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- W2017403025 abstract "Copper-bearing provinces of the world are typed according to occurrence. The seven categories range from Cu-Ni deposits in basic and ultrabasic (igneous) rocks to sedimentary deposits in sandstones. Vein and extrusive igneous occurrences are noted of “less practical importance”. The source of Cu is held to be the sial corresponding to its affinity for sulfides. Cu deposits in mobile zones are treated according to time of formation (early, middle and late), relative to the development of each zone. Cu content is usually lower than Ni in platforms; in geosynclinal belts the reverse is true. Precambrian Cu deposits are thought to follow the same laws as apply to younger formations, but absence of a clear record and greater metamorphism thwart definitive conclusions. Numerous parallels do exist, however, and both exogenic and endogenic types occur in various ages. No worldwide epochs of Cu-formation exist, although intensive periods of tectogeneses (Caledonian, Variscan, Alpine) have witnessed more mobile zones, and hence more Cu concentration, at nearly the same time.—A. Eustus." @default.
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- W2017403025 date "1962-03-01" @default.
- W2017403025 modified "2023-09-27" @default.
- W2017403025 title "BASIC FEATURES OF THE METALLOGENY OF COPPER" @default.
- W2017403025 cites W2003071105 @default.
- W2017403025 doi "https://doi.org/10.1080/00206816209473685" @default.
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