Hristiana Georgieva

• PhD
• Assistant at Bulgarian Academy of Sciences

The Sredogriv greenschist facies rocks belong to the Western Balkan Zone in northwestern Bulgaria. The low-grade rocks consist of clastic-tuffaceous precursors and presumably olistostromic magmatic bodies. We present U-Pb LA-ICP-MS zircon age constraints for the Sredogriv metaconglomerate, intruding metaalbitophyre and a breccia-conglomerate of the...

The Sredogriv greenschist facies rocks belong to the Western Balkan Zone in northwestern Bulgaria. The low-grade rocks consist of clastic-tuffaceous precursors and presumably olistostromic magmatic bodies. We present U-Pb LA-ICP-MS zircon age constraints for the Sredogriv metaconglomerate, intruding metaalbitophyre and a breccia-conglomerate of the...

White mica (sericite) is one of the most common minerals in the hydrothermal alteration types at the Elatsite deposit. Differences in the mineral chemistry of sericite revealed some characteristics of the hydrothermal fluid environment. Lowest values of phengite component are determined in sericite from quartz-sericitic alteration, while higher phe...

The Elatsite porphyry-copper deposit is one of the largest and well-studied deposits in Bulgaria. The mineralization and hydrothermal alteration are related to Late Cretaceous magmatic activity associated with the Late Alpine evolution of the area. The three of the most common alteration types are K-silicate, K-silicate-sericitic and quartz-sericit...

The petrological and geochemical data for the Sredogriv metamorphics determine protoliths of metaconglomerates and metasandstones with varying clay content and a significant amount of acidic igneous fragments. The geochemistry, geochronology, and mineralogy of these lithic clasts coincide with the exposed in the close vicinity allochthonous Neoprot...

U-Pb detrital zircon geochronology provides middle Permian–earliest Triassic (272–246 Ma) maximum depositional ages for the Zelenigrad and Vranska Formations of the Belogradchik Unit. These ages match the depositional span (305–249 Ma) of the sedimentary successions in the St. Iliya Heights of the Sakar-Strandzha Zone, in addition to their structur...

The skarn alteration is poorly preserved at the Elatsite, restricted to the hornfelses from the East, Southeast and Southern part of the deposit. The rocks are defined as exoskarns, with a mineral composition including garnets, epidote, pyroxene, amphiboles, carbonates, prehnite, quartz, sulphides. The newly formed minerals occur in poorly preserve...

The K-silicate-sericitic alteration is one of the well-preserved hydrothermal alterations at the Elatsite porphyry-copper gold deposit (PCGD). It is observed in all lithological varieties, but shows asymmetric distribution of the secondary products. The alteration is genetically related with the occurrence of the K-silicate and Na-Ca-K-silicate alt...

Nunatak de Castillo is situated in the most northeastern part of Hurd Peninsula, Livingston Island, Antarctica. In this area of the island some well exposed small plutonic bodies are cropped out. They are emplaced into the volcanic sequence, known as Mount Bowles Formation. Nunatac de Castillo is a remnant volcanic structure (volcanic plug) with ty...

The progression of exploitation and new prospection get to the discovery of Na-Ca and transitional Na-Ca-K-silicate alterations (transitional between Na-Ca and K-silicate alteration) in the deeper parts of the Elatsite porphyry copper-gold deposit (PCGD). The study of these new for the deposit alterations reveal the presence of different in morphol...

Epidotes in different rock alterations in Elatsite PCD, Bulgaria

The Elatsite porphyry copper deposit (PCD), part of the Apuseni-Banat-Timok-Srednogorie copper belt, is one of the biggest and well-studied PCDs in Europe. Its ore mineralization is related to the Upper Cretaceous magmatism. A small porphyritic intrusion (Q-monzodiorite to Granodiorite) elongated in E-W direction and many porphyritic dikes are intr...

Keywords: porphyry-copper deposit, K-silicate alterations, biotite, Elatsite. Elatsite porphyry-copper deposit (PCD) is located in the northern parts of Panagyurishte ore region, situated in the Elastite-Chelopech ore field. Defined by its chemical and mineralogical characteristics the Panagyurishte ore region is part of the Apuseni-Banat-Timok-Sre...

Porphyry-copper deposit (PCD) Elatsite is located at 55-65 km east from Sofia and about 6 km south from the nearest town of Etropole. The rocks, outcropping in the deposit are: (1) Lower Paleozoic metamorphic rocks (phyllites and hornfelses at the contact with intrusive rocks) exposed in the south and SE part of the deposit; (2) coarse-grained gran...