| Dulong ore area lies in southwest of Laojingshan granite body,It is the most important region of Laojingsan ore-concentrated area,and where is an important polymetalic super-large deposit in the southeast of Dian mineralized zone.The zinc metal of this deposit reserves overtake 3,900,000 tons,it is occupied 97% of total zinc of Laojingsan ore area, tin metal reserves over 360,000 tons,which occupies 80% of total tin metal of Laojingsan ore area,and indium metal reserves overtake 5000 tons,it is almost the total amounts of Laojingsan indium metal. Zinc and tin metal deposits have reached a super-large deposit standard, and is also associated with copper, silver, cadmium, gallium, iron, sulfur and other metals. So super-amounts polymetal can migrate and gather here,and form super-large industrial deposit.It is a representative deposit in southeast mineralized zone.This study begin from tectonic,and more from Earth tectonic,regional tectonic,mine tectonic and the view between macro and micro points, to discuss the relationship between tectonics and mineralization. By comparision and contract among three super ore-concentrated areas (the other two ore areas are Gejiu mine and Bainiuchang mine), to find out the relationship and metallogenic regularity under deep crust among three mines. from the study of different mining era and the different geological conditions, and application of structural geology, historical, isotope geochronology, petrology, economic geology, geochemistry, mineralogy and so on, to research the relationship between mineralization and tectonics from the way of Multidisciplinary research. And study Dulong mine more basing on the structural geology.In the study, the east part of Honghe fault in southeast of Dian is devided into three secondary structural units. We study each unit and find out mineralized characteristics of each unit and relationships between near blocks. And to reveal the relationships between mineralization and tectonics of Dulong super large polymetallic deposit. Through research, the main progress and results obtain as follows:1. Dulong mine and Bainiuchang mine are in the same block of Bainiuchang—Dulong block unit, The west boundary of the units is Mengzi-Pingbian fault, and the east boundary is Wenshan-Malipo fault.In the processing of extrution between nearer blocks,it caused granites rising up NW—SE direction and mineralization of granite.The effect of imbalance shere forces produces two groups of faults,and forms mesh block unit.2. The folds have effects to control the formation of orebodys and their spatial distribution,there are thick and large orebodys in the turning parts of folds.3. In mine area,the structure of faults contr the formations of orebodys and its spatial distributions obviously,90% metal in the mine exists the part of acute angle of intersection of FO and F1. The faults control the distribution of orebodys from plane and section.4. The structure of granite has a significant effect to control the formation of orebodys and its spatial distribution,orebodys which occupy 90% of total metal in Dulong mine are distributed top of granit spine-like uplift5. In the deposition process of the stratum of TianPeng group of Cambrian,it occurs mineralization of Submarine exhalative, then take place Metamorphism,and formed early Mineralized zone in the stratum.6. The tests of Isotope geochemistry to the granite rock and metal minerals of ores reveal that main ninerals born time were same age, as well as the high grade elements in granite, iddicate that the main metal elements come from granite7. Causes of formation about super-large deposit are the coupling of multi-factor, make super large mineralized metal elements were moved here and formed super large deposit in the strata. |
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