EARTHSC 2GG3 Lecture Notes - Lecture 14: Karst, Calcium Carbonate, Gypsum
18 Dec 2018
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Guatemala city, guatemala: sinkhole in the middle of the city. Slow or rapid, near vertical, downward movement of earth"s surface. Not catastrophic - pretty slow: karst. Landscape resulting from the dissolution of limestone, dolostone, marble, gypsum or rock salt. Generally limestone: soil expansion and contraction results from: Dolane - technical term for sinkhole: (might be on exam, karst plain - surface pockmarked w a large # of sinkholes. Young karstic: hamilton younger than this, small little sinkholes, overtime, moving water causes rocks to dissolve, disappearing streams (river and then fall into hole) Sinkholes: can range from one to several hundred meters in diameter, two basic types: Solution sinkholes: pits formed by dissolution of buried bedrock along planes and fractures, kentucky, limestone that dissolves quickly, hamilton also sits on karst, calcium carbonate rocks -> easily dissolved by rain fall. Collapse sinkholes: collapse of surface or near-surface rock or sediment, suffosion sinkhole.
