Salt Gases Essay - 776 Words

for the inclusion of gases in salt deposits are outlined shortly in the following. Fig. 2-16 shows schematically the geological conditions in marginal areas of the Zechstein basin which provided the prerequisites for the inclusion of gases: tectonic events created passage ways (fissures) through the salt sequence, allowing gases and brines to escape from their host formations below the consolidated — and therefore impermeable — salt sequences. When contacting potash beds, the brines caused alterations of the potash beds, dissolving the most soluble potash minerals and precipitating less soluble salts; as the result, carnallite was replaced by sylvite and halite. In cases where such processes extended laterally into potash beds, sylvite was†¦show more content†¦Although gas inclusions in salt rocks are extremely important in some salt and potash mining districts for their effects on mining operations, they received little attention in textbooks which are now available in English translations, e.g., Borchert and Muir (1964) and Braitsch (1971). This may be due to the fact that, at the time when the German originals were written, these matters were still under controversial discussion; see Gimm and Pforr (1964) with contributions by Obert, Ignatieff, Panek, Baar. More recent publications (e.g., Gimm, 1968) indicate that the views expressed by Baar (1954d, 1958,1962) have been generally accepted. As the formation of gas inclusions in salt rocks requires special conditions, as outlined, such inclusions are rare in salt sequences without potash salts, as no reaction salts could form. This is the reason why the salt domes of the Gulf Coast are free from gas inclusions, with the exception of some cases where gases were occluded in recrystallizing halite, or secondary halite which may have crystallized from migrating solutions due to cooling. In contrast, the salt domes of northern Europe are loaded with pockets of salt rocks with abundant gas inclusions; as a matter of fact, several potash mines were abandoned at the beginning of this century because of the problems caused by gas outbursts (Gimm, 1968, p. 553). To date, no gas inclusions have been encountered in the Prairie Evaporites, in spite ofShow MoreRelatedThe Respiratory System And The Digestive System1640 Words   |  7 Pagesbody has a smaller surface area to volume ratio in comparison to smaller organisms, which are able to gain all gases that are needed though simple diffusion, and therefore is not able to complete all of the exchanges of the materials it requires in the same way. 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