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Concept
Australian Plate
Summary
The Australian Plate is a major tectonic plate in the eastern and, largely, southern hemispheres. Originally a part of the ancient continent of Gondwana, Australia remained connected to India and Antarctica until approximately when India broke away and began moving north. Australia and Antarctica had begun rifting by and completely separated a while after this, some believing as recently as ,but most accepting presently that this had occurred by .
The Australian plate later fused with the adjacent Indian Plate beneath the Indian Ocean to form a single Indo-Australian Plate. However, recent studies suggest that the two plates have once again split apart and have been separate plates for at least 3 million years and likely longer. The Australian Plate includes the continent of Australia, including Tasmania, as well as portions of New Guinea, New Zealand and the Indian Ocean basin.
The continental crust of this plate covers the whole of Australia, the Gulf of Carpentaria, southern New Guinea, the Arafura Sea, the Coral Sea. The continental crust also includes northwestern New Zealand, New Caledonia and Fiji. The oceanic crust includes the southeast Indian Ocean, the Tasman Sea, and the Timor Sea. The Australian Plate is bordered (clockwise) by the Eurasian Plate, the Philippine Plate, the Pacific Plate, the Antarctic Plate, the African Plate and the Indian Plate. It is however known from movement studies that this definition of the Australian Plate is 20% less accurate than one that assumes independently moving Capricorn, and Macquarie microplates.
The northeasterly side is a complex but generally convergent boundary with the Pacific Plate. The Pacific Plate is subducting under the Australian Plate, which forms the Tonga and Kermadec Trenches, and the parallel Tonga and Kermadec island arcs. It has also uplifted the eastern parts of New Zealand's North Island.
The continent of Zealandia, which separated from Australia and stretches from New Caledonia in the north to New Zealand's subantarctic islands in the south, is now being torn apart along the transform boundary marked by the Alpine Fault.
Official source
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