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ZIRCON IN HERCYNIAN GRANITIC PEGMATITES OF THE WESTERN CARPATHIANS, SLOVAKIA

In: Geologica Carpathica, vol. 49, no. 4
Pavel Uher - Petr Cerny
Detaily:
Rok, strany: 1998, 261 - 270
O článku:
Zircon is an uncommon but widespread accessory mineral in Hercynian barren to beryl-columbite rare-element granitic pegmatites of the Central Western Carpathians, Slovakia. BSE images show either homogeneous composition, or irregular to oscillatory zoning, and locally also two-stage crystal growth. Electron-microprobe analysis reveals elevated Hf, locally also P, Y, REE, Al, Fe and Ca. Hafnium content and Zr/Hf ratio are proportional to the fractionation degree of the host pegmatite; zircon from the barren pegmatites attains 1 to 8 wt. % HfO2 (average 3 wt. %), zircon from the beryl-columbite pegmatites contains 2 to 22 wt. % HfO2 (average 7 wt. %). HfZr-1, Al3+P5+Si4+-2 and (Y,HREE,Fe)3+P5+(Zr,Hf)4+-1Si4+-1 are the possible substitution mechanisms. Calculation of the temperature of zircon saturation gave TS ≈ 700 to 580 °C, which corresponds to a primary magmatic origin of the zircon.
Ako citovať:
ISO 690:
Uher, P., Cerny, P. 1998. ZIRCON IN HERCYNIAN GRANITIC PEGMATITES OF THE WESTERN CARPATHIANS, SLOVAKIA. In Geologica Carpathica, vol. 49, no.4, pp. 261-270. 1335-0552.

APA:
Uher, P., Cerny, P. (1998). ZIRCON IN HERCYNIAN GRANITIC PEGMATITES OF THE WESTERN CARPATHIANS, SLOVAKIA. Geologica Carpathica, 49(4), 261-270. 1335-0552.