辽宁铁岭地区金伯利岩的地球化学特征及其成因初探

RESEARCH ON GEOCHEMICAL CHARACTERISTICS AND PETROGENESIS OF KIMBERLITE IN TIELING, LIAONING PROVINCE

辽宁铁岭地区为一新的含矿金伯利岩区。本文利用地球化学方法对其成因做了些初步探讨。研究表明本区金伯利岩是由强富集型地幔即碳酸盐化的磷灰石-金云母-石榴石二辉橄榄岩经1％～2％的部分熔融形成的。富集型地幔的稀土元素丰度估算值为:La≈65×10^(-6),Ce≈105×10^(-6), Nd≈55×10^(-6),Sm≈8.20×10^(-6), Eu≈1.75×10^(-6)。

The paper has made primary research on the petrogenesis of the newly ore-bearing kimberlite area in Tieling, Liaoning Province by the study of the geochemical characteris- tics. The results demonstrate that Tieling kimberlite is formed from enriched mantle- carbonated apatite-phlogopite--garnet iherzolite by 1%～2% partial melting. The estimat- ed abundance of REE in enriched mantle is La≈5 ×10-6, Ce≈105 × 10-6, Nd≈55 × 10-6, Sm≈8. 20×10-6, Eu≈1. 75 × 10-6.