Research On The Method Of Establishing The Spatial Location Model Of Typical Porphyrite Iron Ore In Zhong Gun Ore Field

Three-dimensional metallogenic prognosis is an exploration method that is continuously developing at home and abroad and show huge vitality in assessment of deep and latent ore block.Based on the traditional porphyrite-type iron deposit ore prospecting model,this paper choose Zhonggu ore field as research district where has high degree of research in middle and lower yangtze river.In the basement of comprehensive geological material and building three dimensional geological model,a number of three dimensional spatial analysis methods such as three-dimensional distance field,uplift and depression degree,stratum combined entropy,fault density,are employed three-dimensional analysis about geological factor of Baixiangshan,Gushan,Yangzhuan,Zhongjiu which are classical porphyrite-type iron deposits.After analysis,many quantitative numerical values were got which can characterizate spatial relationship between geological body and ore body.By statistics,filter and comprehensive analysis,we could gain the quantitative numerical value assemblage which can represent the spatial feature of geological factor and build a three-dimensional space positioning model about porphyritic iron deposit in Zhonggu ore field.By use of space positioning model,superposing constraint of numerical condition,a prognosis work of similar mineral deposits has been done in the research district.Contrasting the prognosis result with target region given by former prognosis work could verify the validity of space positioning model.The space positioning model of Zhong gu ore deposit in this paper reflects the features and regularity of porphyritic iron deposit,so the model and process to build it can be employed in other districts and ore deposits.The work of this paper is an exploratory work to quantifying ore-finding model which could improve the research degree of porphyrite-type iron deposits from new profile and enrich the research methods about quantifying metallogenic prognosis.The primary conclusions gained in this paper as flow:(1)Three-dimensional space analysis is an effective method for researching geological phenomenon,it can synthesize the multisource multidimensional heterogeneous data and effectively excavate the hidden regularity and indirect data within the big data of geology.(2)The analysis result of altitude difference at ore Z direction can reflect the distance features of geology factors in vertical direction;analyzing uplift and depression degree and the shape can reflect that form feature of intrusive rock top surface;analyzing the stratum combined entropy can reflect the degree of transformation caused by tectonic movements;the fault structure analysis can reflect the influence degree of fault.(3)By means of data mining,we have gained some conclusions that most of the ore bodies of Baixiangshan,Gushan and Zhongjiu iron deposits located in the intrusive rock top surface and Baixiangshan,Gushan and Zhongjiu iron deposits regional have a more intense tectonic than Yangzhuang iron deposit,so,Yangzhuang iron deposit has a less influence caused by fault.These conclusions are consistent with the results gained by traditional geological work.(4)The quantitative numerical values gained by three-dimensional spacial analyzing can reflect some features,such as spatial distribution,shape and relationship with mineralizing,of geological body of porphyrite-type iron deposit.It is an ore-finding model ore embodied by data as well as foundation work for space positioning model.(5)The three-dimensional space positioning model of which indicators of quantitative prediction is more precise,reasonable and valid is more scientific compared to the value estimated on a large scale by geological experience before and can directly apply to three-dimensional metallogenic prediction.