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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Chapter

Document type:: Monograph

Structure type:: Chapter

Title:: Part III. Earthy minerals

Collection:: Economics Books

THE SALT DEPOSITS 1 cr Br . SO, . CO, . Na . K. . Ca . Mg . : Salinity fi. 41-78 05 23-78 "03 24-49 60 2:60 B. 50°26 08 15:57 *13 25-71 vi 7:07 7 per cent, 16-3096 per cent. y They show that the northern Caspian (A) receives much normal river-water, and that the water in Karabugas (B), has lost most of its carbonate, and nearly all its sulphate of lime, and is almost a bittern. During the dry season sul- phates of lime and sodium are deposited on the floor of Kara- bugas, but none of the chlorides; for they escape as an out- flow of heavy brine. If the bar between the Caspian and Karabugas were raised so that the basin were isolated, then further evaporation of the water would precipitate the sodium chloride as rock-salt and the chlorides of potash and magnesium as carnallite. If the wind covered the basin with clay, these deposits might be preserved. The load of salts might cause the subsidence of the area, and enable the sea to reflood the basin. Another sheet of gypsum and salt would be deposited. Many successive subsidences would result in a great thickness of salt deposits. Thick beds of salt would also be produced if an extensive inland sea were reduced by evaporation and its water con- centrated in one depression and the salts all deposited there. If the salt deposits were 15 feet thick for each 1000 feet of sea-water, and they were laid down over only 1 square mile for every 100 square miles of the dwindling sea, the deposits over the mile would be 1500 feet in thickness. Neither the bar theory nor that of concentration in one part of a basin is exactly applicable to the German salt deposits, for sea-water does not contain enough calcium to produce the enormous quantities of sulphate of lime that occur there. The basin while undergoing evaporation, must have continually received river-water containing lime. Accordingly the bar theory was rejected for Central Germany

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