Research On The Changing Rule Of Elements During Weathering Of Biotite-granite Profile In Jiaojia Gold Deposit,Shangdong

Hypergenic geologic process is the most complex and active geologic mechanism on the earth's crust and wreathing is the most common one of the Hypergenic geologic process.From the point of view of mineral exploration learn by weathering lead to the decomposition of ore bodies,crushing,migration,and the large-scale migration,caused by element but also for exploration geochemistry soil survey provides theory basis.We research the change of element migration rule,from the pedestal rock to soil by weathering,it is helpful to improve method of geochemical exploration.In this paper,we selects weathering profile on the biotite-granite that is about 7.5 m in shandong jiaojia goldfield as the research object,designed to reveal change rule of major oxides,rare earth elements,high field-strenth elements,Hydrothermal ore-forming elements,large ion lithophile elements and others by weathering,from the bottom of pedestal rock to the top of soil and in different level grain of soil.In This paper,we will be divided the soil samples(JJ11Z01B1?JJ11Z01B2)that is upper of the wreathing crust into five grain grade,and according to changes of the relation between 5 different grain and the change of the content of element,establish the 6 types of 10 small relationship model.Using this model discuss change rule of the content of major oxides elements,and rare earth elements,high field elements,hydrothermal ore-forming elements,big ion lithophile element and other elements in different level of grain and through statistical analysis we can draw when we carry out the soil geochemical survey,the sampling the optimization of grain of level is 60?100 mesh in the area.Through the research the relationship between the depth and content of element,combined with mass balance principle select Zr,Hf for inmobil elements quantitative analysis Migration changing rule of element on the diffent layer of weathering profile.We think that weathering of biotite-granite is a process that is basically totake off the silicon rich iron and aluminum process in jiaojia gold depoist area.With the deepening of weathering,rare earth element enrichment gradually,the enrichment's degree of HREE is more apparent than LREE;s.the Eu anomalies is very apperent.But,as the grain grade of soil become more and more fine,the Eu anomalies disper graudlly.The high field-strenth elements change ruel is simile except Ta,U.The ore-forming element are mobile,especially Au,W,As gained greatly.