Fifteen samples from three study areas (the Bancun diabase dykes, the Bali hornblendegabbro dykes, the Linzifen gabbro-diabase dykes) were collected and analyzed for selenium (Se),sulfur (S), copper (Cn), major and trace elements. In general, Se, S and Cu do positively correlate toeach other. The concentration of S and Se and the S/Se ratio are higher than the corresponding valueof primitive mantle (PM), and the Cu/S ratio falls in a narrow range (0.04-0.29), which is consistentwith that of primitive mantle (0.05-0.20). The Bancun diabase dykes and the Bali hornblende gabbrodykes were located in an intraplate environment during the Late Mesozoic. Oceanic subduction wasclosely related to magmatic activities. The magmatic activities play an important role in thetransportation mechanism of Se and S. Because those two groups were closer to fault zones, whichmay affect the distribution of S and Se and other elements. In the two groups, no crustalcontamination was observed, indicating that all analyzed elements may come from enriched mantlemetasomtism associated with slab subduction. However, the Linzifen gabbro-diabase dykes werelocated in an intraplate rift environment, and its invading age is older than the other two groups, theprimitive magma comes from mantle, and there is an anomalous relation between S, Se and A!203,(La/Sm)N, and all these factors could result in higher S and Se concentration.