Geochemistry and growth morphology of alkali feldspar crystals from an IAB iron meteorite : insight into possible hypotheses of their crystallization

• Autorzy: Słaby E. , Karwowski Ł. , Majzner K. , Wirth R. , Muszyński A. , Birski Ł. , Simon K. , Domonik A. , Moszumańska I. , Orłowski R.

Identyfikatory

DOI

10.14241/asgp.2017.011

• Języki publikacji: EN

Abstrakty

EN

Alkali feldspar crystals have been recognized in the troilite-graphite nodules of the Morasko IAB iron meteorite. Their chemical, microtextural and structural properties were studied using electron microprobe analysis (EMPA), laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS), transmission electron microscopy (TEM) and Raman spectroscopy. The feldspars occur as perthitic or antiperthitic intergrowths, whereas the albite lamellae are perfectly twinned. The structural properties reveal intergrown phases with fairly disordered patterns. The electron microprobe analyses demonstrate that the intergrown phases are mainly rich in sodium or potassium, resulting in compositions that are close to those of albite or orthoclase. The compositions, calculated on the basis of a segmented perthite-antiperthite image, showed that the Or-to-Ab proportions in the homogenized crystals were almost 0.3:0.7, thus indicating that the anorthoclase crystallized under high-temperature conditions. Two hypotheses of crystal formation could account for these characteristics: crystallization from a melt or from a metasomatic solution. Relics with evidence of metasomatic replacement of former minerals were not found. Accordingly, this work focuses on arguments that support the other hypothesis. Large ion lithophile elements (LILEs, e.g., Ba, Sr, Rb, LREE, Pb, and Ga) were used to track the origin of the crystals. Their concentrations indicate crystallization from a parent melt strongly depleted in LILEs. Alkali feldspar is commonly a product of a highly differentiated melt. However, highly differentiated melts are typically enriched in LILEs, which here is not the case. The melt that crystallized the feldspar cannot be related to impact-induced partial melting of the chondritic material alone. The derived melt probably was contaminated by silica-rich target material during interaction between the IAB projectile and the target material and was accompanied by metal and sulphide melts that were both immiscible with a silicate melt.

Słowa kluczowe

EN

IAB; iron meteorite; alkali feldspar; trace elements; growth texture; perthite; antiperthite; melt contamination; target material

• Wydawca: Polskie Towarzystwo Geologiczne
• Czasopismo: Annales Societatis Geologorum Poloniae
• Rocznik: 2017
• Tom: Vol. 87, No. 2
• Strony: 121--140
• Opis fizyczny: Bibliogr. 79 poz., rys., tab., wykr.

Twórcy

autor

Słaby E.

• Institute of Geological Sciences, Polish Academy of Sciences, Research Centre in Warsaw, Twarda 51/55, 00-818 Warszawa, Poland

autor

Karwowski Ł.

• Faculty of Earth Sciences, University of Silesia, Będzińska 60, 41-200 Sosnowiec, Poland

autor

Majzner K.

• Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Kraków, Poland
• Jagiellonian Centrefor Experimental Therapeutics (JCET), Jagiellonian University, Bobrzyńskiego 14,30-348 Kraków, Poland

autor

Wirth R.

• Helmholtz-Zentrum Potsdam Deutsches GeoForschungs Zentrum GFZ, Telegrafenberg, 14473 Potsdam, Germany GHZ

autor

Muszyński A.

• Institute of Geology, Adam Mickiewicz University, Maków Polnych 16, 61-606 Poznań ,Poland

autor

Birski Ł.

• Institute of Geological Sciences, Polish Academy of Sciences, Research Centre in Warsaw, Twarda 51/55, 00-818 Warszawa, Poland

autor

Simon K.

• Department of Geochemistry, GZG of Georg-August-University, Goldschmidtstrasse 1, 37077 Göettingen, Germany

autor

Domonik A.

• Institute of Hydrogeology and Engineering Geology, University of Warsaw, 02-089 Warszawa, ¯wirki i Wigury 93, Poland

autor

Moszumańska I.

• Institute of Geological Sciences, Polish Academy of Sciences, Research Centre in Warsaw, Twarda 51/55, 00-818 Warszawa, Poland

autor

Orłowski R.

• Institute of Geological Sciences, Polish Academy of Sciences, Research Centre in Warsaw, Twarda 51/55, 00-818 Warszawa, Poland

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Uwagi

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017).