鲁中地区分布着100多个碳酸岩体，微量元素含量及稀土配分等均与世界典型碳酸岩相近。而碳酸岩的碳氧及斑晶磷灰石的锶、钛同位素组成与典型地幔物质有差异，与富集地幔颇为近似，从而证实在山东地区陆壳下存在富集地幔源区。 More than 100 carbonate bodies are distributed in the Luzhong area, and trace element contents and rare earth components are similar to the typical carbonate rocks in the world. However, the carbon and oxygen of the carbonate rock and the strontium and titanium isotopic composition of the apatite are different from those of the typical mantle materials, which are similar to that of the enriched mantle, which confirms the existence of enrichment mantle source area under the continental crust in Shandong Province.