摘要:
区域化探元素致矿序列是通过数理统计的手段,对区域化探样品各元素测试数据的变化系数、样本数、偏度、浓集系数及最低浓集系数等参数进行统计,并以公式定量化的形式得出致矿系数,从而厘定区域化探致矿序列。通过致矿序列的确定,发现在祁漫塔格东段,W、Au、Bi、Sn、Pb、F、Ag、Cd等为该区的主要成矿元素(指示元素);长城系小庙岩组及印支期侵入岩为W、Sn等的主要找矿靶区;印支期侵入岩与蓟县系、白沙河组、石炭-二叠系等含碳酸盐岩地层的接触部位为Cu、Pb、Zn、Fe等多金属矿产的主要成矿区;Au的主要成矿区则分布在该区中西部的祁漫塔格群地层中,成矿类型应为与白干湖断裂及其次级断裂有关的破碎蚀变岩型。根据区内成矿地质条件及化探组合异常特征,对主要成矿元素的找矿靶区进行了划分。
Abstract:
Themineralizationsequenceofregionalgeochemicalelementsliesinthestatisticanalysisofsuchparametersofelementana-lyticaldatafromregionalgeochemicalsamplesasvariationcoefficients,samplenumber,deviations,concentrationcoefficientsandmin-imumconcentrationcoefficientsbymeansofmathematicalstatisticstoobtainthemineralizationcoefficientsintheformofformulaquan-tification,thusdeterminingregionalgeochemicalmineralizationsequence.Basedonthedeterminationofthemineralizationsequence, theauthorhasfoundthatW,Au,Bi,Sn,Pb,F,AgandCdconstitutethemajorore-formingelements(indicatorelements)inthe easternsegmentofQimantagarea,thattheXiaomiaorockformationofChangchengSystemandtheIndosinianintrusiverocksaremajor ore-prospectingtargetareas,thatthecontactzonesbetweentheIndosinianintrusiverocksandcarbonaterock-bearingstrataofJixian System,BaishaheFormation,andCarboniferous-Permianrocksaremajorore-formingdistrictsofCu,Pb,Zn,Fepolymetallicorere-sources,thatAumetallogenicareasaremainlydistributedinstrataofQimantagGroupincentralandwesternpartsofthestudyarea, andthatthemineralizationshouldbelongtotheshatteredalterationrocktyperelatedtoBaiganhufaultanditssecondaryfaults.Based onregionalore-forminggeologicalconditionsandgeochemicalcompositeanomalies,theauthorsindicatetheore-prospectingtargetar-easofthemajorore-formingelements.
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