内蒙古贺根山北乌兰德勒花岗岩体锆石U-Pb测年、地球化学特征及其构造意义

Zircon U-Pb age,geochemical feature and tectonic significance of the granite pluton in northern Hegen Mountain of Inner Mongolia

乌兰德勒岩体为一个由两次岩浆侵入形成的大型复式岩体,主要由黑云母正长花岗岩和黑云母二长花岗岩组成,两种岩石的形成年龄分别为140±2 Ma和161±1 Ma。黑云母正长花岗岩显示高分异花岗岩的地球化学特征,该类岩石与成矿关系密切。黑云母二长花岗岩表现为低Sr高Yb的地球化学特征。地球化学资料显示黑云母二长花岗岩为A型花岗岩,形成时的构造环境为伸展体制。

Wulandele plulon is a large-scale complex massif generated by twice magmatism. The complex massif is made up of biotite-granite and biotite-monzogranite, aged in 140 ±2 Ma and 161 ±1 Ma, respectively. The biotite-granite reflects highly fraetionated characteristics geochemically. While the biotite-monzogranite implies low Sr and high Yb in geochemical characteristics. Geochemical data suggest that the biotite-monzogranite are Atype granites, which tectonic setting was are mainly dominated by the extensional system.