河南老代仗沟铅锌矿床原生晕异常的赋存规律及找矿意义

老代仗沟矿床为伏牛山岩浆期后热液充填成因的脉状铅锌矿的代表性矿床。基于1∶20万和1∶5万水系沉积物地球化学综合异常,开展了1∶1万土壤地球化学测量和1∶5千岩石化探测量。土壤化探次生晕异常(Pb、Zn、Ag成矿元素)的分布面积大、强度高,且与矿带展布方向高度一致;岩石地球化学原生晕异常反映了矿带及矿体的浅、深部的铅锌工业矿体主元素的分布规律,其中Pb、Zn套叠好,Ag、Cu套叠差。矿带由内向外横向分带规律为:Pb-Zn-Ag-Cu→Mn-Sn→(Mo)-Co-Ni;轴向分带自上而下(高程750~450m,间隔60m)为:As-Ag→Sn→Zn-Pb→Be→MoCo-Ni→Cu-Mn;找矿指示元素:矿上为Be、Mn;矿中为Pb、Zn、Ag、(Cu);矿下为Co、Ni。该项研究成果可作为矿带、矿体深部勘查预测的依据。

Occurrence pattern and prospecting significance of primary halos in Laodaizhanggou lead and zinc deposit

Laodaizhanggou is the representative post magma hydrothermal filling vein type Pn,Zn deposits in Funiu Mountain area,Based on the integrated geochemical anomlies of stream-sediment survey at scale 1 ∶ 200 000 and 1 ∶ 50 000 soil geochemical survey at scale 1 ∶ 1 0000 and rock geochemical survey at scale 1 ∶ 5 000 have been completed.Secondary soil geochemical anomlies of ore elements (Pb,Zn,Ag) are lineated in large area and high intensity and they are coincided with the known ore zones.The primary geochemical halos of rock fully reflects distribution pattern of the main ore elements of industrial ore bodies at shallow part and to the depth in the ore zones.Pb、Zn are well fit and Ag、Cu less fit.Horizontally,from center to margin the of the ore zone the ore elements are distributed in the pattern Pb-Zn-AgCu → Mn-Sn → (Mo)-Co-Ni;Axial zoning from top to bottom (elevation 750 m-450 m,60 m interval),As-Ag→Sn→Zn-Pb→Be→Mo-Co-Ni→Cu-Mn.Be,Mn are the prospecting indicator elements at top of the ore body,Pb,Zn,Ag (Cu),the indicator middle of the ore body and Co,Ni bottom of the ore body.The mentioned above results could be used as the inference for prospecting prediction in ore zone and to depth of ore bodies.