山东招掖金矿带原生金矿化地球化学特征的数学地质研究

本文主要是应用数学地质方法研究山东招掖金矿带原生金矿化地球化学特征,从而确定金矿化的最佳地球化学标志组合,并建立原生金矿化模式及金矿体原生晕的判别模式.

GEOMATHEMATICAL STUDY ON THE GEOCHEMICAL CHARACTERISECS OF THE PRIMARY AU-MINERALIZATION IN THE ZHAO-YE METALLOGENTIC BELT,SHANDONG PROVINCE

Medium-hydrothermal-filling metallogenic model has been established for the Au-deposits located in the Zhao-Ye ore belt.Movement of hydrothermal fluid is controled by fractures.Under guidence of such an idea,principles and methods of classical statistics is applied to make clear of the gold distribution pattern.The results reveal a mixed distrbution population.Through sceening appear three sub-populations corresponding respectively to the three Au-mineralizatjon stages.On the further study of statistical characteristics of the indivedual population associations of geochemical indecator are determined by correlation analysis,factor analysis and fuzzy grouping analysis: 1.Au-Ag-Bi-Te; 2.Au-Ag-Cu-Bi-As-Se; Au-Ag-Cu-Pb-As-Bi-Zn-W; 3.Au-Ag-W.And Au,Ag,Te,Bi,Cu,Pb,As,Se,are the best ore-searching indicators.LnAu = 1.0454 LnAg+0.4223LnTe-0.5353,the element geochemical model of primary Au-mineralization is established by regression analysis.Based on the primary minerahzation characteristics discriminant analysis is applied to the establisment of the model of Y=0.0685 Ln (As·As)-0.018₂ Ln (Au·Te)-0.0203 Ln Cu-0.1046 Ln Mn which can tell the upper helo from the lower helo of ore bodies.