EESA10H3 Lecture Notes - Lecture 10: Uniformitarianism, Gneiss, The Maritimes
22 Oct 2017
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Eesa06h3- lecture (cid:1005)(cid:1004) canada s geologic journey: the last 4 billion years. Very significant pattern on the diagram with the arrangement of colours. Oldest rocks are depicted as black on diagram, and youngest are pink; together these make up shields. If you look at southern africa, the black is surrounded by green and then pink; there is a concentric relationship with the oldest rocks in the middle. Shows continents grow through time (very small land masses grow through time) Continents are not fixed and were quite small landmasses. Contains detrital zircons; they cool and make volcanic rocks and then they break up. 1-arctica (2. 7 ga): smaller scale collision growth the first, second, and third make up the supercontinent _____ Areas (cid:1005) + (cid:1006) + (cid:1007) = ca(cid:374)adia(cid:374) shield (cid:894)(cid:858)the (cid:272)rato(cid:374)(cid:859)(cid:895) (cid:272)o(cid:373)pleted (cid:271)y 75(cid:1004) ma: pangea assembly (350 ma): maritime canada is added during. Appalachians orogeny (appalachian mountains: pangea breakup (<200 ma): british columbia is added during cordilleran orogeny (e. g. rockies)
