Earth Sciences 1022A/B Lecture Notes - Lecture 20: Gypsum, Calcite, Kimberlite
19 Oct 2016
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Final exam (40%), 2hr. is on thursday, april 16. 1/3 from before midterm, 2/3 from after midterm. Only answer 40/50 questions, scratch out 10 questions. Magmatic: early crystal settling of chromite, magnetite, platinum; late crystallization of lightest minerals in pegmatites. Hydrothermal: hot uids with metals precipitate ore in vein deposits (gold, silver); disseminated deposits spread through host rock; volcanic massive sulphide deposits in ancient sea oor at oceanic ridges. Sedimentary: banded iron formation in precambrian sea; placer deposits of gold, diamonds by running water. Weathering: bauxite forms in tropics, provides aluminum ore. Aggregate and stone: crushed stone, sand, gravel mined for concrete and asphalt; cut stone for decoration. Industrial minerals: diamonds for abrasives, gemstones; form deep in mountain belts but mined for kimberlite pipes; clay for bricks, drainage pipes, pottery; weathered silicates; Thursday, march 26, 2015 calcite for cement, asphalt evaporate salts: gypsum for plaster, salt for food etc. , potash for fertilizer phosphate and sulphur for agriculture.
