Potential of Earth's core as a reservoir for noble gases: Case for helium and neon
Potential of Earth's core as a reservoir for noble gases: Case for helium and neon
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DOI：
10.7185/geochemlet.2028
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发表时间：
2020-09-09
影响因子：
4.9
通讯作者：
Marty, B.
中科院分区：
文献类型：
--
作者：
Bouhifd, M. A.;Jephcoat, A. P.;Marty, B.
本研究调查的可能条件下的早期地球的核心形成的氖（D-Ne）的金属硅酸盐分区：高达16 GPa，类似于3000 K和IW-2附近的氧逸度（2个日志单位低于铁-Wustite缓冲区）。我们发现D-Ne系数在10（-2）到10（-1）之间。这些分配系数只是早期地球内部惰性气体分布的控制因素之一：因为即使D-He和D-Ne很低（类似于10（-4）），地幔中也可能存在足够的惰性气体，为地核提供大量的He和Ne。假设熔融的原始地球与星云气体成分和伴随的金属硅酸盐分化的气体熔融平衡，地核将继承并保持整个地球历史的高He-3/He-4比率和低He-3/Ne-22比率（
This study investigates metal-silicate partitioning of neon (D-Ne) under the likely conditions of early Earth's core formation: up to 16 GPa, similar to 3000 K and an oxygen fugacity near IW-2 (2 log units below the Iron-Wustite buffer). We find that the D-Ne coefficients range between 10(-2) and 10(-1). These partition coefficients are only one of the controlling factors of noble gas distributions within the early Earth: because, even if D-He and D-Ne are low (similar to 10(-4)), there may have been sufficient noble gases present in the mantle to supply a significant quantity of He and Ne to the core. Assuming gasmelt equilibrium of the molten proto-Earth with a nebular gas composition and concomitant metal-silicate differentiation, the core would have inherited and maintained throughout Earth's history high He-3/He-4 ratios and low He-3/Ne-22 ratios (