Zeitgebundene Erzlagerstätten |
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| Authors: | Prof Dr-Ing Albert Maucher |
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| Institution: | 1. Institut für allgemeine und angewandte Geologie der Universit?t, Luisenstr. 37, 8 München 2
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| Abstract: | Proceeding from the observation that in the Early Paleozoic there is a time-bound, world-wide distributed ore deposit type with scheelite in volcanic-sedimentary series, the question concerning a systematic development of ore deposits connected with an evolution of the earth's crust and mantle is discussed. A schematic model of this development is constructed, which, beginning with a still thin, primeval crust, by way of time-bound stages as for instance greenstone belts and mobile zones, receiving abundant material introduction from juvenile volcanism accompanied with corresponding time-bound ores, leads to the “Assynthic” revolution, giving rise to a crust which is essentially dependent on selfsupport by sedimentary reworking and palingenic magmatism. During the initial “juvenile” period as well as during the palingenic there is significant participation of sedimentary processes, in dependence upon time-bound evolution of the atmosphere and biosphere, for material transport, redeposition and renewed concentration. During the “palingenic” stage the crust is only episodically supplied with mantle material along world-wide volcanic, tectonic lineaments, whereby new ore types, for example the scheelite ores of the Early Paleozoic or the copper-molybdenum ores at the Mesozoic-Cenozoic transition, experience their time-bound formation. |
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