A review of the palaeogeographic and tectonic development of the Palaeozoic Lachlan Fold Belt of southeastern Australia.

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Abstract

The development of facies patterns throughout the active sedimentary life of the Palaeozoic Lachlan Fold Belt (LFB) has been depicted in 14 facies maps depicting discrete time slices in the interval Early Cambrian to Early Carboniferous. These maps show the progressive palaeogeographic changes from: open marine with marine mafic volcanism in the Cambrian to end-Ordovician, changing to a mixed marine-continental palaeogeography dominated by regionally extensive silicic magmatism and extensional marine basins in the the Silurian-Early Devonian, and finally to a nearly wholly continental palaeogeography marked apparently again by some extensional basins and bimodal magmatism in the Late Devonian-Early Carboniferous. The tectonic origins and context of the principal palaeogeographic configurations have been evaluated by critically assessing the origins of the modern analogues and seeking equivalent, critical tectonic elements in the LFB and by critically evaluating the requirments of previously proposed tectonic models. The currently accepted sequence of orogenies appear to have been parts of a long term nearly continuous orogenic phase of activity, rather than discrete events separated by periods of tectonic quiescence.-from Author

Original languageEnglish
PublisherGeological Society of Australia
Number of pages104
ISBN (Print)978-0909869335
Publication statusPublished - 1 Jan 1983

Publication series

NameGeological Society of Australia, Special Publication
PublisherGeological Society of Australia
Volume10
ISSN (Print)0072-1085

Cite this

Cas, R. (1983). A review of the palaeogeographic and tectonic development of the Palaeozoic Lachlan Fold Belt of southeastern Australia. (Geological Society of Australia, Special Publication; Vol. 10). Geological Society of Australia.