FINE MORPHOLOGICAL FEATURES OF THE TERRESTRIAL WEATHERING PRODUCTS IN METEORITES

UDC 523.681

https://doi.org/10.15407/mineraljournal.38.02.033

S.N. Shyrinbekova

M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine

34, Acad. Palladina Pr., Kyiv-142, Ukraine, 03680

E-mail: cosmin@i.ua

FINE MORPHOLOGICAL FEATURES OF THE TERRESTRIAL WEATHERING PRODUCTS IN METEORITES

Language: Ukrainian

Mineralogical journal 2016, 38 (2): 33-45

Abstract: The summarized data on the morphology of terrestrial weathering products in the meteorite samples from the meteorite collection of the National Museum of Natural History of the NAS of Ukraine have been presented. The morphological classification of terrestrial weathering products in meteorite samples was proposed. Three morphological types of weathering products were classified for the first time — complanate, isometric and elongated, that characterize the spatial distribution and morphological characteristics of secondary minerals in meteorites. The corrosion and terrestrial weathering products are mainly associated with Fe-Ni metal in the uneven weathered meteorite samples. Secondary minerals are formed by predominant corrosion of α-(Fe-Ni) metal due to the phase and structure inhomogeneity of the meteoritic Fe-Ni alloy. The widely distributed secondary minerals in meteorites are iron oxides and hydroxides — goethite, limonite, lepidocrocite, maghemite and Cl-containing akaganéite. The minor secondary sulfides are framboidal pyrite and Cu-sulfide that were formed by weathering of troilite and possibly native copper. The presence of spherical aggregates of akaganéite containing up to 3—5 % Cl indicates the active corrosion of Fe-Ni metal in the samples of meteorite finds. This fact should be taken into account when storing meteoritic matter in the laboratory and meteorite collection in museums.

Keywords: meteorites, terrestrial weathering products, goethite, akaganéite, morphological classification.

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