کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4718201 | 1639084 | 2015 | 16 صفحه PDF | دانلود رایگان |
• New volcanic samples were collected from the offshore southwestern Australian margin.
• Volcanic rocks come from a variety of tectonic settings.
• Cretaceous volcanic rocks erupted in a continental extensional setting.
• Younger volcanic rocks reflect a transition to a mature passive continental margin.
• Volcanic cones with ocean island basalt chemistry formed in the final stage.
Igneous rock samples recovered during the 2008–09 Australian Southwest Margin Marine Reconnaissance Survey (GA-2476), off the Western Australian coast from Perth to the Wallaby Plateau, come from a variety of tectonic settings reflecting a complex magmatic history of this margin. Cretaceous rhyolite and basaltic andesite samples most likely erupted in a continental extensional setting, while younger volcanic samples reflect a transition to a mature passive continental margin with the generation of mid-ocean ridge basalt. During the last phase of volcanism, a series of volcanic cones and mounds with ocean island basalt geochemical signatures formed along the margin. The pre-rift sedimentary rocks sampled on the Wallaby Plateau support the viewpoint that it is an extended block of continental crust, overlain by syn-rift and post-rift volcanic rocks.
Journal: Marine Geology - Volume 368, 1 October 2015, Pages 42–57