Changdu Prefecture Regional Geochemical Weak Information Extraction And Evaluation

Changdu Prefecture in Sanjiang basin, is an important ore-forming units in theSanjiang metallogenic belt. Papers in the study area selected from the northern part ofthe Changdu Prefecture. range from96°to99°E,30°to32°W. consisting of nine1:20million maps were: Leiwuqi mapsheet (H4701), Laduo mapsheet(H4702),Degemapsheet (H4703), Luolong mapsheet (H4707), Changdu mapsheet (H4708),Baiyumapsheet (H4709), Basu mapsheet (H4713), Chaya mapsheet (H4714),Xiongsongmapsheet (H4715).Papers on Ag、 As、 Au、 Bi、 Cu、 Fe、 Hg、 Mo、 Sb、 Sn、Pb、 W、 Zn, Element for into mine sexual analysis, research and focus solutionhas following problem:①Background and abnormal division of the lower limit of;②complex geological context of the geochemical anomaly extraction andrecognition;③explore the identification of weak information;④known depositsand geochemical anomalies in the spatial relationships;⑤The exception causes;⑥in the analysis of geological background and metallogenic condition abnormalinterpretation, evaluation, delineation of the prospect area.Research area by the Kekexili-JinShajiang combined belt,North-Qiangtang-Changdu Land-mass, Shuanghu-North-Lancangjiang Land-mass,South-Qiangtang-Zuogong Land-mass, the Bangonghu-nujiang River Land-mass, theGangdisi-Chayu land-mass composed of plates. composed Bangonghu-Nujiang faultzone, the Chibuzhangcuo-Lancangjiang fault zone, the Kekexili-Jinshajiang faultzone throughout the study area. Research area of outcropping strata up to120, plusthe role of magmatic rock, very complex geological background in the study area. Issuch a complex geological backgrounds to create a unique ore-forming conditions ofthe study area, study area is very rich in mineral resources, Yulong copper (molybdenum) deposit is China’s second-largest copper mine, located in JomdaCounty within the study area.Through the study area, the1:200,000stream sediment sampling data statistics,within the study area As、 Bi、 Cu、 Fe、 Sb、 Zn Elements background valueis higher than the high background values and background values of stream sedimentsin China; Ag、 Au、 Hg、 Mo、 Pb、 Sn、 W Above background values ofhigh background values below background value of stream sediments.According to the principle of "abnormal promoter region lining the lower limitvalue filter", the study area was divided into51geological sub-areas, in accordancewith the EDA technology are the statistics of each sub-zone of the median and ondifferent points, and the promoter region of the median and different point ofprocessing by rows of data filtering, as the geochemical background and anomalieslower limit so that the background and abnormal lower limit of the discontinuoussurface, End Sub line values.(the original gridded data/grid exception under thelimit) to the delineation of geochemical anomalies.Geochemical background showed that: the relationship of the known deposits ofFe mineralization is closely related to the level of background, the background ofhigher favorable mineralization; Ag、Pb、Zn、W、Sn in areas with relatively highbackground in favour of mineralization; Au, Cu and Mo mineralization and thebackground has little to do. The abnormal relationship of the geochemical background:the exception of Au, Ag, Cu, Mo, Pb, and Zn elements no obvious relationship withthe level of the background; abnormal distribution of the elements of W, Sn, Bi in therelatively high background; Fe anomalies are mainly distributed in the highbackground area; of Hg anomalies are mainly distributed in the place of thebackground gradient."Abnormal promoter region of lower contrast filtering method" to filter outlining the value of Ag, As, Au, Cu, Fe, Hg, Mo, and Pb, Sb, Sn,, W and Zn insingle-element anomalies and extract out of Ag-Pb-Zn, Cu-Mo, W-Sn, Hg-As,Cu-Mo-W-Bi-Au, Ag-Pb-Zn-As-Sb-Hg combination of elements lining value. Theseanomalies and ore deposits (Mine sites) anastomosis of high, not found in depositshave abnormal have better prospecting potential."Analysis of weak information processing technology" ruled out the interferenceof geochemical background, has demonstrated a strong ability to identify thegeochemical exploration weak, for finding weak mineralization information deposits(Mine sites) and concealed deposit has a very good indication.Research area copper mines in accordance with the principles of classification of abnormal class (Cu-Mo-W-Bi-Au) Combination of contrast anomalies andsilver-lead-zinc polymetallic ore deposit (Ag-Pb-Zn-As-Sb-Hg) Combined liningvalue Exceptions are divided into A、 B、 C Three types of exceptions, itsevaluation and sorting of rows, based on the evaluation results of comprehensiveexceptions and Analysis of weak exception information, Division of A Types ofprospective areas for prospecting, B Types of prospective areas for prospecting,geochemical prospecting prospective areas and weak information Fe Prospectingprospective areas.