Earth Sciences 1022A/B Lecture Notes - Lecture 20: Gneiss, Kerogen, Uraninite
27 Nov 2015
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Earth sciences 1022a lecture 20 mineral and energy resources. Magmatic: heavy crystals like chromite and magnetite can settle in cooling pluton, lightest minerals with rare elements crystallize in pegmatite dykes (huge crystals) Sedimentary: banded iron formation including magnetite, hematite, chert formed by bacteria in. Precambrian seas when the atmosphere lacked oxygen: placer deposits formed by running water concentrating heavy minerals (gold, diamonds) Metamorphism: contact metamorphism and associated igneous activity cooked rocks including limestone that became skarns rich in zinc, lead, copper, and gold. Weathering: by hydrolysis of silicate minerals in the tropics, concentrated insoluble aluminum as an oxide (bauxite) that is shipped to. Aggregate and stone: crushed stone, sand, gravel used for concrete, asphalt, cut stone used in building facings, walkways, countertops (granite, gneiss, slate) Fossil fuels whose use is hard on environment. Coal: mainly used for fuel, formed from decayed land plants in ancient swamps that were buried, compressed, then cooked to form coal, canada is a major exporter.
