| 广东凡口铅锌矿床成矿构造动力研究 |
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| RESEARCHES ON ORE-FORMING TECTONIC DYNAMICS OF FANKOU LEAD-ZINC ORE DEPOSITS, GUANGDONG |
| Fankou lead-zinc ore deposits located in the northern active margin of Qujiang-Renhua tectonic basin. During the developing processes of the reginal vortex structure, brougth about a set of nappe or decollement structures, formed NW.NNW deep-cutting fractures and folds, "curviplan'ar fractures" which resulted from compounding of EW. NE and SN faults in Fankou ore district, both of them belonged to compresso-shear and tenso-shear volute structures of the vortex structure separately, they constituted the most important metallogenic and ore-housing structure system. The flowing and sinking effects of the vortex structure led to a series of tectono-magmatic activity,petrogenesis and metallogenesis,especially,the last episode of Hercynian Orogeny and Indosinian Orogeny offered driven force for the mobilization and metallization of lead-zinc ore-forming substances. Compressing and shear-gliding causing by metallotect features resulted in enrichment of ore-forming substances in fault blocks by tectono-adjustment: lead enriched in the centre of shear zone, zinc enriched in the margin. Injection of Yansha-nian magmatic hydrothermal solution, superimposition of U-Th-Pb radioactive substances, metamorphism resulting from tectono-thermal events in the ore district, tectono-annealing and displacement in solid state, all of them as metallotectonic force or agency, reformed antecedent ore bodies or protore and made them more enriched, eventuall formed rich ore cluster depending on curviplanar fractures and filling into interlayer-gliding faults.The research achievements on tectono-geochemistry, lead isotope, sulfur isotope, carbon, hydrogen and oxygen isotope, rare earth elements, composition of inclusion water and kerogen, petrofabric analysis and metallogenic simulated experiment focused on a conclusion of that a series of magmatic hydrothermal activities and metallizations causing by tectono-dynamic effect, formed unique Fankou Pb-Zn enrichment ore deposits. The mineralization of Fankou ore deposits had its own articularities. In the metallogeny series of Mississippi-Alps-Ireland-Kuroko or Besshi types of lead-zinc ore deposits, can not including all of the characteristics of Fankou deposit, comparatively, Fankou deposit was more similar to Missisi-ppi-type compared with others. The metallogeny proccess of Fankou deposit may like this, on the basis of ore source bed or protore produced sedimentary refor med lead-zinc enriched ore deposits by tectono-dynamic effect, magma hydrothermal activity and metamorphism. The tectono-dynamic effect is one of important metallogenetic factors which can not be ignored. |
| QIU Xiao-ping.1991.RESEARCHES ON ORE-FORMING TECTONIC DYNAMICS OF FANKOU LEAD-ZINC ORE DEPOSITS, GUANGDONG[J].Acta Geoscientica Sinica,12(2):57-72. |
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