The Research On The Location Prediction Of The Reserve Resources Of The Large-Scale Ore Concentration Area

The research content of dissertation mainly connects with the expert research item "The deepfine structure and mineralization research of large ore concentrated area" (NO. 1212010561607)that belong to "The ore exploration model and technical method for important ore belt in China"support by technique and international cooperation department of The Ministry of Land andResources P.R.C.Large ore concentrated area are important base of mineral resources output and it have quiteimportant meaning for national economy development. Many exploration case proved that therehave more potential for find new ore deposit and expand resource reserves in the depth andperiphery of old mine or old concentrated area. Strengthen research and explore assessment forsubstituted resources of ore concentrated area is a key approach to expand mineral resourcesreserve and it also have important meaning for decrease resources crisis of old mine.The focus of location and prediction research for substituted resources is how to seek lieconcealed ore and how to locate and forecast lie concealed ore. According analysis of internationalresearch development about concealed ore location prediction and the development progress ofconcealed ore since 1949, it indict that theory research about concealed ore in China is the basic ofsynthetically technique application for ore locate and predict. Nowadays, it in dire need ofintegrates with ore forming theory to strengthen the research of synthetically method optimizecombination.Though summarize and discuss concealed ore exploration and large scale ore location andprediction, the basic thought for concealed ore exploration was expatiated like follows: first ofall ,it should strengthen basically geological theory research and expand newly ore explorationthought, second insist use synthetically methods to explore ore and take full advantage of newapproach and new technique. A idiographic approach for large scale concealed ore located andpredicted was discussed and a suggestion that synthetically geophysical method should strengthenin middle scale (1:50000) and large scale (1:2000 to 1:10000) synthetically solid geologicalmapping.3-D solid geological model of Shizi mountain deposit in middle scale (1:50000) andDonggua mountain deposit in large scale (1:10000) was set up.According distributing of mine deposits, from west to east, there are five large mine depositin Tongling large ore concentrated area: Dongguan mountain deposit, Shizi mountain deposit,Xinqiao deposit,Fenghuang mountain deposit and Shatanjiao deposit. In these ore deposits,Shizimountain ore deposit is one of the deposits that be researced more advantaged in China presentlyand it is a ideal site for concealed ore location and predict research.Magma intrusion and ore deposit output mainly controlled by west-eastern basement faultand east-northern structure on base floor. In ore field and deposit scale, Tongling ore depositslocate in the structure which pattern named "row-line-cluster" in shallow crust belt and thisstructure style is the most important structure mechanism for fluid ore deposit forming. The bestCombine of different scale ore-controlling structure is main mechanism of this type ore depositforming. According to ore-controlling character, ore field structure can be divided into three types:first, "row-line-cluster" structure type in shallow belt, second, magma intrusion contact structuresystem in middle belt, three, "depression above swell" structure in deep belt. These three type beltdepth partly in 0-10km, 1-3km and more than 3km and composing ore field structure plumbdivided in space. In different ore field there have different combination of shallow, middle anddeep ore-controlling structure bundle, intact ore field structure vertical zoning was forming when these three belts completely output.The mineralization geological condition, cause of deposit formation about Tongling ore fieldwas analysesed and the relationship between ore-controlling structure (stratum, rock body andstructure) and concealed ore was confirmed. Though anatomize typical ore deposit such asDonggua mountain ore deposit and east Shizi mountain deposit and research mineralization modelwhich already be set up such as "multistory " and "multi-phase centralize on one body"mineralization patterns in Shizi mountain ore field and integrate with geophysical andgeochemical character , the method and symbol for ore exploration by geophysics andgeochemistry was summarizedThe main content of this research based on basically geology and geophysics andgeochemistry research and according with geophysical exploration result. Combine with researchresult in hand and use and introduce into new method and new instrument such as highresolution seismic and electromagnetism to research concealed ore, at the same time ,we pay moreattention to assess old resource and research location and predict of concealed ore in coveredarea.Though analyses deep seismic reflect profile that lasting 60 km and synthesis interpretexploration data, we find that Tongling ore deposits have double layer crust: crust thickness about31-33km and low crust thickness change mostly from 10km to 20km.Low crust in deposits northpresent multi-group stronger reflection layer which incline opposite and it is the directnessevidence of magma intrusion many times.A giant stronger reflection bundle was funded between up and lower crust (4-7s,TWT) in oredeposits, it confirmed that there exist large scale detachment belt. This belt create space conditionfor magma intrusion and magma room develop and then forming giant vault batholiths under oredeposits.Arc reflection caused by fold, break and intrusion structure was found in up crust in Tonglingore deposits and under complex arc reflection exist reflect transparency area, it confirmed shallowlayer exist giant magma room. The mathematic simulate result show magma intrusion movementthat begin from shallow giant magma room, in large scale, magma centralized in centre in deepcrust and expand to slide in shallow crust. This giant magma room basically controlled Yanshanperiod structure-magma-fluid metallogenetic action in Tongling ore deposits.Through research of high resolution seismic and tomography image on Shizi mountaindeposit, space layout shape of mineral layer and mineral structure of deposit(such as Wutonggroup tip) was find out primaryly, it have important directional meaning for deep ore exploration.We find up crust cover layer became non-coupling distortion and detachment belt between layerswas formed in the course of strong-weak layer distortion. We also discover detachment beltbetween layers is the key channel of low viscidity magma and mineralize gas and fluid.Magnetism and gravitational modules for concealed ore location and predict was set up basedon synthesis analysis and research about geophysics and geochemistry on Shizi mountain deposits.New high resolution gravitational, magnetism and electrical methods for deep and surroundconcealed ore exploration was exerted in predict area and according exploration result threepredict target area for next large scale exploration work was bring forward,there are Wulimountain target area,Qianchong target area and Guihuachong target area.According research on anciently exploration approach and method in Shizi mountain orefield and integrate with synthesis geophysics and new method application, a principle of method select and combination for deep concealed ore location and predict was discussed in thisdissertation, At last, it point out that high resolution and deep exploration method is important andsynthesis exploration methods combination also necessary.