The Elements of economic geology

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Monograph

Identifikator:: 1773832379

URN:: urn:nbn:de:zbw-retromon-172798

Document type:: Monograph

Author:: Gregory, John W. http://d-nb.info/gnd/11683014X

Title:: The Elements of economic geology

Place of publication:: London

Publisher:: Methuen

Year of publication:: 1928

Scope:: XIV, 312 S.; graph. Darst.

Digitisation:: 2021

Collection:: Economics Books

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Document type:: Monograph

Structure type:: Chapter

Title:: Part III. Earthy minerals

Collection:: Economics Books

THE SALT DEPOSITS 207 be evaporated. As sea-water contains on an average 35 parts of salt per 1000, the evaporation of 1000 feet of sea- water would deposit a layer which, if compact, would be about 15 feet thick. If the basin were again covered by the sea the magnesium and potassium chlorides of the upper layer would be dissolved ; another 15 feet of salt per 1000 feet of evaporated water might be laid down, and this process of submergence and evaporation might go on indefinitely. The evaporation of 30,000 feet of sea-water, the approximate maximum depth of the oceans, would deposit only 450 feet of salts. Yet some salt deposits are thousands of feet in thickness. CoNCENTRATION IN Sart Lakes—The deposits in an inland sea (i.e. a sea completely cut off from the oceans) that receives river-water containing bicarbonate of lime, would contain precipitates of carbonate and sulphate of lime; by this precipitation the sea-water would gradually lose its carbonates and sulphates. Further evaporation would precipitate the sodium chloride and the water would be left as a bittern containing magnesium and potassium chlorides, which might be deposited as carnallite (MgCl, KCl, H,0). Such conditions may be illustrated by the Dead Sea. The quality of the water poured into it from the Jordan is shown by the analysis A; the composition of the Dead Sea water is shown (B) from a sample from the depth of about 600 feet, & miles from the northern end :— Cl. Br . S50, CO, Na K . Ca . Mg . SiO, . Salinity Qa 414 7422 13°11 18-11 1-14 10°67 4-88 I-95 ‘08 per cent. B 67-84 I-75 oY fr. 100 1-79 1-68 157 ti. 24 per cent. All the carbonate and most of the sulphate of lime intro- duced from the Jordan is precipitated, and the Dead Sea water

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