1986～1988年中英双方在山东合作勘查金刚石期间,英方对山东蒙阴地区已发现的红旗1号、6号、胜利1号、2号和辽宁马圈50、51号金伯利岩岩体的侵位时代,用铷-锶法(云母样品)和铀-铅法(钙钛矿样品)进行了测试,获得的同位素年龄为4.5～4.9亿年,平均为4.6亿年,也就是说,山 During the period from 1986 to 1988 when China and Britain cooperated in exploring diamonds in Shandong, the British side investigated the occurrence of red flag 1, 6, Victory No. 1 and No. 2 and the No. 51 and No. 51 Ma Zongliao kimberlite in the Mengyin area of ​​Shandong Province During the emplacement period, the isotopes were measured with rubidium-strontium method (mica sample) and uranium-lead method (perovskite sample). The isotopic ages were between 450 and 490 million years, with an average of 460 million years. That is to say,