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Plate Tectonics and Newfoundland The Geology of Newfoundland and Labrador STSE Answer Question #1 The rocks in this zone formed from either lava (volcanic) or magma (plutonic). These rocks are igneous and additionally, are late Precambrian in age. There are some sedimentary rocks of the same age in amongst the igneous rocks. Above all of these rocks are sequences of sedimentary rocks that are Palaeozoic in age. These rocks formed from terrestrial deposition as well as shallow marine deposition. The shallow marine deposition occurred on a continental margin. Plate Tectonics and Newfoundland The Geology of Newfoundland and Labrador STSE Answer Question #2 The rocks on the Western Platform are similar to those on the Avalon Platform in terms of age. Both are Precambrian at the base with early Paleozoic rocks on top. As well, the Western Platform contains sedimentary rocks that were deposited in a shallow marine environment. The sedimentary rocks on both platforms contain fossils of marine species. The trilobite fossils differ on the two platforms in that both represent different species. Plate Tectonics and Newfoundland The Geology of Newfoundland and Labrador STSE Answer Question #3 The rocks in the Central Mobile Belt differ from the other two zones in that they are all Paleozoic in age (CambrianOrdovician). They are sedimentary rocks and they formed in a deep marine environment. There are also volcanic rocks throughout this zone that form from island arc volcanoes (oceanic-oceanic collision). The Central Mobile Belt is indicative of a deep ocean, whereas the Avalon Platform is a piece of the African continent and the Western Platform is a piece of the North American continent. Plate Tectonics and Newfoundland The Geology of Newfoundland and Labrador STSE Answer Question #4 i) Rodinia rifted and broke apart 750 Ma. ii) The Iapetus Ocean was opening from 510 Ma to 475 Ma. (35 Ma in total) iii) The Appalachian Mountain Chain was formed once the Iapetus Ocean completely closed. iv) With the closure of the Iapetus Ocean came the creation of the next supercontinent called Pangaea. Plate Tectonics and Newfoundland The Geology of Newfoundland and Labrador STSE Extension Activity Plate Tectonics and Newfoundland The Geology of Newfoundland and Labrador Site of ophiolite sequence Western Platform Central Mobile Belt Avalon Platform Plate Tectonics and Newfoundland The Geological Layout of Newfoundland Humber (Western) Zone Has been a part of the North American plate for at least the last billion years. Central (Zone) Mobile Belt Remnants of volcanic arcs and the ancient Iapetus ocean floor. Avalon (Eastern) Zone Once part of the African plate which remained attached as Pangaea split 200 million years ago. Humber Zone Central Mobile Belt Avalon Zone