Temat: thin sections - Katalog OPAC zbiorów

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Tytuł:: Petrologiczna i mineralogiczna charakterystyka chondrytu węglistego NWA 4967
Petrological and mineralogical characteristics of NWA 4967 carbonaceous chondrite
Autorzy:: Szurgot, Marian
Powiązania:: https://bibliotekanauki.pl/articles/1033012.pdf
Data publikacji:: 2014
Wydawca:: Polskie Towarzystwo Meteorytowe
Tematy:: NWA 4967
chondrites
extraterrestrial minerals
meteorites
optical microscopy
petrographic thin sections
Opis:: NWA 4967 carbonaceous chondrite thin section was investigated by optical microscopes in transmission and in reflection. Minerals of the meteorite have been identified and microstructure analyzed. Chondrules, matrix, metal phases, AOAs and CAIs are constituents of the rock, as expected. Olivine, clinopyroxene, orthopyroxene, troilite, kamacite and feldspar have been detected. Various types of chondrules including: PO, POP, PP, RP, BO, C, GOP and GO chondrules were identified. Compositional zoning of some olivines, diagnostic cracks in pyroxenes, clinopyroxene twins, and chondrule rims have been observed and analyzed. Our previous EPMA and Raman data as well as present optical data confirm that NWA 4967 belongs to CO3.2 chondrites, as previously classified.
Źródło:: Acta Societatis Metheoriticae Polonorum; 2014, 5; 121-148
2080-5497
Pojawia się w:: Acta Societatis Metheoriticae Polonorum
Dostawca treści:: Biblioteka Nauki

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Tytuł:: Statistical Assessment of the Microstructure of Barite Aggregate from Different Deposits Using X-Ray Microtomography and Optical Microscopy
Autorzy:: Żołek, N.
Ranachowski, Z.
Ranachowski, P.
Jóźwiak-Niedźwiedzka, D.
Kudela, S. jr.
Dvorak, T.
Powiązania:: https://bibliotekanauki.pl/articles/351890.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: barite ore
barite aggregate
microstructure
optical microscopy
thin sections analysis
X-ray tomography
Opis:: Two different barite ore (barium sulfate BaSO4) specimens from different localizations were tested and described in this paper. Analysis of the microstructure was performed on polished sections, and on thin sections using X-ray microtomography (micro-CT), and optical microscopy (MO). Microtomography allowed obtaining three-dimensional images of the barite aggregate specimens. In the tomograms, the spatial distribution of the other polluting phases, empty space as well as cracks, pores, and voids – that exceeded ten micrometers of diameter-were possible to visualize. Also, the micro-CT allowed distinguishing between minerals of different density, like SiO₂ and BaSO₄. Images obtained and analyzed on thin sections with various methods using the optical microscopy in transmitted light delivered additional information on the aggregate microstructure, i.e. allow for estimation of the different kinds of inclusions (like the different density of the minerals) in the investigated specimens. Above methods, which were used in the tests, completed each another in order to supply a set of information on inclusions’ distribution and to present the important differences of the barite aggregate specimens microstructure.
Źródło:: Archives of Metallurgy and Materials; 2017, 62, 2A; 697-702
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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