Studies On The Geochemical Characteristics Of Ore Genesis Of The Cang Yi Iron Ore Deposit,Shandong Province

Cang Yi Iron ore deposit in the structure of the earth is located in the middle of Mountain ni bulge and linyi bulge of Shandong uplift,which is the most important iron ore deposit in the west of shandong province.Through the geological work of recent years,Cangyi iron ore deposit has make a great improvement in the research of mineralization.On the basis of collected geological data and Geological survey,I make use of the characteristics of Ore deposit geology and geochemical to discuss iron ore material source,metallogenic tectonic environment and metallogenic mechanism.The main results and understanding are as follows:1 Iron ore occurrence in magnetite quartzite,which structure is Since the form structure and half since the form structure.The banded structure is formed by Fe and Si.The surrounding rock is biotite granulite and amphibolite plagioclase.2 The average content of magnetite quartzite is 33.45%.The main elements is composed of SiO2(46.94%)?Fe2O3(18.64 %)?FeO(23.57%).The average content of magnetite quartzite is 33.45%.The main elements is composed of SiO2 enrich large ion lithophile elements,such as Th?Ba?Rb?K,Loss of high field strength elements,such as Ti?Zr?Nb.After PAAS standardized processing,Cangyi 's rare earth elements content is generally low,which is shown as: relatively light rare earth elements,heavy rare earth elements relative loss.Eu range is: 1.35-1.67.with a mean of 1.52,belong to the Eu enrichment type,scope of the delta Ce: 0.84-1.01,with a mean of 0.94,no Ce anomaly.3 Cangyi 's BIF formation is related to the activities of Seafloor hydrothermal.But according to Eu anomaly value judgment,the distances from the center of the volcano is far.At time of the water movement stability and lack-oxidation environment,Fe and Si goes to successive deposition.In this period,there islessly terrigenous clastic addition.4 According to the biotite leptynite and amphibolite plagioclase figure shows,Cangyi 's BIF formation is in the continental marginal ocean basin.the series of Shan cao yu's original rock of biotite leptynite is sandstone and mudstone,which means the area in the period of actively tectonic movement.5 The eruption of Basic volcanic rocks on the ocean floor provides rich of the ore-forming material.through the Water transport of precipitation,the iron gain Preliminary enrichment.The pressure and emperature in the medium voltage of Regional metamorphism,The original rock occur recrystallization.the iron gain the further enrichment.sedimentary metamorphic iron ore deposit form magnetite,quartz,hornblende as the mainly composition.