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 II. Ore deposits

Collection:: Economics Books

56 ECONOMIC GEOLOGY occurs with ultra-basic rocks, as in the Urals, and in quartz- veins. It is widespread in the Eastern Highlands of Aus- tralia and is found in New Zealand. Platinum is usually obtained from alluvial deposits, in which it collects owing to its heaviness and resistance to weathering. Some alluvial platinum is derived from sedi- mentary rocks, as from slates in Germany and New South Scale In Miles cz 4 8 — LB a] i - | Hg T 5 2) Tuffoig Schr. ephyrtes... FT23 Dolomiti Umeszone, TTT Duke ant... EE pyronenite. SS otivine - Gatbro IZ Phas [52] Ata. L220) tower Devonian other feridotites Fic. 23.—THe PraTiNuM PLaceERs oF THE Is River. The platinum placers of the Is River, the Urals, after N. Vuisotzkii, 1913. (Ghor = mountain} The district is around 582° N., 503° E. Nigha Wales; but most of it has been derived from basic and ultra- basic igneous rocks, and especially from the chromite-olivine rock, dunite. Urar MountaiNs—The platinum deposits of the Ural Mountains are the most important. Those mountains con- sist of pre-Paleozoic gneiss, schist, and quartzite, followed by marine Devonian, Carboniferous and Permian. The igneous

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