Publications des scientifiques de l'IRD

Uher P., Giuliani Gaston, Szakall S., Fallick A., Strunga V., Vaculovic T., Ozdin D., Greganova M. (2012). Sapphires related to alkali basalts from the Cerova Highlands, Western Carpathians (southern Slovakia) : composition and origin. Geologica Carpathica, 63 (1), p. 71-82. ISSN 1335-0552.

Titre du document
Sapphires related to alkali basalts from the Cerova Highlands, Western Carpathians (southern Slovakia) : composition and origin
Année de publication
2012
Type de document
Article référencé dans le Web of Science WOS:000301748900005
Auteurs
Uher P., Giuliani Gaston, Szakall S., Fallick A., Strunga V., Vaculovic T., Ozdin D., Greganova M.
Source
Geologica Carpathica, 2012, 63 (1), p. 71-82 ISSN 1335-0552
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.
Plan de classement
Géologie et formations superficielles [064]
Description Géographique
SLOVAQUE REPUBLIQUE
Localisation
Fonds IRD [F B010055733]
Identifiant IRD
fdi:010055733
Contact