subprovince); (ii) anomalies are explicable in terms of location relative to areas of differing intensity of deformation (e.g. the Ruxton Formation) and inferred greater depth of burial (e.g. southern versus northern outcrop tracts of Quinton Formation); (iii) the regional pattern in the Broken River ‐ Gray Creek area shows general alignment with the regional grain; (iv) there is a generalised north to south increase in CAI for the Broken River region (‘Top Hut' to Broken River, 6), with higher values towards the Montgomery Range intrusions; (v) in the Burdekin Basin, there are higher CAI values north of Mt Podge and ‘Star', and lower values (
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Keywords: Broken River Province; Burdekin Basin; Clarke River Basin; Kübler Index; K‐white mica; Palaeozoic; Queensland; b ‐cell dimension; clay minerals; conodont colour alteration index; thermal history

Document Type: Research Article

Affiliations: 1: Departamento de Geología, Universidad de Oviedo, 33005, Oviedo, Spain 2: Macquarie University Centre for Ecostratigraphy and Palaeobiology, Department of Earth and Planetary Sciences, Macquarie University, NSW 2109, Australia

Publication date: October 1, 2003

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