Sapphires related to alkali basalts from the Cerová Highlands, Western Carpathians (southern Slovakia): composition and origin - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Geologica Carpathica Year : 2012

Sapphires related to alkali basalts from the Cerová Highlands, Western Carpathians (southern Slovakia): composition and origin

Pavel Uher
  • Function : Author
Sándor Szakáll
  • Function : Author
Anthony Fallick
  • Function : Author
Vladimír Strunga
  • Function : Author
Tomáš Vaculovič
  • Function : Author
Daniel Ozdín
  • Function : Author
Margaréta Gregáňová
  • Function : Author

Abstract

Blue, grey-pink and pink sapphires from the Cerová Highlands, Western Carpathians (southern Slovakia) have been studied using CL, LA-ICP-MS, EMPA, and oxygen isotope methods. The sapphire occurs as (1) clastic heavy mineral in the secondary sandy filling of a Pliocene alkali basaltic maar at Hajnáčka, and (2) crystals in a pyroxenebearing 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 clastic 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 δ18O values: 5.1 ‰ in the Gortva xenolith, 3.8 and 5.85 ‰ in the Hajnáčka 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.

Dates and versions

insu-03619312 , version 1 (25-03-2022)

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Pavel Uher, Gaston Giuliani, Sándor Szakáll, Anthony Fallick, Vladimír Strunga, et al.. Sapphires related to alkali basalts from the Cerová Highlands, Western Carpathians (southern Slovakia): composition and origin. Geologica Carpathica, 2012, 63, pp.71-82. ⟨10.2478/v10096-012-0005-7⟩. ⟨insu-03619312⟩
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