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

ORES OF IRON 133 clude lumps of garnet and amphibole, that can be removed by hand sorting. In some places (e.g. Kennedy Lake, Vancouver Island), the igneous rock is granite, and the iron must have been brought up the contact plane and not derived from the igneous rock. (For this type of ore in Canada, cf. Lindeman and Bolton, Iron Ores, Canada, Dept. Mines, 1917.) PRIMARY LODES—CZECHO-SLOVAKIA AND WESTPHALIA Owing to the abundance of iron within the earth, and its ready solubility, it has naturally been often carried upward in solution and deposited in primary lodes. They are as a tule commercially unimportant as other iron ores are more cheaply mined. Some lodes of specular hematite with sulphides of copper, lead, and zinc are associated with igneous rocks, and have been regarded as contact ores ; but when neither of the rocks in contact contains much iron, the lodes must have been supplied along the contact plane. In some Tuscan localities these ores occur between igneous and sedimentary rocks; but in Elba similar ores, in large masses, lenticles and veins, replace limestones some distance from any igneous rock. The hematite is associated with garnet, pyroxene, epidote, and a hydrous iron-calcium silicate, ilvaite. The ores in Elba were formed after the Eocene in connection with 'gneous activity and earth-movements. In Czecho-Slovakia (near 49° N., 21° E.), about 220 miles S. of Warsaw, between the towns of Wallendorf and Ein- stedel, a mountain range of Devonian and Carboniferous slates and sandstones contains many fissure lodes of siderite near intrusive greenstones and granite. The lodes are of Paleozoic age and consist of siderite and quartz with tourma- line and barite. The ores are probably primary and were formed in connection with the granite intrusions. The area 1810 the Carpathian Mountains, and during their uplift in the Middle Kainozoic, the field was intensely disturbed, and "he lodes received additional constituents including mercury. The primary iron lodes hitherto of most value are those of the carbonate, siderite, as in the Siegerland in West- phalia. an aren, of Devonim: slates and sanittonct batide the

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