| 金刚石形成的微观解释及其保存条件 |
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| 引用本文： | 肖湘萍.金刚石形成的微观解释及其保存条件[J].国土资源,1992(1). |
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| 作者姓名： | 肖湘萍 |
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| 作者单位： | 核工业北京地质研究院 100029 |
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| 摘 要： | 作者讨论了石墨转化为金刚石时的自由能变化和影响金刚石保存的物理化学因素。提出了复位效应这一概念,分析了释压速率、催化剂和水份等因素对金刚石保存的影响。人工合成金刚石的生产实践证实,在压力降低时,由于上述因素的影响,金刚石不稳定,并向石墨转化,金伯利岩中金刚石含矿性取决于多种因素:岩浆侵位的速度、冷凝速度、围岩水份以及岩浆化学成分。现有资料发明,金伯利岩体上部富金刚石,而往深部品位变贫且质量差,在一个岩管中往往中部富而边部渐贫。
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| 关 键 词： | 复位效应 释压速率 催化剂 水份 围岩 金伯利岩 金刚石 |
THE MICROSCOPIC EXPLAINATION ON THE DIAMOND FORMATION AND ITS PRESERVED CONDITIONS |
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| Xiao Xiangping.THE MICROSCOPIC EXPLAINATION ON THE DIAMOND FORMATION AND ITS PRESERVED CONDITIONS[J].Land & Resources,1992(1). |
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| Authors: | Xiao Xiangping |
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| Institution: | Beijing Research Institute of Uranium Geology 100029 |
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| Abstract: | This paper discussed the change of free-energy while graphite transforming into diamond and the physical-chemical factors affecting the preservation of diamond.It gives an idea of resilient effect and analyses the influence on diamond preservation by decompression speed, catalyst and water.The diamond can be transformed into graphite while the pressure is reduced due to the influence of above-mentioned factors.It has been proved by the practice of artificial diamond. The ore-bearing properties of diamond in kimberlite are decided by the four factors: the speed of magmatic emplacement and refrigeration,chemical composition of magma and wallrock water.The available information show that the tenor and quality of diamond in kimberlite get lower with the depth increasing, and in a kimberlite pipe, the more central, the higher the tenor. |
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| Keywords: | Resilient effect Decompression speed Catalyst Water Wallrock Kimberiite Diamond |
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