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Seawater subduction controls the heavy noble gas composition of the mantle

机译：海水俯冲控制地幔中的重惰性气体成分

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摘要

The relationship between solar volatiles and those now in the Earth's atmosphere and mantle reservoirs provides insight into the processes controlling the acquisition of volatiles during planetary accretion and their subsequent evolution. Whereas the light noble gases ( helium and neon) in the Earth's mantle preserve a solar-like isotopic composition, heavy noble gases ( argon, krypton and xenon) have an isotopic composition very similar to that of the modern atmosphere, with radiogenic and ( in the case of xenon) solar contributions. Mantle noble gases in a magmatic CO2 natural gas field have been previously corrected for shallow atmosphere/groundwater and crustal additions. Here we analyse new data from this field and show that the elemental composition of non-radiogenic heavy noble gases in the mantle is remarkably similar to that of sea water. We challenge the popular concept of a noble gas `subduction barrier' - the convecting mantle noble gas isotopic and elemental composition is explained by subduction of sediment and seawater-dominated pore fluids. This accounts for similar to 100% of the non-radiogenic argon and krypton and 80% of the xenon. Approximately 50% of the convecting mantle water concentration can then be explained by this mechanism. Enhanced recycling of subducted material to the mantle plume source region then accounts for the lower ratio of radiogenic to non-radiogenic heavy noble gas isotopes and higher water content of plume-derived basalts.
机译：太阳挥发物与现在在地球大气层和地幔库中的挥发物之间的关系提供了对在行星增生期间控制挥发物的获取及其后续演化的过程的深入了解。地幔中的轻质稀有气体（氦和氖）保留了类似太阳的同位素组成，而重质稀有气体（氩气，k和氙气）的同位素组成与现代大气非常相似，并且具有放射性和氙）太阳能贡献。岩浆CO2天然气田中的地幔稀有气体先前已针对浅层大气/地下水和地壳添加进行了校正。在这里，我们分析了来自该领域的新数据，并表明地幔中非放射性重惰性气体的元素组成与海水非常相似。我们挑战稀有气体“俯冲屏障”的流行概念-对流地幔稀有气体的同位素和元素组成是通过俯冲沉积物和海水为主的孔隙流体来解释的。这约占非放射性氩和100的100％和氙的80％。然后可以通过该机理解释对流地幔水浓度的大约50％。俯冲物质向地幔柱羽源区的再循环增强，这说明了放射性与非放射性重质惰性气体同位素的比例较低，而羽状玄武岩的含水量较高。

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