| 论苏州高岭土的成矿地质作用 |
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| 引用本文：.1985.On the Kaolin mineralization in Suzhou[J].Mineral Deposits,4(2):58~68 |
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| On the Kaolin mineralization in Suzhou |
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| Abstract:The Suzhou Kaolin is famous all over the world. The ore deposits are controlled by the overthrusts and shear faults developed in Yenshanian period; the fracture zone is just the mineralized zone; the long-term thrusting and multi-stage shearing, sheet loading, mylonitization and related recrystalIization offered the necessary temperature and pressure; fracture zone, texture and sti ucture of tectonite, especially the footwall of calcareous rock, constituted the favorable media for hydrochemical circulation. In this paper, the combinalion of processes resulting from tectonic conditions such AS disintegration, dissolution, transportation, deposition, metasomatism and recrystallization of aluminosilicate is called tectono—geochemical process．In this process，the tectonic desilication and the relative enrichment in aluminium provided material for the kaolin mineralization. the negatively charged silicate colloform usually migrated together with the absorbed ferruginous substance and deposited in the ferri-siliceous mylonitic puddingstone. Depletion in alkali offered acid media for kaolinite mineralization. The tectonite type of kaolin contribute more than 90％of the total reserve. The orientation structure of ores iS regarded as the typical characteristic of the tectonite type of kaolin. Scaly kaolinite are oriented. Each model of formation generates a distinctive texture characteristic of the corresponding environment. Hydrothermal activity occurred at the contact zones of both vein rocks and subvolcanic intrusive. The desilication dealkaIization and aluminum enrichment caused by the hych-othermal circulation are also called the tectonic geochemical process. The porphyry type of kaolin is developed at the leucoaltered contact zone. Alunite and pyrite are always associated with the kaolintc, thus lowering ore quality. In summary, the tectonic mineralization and hydrothermal circulation are the main processes of kaolin mineralization in Suzhou. The hydrothermal circulation, however, is limited in scope, and the related porphyry type of kaolin makes up only about 10％ of the total reserve. |
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