Pattern Of Ore-controlling Structures In Different Deposit Types In Luanchuan Ore Belt

Luanchuan ore belt is located in East Qinling Orgen.There are many deposits like Nannihu deposit and Shangfang which have big reserves in the belt.Deposits in different types is always a focal point of disputes between the scholars in studying the theory of mineralization and the theory of deposit prediction.But, types of ore-controlling structures in different deposits in Luanchuan ore belt has never been studied carefully.This paper is based on the summary of former studies and includes a new investigation of mines and test cores in deposits.According to the deposits’ geologic features,this article makes analysis of ore-controlling structures in each deposit and combing the different mineralization characteristics in the ore-controlling structures. In this paper, the main achievements are as follows:(1)The typical ore deposit in Luanchuan ore belt can be divided into porphyry-skarn type molybdenum-tungsten(iron) polymetallic deposit, hydrothermal type lead-zinc-silver deposit, skarn type sulfide polymetallic deposit.(2)The main ore-controlling structure pattern in Luanchuan ore belt can be summarized as follows: ore-controlling structure pattern of the contact zone, ore-controlling structure pattern of fold, ore-controlling structure pattern of fault which through strata ore-controlling structure pattern, ore-controlling structure pattern of bed-parallel fracture.(3)Contact zone controls the mineralization of Nannihu-Sandaozhuang deposit,Shangfang,East Yuku deposit.Mineralization of Luotuoshan deposit is main controlled by the folds. Faults which through strata play an inpotant role in the mineralization of Lengshuibeigou deposit. Bed-parallel fractures control the mineralization of Xigou deposit,Yindonggou deposit,Bailugou deposit.(4)An ore-controlling structure pattern includes different types of mineralization.In Nannihu and Shangfang, mineralization tends to locate in the veinlets or vein net.In Sandaozhuang, mineralization tends to form disseminated structure.In East Yuku,mineralization can be all the station mentioned above.In Pb-Zn deposite, ore-controlling structures under different stress have different ore textures and structures(5)In Luanchuan ore belt,the folds combination which named “two Anticlines clamping one Syncline”control the locations of all the ore-controlling structure patterns.