The Neoproterozoic basalts and diabases from Qianyang and Guzhang, western Hunan, are classified as alkaline basahs.Their geochemical features of trace elements are similar to those of OIB.

• 湘西黔阳、古丈新元古代玄武岩-辉绿岩属碱性玄武岩．其微量元素特征近似于OIB，它的规模值得进一步调查。