WORLDKINGS - Worldkings News - Australia Records Institute (AURI) – Macquarie Island: World's only island composed entirely of oceanic crust and rocks from the mantle


( Macquarie Island is the world's only island composed entirely of oceanic crust and rocks from the mantle.

Macquarie Island lies almost 1,500 kilometres to the southeast of Tasmania, about half-way between Australia and Antarctica. The property includes Macquarie Island, Judge and Clerk Islets 11 kilometres to the north, the Bishop and Clerk Islets 37 kilometres to the south, rocks, reefs and the surrounding waters to a distance of 12 nautical miles. 

The main island is approximately 34 kilometres long and 5.5 kilometres wide at its broadest point, covering an area of approximately 12,785 hectares. The property covers an area of 557,280 hectares. 

Macquarie Island has outstanding universal value for two reasons. First, it provides a unique opportunity to study, in detail, geological features and processes of oceanic crust formation and plate boundary dynamics, as it is only place on earth where rocks from the earth’s mantle (6 kilometres below the ocean floor) are being actively exposed above sea level.

These unique exposures include excellent examples of pillow basalts and other extrusive rocks. Second, its remote and windswept landscape of steep escarpments, lakes, and dramatic changes in vegetation provides an outstanding spectacle of wild, natural beauty complemented by vast congregations of wildlife including penguins and seals.


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