山东省蒙阴地区金刚石原生矿形成时代的讨论

Discussion on Forming Age of Primary Diamond Ore in Mengyin Area of Shandong Province

摘要:

到哪些地方去找未发现的金刚石原生矿,这就涉及到金刚石原生矿的形成时代问题。正确认识蒙阴地区金刚石原生矿的形成时代，不仅有重要的理论意义，而且具有重要的现实找矿指导作用。地质证据表明，蒙阴地区金刚石原生矿形成时代为白垩纪，同位素测年表明，蒙阴地区金伯利岩形成时代远早于白垩纪，通过对以往地质资料的研究，认为同位素测试年龄是多解性的，应结合相关地质证据确定其形成时代。

Abstract:

Where to look for undiscovered primary diamond ore involves the forming of primary diamond ore. Correct understanding oreforming age of primary diamond ore not only has important theoretical significance, but also has important practical guidance to mineral prospecting. As showed by geological evidences, the oreforming age of primary diamond ore is Cretaceous period. As showed by isotopic dating, the oreforming age of kimberlite in Mengyin area is far earlier than Cretaceous period. Based on previous geological data, it is regarded that isotope test age is not very correct. Its forming age should be determined combining with related geological evidences.