DOI: 10.1016/j.epsl.2020.116598
论文题名: Incompatibility of argon during magma ocean crystallization
作者: Jackson C.R.M. ; Williams C.D. ; Du Z. ; Bennett N.R. ; Mukhopadhyay S. ; Fei Y.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 553 语种: 英语
中文关键词: argon
; magma ocean
; partitioning
; solubility
英文关键词: Ablation
; Electron probe microanalysis
; Experimental mineralogy
; High pressure effects in solids
; Inert gases
; Laser ablation
; Liquids
; Mass spectrometry
; Minerals
; Oceanography
; Piles
; Silica
; Solubility
; Argon concentration
; Crystallizing magma
; Electron microprobes
; Equilibrium distributions
; Fluid inclusion
; High-pressure phasis
; Laser-heated diamond anvil cells
; Neutral species
; Argon lasers
; argon
; concentration (composition)
; crystallization
; electron probe analysis
; experimental study
; igneous geochemistry
; magma chamber
; mass spectrometry
; oceanic lithosphere
英文摘要: We report results from multi-anvil (MA) and laser-heated diamond anvil cell (LH-DAC) experiments that synthesize high-pressure phases, including bridgmanite, ferropericlase, stishovite, and ultramafic liquid, in the presence of an argon-rich fluid. The goal of the experiments is to constrain the equilibrium distribution of argon in magma ocean environments. Argon concentrations in LH-DAC experiments were quantified by electron microprobe analysis, while argon concentrations in MA experiments were quantified by laser-ablation mass spectrometry and electron microprobe analysis. Our LH-DAC experiments demonstrate that argon solubility in ultramafic liquid is near or above 1.5 wt.% at conditions between 13–101 GPa and 2300–6300 K. Argon concentrations in bridgmanite and ferropericlase synthesized in LH-DAC experiments range from below detection to 0.58 wt.%. Argon concentrations in bridgmanite and ferropericlase synthesized in MA experiments range from below detection to 2.16 wt.% for electron microprobe measurements and laser-ablation measurements. We interpret this wide range of argon concentrations in minerals to reflect the variable presence of argon-rich fluid inclusions in analytical volumes. Our analyses therefore provide upper limit constraints for argon solubility in high-pressure minerals (<0.015 wt.%) across all mantle pressures and temperatures. The combination of relatively high argon solubility in ultramafic liquid (∼1.5 wt.%) and low argon solubility in minerals implies argon incompatibility (Dbridgmanite−meltAr < 0.01, Dferropericlase−meltAr < 0.01) during magma ocean crystallization and that the initial distribution of argon, and likely other neutral species, may be controlled by liquids trapped in a crystallizing magma ocean. We thus predict a basal magma ocean would be enriched in noble gases relative to other regions of the mantle. Moreover, we predict that the noble gas parent-daughter ratio of magma ocean cumulates pile will increase with crystallization, assuming refractory and incompatible behavior for parent elements. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165525
Appears in Collections: 气候变化与战略
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作者单位: Department of Earth and Environmental Sciences, Tulane University, United States; Earth and Planetary Sciences Department, University of California, Davis, United States; State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China; Department of Chemistry and Biochemisry, California State University, East Bay, United States; Earth and Planets Laboratory, Carnegie Institution for Science, United States
Recommended Citation:
Jackson C.R.M.,Williams C.D.,Du Z.,et al. Incompatibility of argon during magma ocean crystallization[J]. Earth and Planetary Science Letters,2021-01-01,553