The Elements of economic geology

Bibliographic data

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 II. Ore deposits

Collection:: Economics Books

(14 ECONOMIC GEOLOGY 22 per cent. of Ni); millerite or capillary pyrites (NiS) is well known from its hair-like crystals. Nickel also occurs as an arsenide, and as a hydrous nickel-magnesium silicate, the garnierite of New Caledonia. SupBury — THE GeNEsis oF ITs Ores — The most im- portant nickel mining field is around Sudbury in Ontario, 35 miles N. of Lake Huron. The field consists of pre- Paleozoic rocks, including a basin of sediments, 36 miles by 16, surrounded by a ring of igneous rocks, outside which are steeply tilted sedimentary rocks with greenstones and still older igneous rocks and gneisses. The formation may be tabulated as follows :— Keewenawan Intrusives— ith Quartz - diorite; 3rd Granite; 2nd Micropegmatite ; ist Gabbro (Norite).1 F16. 35 —NIckeL SuLpHIDE ORE OF SUDBURY, Nickel sulphide ore of Sudbury (after T. C. Phemister), The sulphides, black, are replac- ing the silicates in * norite,” The replacement often follows the cleavage planes in the felspars. Animikie. Sandstone, slate, and tuff with the Trout Lake Conglomerate at the base. Greenstone including pillow-lavas like those of the Keewatin, and steeply tilted sediments, conglomerate, and slates which are in places altered to schist. Granitic gneiss and older schists. The nickel ores occur chiefly with pyrrhotite and chalco- pyrite. Some mines contain sperrylite, the arsenide of platinum (Pt As,). The veinstones are quartz, secondary biotite, a felspar-quartz intergrowth, and fragments of the countrv rocks. The sulphides occur (Fig. 38) as veins I The traditional name is norite ; Prof. Coleman remarked that much of it has no rhombic pyroxene, and according to T. C, Phemister the oulk is gabbro.

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