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back-arc basin |
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back-arc basin [′bak‚ärk ‚bās·ən] (geology) The region (small ocean basin) between an island arc and the continental mainland formed during oceanic plate subduction, containing sediment eroded from both. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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However, the epithermal deposits east of PNG, in Fiji and in the Coromandel goldfield are also associated with felsic to mafic alkalic rocks and normal faulting indicating an extensional tectonic regime, probably in a backarc or intra-arc setting. |
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