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Geothermal Energy

Adelaide Geosyncline

Structural Setting

South Australia has extensive deposits of thick Neoproterozoic (Adelaidian) sedimentary and volcanic rocks which were deposited on the Palaeo-Pacific margin of the Rodinia Supercontinent. Preserved Neoproterozoic deposits extend from the Fleurieu Peninsula, south of Adelaide, to the Musgrave Ranges in NW South Australia. The thickest sections were deposited in complex rift basins and outcrop in the Flinders and My Lofty ranges. The Officer Basin consists of equivalent but thinner deposits which accumulate in the Centralian Superbasin.

The central Adelaide Geosyncline is exposed in the central part of the Flinders Ranges and occurs in subcrop where it is overlain by the Arrowie Basin ans Mesozoic or Tertiary strata in the Lake Frome and Lake Torrens regions. Sediments were disrupted by contemporaneous, episodic emplacement of salt diapirs, which form the cores of broad domal structures in the region. The central ADelaide Geosyncline was compressively deformed and faulted during the Middle to Late Cambrian Delamerian Orogeny. Sediments were not subjected to high heat flow and are unmetamorphosed in this region. Granitic intrusives are restricted to the Moorowie Syncline.


The succesion consists of sandstone, siltstone, shale and limestone, deposite in a predominately shallow marine setting.