| The research area is located in the typical Cangyi iron ore metallogenic belt of Shandong Province,which is from Zhuoshan in Zaozhuang City in the west to Songlou area in Lanling County in the east.The total length is about 33 km.The ore bodies are layered and layer-like and occur in Shancaoyu Formation of Taishan Rock Group.Its distribution is controlled by the basement fold structure.There are 39 proven ore deposits in the zone,including 3 large-scale and 19 medium-sized deposits,with a total of 1.566 billion tons of iron ore reserves.It shows that there are superior metallogenic geological conditions and good prospecting prospects in this metallogenic belt.This paper makes full use of comprehensive research methods such as data collection,key sample testing,typical deposit anatomy,analysis of ore-controllingfactors,summary of ore-forming rules,induction of ore-forming patterns,and resource prospect prediction.It was implemented step by step according to the research technology route and achieved good research results:(1)The geology,structure,magmatic rock characteristics,and typical deposit geological characteristics of the Cangyi Iron Ore Belt were systematically combed.The relationship between regional aeromagnetic anomalies and iron deposits was systematically analyzed,the origin of iron ore and the ore prospecting model were discussed.The ore-controlling factors and metallogenic regularity of Cangyi iron ore belt were basically identified and the main ore-finding signs of the metallogenic belt have been determined.(2)It is considered that the ore-bearing rock series of Cangyi Iron Mine is a two-layer combination,and the two ore-bearing rock series have characteristic of rhythmic unidirectional sequence changing in the composition,which is specifically represented by the combination of amphibolite-iron ore layer-biotite granulite.Strong basement folds are the main reason for the incompleteness and irregularity of ore bodies and ore belts,and the reconstruction of basement fold structures by late faults is an important reason for irregular exposure of ore layers and ore belts.(3)It is inferred that the ore-bearing rock series has a depth of more than 2000 m,and it is proposed that high-precision aeromagnetic data can be used to locate magnetite ore-bearing rock series and iron deposits.The quantitative indicators are: ?T maximum of residual>700nT,total gradient modulus ASM> 600nT/m in near-surface ore-bearing section,?T maximum value> 300 nT and total gradient modulus ASM> 100nT/m in hidden mine section.(4)Eight metallogenic prospects were demarcated,of which three were Class A,three were Class B,and two were Class C.The amount of iron ore resources in the A-level metallogenic prospect is estimated to be 438 million tons,which provide a prospecting direction for future iron ore exploration. |
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