The Study Of Geochemistry Elements Combination Anomaly Seeking Model In Baishan Area

Prediction of mineral resources is a multi-disciplinary research in systems engineering.The prediction of mineral resources involves numerous geoscience information processing inversion analysis, the quantitative evaluation and the geologic interpretation question. The theory of anomaly seeking is one of the three prediction of mineral resources, and the geochemical anomaly analysis is an important content to promulgate the Geochemistry element spatial distribution rule, to determine the concentrated element and main ore forming element, to select the resources prospect area.Because the mineralization process has multi-period character and the polyphyletism, geological space which under the mineralization condition function is inevitably a complex geological structure , the geochemistry element spatial distribution also has the combination characteristic. The geochemistry element of mineralization , regardless in mineralization energy or in concentrates in the degree is imbalanced, in the space if causes certain land sector principal element to concentrate, auxiliary element comparative content low situation. Speaking of the hypogene deposit, the overwhelming majority ore deposit's mineral intergrowth combination and the element paragenesis combination are not sole. Therefore, using the data to seek different and even prospects in such inversion process, it must consider that the spatial combination relations of the element , the combination relations not only increased the information content, it also reflects the element the inner link simultaneously.Therefore, this article launches the discussion on the areal geochemistry element spatial distribution rule, proposed the different concept of the geochemistry elements combination, and has discussed its nature, namely the superposition,the zonation, the randomness, the analogy and so on. Meanwhile by Baishan area 1: 200,000 chemical element river system deposit metrical data is the application example, gains 6 608 samples according to five map sheet's data capacities to carry on really calculates the analysis, the 18 elements are as follows: Ag,As,Au,Bi,Co,Cr,Cu,Hg,Mn,Mo,Ni,Pb,Sb,Sr,Ti,W,Zn and Fe2O3.,we proposed and has established three kind of models: (1) factor–kriging model; (2) multi-dimensional sequence typical trend surface model; (3) the characteristic analysis and combination seeks the difference modelMaking use of DEM to above three kind of model computed result to carry on the three dimensional expression separately, which causes the region combination anomaly to be more direct-viewing, clear, obvious, advantageous to the tracing analysis. In model computational process, what combination anomaly manifests is under the multi-element interior related premise the polarization mechanism, thus represents the main mineralization factor. In model (1), on factor F1 has the high load element variable which includes: Co, Mn, Ti, Fe2O3, explained that this group of element basic degree is high, which belongs to the basic - ultramafic origin. On factor F2 has: Hg, Pb, Zn, they reflected the sulfide alteration and the halo-forming information, and it has reflected low temperature hydrothermal ore forming element Zn, the Pb accumulation mineralization process primarily. On factor F3 : As, Au, Sb, have reflected the low temperature hydrothermal ore forming element accumulation process. On factor F4 : Cr, Sr, Ni, Sr are created when the volcanic rock eruptions , which forms with the basalt result in Tianchi volcanic eruption in Baishan area, which showed that this part of elements concerns the basic, the ultramafic dark color volcanic rock class . On factor F5 : Bi, Cu, W, this group of element combination has reflected acidic rock mass related high temperature hydrothermal ore forming element Cu, W accumulation mineralization process, also possibly the copper tungsten ore existence symbol.By the multi-dimensional sequence trend surface model, we obtained that the 6 host mineralization factor which represent the majority of information reflects 6 kinds of combinations, the combination anomaly tallies basically with the result which analyzed with factor - kriging, including one kind of Pb, Zn, Sr, W the element combination anomaly demonstrated its particularity, which indicated that mineralization condition had the multiplex characteristic in this area, the obtained element combination anomaly from characteristic anatomic model and the combination type is extremely similar above.In the combination strives for in the different fundamental research, in view of the fact which weak exceptionally and low and drawn out exceptionally exists we have carried on the theory definition and the model discussion, maximum limit reduced the geological noise for the guarantee and highlights the combination to be unusual, constructs weak exceptionally enlarged in processing the smallest dimension anatomic model and under the information flaw condition enlarged model, intended to the atonement tradition the method flaw. Thus guarantee model forecast reliability and stability.In the article we carried on the summary and the discussion to the domestic present popular geologic anomaly theory, the mineralization series theory and the mineralization system theory, and have given the explanation to the above three kinds of theories with the element quota combination anomaly seeking theory and model, and as one kind of an attempt to the application of combination anomaly seeking.According to the tracing analysis to the result of theory of anomaly seeking and the three dimensional remote sensing image of the research block element space quota combination, the backward combination unusual source, provided the objective basis for selecting the resources prospect area. Meanwhile, we carry on the area belt divisionto to combines anomaly by the structure control relation. We carry on the data processing and the inversion explaination to the entire district 1: 200,000 voyage number data that we have discussed Baishan area old foundation geology basis, faulted structure rack, magmatic activity and so on . We carry on the connection the element quota combination with this area tectonic framework, and this geology background of combination abnomally for analysis.The result indicated that the old basis distribution shows the east to west distribution, the areal structure rack shows ne and nw trending fault structure connection primarily, na, nw, ns trending fault structure and their connection established the basic pattern of magmatic intrusion and the eruption activity. The advantageous mineralized spots are connection spot that under the aeromagnetic interpretation the depth portion linear structure and the cellular structure, cellular structure and cap rock, two group or many group of fault structure, basis block body and acidic volcano rock mass and so on.According to the spatial quantitative combination anomaly seeking analysis and traceability analysis, we selected 23 element combination anomaly area, found that every anomaly is big scale and high intension, the center is obvious. According to the structure control relations, we will divide all combination anomaly into 5 belts.Ⅰbelt is in the north research area, primarily are As-Au-Sb and Hg-Pb-Zn element combination abnormally ;Ⅱbelt is in the middle research area, primarily are Cr-Ni and As-Au-Sb element combination abnormally. This belt abnormally promulgates this belt for and basic, the ultramafic dark color volcanic rock class related element accumulation process;Ⅲbelt is in the southwest research area,, its appearing stratum mainly is the old range group stratum, the element combination abnormally are primarily As-Au-Sb and the Cu-Bi-W, in this belt abnormally revelation the low temperature hydrothermal ore forming element's accumulation process, in the mineralization the associated mineral has As, Sb;Ⅳbelt is in the southeast research area, its appearing stratum is mainly the basalt. Take the Co-Mn-Ti element combination primarily, this belt abnormally promulgates this belt should as to mineralize the mix belt which with basic-ultrabasic rock related Co, the Mn mineralization and Ti mineralize.Ⅴbelt is in the corner of southeast research area, its appearing stratum is mainly the basalt, primarily is Co-Mn-Ti element combination, its origin is similar withⅣbelt research area.