The Elements of economic geology

Bibliographic data

Monograph

Identifikator:: 1777655390

URN:: urn:nbn:de:zbw-retromon-178507

Document type:: Monograph

Author:: Kobatsch, Rudolf http://d-nb.info/gnd/1013687159

Title:: Wirtschaftlichkeitslehre

Place of publication:: Wien

Publisher:: Österr. Staatsdr.

Year of publication:: 1928

Scope:: IV, 200 S.

Digitisation:: 2022

Collection:: Economics Books

Usage license:: Get license information via the feedback formular.

Chapter

Document type:: Monograph

Structure type:: Chapter

Title:: 5. Rationalisierung der Landwirtschaft

Collection:: Economics Books

THE MINERAL FERTILIZERS 201 combined with a molecule of either calcium fluoride in fluor- apatite, or of calcium chloride in chlor-apatite, or of lime in voelckerite, a species named by A. F. Rogers in 1912 after the agricultural chemist who established its existence. Apa- tite is usually present in igneous rocks to the amount of about 6 parts in the thousand, or about -I per cent. of phosphorus. ApaTiTE VEINsS—Apatite may be dissolved from deep- lying rocks, and when the solution cools near the surface the phosphate of lime is deposited in pockets or veins. Some apatite veins have been regarded as igneous dykes such as those near Ottawa in Canada and the Nelsonite “dykes” in Virginia. The apatite veins in gneiss near Ottawa are of gS / I 2 ree iii 2, PC . A Wg A St F16. 53.—PHOSPHATE FORMATION. Diagrammatic section illustrating phosphate formation. The phosphate is black. Gr., granitic rock with phosphatic masses associated with pegmatites; V, apatite veins in granite and in slate, S$; B, beds with bones and coprolites, from which the underlying limestone is con- verted to phosphate; PC, granular phosphate, giving rise to phos- phatic chalks and granular phosphates by concentration by ocean currents, represented by the arrows; C, concretionary phosphate formed on sea floor; A, coral island with limestone phosphatized from guano; AP, volcanic island with banks of guano which form aluminium phosphate; VP, volcanic pipe; SL, sea-level. pneumatolytic origin and due to deep-seated solutions of phosphoric acid. That the Nelsonite (an apatite-ilmenite rock) in syenite and gneiss in Virginia is not intrusive is held by G. R. Mansfeld (Phosph. Res. U.S., 2nd Pan-Amer. Sci. Congr., vii, 1917, p. 731). Guano—The organic formation of phosphate depends on the destruction of apatite by weathering and the removal of its phosphoric acid by rivers to the sea. Some marine animals, such as crabs and the Brachiopod, Lingula, secrete shells of phosphate of lime. Phosphoric acid is also ex- tracted from sea-water by minute plants and animals; they are the food of larger creatures, which are eaten by still

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