鲁中碳酸岩中磷灰石同位素地球化学研究

ISOTOPIC GEOCHEMISTRY OF APATITE FROM CARBONATITE IN CENTRAL SHANDONG

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。

There are over one hundred carbonatite bodies of Yenshanian age in the centTal part of Shandong Province. The contents of trace elements and REE distribution patterl1s of the rocks are similar to those of typical carbonatites in other parts of the world. Some differences are found in O and C isotopic composition between phenocryst apatite and typical mantle materials, but the apatite is similar to that from the enriched mantle. Therefore, the authors suggest that there exists an enriched mantle source region beneath the continental crust of Shandong Province.