...
  • 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 >Metamorphic CO2 production from calc-silicate rocks via garnet-forming reactions in the CFAS–H2O–CO2 system
【24h】

Metamorphic CO2 production from calc-silicate rocks via garnet-forming reactions in the CFAS–H2O–CO2 system

机译：在CFAS–H2O–CO2系统中，通过石榴石形成反应从钙硅酸盐岩石中变质产生CO2

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 type and kinetics of metamorphic CO2-producing processes in metacarbonate rocks is of importance to understand the nature and magnitude of orogenic CO2 cycle. This paper focuses on CO2 production by garnet-forming reactions occurring in calc-silicate rocks. Phase equilibria in the CaO–FeO–Al2O3–SiO2–CO2–H2O (CFAS–CO2–H2O) system are investigated using P–T phase diagrams at fixed fluid composition, isobaric T–X(CO2) phase diagram sections and phase diagram projections in which fluid composition is unconstrained. The relevance of the CFAS–CO2–H2O garnet-bearing equilibria during metamorphic evolution of calc-silicate rocks is discussed in the light of the observed microstructures and measured mineral compositions in two representative samples of calc-silicate rocks from eastern Nepal Himalaya. The results of this study demonstrate that calc-silicate rocks may act as a significant CO2 source during prograde heating and/or early decompression. However, if the system remains closed, fluid–rock interactions may induce hydration of the calc-silicate assemblages and the in situ precipitation of graphite. The interplay between these two contrasting processes (production of CO2-rich fluids vs. carbon sequestration through graphite precipitation) must be considered when dealing with a global estimate of the role exerted by decarbonation processes on the orogenic CO2 cycle.
机译：碳酸盐岩中变质CO2产生过程的类型和动力学对于理解造山CO2循环的性质和大小具有重要意义。本文主要关注钙硅酸盐岩石中发生的石榴石形成反应产生的二氧化碳。使用固定流体组成下的PT相图，等压T–X（CO2）相图截面和相图投影，研究了CaO–FeO–Al2O3–SiO2–CO2–H2O（CFAS–CO2–H2O）系统中的相平衡其中流体成分不受限制。结合尼泊尔喜马拉雅东部两个代表性的钙硅酸盐岩样品的观察到的微观结构和实测矿物组成，讨论了钙硅酸盐岩变质演化过程中CFAS-CO2-H2O石榴石平衡的相关性。这项研究的结果表明，钙硅酸盐岩石可能在推进加热和/或早期减压过程中充当重要的CO2来源。但是，如果系统保持关闭状态，则流体与岩石的相互作用可能会引起钙硅酸盐组合物的水合作用以及石墨的原位沉淀。当处理脱碳过程在造山CO2循环中所起的作用的总体估计时，必须考虑这两个相反过程之间的相互作用（富CO2流体的产生与通过石墨沉淀的碳固存）。

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