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地幔矿物岩石中的流体（气体）含量数据

已有 467 次阅读 2026-9-30 12:47 |个人分类:地球科学|系统分类:科研笔记

对象	已有定量数据的主要气体	常见含量范围（天然地幔样品）	主要方法
橄榄石	结构 OH/H₂O	多为 <5–100 ppm H₂O；MORB 源平衡橄榄石约 7–27 ppm，OIB 源约 40–133 ppm	偏振 FTIR、SIMS、NanoSIMS
斜方辉石、单斜辉石	结构 OH/H₂O	通常数十至数百 ppm；常高于共生橄榄石，是地幔橄榄岩中 H 的重要载体	FTIR、SIMS
石榴子石、尖晶石	OH/H₂O	常为几至数十 ppm，局部可更高	FTIR、SIMS
过渡带瓦兹利石、林伍德石	OH/H₂O	实验与包裹体资料可达数千 ppm 至质量分数％级	FTIR、SIMS、高压实验
地幔橄榄岩/捕虏体整体	总碳（CO₂、碳酸盐、金刚石、石墨、有机质等）	<1 至接近 10,000 ppm C；一般亏损橄榄岩较低，交代富集样品可很高	燃烧–IRMS、SIMS、拉曼、显微包裹体
上地幔整体估算	C	约 350 ppm C，估计范围 117–669 ppm	全球玄武岩—熔融模型
橄榄岩、橄榄石/辉石包裹体	He、Ne、Ar、Kr、Xe	通常为极低丰度，常以 \(10^{-12}\)–\(10^{-8}\) cm³ STP g⁻¹ 级报告；重点价值在同位素和元素比值	真空破碎、阶梯加热、稀有气体质谱
蛇纹岩化超镁铁岩	H₂、CH₄、CO₂、CO、N₂、He	含量变化极大，取决于蛇纹石化程度、氧逸度与流体来源；H₂、CH₄多集中于裂隙和流体包裹体	真空破碎/加热、GC、GC–MS、IRMS、Raman
地幔捕虏体流体包裹体	CO₂ 为主，伴 He、N₂、H₂O、CH₄、CO、H₂、Ar 等	以包裹体的密度、压力和摩尔组成报告更可靠，不能直接等同于晶格含量	Raman、显微测温、LA-ICP-MS、真空破碎质谱

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