High resolution x-ray tomography as a tool for analysis of internal textures in meteorites

• Autorzy: Krzesińska A.
• Języki publikacji: EN

Abstrakty

EN

A comparison of internal textures of the NWA-5929, Ghubara and Pułtusk chondrites has been carried out using high resolution X-ray tomography. This is a powerful, non-destructive technique that allows on to determine textural and compositional dierences that occur between ordinary chondrites of various groups by means of grey-levels calehistograms, first-order statistics, and 3D imaging. Deformational structures in the Pułtusk meteorite such as cataclastic zones, impact melt clasts, melt veins, and melt pockets are observed and studied. Measurements of metal particle size are achieved, giving even deeper insight into textural features of meteorite. My approach shows that as shock deformation occurred, numerous small metal grains became progressively dispersed within the volume of the deformed Pułtusk meteorite rock. Simultaneously, metal was mobilized via frictional or direct impact melting to form scarce large metal nodules or grains arranged along the margins of relict chondritic clasts or as components of irregular injection veining. The possibility of tracing of these impact related processes by using tomography micrograms (without breaking the sample) is very useful for distinguishing which parts of each meteorite were deformed in diferent ways in order to make first order observations regarding the deformational history of these meteorites.

Słowa kluczowe

EN

NWA-5929; Ghubara; Pułtusk; high resolution X-ray computed tomography; deformation

PL

NWA-5929; Ghubara; Pułtusk; wysoka rozdzielczość X-ray tomografii komputerowej; deformacja

• Wydawca: Polish Meteorite Society ; Wrocław University of Science and Technology
• Czasopismo: Meteorites
• Rocznik: 2011
• Tom: Vol. 1, No. 1
• Strony: 3--12
• Opis fizyczny: Bibliogr. 29 poz., rys., tab.

Twórcy

autor

Krzesińska A.

• Polish Academy of Sciences, Institute of Geological Sciences, ul. Podwale 75, 50-449 Wrocław, Poland

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