The Study Of Akebasitao Granite Body In Xizhungaer, Xinjinag

This dissertation is object on the Akebasitao granite rock of Lower carboniferous in Zhayier mountain area in Xizhungaer, have systemic research to this granite body by field character, petrology, the type of rock association ,lithogeochemistry , tectonic environment and connection with ore-forming et al,the abstract of the dissertation as follows:1.According to the view of comagmatic evolve series,and the character of petrology,petrochemistry,geochemistry et al, Akebasitao granite rock can be plot one series, it be made up of granodiorite,syenogranite and adamellite from early to late , it′s age is Lower carboniferous.2.The contact connection of Akebasitao series and surrounding rock is intrusive contact, the contact connection of every type rock is pulsation.3.We have collected a age sample of Zircon U-Pb in adamellite which located in center of Akebasitao series at this work, it′s age is 296Ma , Akebasitao series age is Lower carboniferous from analyse prevenient date and this date .4.SiO2 is 74.51%～78.39% of Akebasitao series , and Al2O3 is 11.8～13.33% , Na2O+ K2O is 7.87～8.53% , Akebasitao series is alkaline rock。So the character of Akebasitao series is high Si , high alkali and lower Al , the rocks have not alkali dark mineral , majority feldspar mineral are alkali feldspar , majority dark mineral are hornblende and biotite , Akebasitao series have character of A-type granite.5.Akebasitao series enrich big ion lithophile , for example , K2O,Rb,Th et al. Y/Nb is 5.40-8.66,all of them are higher than 1.2 , the Eu of REE element is strongly lack ,δEu is 0.038~0.130 , all of them are about 0.1 , the diagram of REE distriibution patterns is clear"V"type , all of these character as same as typical A-type granite of Al type.6. Akebasitao series be formed at post- orogeny tectonic environment with force of compression.It is a symbol that the orogeny was finish, The stress began translate into tensile.7.Alkali granite magma of Akebasitao series be formed partial melting of original rocks which be effected by upper mantle matter(basaltic magma);the magma which be formed of partial melting be extracted from original source by compaction and migrate to reservoir which be provided by Daerbute deep fracture;the main combination was slice convection combination of crust and mantle at process of magma formed, plagioclase was the main fractional mineral at magmate process ,so the Eu of the alkali granite is clear negativeanomaly ;there are 3 time main differentiation after magma be formed, so produced granodiorite,syenogranite and adamellite from early to late.8.The background value of Sn,Pb et al elements of Akebasitao series is higher than surrounding rocks and average value of crust,the diagram of relationship between the petrochemical of granites and the types of mineralization shows that the Akebasitao series has relationship with Sn mineralization,so we should search for Sn,Pb minerals at native area in the future.