The thermal behaviour of some feldspars from Egypt
A new and sensitive Hungarian derivatograph is used in studying the thermal behaviour of six feldspars from Egypt and U.S.A., its temperature range is up till 1200 °C. Four endothermic peaks could be noted in the dta curves of the studied feldspars. These are: PI at 225—330 °C, P2 at 425—600 °C, P3...
Elmentve itt :
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| Dokumentumtípus: | Cikk |
| Megjelent: |
University of Szeged, Department of Mineralogy, Geochemistry and Petrology
Szeged
1991
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| Sorozat: | Acta mineralogica-petrographica
32 |
| Kulcsszavak: | Kőzettan, Ásványtan, Földtan |
| Tárgyszavak: | |
| Online Access: | http://acta.bibl.u-szeged.hu/24792 |
| Tartalmi kivonat: | A new and sensitive Hungarian derivatograph is used in studying the thermal behaviour of six feldspars from Egypt and U.S.A., its temperature range is up till 1200 °C. Four endothermic peaks could be noted in the dta curves of the studied feldspars. These are: PI at 225—330 °C, P2 at 425—600 °C, P3 at 695—860 °C and P4 at 940—980 °C. The first peak PI is partly correlated with loss of adsorbed water and partly with loss of constitutional water of certain hydrated silicate minerals like clays present as aiteratic n product of feldspar. This peak can express the extent of alteration of the feldspar. The second peak P2 is shown to be correlated with the miscibility of the two feldspars forming the perthite or antiperthite under study. Moreover, it is shown to be empirically correlated with temperature of formation. The third and fourth peaks P3 and P4 are transition temperatures of plagioclase and microline to the high temperature forms respectively. The last two reaction temperatures are particularly useful as petrogenetic indicators. |
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| Terjedelem/Fizikai jellemzők: | 49-57 |
| ISSN: | 0365-8066 |