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

CHAPTER XVIII THE SALT DEPOSITS! Composition oF SeA-WaTer—The characteristic feature of sea-water is its saltness. The analyses by Dittmar of the many samples of sea-water collected by H.M.S. “ Challenger (1873-6) show the following composition :— Sodium chloride Magnesium chloride Magnesium sulphate Calcium sulphate Potassium sulphate . Calcium carbonate . Magnesium bromide Per cent. 77758 10-878 4737 3-600 2-465 0345 0-217 {00-000 The variations from this composition are slight except near the mouths of great rivers and in enclosed seas, i.e. a sea with only one outlet, such as the Mediterranean and the Baltic. If an arm of the sea be cut off from the ocean and its water evaporated, the salts are deposited in the order of their insolubility. When 37 per cent. of the water has been removed the calcium sulphate is deposited ; when 93 per cent. has gone common salt (sodium chloride) and sodium sul- phate are precipitated ; the magnesium chloride, potassium chloride, and bromine are left in the brine which, from its taste, is known as bittern. The chlorides in the bittern are 50 soluble that they are not deposited unless all the water !¢ The Geology of Potash,” with some account of the German salt fields has Deen given by the author, 77, G.S. Glasgow, xvi, 1916, pp 12-33, pl. I. 230)

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