Perrogenesis And Its Goodynamic Signficance Of Neproterozoic Granite In Kuruktag, Xinjiang

This papers will discuss the petrogenesis of HLG、XD4、TYD、XD1、NTKB、XD2 pluton ore-forming material、source and structural setting, which locate in kuruktag domain.Field observa-tion、petrographical description and geochemical analysis on the whole rcks were used。The Hongliugou、xingdi4and Nitankuangbei plutons are characteristied by low SiO2 (average content:67.82%,64.01%、69.12%)、high A12O3 (average content:16.03%,16.52%,16.01%),which mean they are precaluminous cal-alkaline granites.The Taiyangdao,Xingdil,Xingdi2 plutons are characte-ristied by high SiO2 (average content:74.17%、73.13%、73.50%),low Al2O3 (average content:13.44%、12.54%、13.07%), which mean they are weaky precaluminous cal-alkaline granites.All the plutons show nagetive anomly of field strength elements such as Ta,Nb,Zr,Hf while lithopile elements such as K、Rb、Ba exhibit positve anomaly。Chondrite-normalised REE distribution patterns display right skewed shapes with slightly negative Eu anomalies of Taiyangdao、Xingdil,Xingdi2 plutons and weakly positive Eu anomalies of HLG,XD4,NTKB plutons,which also show significant fractionation of LREE, as well as fractionation between LREE and HREE.Due to LA-ICP-MS zircon dating method, we know the ages:HLG(830.4±8.2Ma),XD4(816.6±8.3Ma),TYD(798±8.5Ma),XDI (741.0±5.7Ma),NTKB (786±12Ma),XD2(724±15Ma). According to petrogenesis,ore-forming material,source and structural setting and regional geologicai setting,we discuss Neoproterozoic granites’ geodynamics significance,we think they are responses of the Tarim movment,which also mean the consolidation of Crystalline basement of the Tarim craton.