...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Experimental constraints on the chemical evolution of large icy satellites
【24h】

Experimental constraints on the chemical evolution of large icy satellites

机译：大型冰冷卫星化学演化的实验约束

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

We derive experimental constraints on the interior structure and mineralogy of large icy satellites by reacting material of chondritic chemistry with water at a pressure of 1.5 GPa, temperatures between 300 ℃ and 800 ℃ and a range of oxygen fugacities. Our results document the existence of three chemical processes that probably occur in large icy satellites as a result of high pressure hydrothermal processing: (1) the formation of low-density hydrated silicates, (2) the alloying of iron and sulfur to form FeS-dominated cores, and (3) the instability of organic material relative to carbonates. We construct new internal models of the thermal and structural state of Ganymede, and infer that the magnetic field of this body arises from convection within a mostly iron sulfide core. Simple thermochemical calculations are conducted to further explore the likely effects of composition and oxygen fugacity on the high pressure chemistry undergone by organic material within icy satellites. Both experimental and calculated results show that primordial organics are likely to have been largely oxidized to carbonates through hydrothermal processing early in Ganymede's history, potentially sterilizing Ganymede's H_2O layer.
机译：通过使软骨化学物质与水在1.5 GPa的压力，300℃至800℃的温度以及一定范围的氧逸度下反应，得出大型冰卫星内部结构和矿物学的实验约束。我们的研究结果表明，高压水热处理可能会在大型冰卫星上发生三种化学过程：（1）低密度水合硅酸盐的形成;（2）铁和硫合金化形成FeS- （3）有机材料相对于碳酸盐的不稳定性。我们构建了木卫三的热状态和结构状态的新内部模型，并推断该主体的磁场是由主要是硫化铁核内的对流引起的。进行了简单的热化学计算，以进一步探讨组成和氧逸度对冰卫星内有机物质经历的高压化学作用的可能影响。实验和计算结果均表明，在Ganymede的早期历史中，原始有机物很可能已通过水热处理被大部分氧化为碳酸盐，可能对Ganymede的H_2O层进行了灭菌。

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