• 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 >CO2 fluid inclusions in Jack Hills zircons
【24h】

CO2 fluid inclusions in Jack Hills zircons

机译：杰克山锆石中的二氧化碳流体夹杂物

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 discovery of Hadean to Paleoarchean zircons in a metaconglomerate from Jack Hills, Western Australia, has catalyzed intensive study of these zircons and their mineral inclusions, as they represent unique geochemical archives that can be used to unravel the geological evolution of early Earth. Here, we report the occurrence and physical properties of previously undetected CO2 inclusions that were identified in 3.36-3.47 Ga and 3.80-4.13 Ga zircon grains by confocal micro-Raman spectroscopy. Minimum P-T conditions of zircon formation were determined from the highest density of the inclusions, determined from the density-dependence of the Fermi diad splitting in the Raman spectrum and Ti-in-zircon thermometry. For both age periods, the CO2 densities and Ti-in-zircon temperatures correspond to high-grade metamorphic conditions (>= 5 to >= 7 kbar/similar to 670 to 770 degrees C) that are typical of mid-crustal regional metamorphism throughout Earth's history. In addition, fully enclosed, highly disordered graphitic carbon inclusions were identified in two zircon grains from the older population that also contained CO2 inclusions. Transmission electron microscopy on one of these inclusions revealed that carbon forms a thin amorphous film on the inclusion wall, whereas the rest of the volume was probably occupied by CO2 prior to analysis. This indicates a close relationship between CO2 and the reduced carbon inclusions and, in particular that the carbon precipitated from a CO2-rich fluid, which is inconsistent with the recently proposed biogenic origin of carbon inclusions found in Hadean zircons from Jack Hills.
机译：从西澳大利亚杰克山的Metaconglomeration的哈萨努埃尔·古地基Zircons发现，催化了对这些锆石及其矿物质夹杂物的密集研究，因为它们代表了独特的地球化学档案，可用于解开早期地球的地质演变。在这里，我们通过共聚焦微拉曼光谱法报告以3.36-3.47Ga和3.80-4.13族Ga锆石颗粒中鉴定的先前未检测到的CO 2夹杂物的发生和物理性质。从夹杂物的最高密度确定锆形成的最小P-T条件，从拉曼光谱和Ti-in-in-in-in-in-in-in-in-in-in-in-in-in-in-in-in-in-in-in-in-in-in-in-in-in-in-in-in-in-in-in-in-in-in-in-in-in-in-in-in-in-in-in-in-in-in-in-in-in-in-zircon温度测定。对于年龄期间，CO 2密度和Ti-in-in-in-in-in-in-in-in-in-in-in-> = 5至> = 7 kbar /类似于670至770℃），其在整个中外区域变质的典型地球的历史。此外，完全封闭的，在较旧群体中的两个锆石谷物中鉴定出也含有CO 2夹杂物的两种锆石颗粒。这些夹杂物之一上的透射电子显微镜显示碳在包涵壁上形成薄的无定形膜，而在分析之前，该体积的其余部分可能被CO 2占用。这表明二氧​​化碳和降低的碳夹杂物之间的密切关系，特别是从富含二氧化碳的流体中沉淀的碳，这与来自Jack Hills的Hadean Zircons发现的最近提出的碳含量不一致。

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