The volcanic rocks of different ages have similar petrochemical characteristics and exhibit the high-Ti, -Al and -Na and low-K characters, belonging to the tholeiite series.

• 不同时代的火山岩具相似的岩石化学特徵，表现为富钛、富铝、富钠、低钾的特点，属拉斑玄武岩系列。