下地幔含(Al,Fe)桥辉石结构的单晶x射线衍射研究

IF 2.7 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

American Mineralogist Pub Date : 2023-08-01 DOI:10.2138/am-2023-8969

S. Fu, S. Chariton, Yanyao Zhang, T. Okuchi, V. Prakapenka, Jung‐Fu Lin

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引用次数: 0

摘要

在这里，我们在boeler - almax型金刚石砧池中对两个高质量的(Al,Fe)含桥菱石14 (Mg 0.88 Fe 3+0.065 Fe 2+0.035 Al 0.03)(Al 0.11 Si 0.90)O 3 (Fe10-Al14-Bgm)晶体片进行了单晶x射线衍射(SCXRD)实验，室温为64.6(6)GPa。对收集到的SCXRD - 16图谱进行细化，得到了单晶Fe10-Al14-Bgm的可靠结构信息，包括单元-17胞参数、原子坐标和各向异性位移参数。结合Mössbauer和电子探针分析，我们的最佳单晶精化模型表明我们的样品在大的伪十二面体位点(A位)含有~6.5 mol% fe3 +， 3.5 mol% fe2 +和3 mol% Al 3+，在小的八面体位点(B位)含有~11 mol% Al 3+。这可能表明铝3+在桥菱石中优先占据B位。我们的结果显示

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Single-Crystal X-ray Diffraction on the Structure of (Al,Fe)-bearing Bridgmanite in the Lower Mantle

12 Here we have performed single-crystal X-ray diffraction (SCXRD) experiments on two high-13 quality crystal platelets of (Al,Fe)-bearing bridgmanite 14 (Mg 0.88 Fe 3+0.065 Fe 2+0.035 Al 0.03 )(Al 0.11 Si 0.90 )O 3 (Fe10-Al14-Bgm) up to 64.6(6) GPa at room 15 temperature in a Boehler-Almax type diamond anvil cell. Refinements on the collected SCXRD 16 patterns reveal reliable structural information of single-crystal Fe10-Al14-Bgm, including unit-17 cell parameters, atomic coordinates, and anisotropic displacement parameters. Together with 18 Mössbauer and electron microprobe analyses, our best single-crystal refinement model indicates 19 that our sample contains ~6.5 mol% Fe 3+ , 3.5 mol% Fe 2+ , and 3 mol% Al 3+ in the large pseudo-20 dodecahedral site (A site), and ~11 mol% Al 3+ in the small octahedral site (B site). This may 21 indicate that Al 3+ in bridgmanite preferentially occupies the B site. Our results show

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来源期刊

American Mineralogist 地学-地球化学与地球物理

CiteScore

5.20

自引率

9.70%

发文量

276

审稿时长

1 months

期刊介绍： American Mineralogist: Journal of Earth and Planetary Materials (Am Min), is the flagship journal of the Mineralogical Society of America (MSA), continuously published since 1916. Am Min is home to some of the most important advances in the Earth Sciences. Our mission is a continuance of this heritage: to provide readers with reports on original scientific research, both fundamental and applied, with far reaching implications and far ranging appeal. Topics of interest cover all aspects of planetary evolution, and biological and atmospheric processes mediated by solid-state phenomena. These include, but are not limited to, mineralogy and crystallography, high- and low-temperature geochemistry, petrology, geofluids, bio-geochemistry, bio-mineralogy, synthetic materials of relevance to the Earth and planetary sciences, and breakthroughs in analytical methods of any of the aforementioned.