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Jak klasyfikujemy chondryty zwyczajne?

100%
Szyszka M.
Acta Societatis Metheoriticae Polonorum
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2014
|
vol. 5
149-154
EN
Modern systems of classification has been started in XIX century. However the true progress was began at 60’s and 70’s of XX century. In this time was started modern analythic methods such as: chemical, mineralogic and pretrographic analysis. For this progress fostered also a large number of found meteorites from Antarctica. This article will be concerned about a classification of ordinary chondrites. Acquired meteorite from moroccan searchers. Has been examined and classified. The scheme of this works are presented below.
PL
Współczesny system klasyfikacji meteorytów pochodzi z końca XIX w. Prawdziwy rozwój nastąpił dopiero w latach 60 i 70 XX, kiedy pojawiły się nowoczesne metody badawcze, umożliwiające bardziej kompleksowe analizy petrologiczne, zwłaszcza chemiczne. Rozwojowi temu też sprzyjała olbrzymia ilość meteorytów znajdowanych na Antarktydzie. Niniejsza praca przybliży czytelnikowi sposób klasyfikacji meteorytów kamiennych typu chondryty. Materiał jako przykład badawczy posłużył meteoryt kamienny zakupiony w 2012 w Maroku.
2
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Nowy niezbrekcjonowany meteoryt enstatytowy z Algierii

63%
Karwowski Ł., Szyszka M.
Acta Societatis Metheoriticae Polonorum
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2019
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vol. 10
51-61
EN
In this paper, a new mineralogical and chemical data on a new brecciated enstatite are presented. Fe-low enstite is the main pyroxene. Locally small grains of diopside were noted. The rest of silicates are represented by oligoclase and cristobalite. Siliceous glass was also found. The meteorite contains up to11.5 vol.% of Ni-kamacite (up to 6.8 wt.% of Ni and up to 2.9 wt.% of Si). Niningeryt and Cr-rich troilite are the main sulphides. Small amount of graphite forms a bundle-like agregates of fine plate crystals. The classification is still in progres. The new meteorite from Algeria can be an example of unbrecciated enstatite or ungrouped achondrites.
3
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Badania magnetyczne krateru Lonar

51%
Szyszka M., Plado J., Lingadevaru M., Syed H. J.
Acta Societatis Metheoriticae Polonorum
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2018
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vol. 9
145-149
EN
Lonar crater in India, centered at 19.97°N and 76.50°E is relatively young (few tens of thousands years) and, thus, well preserved meteorite impact structure. This 1.88-km-diameter simple structure has been formed into the 66 Ma old Deccan traps. As the target of Lonar is magnetically homogeneous, it is a perfect site to study the effect of relatively small impact event into the magnetic properties of rocks, and the magnetic field. In October 2017, has been performed ground magnetic mapping of Lonar with help of two proton precession magnetometers. The mapping was done in a squared area of about 36 km2 (6´6 km) including the crater depression, rims, and surrounding terrain. Magnetic map (not corrected for latitude) reveals a circular negative anomaly more than 1000 nT in amplitude, which corresponds to the crater depression. The negative anomaly is surrounded by semicircular feature of up to 500 nT positive anomalies that correlate with present rim of the crater. The total diameter of the Lonar magnetic anomalies is about 2.25 km, which is just 20% more compared to the crater rim-to-rim diameter.
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