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Mineral-melt-fluid composition of carbonate-bearing cumulate xenoliths in Tertiary alkali basalts of southern Slovakia

Published online by Cambridge University Press:  05 July 2018

V. Hurai ,
M. Huraiová ,
P. Konečný  and
R. Thomas
V. Hurai*
Affiliation:
Geological Institute, Slovak Academy of Sciences, 840 05 Bratislava, Slovakia
M. Huraiová
Affiliation:
Department of Mineralogy and Petrology, Comenius University, 842 15 Bratislava, Slovakia
P. Konečný
Affiliation:
Geological Survey of Slovakia, Mlynská dolina, 817 04 Bratislava, Slovakia
R. Thomas
Affiliation:
GeoforschungsZentrum, Telegrafenberg A51, 14473 Potsdam, Germany
*
E-mail: mail: [email protected]
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Abstract

Two types of carbonatic cumulate xenoliths occur in alkali basalts of the northern part of the Carpatho-Pannonian region, Central Europe. One is dominated by Ca-Fe-Mg carbonates with randomly distributed bisulphide globules (Fe1+xS2, x = 0–0.1), Mg-Al spinel, augite, rhönite, Ni-Co-rich chalcopyrite, and a Fe(Ni,Fe)2S4 phase. The second, carbonatic pyroxenite xenolith type, is composed of diopside, subordinate fluorapatite, interstitial Fe-Mg carbonates, and accessory K-pargasite, F-Al-rich ferroan phlogopite, Mg-Al spinel, albite and K-feldspar. All accessory minerals occur in ultrapotassic dacite-trachydacite glass in primary silicate melt inclusions in diopside, together with calcio-carbonatite and CO2-N2-CO inclusions. Textural evidence is provided for multiphase fluid-melt immiscibility in both xenolith types. The carbonatic pyroxenite type is inferred to have accumulated from differentiated, volatile-rich, ultrapotassic magma derived by a very low-degree partial melting of strongly metasomatized mantle. Mineral indicators point to a genetic link between the carbonatite xenolith with olivine-fractionated, silica-undersaturated alkalic basalt ponded at the mantle-crust boundary.

Keywords

carbonatiterhönitepotassic pargasitebisulphide meltCarpathians
Type
Research Article
Information
Mineralogical Magazine , Volume 71 , Issue 1 , February 2007 , pp. 63 - 79
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2007

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