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Comparison of Geochemical Data Processing Methods

Author: JiangZhenNing
Tutor: ZhangShengYuan
School: Shijiazhuang University of Economics
Course: Mineral prospecting and exploration
Keywords: data processing fractal contrast filtering geochemical anomaly
CLC: P632
Type: Master's thesis
Year: 2012
Downloads: 61
Quote: 0
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The long-term practice experience indicates that geochemical exploration is anaccurate, efficient prospecting method. But how to scientifically and effectivelyextract the mineralization anomaly information and rapidly separate ore anomaly iscrucial to this. Geochemical background and anomaly classification, the lower limitdetermination of the anomaly, are important link of geochemical exploration in theexploration of mineral resources in order to extract geochemistry information relatedto mineralization from a huge number of geochemical data.Geochemical field is formed by the superimposing of different geology processes.For mineral exploration, besides the familiarity to Field value variation tendency,Field local variability and spatial structure information reflect a certain geologicalcontrol factors frequently. Geochemical data process aims at extracting anomalyinformation related to mineralization from the complicated and changeablegeochemical field.Tin-copper poly-metallic mining area in Geju city has a long history of miningdevelopment, famous with the world for tin production, thus Geju city is also knownas " Tin City". Besides tin, minerals mainly found are: copper, lead, zinc, tungsten andso on, more than20species. We collect the geochemical exploration materials ofmore than20elements in Geju city and neighboring area, using a variety ofgeochemical exploration methods, mainly focusing on the research of tin and copper,and fixing anomalies.Over the past ten years, people gradually realize the limitations of varioustraditional methods based on the classical statistical, and continuously propose certainnew methods and new technology to determine the lower limit of geochemical dataanomaly, such as: geochemical block, pan Kerrey lattice method, contrast filteringmethod, partition processing (unified background or varied background), the fractalmethod and artificial neural network and so on. The method to determine the lowerlimit of anomaly is various however each method has respective applicability andlimitations. This paper, based on the theoretical study of various above-mentionedmethods, combined with the actual situation of tin-copper poly-metallic mining areain Geju city Yunnan, applies traditional data processing method, fractal method, contrast filtering method to process the geochemical data of the research area,extracting of geochemical anomaly, comparing the applicable conditions of eachmethod.According to traditional geochemical processing method, if the data obeysnormal distribution or log-normal distribution, lower limitation of anomaly shall bethe average plus (1.5~3) times of the sample variance, anomaly thus fixed. Thismethod, separating and evaluating anomalies by calculating statistical parameters ofthe data, excludes lots of anomalies out due to the adoption of uniform limit anomalyto fix anomalies, and is not conducive to rapid anomaly separation and verification.Contrast filtering method regards the geochemical background as a continuousup-and down curved surface, regarding the ratio of a sample (xi) to the mean of acertain radius as contrast to fix anomaly. Each sample (xi) has its own geochemistrybackground value and abnormal limit, which can effectively identify the geochemicalanomalies under different background.Fractal geometry is a branch of nonlinear science developed in recently. Itstudies irregular and highly segmented natural phenomenon by means of fractaldimension, self-similarity and power function. The spatial distribution and timeevolution of elements contents in geochemical field are of fractal structural. Fractalmethod does not only take the content distribution frequency of element intoconsideration, but also the abnormal spatial variability, thus can effectivelydecompose complex background and superimpose geochemical anomalies.

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CLC: > Astronomy,Earth Sciences > Geology > Geology, mineral prospecting and exploration > Geochemical exploration
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