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Main characteristics of mineral-forming conditions of chief mineral deposits in China

Main characteristics of mineral-forming conditions of chief mineral deposits in China

Kexue Tongbao(Sci Abstr

The type, scale, and distribution of the known endogenous ore deposits in China are closely related to the geological structures, the magmatic activities and the characters of country rocks of those regions where the deposits occur. Regular zoning patterns are often observed. In China, the exogenous mineral deposits formed in or prior to the Triassic period are of marine origin; those of the post-Triassic period are of continental origin. The important marine mineral deposits of geosynclinal type are mainly formed in the early periods of some geological 'eras,' while those of platform type, in the late periods of the same geological 'eras.' The deposits developed in the sediments of retrogressive sequence, such as salts and copper-bearing sandstones and shales, are chiefly concentrated in Permian and Triassic, i.e. the closing periods of the whole Palaeozoic marine transgression. Of continental mineral deposits, coal, salts and copper-bearing sandstones and shales are more important. The main characteristics of mineral-forming conditions of chief endogenous and exogenous mineral deposits in China can be generalized as follows: (1) The mineral-forming processes develop under the alternative actions of active and relatively stable geological tectonics. The relatively stable periods subsequent to the mobile tectonic movements seem to be more favourable to the formation of economic mineral deposits. (2) Active tectonic movements, in most cases, give rise to conditions favourable to the scattering and transportation of the useful elements while the relatively stable conditions are more favourable to the gathering of the elements. (3) In mineralogenetic epochs, it is characteristic that the formation of economic mineral deposits by stages is in connection with the poly-periodical mineralizations. The significant economic mineral deposit is formed at a certain stage of geological development within a certain region.

Accession: 019361999

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