EAS201 Lecture Notes - Lecture 24: Salt Dome, Sodium Chloride, Silt
20 Sep 2016
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Most form in coastal marine environments that are hot (as in evaporitic) Evaporation produces a dense brine that sinks and forms a thick evaporite deposit. Shallow sill impedes the outflow of dense brine from the basin salinity levels that it takes: Caco3 + camg(co3)2 (calcite + dolomite) seawater ~ 35 g/l. In rare cases of extreme evaporation: potash salts (k-chlorides, k- sulfates, k-hydroxides) How much salt per volume seawater? (chart) [pdf posted] Typical marine evaporite deposits: massive, interbedded with clay and silt. Salt begins to flow very slowly and doesn"t take much heat to make it do that (~15-16 degrees) Same salts as in marine settings plus some non-marine evaporite minerals, such as trona (na2co3-nahco3-2h2o) You will not get trona from seawater, lakes have a bunch of different minerals in them. Devonian salts, thickest part is in saskatchewan and straddling into alberta. Largest potash salt deposit in the world: devonian prairie evaporate .
