青海兴海鄂拉山一瓦洪山火山盆地的火山活动特点及地层划分,长期来一直存在争议,归纳起来大致有三种认识:①这套火山岩绝大部分为陆相喷发的侏罗系,少部分的海相喷发分属Pt、T_1和T_2;②这套火山岩及其基底统属上三叠统,并可细分为三个岩组;③虎达安山岩为上三叠统,其余为中三叠统海相火山岩(表1)。笔者近几年一直在该区从事野外地质工作,在 The characteristics and stratigraphic division of the volcanic activity of a Wahongshan volcanic basin in Hailaxinghai’ela Mountain have been controversial for a long time. There are generally three kinds of understanding: ① Most of this volcanic rock is a continental jurassic eruption, and a small part The marine eruptions belong to Pt, T_1 and T_2. ② This volcanic rock and its basement belong to the Upper Triassic and can be subdivided into three rock groups. ③ Hu Da An Shan Yan is Upper Triassic and the rest is Middle Triassic Marine volcanic rocks (Table 1). In recent years, I have been engaged in field geology work in this area