摘要
华北地台东部有６个金伯利岩岩区，它们分布于古陆核的中心（如富矿的复县一蒙阴）、北缘（如贫矿的铁岭）及西缘元古代裂陷带（如无矿的涉县一鹤壁）。本文在不相容元素、同位素源区约束讨论的基础上，选择代表性的金伯利岩进行源区地球化学定量反演，进而讨论了源区的不均一性。金伯利岩产出的构造部位及由此所反映的岩石圈厚度、地慢流体活动强度的差异，不仅影响金伯利岩含金刚石性。
There are six kimberliric fields in Eastern North China paltform. These kimberlites located at the center (such a. diamond - bearing kimberlites in Fuxian and Mongyin),north ridge (such as diamond-poor kimberlites in Tieling) , and west ridge ( such as barren kimberlites in Hebi and Shexian ). Based on the discussion of sources constrained on trace elements , Sr and Nd isotopic elements , the kimberlites in represen- tative fields are chosen to invest ggeochemical characters of their sources, and the het- erogeneity of the sources are discussed moreover. The tectonic positions and their mean- ing on the depth of lithosphere and mantle fluid activity , affected not only the diamonds potential but also the heterogeneity of kimberlitic sources.
关键词
金伯利岩
地球化学
华北地台
地幔源区
heterogeneity in sources , kimberlite, geochemistry , North China Plat- form
