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Porosity2012b - Porosity of Rocks Cont Major features of...

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1 Porosity of Rocks Cont. Karst : Chemically precipitated rocks: Limestones (CaCO 3 ), Dolostones (CaMg(CO 3 ) 2 halite (NaCl) salt gypsum (CaSO 4 ) are susceptible to chemical weathering that can produce large localized pore volumes such as sink holes, caves, and conduits. Porosity of a karst aquifers typically range from 0 –60%. Major features of Karst topography http://pubs.er.usgs.gov/djvu/WS Examples: Floridan and Biscayne Aquifers In Florida P/wsp_2220.pdf . Stalactites Karst Features Stalagmites Cave Features Sink Hole Formation Drop in groundwater below the top of a cave can cause Sediments near a vertic