塔里木盆地中部塔参1井花岗闪长岩的锆石SHRIMP U-Pb年龄

Zircon SHRIMP U- Pb age of granodiorite of the Tacan 1 well in the central Tarim basin, China. Geological Bulletin of China

摘要: 前人对塔里木盆地中部前寒武纪地层的时代存在不同认识。为获得确切的同位素年龄数据，对塔中隆起塔参1井前寒武纪基底花岗闪长岩进行了锆石SHRIMP U-Pb年龄测定，结果为757.4Ma±6.2Ma，从而证实其为南华纪中期岩浆活动的产物。该成果为进一步研究塔里木盆地前寒武纪基底提供了新的实际资料。

Abstract: There are many discrepancies about the age of pre-Cambrian strata in the central Tarim basin. In order to get the correct isotopic age，SHRIMP U- Pb zircon dating of pre-Cambriam basement granodiorite from Tacan 1 well in the central uplift zone of the Tarim basin was carried out， yielding an age of 757.4±6.2 Ma. This could be the evidence that it is the result of the magmatic activity during middle Nanhuan Epoch. These results provide practical information for further detailed and systematic study of the preCambrian basement of Tarim basin.