ENV100Y5 Lecture Notes - Lecture 5: Carbonaceous Chondrite, Acasta Gneiss, Solar System
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Terminology is not a detail but language of the discipline. Age of sun and solar system: ~4. 57 ga (giga: billions, alum: year) It is the most primitive material that we know of in the solar system. Carbonaceous chondrite contains condrules and lots of carbon. Ages of primitive materials gives us an idea how old the solar system actually is. All converge about the age of 4. 57 ga. Age of earth: ~ 4. 54 ga. few hundred million years of difference b/w age of earth and solar system. We know it on basis of our models of how solar system was formed and where fits into that model. The oldest rock is 4. 013 ga. part of the acasta gneiss. There are rocks that contain individual mineral grains that are even older than that. Suggesting that there are older rocks that eroded and came back together to make a younger rock. Plate tectonics: the (cid:272)rust is (cid:272)o(cid:374)sta(cid:374)tly (cid:271)ei(cid:374)g re(cid:272)y(cid:272)led.
