In baisn peripheral areas, J3 mildacid and high-K volcanic rocks distribute in the west of Tanlu fault, calc-alkaline series in Chuzhou, Fanchang and Ningwu and alkaline series in Huaining and Lucong.

• 中生代在合肥、信阳盆地内有分布，合肥盆地发育晚侏罗火山岩，为中性、高钾、钙碱性系列火山岩；