The main genetic types of spherules occurring in the rocks of Hungary
Four types of spherules obtainable from the sediments and deposits in Hungary are discernible by means of SEM and EDAX study of their chemical composition, textural structure and morphogenetics. Of extraterrestrial origin and of size 100-200 micron are the following: Glassy microtektites (Si), the m...
Elmentve itt :
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| Dokumentumtípus: | Cikk |
| Megjelent: |
University of Szeged, Department of Mineralogy, Geochemistry and Petrology
Szeged
1997
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| Sorozat: | Acta mineralogica-petrographica
38 |
| Kulcsszavak: | Kőzettan, Ásványtan, Földtan |
| Tárgyszavak: | |
| Online Access: | http://acta.bibl.u-szeged.hu/76359 |
| Tartalmi kivonat: | Four types of spherules obtainable from the sediments and deposits in Hungary are discernible by means of SEM and EDAX study of their chemical composition, textural structure and morphogenetics. Of extraterrestrial origin and of size 100-200 micron are the following: Glassy microtektites (Si), the micro magnetospherules (Fe) and the micro siderospherules (Si+Fe); on the other hand of terrestrial origin and size 200—400 micron are the magnetopearls (Fe). The extraterrestric spherules show all the signs of their origin: as the cold meteorites abruptly were heated up in the Earth's atmosphere and then burst up disintegrating into their elements forming blenddrops rich in gases, and slowly cooling down while rotating with high velocity. The tektites of different ages (Triassic, Cretaceous, Miocene) are to be found abundantly in thin clay layers of the deposits. The white and light yellow transparent tektites with low density contain small crystallites while the honey-yellow tektites of high density contain after anorthite oldhamit pseudomorphoses. Both types have blendclothfibres on their surface. The glassy tektites of different ages elements and to their proportions are completely similar to the anorthosite of the Moon's crust. All these facts prove that the material of the glassy tektites comes from the Moon's crust anorthosite minerals by escaping from there during impacts of meteorites and heated up and disintegrated into micro compound droplets when arriving into the Earth's atmosphere. The abundance of tektites in the different layers signals the ages of some big meteorite crashes on the Moon's surface. The morphogenetics of terrestrial magnetopearls signal the process of slow and uniform crystallisation at low temperature. |
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| Terjedelem/Fizikai jellemzők: | 105-118 |
| ISSN: | 0365-8066 |