Experimental Simulation On Migration Of Hydrothermal Ore-Forming Elements In Granite

Utilizing the geochemical anomaly of primary halos to research and study the deposit is one of the main methods of chemical exploration.But in the primary halos,main standard of indicating deposits is the zonation and zoning sequence of the primary halos.The primary halos' forming process can form element distribution,because that the migration,sediment,enrichment abilities of each element is different as the ore-forming hydrothermal in the process of the flow of the surrounding rock.Under the influence of own physical and chemical properties and external conditions,the distribution of the element reveals that the same minerals will have the similar zonation.so the study of hydrothermal elements' migration and distribution rules in rocks is significant to the study of the primary halos.The experiment use independently developed water-rock flow reaction system,takes the granite of Ling Long,Shandong Province as research object,and imitates the process of elements' migration of the ore-forming hydrothermal in granite.The experiment is about configurating the simulated solution whose concentration is higher than the protolith's abundance in different multiples,than letting the simulated solution reaction with granite core,under the temperature of 100?,flowing pressure of 15MPa.Before and after the two phases of different batches,the reaction time are 13h and 8h.After the experiment,the granite core is scanned by X-fluorescence spectra after core cutting.We will get the data of each element in the core axis surface density distribution,than we will manage and analyze the data for discussing the migration and distribution pattern of the elements in the granite core.We obtained the following conclusions by comparing the trend of the distribution of elements in the experiments:(1)Under the experimental conditions,If the concentration of elements in simulated solution concentration is low,The reaction precipitation amount is less,tests are greatly influenced by background,to embody the migration patterns;(2)The experiments had little effect on major elements of the rock samples;(3)After the reaction,the distribution of trace elements in the core is essentially higher content in the inlet section and lower to the end of the core,showing a downward trend;(4)All trace elements have different migration,distribution in the core.After comparison,we found the migration ability of the element in simulated solution in this experimental conditions is:Cu<Pb<Zn<Cd,(5)In the experiments,other the experimental trace elements data quality is poor,but after a simple process we found that the data of Ag,As,Bi distributed more in the latter part of the core.this test method may not be suitable for these a few elements,can be in other elements analysis method.