概括
地幔中的二氧化石是地幔中的二氧化石.
科学领域:
- 地质化学 地质化学
- 石化学 石化学是一门学科.
- 矿物物理 矿物物理
背景情况:
- 地幔过程,如中洋山脊的脱气和潜伏区的再水,影响了C-H-O流体的物种化.
- 地矿的氧化状态与这些地过程和流体进化密切相关.
研究的目的:
- 为了研究来自各种构造环境的地幔周边矿石异岩的氧气流动性 (fo(2) .
- 了解氧化状态,流体组成和地球地幔中的地质过程之间的关系.
主要方法:
- 分析来自大陆和海洋环境的矿矿.
- 测量氧气流动性 (fo(2) 相对于法雅石-磁石-石英 (FMQ) 缓冲器.
- 对微量元素和同位素特征进行检查,以确定流体岩石相互作用.
主要成果:
- 大陆周边矿的石显示了广泛的度2) 范围 (相对于FMQ相对于-1.5到+1.5日志单位),在延伸区域的值较低.
- 来自俯冲区的氧化烯石 (fo(2) > FMQ 是两子载体,并显示出流体相互作用的证据.
- 海洋山脊形矿物减少 (相对于FMQ平均fo(2) ≈-0.9日志单位),与中海洋山脊玄武岩 (MORB) 玻璃相一致.
结论:
- 海洋大气层正在减少,CO2和H2O作为主导的流体物种,将MORB液体与残留的石结合起来.
- 俯冲区进入大陆石化层时,会产生带有混合星球和俯冲特征的异岩.
- 石质层流体中占有CO2和H2O的主导地位;原生碳 (钻石) 稳定性与深度和石榴石Fe3+) 含量有关.
相关概念视频
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