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Meteoryt Campo del Cielo – podstawowe badania mineralogiczne wybranego okazu

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Boczkowska M., Wójcik-Tabol P.
Acta Societatis Metheoriticae Polonorum
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2021
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vol. 12
17-30
EN
The carried out research concern Campo del Cielo meteorite. The specimen is a fragment of a meteoroid, which fall occurred 3950±90 years ago, in the northern areas of present-day Argentina. The aim of the study was a comparative analysis of the fragment in relation to the characteristics of the whole meteoroid, as well as gathering the existing knowledge about the meteorite rain Campo del Cielo. Metallographic section was made and then a series of point and area analyzes of the chemical composition were carried out in a scanning electron microscope. The metallic phase of the meteorite turned out to be relatively chemically homogeneous. The iron content for each area subjected to EDS microanalysis was in the range of 90–93%, while nickel content oscillated in the range of 6–10%. The distinct dominance of iron, which appears on the whole surface of the meteorite, indicates that the metallic phase is made of a kamacite crystal. The whole fragment can be called hexahedrite. Inclusions occupy a small percentage of the surface area of metallographic section. They were divided into inclusions containing phosphorus and other inclusions (containing Si, O, Ca, Al, Na). The occurrences of phosphorus associated with iron and nickel (subordinate) were identified as schreibersite [(Fe,Ni)3P]. This mineral showed interesting structures from the demixing and a certain regularity in distribution relative to the other inclusions. The research supplement the current knowledge about the whole meteoroid, confirming at the same time its heterogeneity. Despite the fact that it was part of the Campo del Cielo meteoroid before its disintegration, it has a chemical and structural composition characteristic only for itself, even if we talk about a slight deviation from the averaged features for the entire meteorite.
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Effect of Mg and Ca on the Characteristics of Inclusions in Sulphur Steel

86%
Tian J., Qu T., Wang D., Wang H., Xu Z., Xinrui E.
Archives of Metallurgy and Materials
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2018
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vol. 63
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issue 4
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