Incompatibility of argon during magma ocean crystallization
Incompatibility of argon during magma ocean crystallization
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岩浆海结晶过程中氩的不相容性
DOI：
10.1016/j.epsl.2020.116598
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发表时间：
2021
影响因子：
5.3
通讯作者：
Fei, Yingwei
中科院分区：
文献类型：
--
作者：
Jackson, Colin R.M.;Williams, Curtis D.;Du, Zhixue;Bennett, Neil R.;Mukhopadhyay, Sujoy;Fei, Yingwei
我们报道了在富Ar流体存在的情况下，合成高压相的多砧(MA)和激光加热金刚石砧腔(LH-DAC)实验的结果，这些高压相包括桥镁石、方镁石、辉钛矿和超镁铁液。这些实验的目标是限制Ar在岩浆海洋环境中的平衡分布。用电子探针分析来定量LHDAC实验中的Ar浓度，而用激光烧蚀质谱仪和电子探针分析来定量MA实验中的Ar浓度。我们的LH-DAC实验表明，在13-101 Gpa和2300-6300K之间的条件下，Ar在超镁铁液中的溶解度接近或超过1.5wt.%。在MA实验中合成的桥锰矿和方镁铁中的Ar浓度在电子探针测量和激光烧蚀测量中从低于检测到2.16wt.%不等。我们解释了矿物中这种大范围的Ar浓度，以反映在分析体积中富Ar流体包裹体的不同存在。因此，我们的分析提供了在所有地幔压力和温度范围内高压矿物(<；0.015重量%)中Ar溶解度的上限限制。相对较高的Ar在超镁铁质液体中的溶解度(∼1.5wt.%)和较低的Ar在矿物中的溶解度的组合意味着岩浆海洋结晶过程中的Ar不相容(D Brigmanite−熔体Ar<；0.01，D铁方镁石−熔体Ar<；0.01)，以及Ar的初始分布，以及可能的其他中性物种，可能受困于结晶岩浆海洋中的液体控制。因此，我们预测，相对于地幔的其他区域，基底岩浆海洋将富含稀有气体。此外，假设母元素为难熔和不相容的行为，我们预测岩浆海洋堆积体的稀有气体母子比将随着结晶的进行而增大。
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 (D bridgmanite− melt Ar< 0.01, D ferropericlase− melt Ar< 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.
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影响因子：
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DOI：
--
发表时间：
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期刊：
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