奥尔哈米特:在上层地幔中,它是C-O-S-Ca循环的新环节,也是行星可居住性的指标
Yuegao Liu1,2, I-Ming Chou1, Jiangzhi Chen1,2
1CAS Key Laboratory for Experimental Study under Deep-sea Extreme Conditions, Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Sanya 572000, China.
National science review
|September 6, 2023
概括
以前认为仅在太阳星云中形成的Oldhamite (CaS) 可以在地球上层地幔中形成. 这一发现对了解早期地球大气层和C-O-S-Ca循环具有重要意义.
科学领域:
- * 地质化学和石化学
- * 星球科学 星球科学
- * 宇宙化学 * 宇宙化学
背景情况:
- *奥尔德哈米特 (CaS) 是一种矿物质,通常存在于恩斯塔提特 (enstatite) 混凝土中,据信是由太阳星云气体凝结形成的.
- * 它的形成机制对于理解太阳星云,石,地球起源和C-O-S-Ca周期至关重要.
- *之前没有在地幔岩石中报告过奥尔德哈米特.
研究的目的:
- * 为了研究在上层地幔条件下老汉石形成的可能性.
- * 探索与地球和外星环境相关的旧胺合成的新途径.
- * 评估老矿在不同地质环境中的稳定性和影响.
主要方法:
- * 实验性石矿学,涉及硫化物载体正氧化石和化碳酸盐 (CaCO3) 之间的反应.
- * 在高压 (0.31.5 GPa) 和高温 (12731510 K) 进行的实验.
- * 反应产物和条件的分析,包括氧气流动性.
主要成果:
- *成功合成了来自硫化物载体正氧化和化CaCO3.3的反应的奥尔哈米特 (CaS).
- *形成的压力和温度与上层地幔条件相符.
- * 反应发生在氧气流动度显著高于太阳星云形成的氧气流动度.
结论:
- *奥尔德汉米特可以在地球上层地幔内形成,挑战以前的形成模型.
- *奥尔德哈米特的稳定性需要低氧流动性,低大气氧和有限的水,这些条件可能存在于早期的地球上.
- *奥尔德汉米特的存在可以解释早期的大气低氧,并影响了大气变化,例如在米-三叠纪边界期间.
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