Study On Quantitative Modeling Of Trace Elements In Magmatic Processes And Its Application

The trace elements quantitative model of magmatism is a mathematical model whichsimulates the allocation quantity of trace elements among different phases in themagmatism process. These models are of great significance for the quantitativereaserch of the magmatic origin, formation and assimilation, and the petrogenesis.These models have not been widely used in the rock and ore formation mechanism yet,because the calculation process is complex and amount of calculation is large. JilinHongqiling intrusions contains the second largest Cu-Ni sulfide deposits in China.Former researchers have carried out a lot of work about mine and rock formingmechanisms, but these researches are still in the stage of qualitative inference. And sofar quantitative modeling research havn’t been reported.In this thesis, the existing quantitative models of trace elements are summarizedin detail. The anthor carry out the computer simulation methods research about traceelements quantitative model of melting, crystallization and magma contaminationduring magma formation, evolution and diagenetic process. Selected non-solid ratiomolten models, simple crystallization model and fractional crystallization models ofopen system et al, developed the magmatism trace elements quantitative simulationprogram based on Matlab. This program achieves a series of functions aboutquantitative model of trace elements selected, parameter setting, sample input,graphics generation and data visualization.Utilizing the quantitative modeling program, carry out the quantitative modelingresearch for the magma formation and evolution of the typical metallogenic intrusionsof Hongqiling deposit (No.1,7mafic-ultramafic intrusions). The results show that,Hongqiling No.1intrusion formed by20%partial melting of depleted mantle source with5%of the surrounding rock (Hulan group) contamination, which could beoccurred along their ascending conduit or during the magma emplacement. No.7intrusion formed by10%partial melting of depleted mantle source with13%of thesurrounding rock (Hulan group) contamination and crystal fractionation in a deepmagma chamber, respectively, formed the main rock body (ore-bearing websterite)and the rich ore-bearing vein peridotite.