...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Contributions to Mineralogy and Petrology >Diamond resorption features as a new method for examining conditions of kimberlite emplacement
【24h】

Diamond resorption features as a new method for examining conditions of kimberlite emplacement

机译：钻石吸收特征是一种检查金伯利岩沉积条件的新方法

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The study develops a new approach utilizing parameters of trigonal etch pits on diamond crystals to infer the conditions of diamond residence in kimberlite magma. Diamond crystals from dissolution experiments conducted at 1 GPa and 1150-1350 degrees C in the presence of H2O-rich or CO2-rich fluid were studied with atomic force microscopy (AFM). The AFM data of resorbed diamond surfaces show that much deeper surface relief was produced in CO2 fluid. It also clearly distinguishes the profiles of the trigonal etch pits forming regular flat-bottomed trigons in H2O fluid, and round-or pointed-bottomed trigons in CO2 fluid. The relationship between the diameter and the depth of the trigonal pits is found to be another important indicator of the fluid composition. Dissolution in H2O fluid develops trigons with constant diameter and variable depth where the diameter increases with temperature. Trigons developed in CO2 fluid have a large range of diameters showing a strong positive correlation with the depth. The developed criteria applied to the natural diamond crystals from three Ekati Mine kimberlites indicate significant variation in CO2-H2O ratio and temperature of their magmatic fluid. This conclusion based on diamond resorption agrees with the mineralogy of microphenocrysts and groundmass of the studied kimberlites offering new method to study crystallization conditions of kimberlite magma.
机译：该研究开发了一种新方法，该方法利用金刚石晶体上的三角形蚀刻坑参数来推断金伯利岩岩浆中金刚石的滞留条件。使用原子力显微镜（AFM）研究了在富含H2O或富含CO2的流体存在下，在1 GPa和1150-1350摄氏度下进行的溶出度实验中的金刚石晶体。吸收的金刚石表面的AFM数据表明，在CO2流体中产生了更深的表面起伏。它还清楚地区分了在H2O流体中形成规则的平底三角形和在CO2流体中形成圆角或尖头三角形的三角形蚀刻坑的轮廓。发现三角坑的直径和深度之间的关系是流体成分的另一个重要指标。在H2O流体中的溶解会形成具有恒定直径和可变深度的三角形，其中直径随温度增加而增加。在CO2流体中形成的三角形具有较大的直径范围，与深度之间显示出很强的正相关性。应用于三个Ekati矿金伯利岩的天然钻石晶体的已开发标准表明，CO2-H2O比率及其岩浆液温度存在显着变化。这一基于钻石吸收的结论与所研究的金伯利岩的微隐晶和地层矿物学相吻合，为研究金伯利岩浆的结晶条件提供了新的方法。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号