Sapphires related to alkali basalts from the Cerova Highlands, Western Carpathians (southern Slovakia) : composition and origin
Uher, P.
/Giuliani, Gaston
Szakall, S.
Fallick, A.
Strunga, V.
Vaculovic, T.
Ozdin, D.
Greganova, M.
Western Carpathians
Slovakia
Hajnacka
Gortva
CL
LA-ICP-MS
EMPA
oxygen isotopes
placer
alkali basalts
anorthoclasite xenolith
corundum
sapphire
Blue, grey-pink and pink sapphires from the Cerova Highlands, Western Carpathians (southern Slovakia) have been studied using CL, LA-ICP-MS, EMPA, and oxygen isotope methods. The sapphire occurs as (1) elastic heavy mineral in the secondary sandy filling of a Pliocene alkali basaltic maar at Hajnacka, and (2) crystals in a pyroxene-bearing syenite/anorthoclasite xenolith of Pleistocene alkali basalt near Gortva. Critical evaluation of compositional diagrams (Fe, Ti, Cr, Ga, Mg contents, Fe/Ti, Cr/Ga, Ga/Mg ratios) suggests a magmatic origin for elastic blue sapphires with lower Cr and Mg, but higher Fe and Ti concentrations in comparison to the grey-pink and pink varietes, as well as similar compositional trends with blue sapphire from the Gortva magmatic xenolith. Moreover, blue sapphires show similar delta O-18 values: 5.1 parts per thousand in the Gortva xenolith, 3.8 and 5.85 parts per thousand in the Hajnacka placer, closely comparable to mantle to lower crustal magmatic rocks. On the contrary, pink and grey-pink sapphires show higher Cr and Mg, but lower Fe and Ti contents and their composition points to a metamorphic (metasomatic) origin.
2012
text
https://www.documentation.ird.fr/hor/fdi:010055733
oai:ird.fr:fdi:010055733
Uher P., Giuliani Gaston, Szakall S., Fallick A., Strunga V., Vaculovic T., Ozdin D., Greganova M.. Sapphires related to alkali basalts from the Cerova Highlands, Western Carpathians (southern Slovakia) : composition and origin. 2012, 63 (1), 71-82
EN
SLOVAQUE REPUBLIQUE