| 沉积矿床成矿时代的地史意义 |
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| 引用本文： | 叶连俊.沉积矿床成矿时代的地史意义[J].地质科学,1977,12(3):210-218. |
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| 作者姓名： | 叶连俊 |
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| 摘 要： | 地质工作者研究矿床的意义,不仅在于认识矿床的形成与组成,不仅在于说明矿床的存在状况,还在于深入矿床的本质,指出找矿预测的途径;结合生产斗争实践,为社会主义革命和社会主义建设服务。
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| 关 键 词： | , |
THE HISTORIC-GEOLOGICAL SIGNIFICANCE OF SEDIMENTARY ORE GENETIC EPOCHS |
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| Yeh Lientsun.THE HISTORIC-GEOLOGICAL SIGNIFICANCE OF SEDIMENTARY ORE GENETIC EPOCHS[J].Chinese Journal of Geology,1977,12(3):210-218. |
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| Authors: | Yeh Lientsun |
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| Abstract: | The present paper considers problems on the laws of ore-genetic epochs from a historic-geological point of view. The author confirms that sedimentary mineral deposits are nothing but a special kind of sedimentary facies, a sort of mineralized lithesome akin to their environment of deposition, being the natural products of definite episodes of crustal evolution. An understanding of this problem could be found from the contradictoriness within the inside of things, i. e., their motion, development, and interrelations with each other. Sedimentary ore deposits are mostly formed in company with epeirogenic or eustatic movement and occurred generally in platform territories, whereas ore deposits of magmatic affinity largely came into being during orogenic episodes and distributed in orogenic belts. In the Chinese geological history, 4 main sedimentary ore genetic epochs can be recognized. These ore genetic epochs could be ascribed to the output of the struggling between the variations of the hyper-gene geological environments vs. the evolutional events of the deeper crust. In every of these 4 ore genetic epochs there is a quite similar ore genetic sequence. Although all the sequences of the 4 genetic epochs are not quite the same, their general tendency of evolution is more or less identical. Mineral deposits that were formed in the early part of the ore genetic epochs, such like iron and manganese ores, are mostly "eusta-tic deposits", being formed during transgression of the sea; and those formed in the later part of the ore genetic sequences are mostly "epeirogenic deposits", being formed during regression of the sea. "Transgressive ore deposits" are generally formed in "antecedent basins", and "regressive ore deposits" are generally formed in "syn-genetic basins". According to the Chinese experience, in the searching of new sedimentary mineral deposits, it is advisable to follow the surface of basal uncomformities of the formations lying directly upon an oldland.With an insight of the historio-geological background of the constitution of Chinese sedimentary ore genetic epochs the author was able to set forth the theory, that the genesis of a sedimentary mineral deposite is not simply the product of sedimentary differentiation. The complete story is actually: "weathering differentiation" at first, then "sedimentary differentiation", and finally "diagenesis differentiation". |
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