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Plate Tectonics: Origins and Implications
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[QUOTE="Astronuc, post: 6830378, member: 15685"] [HEADING=2]A Tour of Earth's Ancient Supercontinents[/HEADING] [MEDIA=youtube]ZpoplYQhoFs[/MEDIA]9:15 - 12:15 NASA Magellan Mission and Mapping of Surface of Venus (some discussion of plate tectonics or the lack thereof) Some interesting comments and ideas. The narration mentions zircons (including U/Pb ratios), fossilized plants, fossilized sea and terrestrial creatures, types of rocks (basalt vs granitic; metamorphic vs sedimentary) and their compositions, . . . Nomenclature/key words: Orogenic belts/formations, cratons, magnetic reversals, Abraham Orterlius (1527-1598), continental drift, paleogeography, glossopteris, A possible time line of plate tectonics: Archeon Eon (4 to 2.5 billon years ago), Ur (hypothetical first super continent, 3.1 billion years ago, based on cratons dating to about 3 billion years; more conservative model has kratons formed in a succession of supercontinents that formed and reformed during a period from the mid Archean and early Proterozoic eons; Vaalbara (3.4 to 2.7 billion years ago), some link between Kappvaal and Pilbara cratons), Superior (2.7 - 2.3 billion years ago, based on the Canadian Superior craton), Scalvian (2.6 to 2 billion years ago, based on Canadian Sclavian craton), Proterozoic Eon (2.5 billion to 541 million years ago), Columbia supercontinent (1.8 to 1.5 billion years ago), boring billion period (1.8 billion to 800 million years ago), Rodinia (1.1 billion to 600 million years ago), Pannotia (650 to 500 million years ago), Gondwana (500 million to 180 million years ago), Silurian Period (443-419 million years ago), Pangea (335 to 175 million years ago, the last supercontinent)[HEADING=2]Volcanic evolution of the Pacific Northwest: 55 million year history[/HEADING] [MEDIA=youtube]3o3IJlAHhTE[/MEDIA]At 3:54 in the Volcanic evolution video, there is mention of a pivot point in NE Oregon about which a piece of the N. American plate rotates clockwise. Pivoting of the continents (or plates) is mentioned in the first video, and I find the pivoting interesting. We currently is live in a time of continental dispersion, but it is predicted (46:35 in the first video) that Africa and Arabia will continue to move northward into Europe, closing the Mediterranean Sea and forming new mountains, Australia and Antarctica will combine (with NZ perhaps) and move to the N, and N. America and S. America will pivot into one another and move to the Afro-Eurasian amalgamation - in the future (200 million years or so). [/QUOTE]
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