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

214 ECONOMIC GEOLOGY In the Salz-Kammergut in Eastern Austria tongues of salt project into clays like igneous intrusions, and the clays around have been disturbed and moved by the entrance of the salt. The salt was apparently deposited in the area by evaporation, and during subsequent earth-movements some of it was dissolved and redeposited in tongues, which as they grew forced their way into the shales. Porasu SALTs VALUE 1v AcricuLTurE—Potash is indispensable in agriculture as a fertilizer, owing to the amount which is removed from the soil in each crop. A wheat crop of 30 bushels to the acre removes 28 Ib. of potash, a hay crop of 14 tons to the acre 56 Ib., a 6-ton crop of turnips 78 Ib., and a 22-ton crop of mangels 3001b. The potash in soils is mainly derived from the felspars and felspathoids. The potash in these minerals occurs as a silicate; during weathering it is dissolved as bicarbonate and carried by rivers to the sea. In the Thames at Kew 1} per cent. of the dissolved matter in the water is potassium, and there is 1 1b. of potassium in every 00 tons of water. Waters which flow directly from areas of felspathic rock contain larger amounts. Potassium amounts to 6-71 per cent. of the salt in the Eger, a tributary to the Elbe in Saxony, and to 4 per cent. in Lac de Champex in the Valais in Switzerland. DEerivED FROM Sea-WateErR—Potassium occurs in the sea as sulphate and chloride ; some of it is deposited as glauconite, which colours greensand : some potash is extracted by sea- weeds, of which the burnt ash or * kelp.~was formerly the chief source of supply. Potassium chloride, owing to its extreme solubility, re- mains in evaporating sea-water until the water has been al- most completely removed. Potash chloride collects in such lakes as the Dead Sea. When such waters are completely evaporated their potash is deposited as one of a series of sulphates or chlorides. The first potash is precipitated as a sulphate, such as glaserite (K,SO,), which may be associated with the other simple sulphates, kieserite (MgSO, H,0), glauber salt (Na,SO,), and anhydrite (CaSQ,), and also with such double sulphates as glauberite (sulphate of calcium and

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