The Geochemical Features And Tectonic Setting Of The Xinjiang Akebasitao Pluton

This paper is about the Akebasitao pluton.There are some research m ethods we decided to use.For example collecting samples with the Akeba sitao pluton outdoors,testing and anaysising major elements and microele ment,doing LA-ICP-MS U-Pb geochemistry dating,anaysising the pluton's petrologic feature and the pluton's tectonic setting are used to do some research about the pluton.Based on the analysis of zircon LA-ICP-MS U-Pb isotopic analysis in the granodiorite in the Akebas group,the age of the rock is 309.2±3.7 Ma,which indicates that the rock was born in the early Carbonifer ous.The granite porphyry of the Akebasi rock mass in the western regio n of Xinjiang has high siliceous content in the analysis of the main ele ments of geochemistry,and the aluminum content is relatively low,weak ly aluminum and alkaline.The high field strength elements such as Zr,Th,Hf and so on in granite porphyry are also relatively enriched,and Ba,Sr,Nb and Ti are seriously damaged.The trace and rare earth elem ents of the rocks are very similar to the trace and rare earth elements o f the aluminum A-type granites present in the coastal areas of Fujian.F or the typical aluminum A-type granite.The granodiorite in the rock ma ss belongs to the granite that is aluminous and alkaline,and falls in the I-type granite in the Na₂O-K₂O diagram.The trace element geochemical characteristics of granodiorite are similar to those of granite porphyry,but Ce,Ba,Sr and other elements are enriched with granite porphyry.B ut also significant loss of high strength field elements Nb,Ta,P,Ti,an d some heavy rare earth elements.The m odel of rare earth elements is right,as a typical I-type granite.Through the structural plots of the gra nite porphyry in the Akebas basin,it can be concluded that after the or ogenic period,it is the A-type granite,ie,the A2-type granite.Granite porphyry produced in 290-310Ma,may be formed by the granodiorite thr ough a series of separation and crystallization.Based on the structural pl ots of granodiorite in the Akebas group,it can be concluded that it is t ype I granite,which is produced at the edge of the active continental m argin.According to its geochemical characteristics and the structural caus es of I-type granites proposed.It is concluded that the granodiorite gran odiorite is formed by the interaction of the mantle wedge following the heat flow and the mantle wedge,causing the young crust to melt.