Research On Geochemical Characteristics Of Quartz Diorite In Alatuntage Area,Yuli City,Xinjiang

The Aletuntagearea is located in the western section of the Kuluketage metallogenic belt in Xinjiang.Previous studies have been made on the eastern section of the metallogenic belt,but the study on the western section is relatively weak,lacking of magmatic structural metallogenesis The systematic analysis of the effect constrains the understanding of the tectonic evolution and metallogenic regularity of the whole Kuluketage metallogenic belt.In this paper,we will focus on the systematic petrological and geochemical studies of the Aletuntage area in the western Kuluketage area.On the basis of field geological survey,the quartz diorite of the area was identified by microscope and main trace elements.The magmatic source area,petrogenesis and tectonic evolution of the quartz diorite in Aletuntage area were discussed.This paper discusses the source of the magmatic action and the tectonic environment in this area.This project relies on the comprehensive survey data of field survey,geophysical prospecting,geophysical exploration,remote sensing and so on,which is based on the project of "Geological Survey of Aletuntage No.2 Gold Field in Yuli County of Xinjiang".The quartz diorite geochemistry,rock geochemistry and so on.On this basis,the research on magmatic source area,petrogenesis,tectonic setting and diagenetic tectonic dynamics of the study area was carried out.The main achievement of this paper is as follows:The main elemental analysis of the rocks shows that the SiO2 content of the quartz diorite is about 63.81 ~ 66.08%,the Al2O3 content is 16.86 ~ 17.90%,the Na2 O content is 3.93 ~ 4.42%,the K2 O content is 2.1 ~ 2.87%,the CaO content 4.01~ 5.28%,MgO content 1.61 ~ 2.13%,TiO2 content 0.20 ~ 0.28%,the overall characteristics of high Al,rich Na-rich K,rich Ca,high Mg low Ti,is quasi-aluminum rock calc-alkaline series.Trace element studies show that the quartz diorite in the Aletuntage area is depleted of high field-strength elements Th,Nb,Zr,Hf,Ti and some REE elements,enriching large ion lithophile elements K,Rb,Ba Sr,showing the volcanic arc granite magma characteristics.The magmatic source is partially melted by the metasomatic mantle wedge of the subduction plate,and is not mixed with the crust material during the uplift and emplacement.Rare earth element geochemical characteristics show that the whole rare earth content of quartz diorite in Aletuntage area is low,the total amount of rare earth is25.07 × 10-6 ~ 35.26 × 10-6;the fractionation of light and heavy rare earth elements is obvious,HREE is 10.39 ~ 11.80,rare earth parameter(La / Yb)N is 12.11 ~ 14.70,and ?Eu is 1.07 ~ 1.28,showing weak positive anomaly;?Ce is 0.85 ~ 0.92,showing weak negative anomaly.Comprehensive analysis of the tectonic environment in this area shows that the quartz diorite in the Aletuntage is formed in the active continental margin of the southern Tianshan plate.