EESA06H3 Lecture 9: Lecture 9
Document Summary
z: greenstone belts on the canadian shield: vms deposits (volcanogenic massive sulphides): copper, silver, sudbury meteorite crater: nickel, oil, gas, coal, tar sands & evaporates in sedimentary basins, diamonds and hot spots, placer gold in glacial sediments. Reserves: economic, discovered: reserves are economically shrinking, a lot is non-recoverable because it cannot be reached. Difference between resources/reserves is the cost of the commodity. Mining: chert mining 11,000 years ago in ontario (oldest, william logan produced the first geology map of canada. Pillow basalt - formed under the ocean but end up in the middle of canadian shield: land masses grow (accretion) from protocontinents like japan into larger continents. Greenstone belts record waves when they were rising from the ocean: most mineral rich rocks in canada. Mid ocean ridges: modern analogs for greenstone belt: water leeches out the metals that are in the basalt, radiate deposits close to the ocean floor, minerals accumulate.
