Abstract: Santanghu oil-gas province is located in Xinjiang,northwest China,where developed huge area and various systems of igneous rock formations. The lithology is mostly volcanic explosion rocks and locally hypabyssal intrusive rocks. Based on the geochemical analyses of 20 samples available from this area, it is shown that the characters of rare-earth elements in igneous rocks are very similar to those of Permian volcanic rocks in Turpan-Hami basin, in which the total amount of rare-earth element is significantly variable with relatively enriched light rare-earth elements and indistinctive abnormal element of Eu. The integrated research with K-Ar approach suggests that the igneous rocks in the basin are developed in an episode ranging from 270.0 to 290.8Ma, corresponding to Late Carboniferous to Early Permian.

Key words: Santanghu basin, igneous rock, chemical element, geochemistry characteristics, isotope geologic age, determination