新疆尼勒克南部地区花岗斑岩锆石U-Pb年龄

Zircon U-Pb ages of granite porphyry in the South Nileike,Xinjiang

对巴斯陶萨依、莫斯早特套花岗斑岩地质、地球化学特点,锆石的特征进行了详细的研究和单颗粒锆石U-Pb同位素年龄测定。获得巴斯陶萨依岩浆结晶锆石U-Pb同位素年龄为241.3±3.6 Ma,以及继承性锆石U-Pb同位素年龄为292.3±5.6 Ma。综合各方面因素认为这两个岩体侵位时代为早三叠世(印支早期)。

A detailed study of the geological and geochemical characteristics of the granite porphyry and zircon features were made and the single grain zircon U-Pb ages were determined at Basitaosayi and Mosizaotetao in Xinjiang. The results show an isotopic age of 241.3±3.6 Ma of magma crystallized zircons and a surface age of 292.3 ± 5.6Ma of inherited zircon at the Basitaosayi. On the basis of the data the emplacement time of the two rock bodies is regarded as early Triassic（early Indosinian）.