The Enrichment Regularity And Metallogenic Prognosis Of Vein No.320in Damoqujia Gold Deposit In Longkou County, Shandong Province

Damoqujia gold deposits tectonic position located in the western Pacific Oceancoast-Cenozoic continental margin active band, uplift northwest Jiaobei East Shieldof North China platform Lu Dong, east of Yishu deep fault and the northern section ofZhaoping fault. The vein302of Damoqujia as the largest and most important goldorebody in industrial veins and peripheral importance of deep geological studies havebecome increasingly obvious, It became an important part of prospecting work andincreasing reserves that looking for possible new industrial ore mining. In order tofind out the mineralization enrichment regularity of Damoqujia302vein gold depositsand evaluation of the deep exploration prospects, On the basis of a large number offield geological work, through the system to collect, collate and summarize the resultsof previous work and understanding, combining fault simulation with orebodyposition indicating system (OPIS), metallogenic prediction theory as a guidance,author comprehensively research the discipline of mineralization enrichmentDamoqujia gold deposits, and conduct prospecting prediction with the deep orebodyof the vein302.By systematically studying the alteration zonation of Damoqujia gold deposit，author suppose that it exist pyrite-sericite quartz zone，sericite quartz zone，silicification zone and potassic alteration zone with the major orebody as the center outward，it become lower about fragmentation degrees and mineralization degreesfrom center of fault to outward. Gold orebody hosted in footwall of fault belt，but noindustrial mineralization in hanging wall.Damoqujia gold deposit has obvious characteristic that multirank structural orecontrolling，302vein controlled by Ⅰgrade fault tectonic，industrial ore-body mainlylocated in footwall from0m to-80m.Tectonic zoning, alteration zoning andmineralization zoning are symmetry, it appear a characteristic of trinity. Intenselyalteration zoning (pyrite-sericite quartz zone) is corresponding with deformationzone(cataclastic rock zone), and it is also mineralization belt(high grade ore-body).Author summarize the regulation by deeply analyze output and distributionfeature of302vein. Industrial ore body of Damoqujia gold deposit output controlledby fault section attitude alteration, mineralization enrichment position located in steepdip angle fault or gently to steep fault, and NE trend or NNE fault.Orebody mainlyoutput in footwall of major fracture plane that is strongly stress deformationpyrite-sericite quartz alteration and granitic cataclastic rocks, and has a distance tomajor fault. Gold mineralization has obviously segment enrichment tendency in space.In vertical direction, the first enrichment segmentation above-380m,the secondenrichment segmentation from-420m to-650m.On trend, gold mineralizationenrichment section distribute in72to76line,78to82line,84to86line and92to98line.By the means of orebody position indicating system, The comprehensivelyanalysis of mineralization index variation tendency orebody thickness, gold grade，m·g/t and alteration zone thickness in area of ore body in the vein302and mine field.Mineralization enrichment section of vein302in Damoqujia showed NE lateraltrending, plunge angle is60°metallogenic tectonic environment,According to faultsection attitude alteration trendency in advantaged metallogenic tectonicbackground,we marking out3prospecting target areas.in the depth of vein302,estimate9462kilogram metal quantity. Ⅰtarget area located in the depth oforebody302-1of Damoqujia gold deposit， line from76to88and elevation from -600m to-1000m，area is195000m2，predicting2184kilogram metal quantity. Ⅱtarget area located in both sides and the depth of orebody302-1of Damoqujia golddeposit，line from90to104and elevation from-200m to-1180m，except verificatedarea，area is382000m2. Ⅲ target area located in the northeastern part of orebodydeeply，north of the line106，elevation from-420m to-1300m，area is268000m2inthe deposit area，3000kilogram metal quantity.