| 广东凡口铅锌矿床成矿构造动力研究 |
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| 引用本文：邱小平.1991.广东凡口铅锌矿床成矿构造动力研究[J].地球学报,12(2):57-72. |
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| 中文摘要:凡口铅锌矿床位于粤北曲仁构造盆地的北部活动边缘,区域的旋涡构造与矿区弧形构造为对应的重要成矿构造。矿区辉绿岩属成矿前海西期基性岩墙,是大规模构造岩浆活动和成岩成矿作用的前峰。成矿作用主要发生在印支—燕山期(192—85Ma)。通过构造变形史与成矿期对比分析、构造热变质与退火作用、固态位移及铅锌在构造带中富集规律的研究表明:构造运动是成矿作用的主要动力。作者通过干体系高温高压成矿模拟实验,成功地获得人工糜棱岩和微粒方铅矿,而且铅锌在流变过程中趋于在糜棱岩带中富集,证实构造应力能够驱动成矿元素迁移富集,这对于成矿构造和矿床成因理论研究无疑具有很重要的贡献。 |
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| RESEARCHES ON ORE-FORMING TECTONIC DYNAMICS OF FANKOU LEAD-ZINC ORE DEPOSITS, GUANGDONG |
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| Abstract: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. |
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