Clinopyroxene zoning patterns in the young alkali basalts of Hungary and their petrogenetic significance

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Abstract

In the Upper Pliocene, during the final phase of igneous activity within the Pannonian Basin, alkali basalts were erupted. Their occurrences are restricted to two main regions in Hungary: 1) Transdanubia; 2) Nógrád County. The clinopyroxene phenocrysts of these rocks are zoned titanaugites which often have distinctive colourless or green cores. Two kinds of green cores can be distinguished: 1. olive-green cores (fassaitic augite and fassaite), and 2. grassgreen cores (salite and ferrosalite). Both types of green cores are comparatively iron-rich and they occur only in the basalts of Nógrád County. The olive-green fassaites probably precipitated from relatively evolved melts which have been mixed into their present host magmas, whereas the grassgreen salites and ferrosalites are xenocrysts derived probably from upper mantle rocks. The clinopyroxene zoning patterns suggest, that after being generated by small-degree partial melting in the mantle the Transdanubian basalts ascended to the surface with little or no modification en route, whereas those of Nógrád County had a more complex evolution, in which fractionation at depth and magma mixing played an important role.

Original languageEnglish
Pages (from-to)112-121
Number of pages10
JournalContributions to Mineralogy and Petrology
Volume101
Issue number1
DOIs
Publication statusPublished - Jan 1989

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Hungary
Zoning
alkali basalt
Alkalies
basalt
clinopyroxene
zoning
alkalies
augite
Rocks
rock
partial melting
upper mantle
Pliocene
fractionation
magma
melt
Fractionation
mantle
Earth mantle

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

Cite this

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abstract = "In the Upper Pliocene, during the final phase of igneous activity within the Pannonian Basin, alkali basalts were erupted. Their occurrences are restricted to two main regions in Hungary: 1) Transdanubia; 2) N{\'o}gr{\'a}d County. The clinopyroxene phenocrysts of these rocks are zoned titanaugites which often have distinctive colourless or green cores. Two kinds of green cores can be distinguished: 1. olive-green cores (fassaitic augite and fassaite), and 2. grassgreen cores (salite and ferrosalite). Both types of green cores are comparatively iron-rich and they occur only in the basalts of N{\'o}gr{\'a}d County. The olive-green fassaites probably precipitated from relatively evolved melts which have been mixed into their present host magmas, whereas the grassgreen salites and ferrosalites are xenocrysts derived probably from upper mantle rocks. The clinopyroxene zoning patterns suggest, that after being generated by small-degree partial melting in the mantle the Transdanubian basalts ascended to the surface with little or no modification en route, whereas those of N{\'o}gr{\'a}d County had a more complex evolution, in which fractionation at depth and magma mixing played an important role.",
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AB - In the Upper Pliocene, during the final phase of igneous activity within the Pannonian Basin, alkali basalts were erupted. Their occurrences are restricted to two main regions in Hungary: 1) Transdanubia; 2) Nógrád County. The clinopyroxene phenocrysts of these rocks are zoned titanaugites which often have distinctive colourless or green cores. Two kinds of green cores can be distinguished: 1. olive-green cores (fassaitic augite and fassaite), and 2. grassgreen cores (salite and ferrosalite). Both types of green cores are comparatively iron-rich and they occur only in the basalts of Nógrád County. The olive-green fassaites probably precipitated from relatively evolved melts which have been mixed into their present host magmas, whereas the grassgreen salites and ferrosalites are xenocrysts derived probably from upper mantle rocks. The clinopyroxene zoning patterns suggest, that after being generated by small-degree partial melting in the mantle the Transdanubian basalts ascended to the surface with little or no modification en route, whereas those of Nógrád County had a more complex evolution, in which fractionation at depth and magma mixing played an important role.

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