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沿郯庐断裂带及其两侧地区,是我国新生代火山岩广泛出露的地区之一,也是环太平洋带西岸中、新生代火山岩带的重要组成部分。区内新生代火山岩,较集中出露于胶辽断块南段的蓬莱—栖霞一带(称蓬莱火山群)、鲁西河淮块隆北部的临朐—潍坊和沂水—安丘(称昌乐—沂水火山群)以及苏北盆地西部的加山—仪征一带(称加山—六合火山群)。
Along the Tan-Lu fault zone and its both sides, it is one of the areas where the Cenozoic volcanic rocks are widely exposed in China. It is also an important part of the Meso-Cenozoic volcanic belt in the western Pacific Rim of the Pacific Rim. The Cenozoic volcanic rocks in the area are mainly concentrated in the Penglai-Qixia area (known as the Penglai volcano) in the southern section of the Jiaoliao fault block. Linqu-Weifang and Yishui- Yishui volcano) and the western part of Northern Jiangsu Basin - Yizheng area (Jiahan - Liuhe volcano group).