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EESA06H3 (563)
Nick Eyles (495)
Lecture 10

Lecture 10

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Environmental Science
Nick Eyles

EESA06 th 27 March 2009 Zircon age dating - Orogeny required to create zircon - Banded - Discovered by Tom Krogh Political unification of the provinces 1867 to 1949 - LLo}2}o]L2}2}o}2] oZ}]L Z[Z}2Z2}o}2] ]K J. Tuzo Wilson - came up with the idea of plate tectonics - L[ZK}ZK}Z2}o}2]Z - Approximately every 500million years, continent aggregate into super continents - Wilson cycle 1. Continent 2. New rifting MOR 3. Seafloor spreading MOR 4. Subduction initiation 5. Ocean closing 6. Collision, orogeny 7. New rifting - Little islands get incorporated into large continents and continents grow - Terrane: a block of crust that will eventually collide with a land mass, e.g. japan o It is different than the rest of the continent Deconstruction of North America - NA is divided into 5 main pieces 1. The original NA continent, arctica, which started to form about 2.5 billion years ago from smaller continents and was completed by about 1.9 million years ago when old Archean cratons (e.g. Slave, Nain provinces ) were welded together b
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