| Duobuza copper deposit area is located at the southern margin of the Qiangtang-sanjiang composite ground plate, the north side of the Bangong-Nujiang suture zone, belongs to the Bangong-Nujiang copper gold polymetallic metallogenic belt in Duolong ore concentration area. With the progress of the exploration work, Duobuza copper deposit has become a public representatively large copper polymetallic deposit in Bangong-Nujiang metallogenic belt.Deposit area is a set of bathypelagic-basin-clastic rock flysch formation,has been passive state continental margin surroundings.The main geology elements in the deposit are Sewa group of the middle-lower Jurassic of which the lithologyis feldspathic quartz sandstone, Tiegelong group of the lower Cretaceous of which the lithology is andesite, Kangtuo group of the Paleogene Oligocene of which the lithology is glutenite, granite diorite porphyry, diorite porphyrite and gabbro, intermediate-acidic intrusive rocks of which the lithology intrusive rock and extrusive rock such as basaltic andesite.Alteration development in the deposit, identify the potassium, silicification, sericitization and epidotization, chloritization, Angle lithification, etc., and zoning phenomenon;Alteration range and degree of the rock mass scale, occurrence, shape control, such as alteration type, the strength and the center of the rock mass from south to north wide narrow phenomenon;Mineralization is mainly produced in potassium silicide,clay Angle of belt and lithification, specific distribution in porphyry granite and strata within the contact zone;Disseminated, veinlet-net vein pyrite and chalcopyrite is given priority to a small amount of magnetite, bornite, molybdenite.Through the drilling of engineering control stripe stereo parsing, ore body overall nearly east-west, tends to the south, cylinder shaped, south-central thick, to the north of thinning and pinchout gradually, on the projection plane form rectangular shape, east-west length about 2.4 thousand meters, north and south about 0.6~0.9 thousand meters wide, roof and floor of ore bodies is volatile.Direction of ore-forming elements in the plane, things, the average grade of Cu, Au change is bigger, the Midwest high and low on both sides of things, the thickness of the mineralized bodies in the thickest in the Midwest, central times;Up north and the south, the average grade of Cu, Au change law is relatively obvious, north-central significantly higher Cu, Au.Cu, Au element thick heart centralization in the Midwest 23 Central Line, 07-00-08 line between.Ore-forming elements in vertical, the non-uniform change trend overall, Cu, Au grade change is bigger, porphyry and ore-forming elements gathered near contact zone, high grade, grade is relatively low in variable sandstone;Cu, Au, average highest grade between 4.9~4.95 thousand meters deep to present the change of the uneven, suggested the mutiperiodic mineralization characteristics.More complex of intermediate-acid intrusive rocks in the mining drilling control mineralization occur in common.Realized the intrusive rocks, mainly in mining area in the Midwest a north-south west to east on the strip, with many not miscellaneous mining area of intrusive rocks are mainly distributed range is consistent;And intrusive rocks of the accumulative mineralization total thickness accounted for 48.9 percent of the total thickness of mineralization.Feldspar quartz sandstone are widespread mineralization phenomena, Feldspar quartz sandstone thickness of mineralization of mining area, 53.36 percent of the total thickness of the mineralization.Feldspar quartz sandstone of mineralization mainly occurs in the intrusive rock mining area emplacement near the contact zone, shipped to sandstone with magmatic hydrothermal ore-forming hydrothermal mineralization. |
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