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

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.