Chemical characterization of garnets and P-T conditions of metamorphism of the Triassic rocks occurring to the south of Oreschnik, South-East Bulgaria.

Author: Nikoleta, Published:

garnet_9_2

Tzankova, N. 2005. Chemical characterization of garnets and P-T conditions of metamorphism of the Triassic rocks occurring to the south of Oreschnik, South-East Bulgaria. – Ann. Univ. Min. Geol., 48, 1, Geol., 155-160.

 

Abstract. This study provides data about the chemical composition of garnet and associated minerals from the quartz-mica schists occurring to the south of the village Oreschnik, Sakar Mountain, and constrains the P-T conditions of metamorphism. The chemical composition of the following minerals has been studied by electron microprobe: garnet, biotite, staurolite, white mica, chlorite, plagioclase. The metamorphic grade is of lower amphibolite facies. The P-T estimate  for a staurolite-garnet-white mica-biotite-chlorite-plagioclase  schist is T = 6160 C, σ (T) = 21 and P = 7,8 kbar, σ (P) = 1.3.

 

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