The Heishantou Formation volcanic rocks occurred in the area of Barleik, West Junggar, consisting of gray purple (vesicular) almond andesite and almond shaped basaltic andesite, belonging to sub-alkaline series. High-precision LA-ICP-MS zircon U-Pb dating has revealed that they were formed at the age of 349±8Ma, MSWD=0.14 (95% conf.), the time belongs to the Early Carboniferous. These rocks have moderate Mg# (23.82~50.4) values, relatively high alkali (Na2O+K2O=3.74%~8.02%), and relative enrichment in sodium. Their LREE are relatively enriched ((La/Yb)N=2.87~13.41) and well fractionated ((La/Sm)N=1.46~3.41)), while HREE fractionation is weak ((Gd/Yb)N=1.46~3.48)). Only some of the samples have weak negative Eu anomalies (δEu=0.82~1.47). All samples are characterized by large ion lithophile elements (LILEs, eg., Ba, Th, K and Sr) enrichment, especially Ba and K, high field-strength elements (HFSEs, eg., Nb, Ta, and Ti) depletion, while Zr, Hf slightly enriched. Geochemical features indicate that the volcanic rocks are products of metasomatism between subduction-zone fluids and lithospheric mantle. Comprehensive analysis indicates that the volcanic rocks were derived from active continental margin. The determination of the age and tectonic environment information of volcanic rocks from Heishantou Formation provides new evidence for further understanding of the tectonic evolution in the area of Barleik in the West Junggar.