塔里木盆地北部星火3井前中生界岩浆岩年代学特征及地质意义

Geochronology of Pre-Mesozoic Magmatic Rocks from XH3 Well in Northern Tarim Basin and its Geological Implications

摘要: 笔者对塔里木盆地北部库车坳陷南缘斜坡的星火3井钻遇的一套岩浆岩进行岩石学分析及年代学研究。星火3井区岩浆岩主要由酸性、基性喷出岩组成，星火3井主要钻揭霏细岩。对星火3井的1个岩心样品进行LA-ICP-MS锆石U-Pb年龄测定，获得霏细岩年龄为（294±10）Ma，代表该区二叠纪岩浆喷发的最晚年龄。表明库车坳陷南缘与塔北其他地区一样，发育二叠系岩浆岩。

Abstract: In this paper, a set of magmatic rocks drilled from XH3 well in the southern margin of Kuche depression have been studied on lithology and chronology. These magmatic rocks are mainly composed of acidic and basic extrusive rocks, and a set of felsite have beendrilled from XH3 well. A core sample of XH3 well has been studied on U-Pb zircon geochronology by LA-ICP-MS. The zircon U-Pb dates are (294±10)Ma, which stands for the latest age of Permian magmatic eruption.This dating data suggests that the Permian magmatic rocks extensively developed in the southern part of the Kuche depression, corresponding to the other parts of northern Tarim basin.