一、我国含金刚石古沉积层位 (一)第三系 1.山东某盆地北侧,下第三系官庄组砂砾岩和大汶口组石灰质砾岩、角砾岩中,含铬镁榴石,经对比与北侧产金刚石金伯利岩中的矿物特征一致。山东另一盆地以南地段,普遍发现含有金刚石的砾岩或砂砾岩块,充填于不同标高(80—540米)的寒武系、奥陶系石灰岩的裂隙、溶洞、溶沟中。含金刚石砾岩有90％以上见于中、上寒武统的岩溶负地形中,金 (1) Tertiary 1. In the northern part of a certain basin in Shandong Province, from the conglomerate of the Guzhuang Formation in the Lower Tertiary and the limestone conglomerate and breccia in the Dawenkou Formation, The rock, by contrast, is consistent with the mineral features of the diamond-bearing kimberlite in the north. In the south of another basin in Shandong, conglomerates or glutenite blocks containing diamonds are commonly found in fractures, caves and karst valleys of Cambrian and Ordovician limestones with different elevations (80-540 m). More than 90% of the diamond-bearing conglomerates are found in the Middle and Upper Cambrian karst negative terrain, gold