Metamorphic evolution of garnet-bearing schists from the Mountain Sakar, Southeastern Bulgaria

Author: Nikoleta, Published:

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Tzankova, N., S. Pristavova. 2007. Metamorphic evolution of garnet-bearing schists from the Mountain Sakar, Southeastern Bulgaria. – Comptes rendus de l’Academie bulgare des Sciences, 60, 3, 271-278.

 

Abstract.

Geothermobarometric data, calculated with program Thermocalc about metapelites in the area of the villages Orlov Dol, Hlyabovo, Dervishka Mogila, Oreshnik, and Planinovo give a prograde trend of the synkinematics process.  The latest is characterized with a clear rise of temperature and weak rise up to the entire absence of any changes in the pressure values. A retrograde trend of the metamorphic process and decrease of pressure during the formation of the rims of the synkinematics minerals are established only in the region of Dervishka mogila. Values ranging from 414 to 507°C obtained after the core examination of the mineral pairs and calculated with program GTB are accepted for the beginning of the synkinematics process, and for the periphery, they vary from 536 to 658°C. Data for pressure range from 3,5 to 8 kbar for the cores and from 6,5 to 9 kbar for the rim. The examined rocks from the areas of the villages of Orlov Dol, Hlyabovo and Planinovo, which are situated close to the Sakar granite pluton show similar metamorphic evolution.

 

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