| Indo-australian Plate |
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Information AboutIndo-australian Plate |
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| tectonic plates | |
| geology of australia | |
| geography of indonesia | |
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The Indo-Australian Plate is an overarching name for two . The two plates fused together between 50 to 55 million years age, prior to that time, they moved independently. India , Meganesia ( Australia , New Guinea , and Tasmania ), New Zealand , and New Caledonia are all fragments of the ancient supercontinent of Gondwana . Seafloor Spreading separated these land masses from one another, but as the spreading centers became inactive they were thought to have fused into a single plate. Recent research indicates that the plates are separating, however it will take some time to properly publicise this fact. [http://www.columbia.edu/cu/pr/95/18688.html Recent GPS measurement in Australia confirms the plate's movement as being 35 degrees east of north with a velocity of 67mm/yr. Note also the same directions and velocities for points at Auckland , Christmas Island and southern India . The slight change in direction at Auckland is presumably due to a slight buckling of the plate there, where it is being compressed by the Pacific Plate . The easterly side is a Convergent Boundary with the subducting Pacific Plate . The Pacific Plate subducting under the Australian Plate forms the Kermadec Trench , and the Tonga and Kermadec Island Arc s. New Zealand lies along the southeastern boundary of the plate. New Zealand and New Caledonia are the southern and northern ends of the former land mass of Tasmantis , which separated from Australia 85 million years ago. The central part of Tasmantis sank below the sea, and now constitutes the Lord Howe Rise . The southerly side is a Divergent Boundary with the Antarctic Plate . The westerly side is subdivided with the Indian Plate that forms a boundary with the Arabian Plate to the north and the African Plate to the south. The northerly side of the Indian Plate is a Convergent Boundary with the Eurasian Plate forming the Himalaya and Hindu Kush Mountain s. The north-east side of the Australian Plate forms a Subducting Boundary with the Eurasian Plate on the borders of the Indian Ocean from Bangladesh , to Myanmar (former Burma ) to the south-west of Indonesia n islands of Sumatra and Borneo . The subducting boundary through Indonesia is reflected in the Biogeographical Wallace Line that separates the indigenous fauna of Asia from that of Australasia. |
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