Geochemistry of orthogneisses from the northern part of the Central Rhodope, Bulgaria

  • Cherneva Z
  • Stancheva E
  • Daieva L
  • et al.
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Abstract

The late Jurassic igneous protoliths of the two-mica and leptitoid gneisses in the Central Rhodope Asenitsa unit correspond to a range of metaluminous granodiorite to wide-spread peraluminous leucogranite compositions. Despite the amphibolite facies metamorphic overprint, the major and trace elements distribution of the igneous protoliths are preserved to a significant extent. Systematic geochemical variations display magma fractionation trends The most indicative of the latter are increasing Rb/Sr ratios from 0.1 to 22, decreasing Eu/Eu* values from 0.8 to 0.1, and decreasing Zr/Hf ratios from 40 to 11 towards the most felsic orthogneisses. The whole orthogneiss suite is distinguished by high LILE/HFSE ratios that support crustal dominated and evolved magma source.

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Cherneva, Z., Stancheva, E., Daieva, L.-A., & Voynova, E. (2008). Geochemistry of orthogneisses from the northern part of the Central Rhodope, Bulgaria. Geologica Balcanica, 37(1–2), 61–72. https://doi.org/10.52321/geolbalc.37.1-2.61

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