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胶南地区斜长花岗岩与中元古代变辉长岩相伴产出，由６０％的斜长石和４０％的石英组成。化学成分以高硅、低至中等的铝、低Ｋ２Ｏ为特征，与大洋斜长花岗岩相似。其单颗粒锆石ＰｂＰｂ同位素年龄是（１３７０．６±１４．３）Ｍａ。
The plagiogranite in the Jiaonan area is accompanied by the metamorphic gabbro and consists of 60% plagioclase and 40% quartz. The chemical composition is characterized by high silicon, low to medium aluminum and low K2O, similar to the oceanic plagioclase granites. The Pb-Pb isotopic age of single zircon is (1370.6 ± 14.3) Ma.