at a subduction zone where oceanic lithosphere meets continental lithosphere, which would subduct and why?

Oceanic Lithosphere

Explanatation

Oceanic lithosphere is more dense (compacted by immense pressure from oceans) and the continental lithosphere is less dense (lack of pressure from anything above it).  When the two collide, the continental lithosphere will essentially float on top of subterranean magma while the oceanic lithosphere, being the denser of the two, will slip beneath the continental lithosphere and dive into the magma chamber.  

the precambrian aged rocks could be found in australia. australia is a region that has a lot of ancient civilization history from million years ago. in this region, there are a lot of recognizable fossils buried in its land which is considered a precambrian-aged rocks