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Commensurate Growth of Magnetite Microinclusions in Olivine under Mantle Conditions
ACS Earth and Space Chemistry ( IF 2.9 ) Pub Date : 2020-06-08 , DOI: 10.1021/acsearthspacechem.0c00026 Marcello Campione 1 , Mattia La Fortezza 1 , Matteo Alvaro 2 , Marco Scambelluri 3 , Nadia Malaspina 1
ACS Earth and Space Chemistry ( IF 2.9 ) Pub Date : 2020-06-08 , DOI: 10.1021/acsearthspacechem.0c00026 Marcello Campione 1 , Mattia La Fortezza 1 , Matteo Alvaro 2 , Marco Scambelluri 3 , Nadia Malaspina 1
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Magnetite-bearing multiphase solid inclusions hosted in metamorphic olivine have been interpreted as final products of the trapping of the aqueous fluid produced by the subduction-zone dehydration of former serpentinites. We provide here a careful analysis performed by microfocus single-crystal X-ray diffraction of inclusions found in harzburgites from the Almirez Complex (Bétic Cordillera, Spain) to determine the occurrence of preferential crystallographic orientation relationships between the olivine host and the magnetite inclusion. The results demonstrate that the magnetite–olivine interface selectively displays parallelism between crystallographic planes (111) and (100) and between crystallographic directions ⟨110⟩ and ⟨011⟩, respectively. This evidence points to a clear epitaxial growth of magnetite on olivine. The calculation of the geometrical misfit between the two lattices in contact as a function of their relative azimuthal orientation shows that, under the aforementioned reciprocal orientation, a perfect commensurism is achieved; i.e., all of the nodes of the magnetite lattice coincide with nodes of the olivine lattice. This particular relationship must be interpreted as a unique occurrence, playing a fundamental role in favoring the heterogeneous nucleation of magnetite on olivine.
中文翻译：
地幔条件下橄榄石中磁铁矿微包裹体的相应生长
变质橄榄石中所含的含磁铁矿的多相固体包裹体已被解释为捕集前蛇纹岩的俯冲带脱水所产生的含水流体的最终产物。我们在这里通过微焦点单晶X射线衍射对Almirez配合物（西班牙贝蒂克科迪勒拉，西班牙）的哈兹伯格岩中发现的夹杂物进行了仔细的分析，以确定橄榄石主体与磁铁矿包裹体之间优先的晶体取向关系的发生。结果表明，磁铁矿-橄榄石界面选择性地显示出晶体学平面（111）和（100）之间以及晶体学方向⟨110⟩和⟨011⟩之间的平行性。该证据表明橄榄石上磁铁矿明显外延生长。根据接触的两个晶格之间相对方位取向的函数计算几何失配表明，在上述的相互取向下，可以实现完美的同感。也就是说，磁铁矿晶格的所有节点都与橄榄石晶格的节点一致。这种特殊的关系必须被解释为唯一的现象，在促进橄榄石上磁铁矿的异质形核方面起着基本作用。
更新日期：2020-06-18
中文翻译：
地幔条件下橄榄石中磁铁矿微包裹体的相应生长
变质橄榄石中所含的含磁铁矿的多相固体包裹体已被解释为捕集前蛇纹岩的俯冲带脱水所产生的含水流体的最终产物。我们在这里通过微焦点单晶X射线衍射对Almirez配合物（西班牙贝蒂克科迪勒拉，西班牙）的哈兹伯格岩中发现的夹杂物进行了仔细的分析，以确定橄榄石主体与磁铁矿包裹体之间优先的晶体取向关系的发生。结果表明，磁铁矿-橄榄石界面选择性地显示出晶体学平面（111）和（100）之间以及晶体学方向⟨110⟩和⟨011⟩之间的平行性。该证据表明橄榄石上磁铁矿明显外延生长。根据接触的两个晶格之间相对方位取向的函数计算几何失配表明，在上述的相互取向下，可以实现完美的同感。也就是说，磁铁矿晶格的所有节点都与橄榄石晶格的节点一致。这种特殊的关系必须被解释为唯一的现象，在促进橄榄石上磁铁矿的异质形核方面起着基本作用。
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