Morphology and chemical zoning in garnets from Precambrian metamorphic rocks in the rim of Sakar pluton, Southeast Bulgaria

Tzankova, N. Morphology and chemical zoning in garnets from Precambrian metamorphic rocks in the rim of Sakar pluton, Southeast Bulgaria. – C. R. Acad. Bulg. Sci., 58, 7, 775-782.

Abstract

 The aim of this study is to provide data about the morphological characteristics and chemical composition of garnets from the Precambrian metamorphites of the Zhalti Chal Formation in the rim of the Sakar Pluton, Southeast Bulgaria. The garnets which have been studied are from the region of the villages Orlov Dol (along the Sokolitza and Kondus Dere rivers and to the west of Gyoptepe along the road to Madretz), Hlyabovo (along the Golyamata Reka and from the chlorite schists with magnetite) and Dervishka Mogila. The previous name of Golyamata Reka is Yavuz Dere. The predominant form in the garnets from the Precambrian metamorphic rocks in the rim of the Sakar Pluton is rhombododecahedral {110} crystals and combinations of rhombododecahedral {110} crystals with small {211} faces. There are two generations of the garnet – with pre-tectonic and with syntectonic crystallization. The investigated garnets are dominantly with almandine composition and show a variety in the values of the other components. All analyzed garnet porphyroblasts express “normal” chemical zoning.

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