Gejiu tin ore deposit is a famous tin-polymetallic deposit in the world because of its enormous metal reserves. Besides tin, there are copper, lead, zinc, silver, iron, sulphur, tungsten, bismuth, indium and rare earth elements. It was believed that there mainly are skarn-type tin deposit, stratiform tin deposit and basalt-type copper deposit in Gejiu tin orefield. The stratiform tin deposit are distributed in Lutangba, Malage and Huangmaoshan, which are hosted by carbonate rocks of Gejiu formation in Middle Triassic Series. 40Ar-39Ar dating of cassiterite from the sratiform tin deposit in Lutangba yields plateau age of 202.18±2.35Ma and isochron age of 206.81±3.23 Ma respectively. The ages are obviously older than those of the ore of the skarn type deposit of the Yanshanian epoch.The mineralization is the seabed exhalative hydrothermal sedimentary mineralization of the Indosinia epoch.
Orefield structures of Fankou lead-zinc deposit in Guangdong province is complex and have been argued about for years. On the basis of the theory and method of the geomechanics, the mechanics features of structural planes of the structures of Fankou lead-zinc orefield have been identified. Its indicated that its structure is divided into three types of systems, that is, the northwest trending structural belt which origin from the Caledonian stage to the Hercynian stage, the Lambda-type structure which origin from the Indo-Chinese stage to the Yanshan stage and the eastweat trending structural belt which origin the Himalayan stage. The lambda-type structure made of major fault of F203 of strike northwest and branch fault of F3, F4 of strike northnortheast is identified as the structural system of mineralization.
It had been believed that the genesis of tinny granite in Gejiu tin ore deposits were hydrothermal mineralization in granite of Yanshanian epoch by most researchers for a long time. However, according to the form, attitude and sulphur isotope in the ore of the oreboby, the authors believe the genesis of the tin ore deposit is relict body of granitic superimposed ore-forming of the Yanshanian epoch after the basic volcano ore-forming of the Indo-Chinese epoch. It’s proved that the form and attitude of the oreboby is basically consistent with the form and attitude of the basalt of the Indo-Chinese epoch. Because sulphur isotope in pyrite of the ore is from 0.21 per thousand to 4.4 per thousand, feature of source of the mantle sulphur isotope is reflected.
According to the analysis of geological characteristics and Elemental correlation charac –teristics, Threshold and R-factor analysis leading to the results geochemistry characteristics of Kanmashan Pb-Zn polymetallic deposit which is located in Lancang county of Yunnan province, the deposit is discovered in the southern arc of Chong mountain-lincang-menghai mountain, alonging the contact strip of Lincang granitoid batholith and proterozoic group in LanCang, metallogenic conditions near fracture is relatively ideal, which can be used as a further work area.
Orefield structures of Fankou lead-zinc deposit in Guangdong province is complex and have been argued about for years. By means of comprehensive study of indoor and outdoor,The lambda-type structure made of major fault of F203 of strike northwest and branch fault of F3, F4 of strike northnortheast is ore-controlling structure, which not only controls the shape, the occurrence and spatial distribution of the ore body, but also controls the formation and distribution of the deposit.Key region of next prospecting is near fault of northnortheast direction of hangingwall block of the F203.Key words:Pb-Zn ore deposit;Ore-controlling structure;Fankou in Guangdong Province, China
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