Mineralogical study of the kaersutite in the volcanic nodule at Eifel, W. Germany
Some lapilli and bombs occurring in the ash ejecta around Eifel in Germany were investigated by the author and one such contained pitch-black shining crystal-aggregates, which on detailed study were found to contain kaersutite, having a chemical formula obtained by wet chemistiy as: (Si5.,Al2.3) (Al...
Elmentve itt :
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| Dokumentumtípus: | Cikk |
| Megjelent: |
University of Szeged, Department of Mineralogy, Geochemistry and Petrology
Szeged
1979
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| Sorozat: | Acta mineralogica-petrographica
24 No. 1 |
| Kulcsszavak: | Kőzettan, Ásványtan, Földtan |
| Tárgyszavak: | |
| Online Access: | http://acta.bibl.u-szeged.hu/24641 |
| Tartalmi kivonat: | Some lapilli and bombs occurring in the ash ejecta around Eifel in Germany were investigated by the author and one such contained pitch-black shining crystal-aggregates, which on detailed study were found to contain kaersutite, having a chemical formula obtained by wet chemistiy as: (Si5.,Al2.3) (Al0.2Ti„.4Fe3 + 0.5Mn0.01 Mg3.2) (Ca2.0 Na0.6 K0.4 P0.01) (O, OH, F)32.Fe2+ and Fe3 + contents determined by MOSSBAUER were different from chemical data and are in the ratio of 73 : 27. High content of A1203 (3.87—10.84 wt. %) with Tschermak's component ranging from 5.9 to 18.4 mol. p.c. in clino-pyroxenes in the wehrlite and clinopyroxenite inclusions in the volcanics of Eifel region suggest the parent magmas to be alkali-basalt in composition. The chemistry of kaersutite suggests that the crystallization took place in hydrous condition in the lowest part of the crust. |
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| Terjedelem/Fizikai jellemzők: | 19-27 |
| ISSN: | 0365-8066 |