摘要
本文对山东省蒙阴地区金伯利岩及金刚石,分别就sm-Nd、Rb-sr、C、O等同位素特征进行了初步研究。提出山东金伯利岩与世界其它地区一些金伯利岩中产出的金刚石,其δ^(13)C值完全一致,并认为金刚石的碳来源于上地幔,金刚石的的生长是不连续的。通过对金伯利岩Sm、Nd、Rb、Sr等的研究认为,山东金伯利岩来源于富集型上地幔,且有向亏损型上地幔转换的趋势;山东金伯利岩的岩石类型复杂多样,除金伯利岩自身原因外,另一原因是金伯利岩在上侵过程中与壳层岩石发生了同位素的强烈交代混染作用。
Isotopes Sm-Nd, Rb-Sr, δI3C,δ18O of kimberlite and diamond in Shandong Mengyin area are studied respectively in this paper. The authors point out that the concentration of δ13C in Shangdong kimberlite is the same with that in other kimberlites around the world and that the upper mantle provides carbor for the discontinuous growth of diamond. The Shandong kimberlite o-riginates from an enriched upper mantle, which is likely to change into a depleted one. Because of the intense isotopic replacement and contamination between the crustal rock and the kimberlite in its intrusive process, the petrology of Shandong kimberlite is complex and diverse.
出处
《地质科技情报》
CAS
CSCD
北大核心
1991年第S1期77-84,共8页
Geological Science and Technology Information
