Abstract
Since Early Proterozoic times, Wilson cycles have operated, each beginning with the breakup of continents, evolving into the stage with a mature ocean framed by passive continental margins, and concluding with subduction and collision (Ch. 11). Remnants of oceans, present as ophiolite complexes in orogens, are the best indication of plate tectonic processes and mountain building. However, ophiolites older than 800 Ma are uncommon. Older ophiolite complexes do exist that resemble those in young Alpine orogens. They were derived from oceans formed 2500 to 2000 Ma ago by the break-up of Archean cratons and 1600 to 600 Ma by the break-up of the supercontinents Panotia and Rodinia. Examples are the Zunhua-Wutaishan ophiolite in northeast China, the Purtuniq ophiolite in northeast Canada, and the Jormua ophiolite in Finland (Fig. 12.1). These ophiolites suggest that oceanic crust at that time was at least as thick as in modern oceans (ca. 6 km).
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Frisch, W., Meschede, M., Blakey, R. (2011). Old orogens. In: Plate Tectonics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-76504-2_12
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DOI: https://doi.org/10.1007/978-3-540-76504-2_12
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