Fig 1. Basement rocks of Eastern Australia.2
The deepest rocks in the vicinity of Phillip Island, indeed in Victoria, are related to the exposed fold belts of eastern Australia.1 These were deposited rapidly early during the global Flood (Genesis 6–8) under the ocean. There was a large volume and variety of materials deposited including fine silt, poorly sorted sand, and different types of volcanic lava. The basement areas are large and have been given different names depending on where they are exposed (figure 1). The deposits comprise many thousands of metres of sediments and volcanics including Cambrian greenstone, Ordovician greywacke, and coarser Silurian strata.
Tectonic movements in the earth’s crust compressed these deposits in an east-west direction, and uplifted them, producing huge faults and folds in the strata. The strata were pushed onto each other and shortened by the compression. Mineral laden fluids within the sediments squeezed out through faults and cracks and released their dissolved booty, including gold, in mineralization areas which are now mined.
These catastrophic tectonic movements generated huge volumes of molten rock, called magma, which was forced toward the surface where it collected in magma chambers within the sediment piles (called plutons, such as the granite pluton forming Cape Woolamai). Some magma broke through the surface and blasted over the landscape as volcanic eruptions. These rocks have been classified as Devonian….
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