Lamprophyric rocks of the Miocene Borac Eruptive Complex (Central Serbia, Yugoslavia)

V. Cvetkovic, D. Prelevic, Z. Pecskay

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The aim of this study is to emphasize the petrogenetic significance of the lamprophyric rocks of the Borac Eruptive Complex (BEC) in order to explain magma evolution processes. The largest occurrences of these rocks crop out in the northwestern parts of the BEC as hypabyssal bodies, but in some areas they are represented by autobrecciated lava flows as well as resedimented volcanic breccias. These rocks correspond to calc-alkaline phlogopite lamprophyres consisting of diopside (Wo45-49), phlogopite (> 0.5% Cr2O3, Mg⇆ up to 0.86), sanidine (Or54.6-54.9), ± oligoclase, ± altered olivine, ± leucite, apatite and opaque minerals, as well as quartz and zoned plagioclase (An47.3) of xenocrystic origin. K/Ar ages (22.78±0.88 Ma and 22.65±0.89 Ma - phlogopites; 22.72±0.86 Ma - w.r.) show that the hypabyssal lamprophyres of the Borac area formed during the first volcanic phase. These rocks correspond to potassic series (Foley et al. 1987) displaying a high content of K2O, MgO, TiO2, incompatible (Ba, Sr, Zr, Y, Nb, Th and ΣREE) as well as compatible trace elements (Cr, Ni, Co, V and Sc). Their parental melts probably originated within the subcontinental mantle, i.e. by melting of the parts previously enriched by the subduction component.

Original languageEnglish
Pages (from-to)25-41
Number of pages17
JournalActa Geologica Hungarica
Volume43
Issue number1
Publication statusPublished - Jan 1 2000

Keywords

  • Borac
  • Lamprophyric rock
  • Miocene
  • Phlogopite lamprophyre
  • Volcanic succession
  • Volcanoclastic deposits

ASJC Scopus subject areas

  • Geology

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