...
  • 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 formation during metasomatism of mantle eclogite by chloride-carbonate melt
【24h】

Diamond formation during metasomatism of mantle eclogite by chloride-carbonate melt

机译：氯化物 - 碳酸盐熔体在地幔eClogite的碳酸酯中的钻石形成

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

A xenolith of bimineralic eclogite from the Udachnaya kimberlite pipe provides a snapshot of interaction between mantle rocks and diamond-forming fluids/melts. The major-element composition of the eclogite is similar to that of N-MORB and/or oceanic gabbros, but its trace-element pattern shows the effects of mantle metasomatism, which resulted in diamond formation. The diamonds are clustered in alteration veins that crosscut primary garnet and clinopyroxene. The diamonds contain microinclusions of a fluid/melt dominated by carbonate and KCl. Compared to the worldwide dataset, the microinclusions in these diamonds fall in middle of the range between saline fluids and low-Mg carbonatitic melts. The fluid/melt acted as a metasomatic agent that percolated through ancient eclogitic rocks stored in the mantle. This interaction is consistent with calculated partition coefficients between the rock-forming minerals and diamond-forming fluid/melt, which are similar to experimentally-determined values. Some differences between the calculated and experimental values may be due to the low contents of water and silicates in the chloride-carbonate melt observed in this study, and in particular its high contents of K and LILE. The lack of nitrogen aggregation in the diamonds implies that the diamond-forming metasomatism took place shortly before the eruption of the kimberlite, and that the microinclusions thus represent saline carbonate-rich fluids circulating in the basement of lithospheric mantle (150-170km depth).
机译：来自Udachnaya Kimberlite管道的氨髓庚池的卵石提供了披风岩石和菱形流体/熔体之间的相互作用的快照。 Eclogite的主要元素组成类似于N-Morb和/或海洋Gabbros的主要组成，但其微量元素图案显示了披风弥言的影响，这导致金刚石形成。钻石聚集在横切静脉和Clinoceoxene的改变静脉中。钻石含有由碳酸酯和KCl主导的流体/熔体的微内计。与全球数据集相比，这些钻石中的微内印度在盐水液和低mg金属熔体之间的范围内。流体/熔体充当渗透到储存在地幔中的古野生岩石的态化剂。该相互作用与岩石形成矿物和菱形流体/熔体之间的计算分配系数一致，其类似于实验确定的值。计算和实验值之间的一些差异可能是由于本研究中观察到的氯化物 - 碳酸酯熔体中的水和硅酸盐的含量，特别是其高含量的K和乳液。钻石中缺乏氮气聚集意味着在金伯拉特爆发之前不久发生了菱形弥散，并且微生物是在岩石罩（150-170km深度）的基础上循环循环的富含盐水碳酸盐的液体。

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