Tasmania has an origin at the south pole as a marine deposit from the erosion of material from Australia, India, Africa, Anarctica and South America. At the end of the Permian Era something happened, perhaps the meteorite that cause the Wilkes Land Crater (Antarctica)and over some thousands of years massive amounts of lava was pushed into the upper layers of the marine deposit forming dolerite (called diabase in North America). At this same time these continents broke away and began to drift off, with Tasmania following Australia, it could easily have been another continent.
Dolerite dominates the landscape in Tasmania, most peaks and plateaus are formed from it, some sculpted as nanutaks by glaciers (Cradle Mtn). (Frenchmans Cap is quartzite a notable exception). At the edges continental granite, often very red, features on the north and east coasts, particularly at Freycinet Peninsular and Flinders Island.
On the Tasman Peninsular (more dolerite) many sea cliffs and columns have been formed, as well as Blowholes and two major isthmuses like Eaglehawk Neck
The west coast still has some of the most wild rivers in the world despite the push for hydro electric schemes (Franklin River).
Also on the west coast, Macquarie Harbour is a very large body of water with a narrow outlet to the sea, such that normal tides as pulled by the moon are overcome by atmospheric tides. The tide goes out under a high pressure system and, and comes in under a low pressure system, for days on end.
http://meika.loofs-samorzewski.com over 7 years ago
i'm not into geology but am working on a mining heritage tourism project for Western Tasmania. The West Coast towns of Queenstown, Zeehan, Rosebery, Tullah & Waratah are all located on a richly mineralized ore body referred to as the Mount Reid volcanics.
Each of these towns have mined, copper lead zinc, gold, tin and silver all taken from very complex ore bodies. For more information see http://www.mrt.tas.gov.au/portal/page?_pageid=35,832332&_dad=portal&_schema=PORTAL over 7 years ago
Simply by driving from Hobart to Kingston along the Southern Outlet highway, you can see interesting geology in the road cuttings (about 10 k). Also Tasman Peninsula is a great location to see sea cliffs and sea stacks and dramatic examples of coastal erosion. Take Rob Pennicot's Bruny Island or Tasman Island cruise (2-3 hours) to see dramatic geology from the sea.
http://brunycruises.rtrk.com.au/?scid=47248&kw=4567999 over 7 years agoAnswered by Desdemona Brown via Travellr.com