. Ivanov, Z. (1983). Aperc u ge¤ neral sur l’e¤ volution ge¤ ologique et struc- turale des Balcanides. In: Livre^guide de l’excursion pour Re¤ union extra- ordinaire de la Socie¤ te¤ Ge¤ ologique de France en Bulgarie. Sofia: Socie¤ te¤ Ge¤ ologique de Bulgarie, Press Universitaire, pp. 3^26. Ivanov, Z. (1988). Aperc u ge¤ neral sur l’e¤ volution ge¤ ologique et structurale du massif des Rhodopes dans le cadre des Balkanides. Bulletin de la Socie¤ te¤ Ge¤ ologique de France, 8, IV, 2, pp. 227^240. Jagoutz, O., Mu« ntener, O., Ulmer, P., Pettke, T., Burg, J. P., Dawood, H. & Hussain, S. (2007). Petrology and mineral chemistry of lower crustal intrusions: the Chilas Complex, Kohistan (NW Pakistan). Journal of Petrology 48, 1895^1953. Jankovic¤ , S. (1997). The Carpatho-Balkanides and adjacent area: a sector of the Tethyan Eurasian metallogenic belt. Mineralium Deposita 32, 426^433. Jenkins, D. M. (1983). Stability and composition relations of calcic amphiboles in ultramafic rocks. Contributions to Mineralogy and Petrology 83, 375^384. Kamenetsky, V. S., Eggins, S. M., Crawford, A. J., Green, D. H., Gasparon, M. & Falloon, T. J. (1998). Calcic melt inclusions in primitive olivine at 438NMAR: evidence for melt^rock reaction/melting involving clinopyroxene-rich lithologies during MORB generation. Earth and Planetary Science Letters 160, 115^132. Kamenov, B., Tarassova, E., Nedialkov, R., Amov, B., Monchev, P. & Mavroudchiev, B. (2000). New radiometric data from Late Cretaceous plutons in the Eastern Srednogorie area, Bulgaria. Geochemistry, Mineralogy and Petrology 37, 13^24. Kawasaki, T. & Ito, E. (1994). An experimental determination of the exchange-reaction of Fe2þ and Mg2þ between olivine and Ca-rich clinopyroxene. American Mineralogist 79, 461^477. Kennedy, A. K., Hart, S. R. & Frey, F. A. (1990). Composition and isotopic constraints on the petrogenesis of alkaline arc lavasc Lihir Island, Papua New Guinea. Journal of Geophysical Researchc Solid Earth and Planets 95, 6929^6942. Kersting, A. B. & Arculus, R. J. (1994). Klyuchevskoy volcano, Kamchatka, Russiacthe role of high-flux recharged, tapped, and fractionated magma chamber(s) in the genesis of high-Al2O3 from high-MgO basalt. Journal of Petrology 35, 1^41. Kogiso,T. & Hirschmann, M. M. (2001). Experimental study of clinopyroxenite partial melting and the origin of ultra-calcic melt inclusions. Contributions to Mineralogy and Petrology 142, 347^360. Kouzmanov, K., Moritz, R., von Quadt, A., Chiaradia, M., Peytcheva, I., Fontignie, D., Ramboz, C. & Bogdanov, K. (2009). Late Cretaceous porphyry Cu and epithermal Cu^Au association in the Southern Panagyurishte District, Bulgaria: the paired VlaykovVruh and Elshitsa deposits. Mineralium Deposita doi:10,1007/

Origin of Nepheline-normative High-K Ankaramites and the Evolution of Eastern Srednogorie Arc in SE Europe

Element enrichment and provenance of the detrital component in Holocene sediments from the western Black Sea

The main goal of the present study is the characterization of the mineralogical and geochemical features of polymetallic (Mn- and Fe-bearing) nodules, lens- and layer-like bodies from different localities in the central part of the Late Cretaceous Srednogorie metallogenic zone, Bulgaria. The research is based on field studies, sampling and optical microscopy, followed by a combination of analytical techniques: XRD, SEM-EDS, ICP-OES and LA-ICP-MS methods. They define pyrolusite as the main ore mineral of the studied occurrences, while manganite, todorokite, bixbyite, sarkinite, hematite and hauerite are rarer. The most common gangue minerals are quartz, calcite and zeolites. Based on the MnO/SiO2 ratio, the established minerals are divided into two groups: manganese (i) and silica-manganese (ii) phases, respectively. Their trace element composition is dominated by a high content of V, Zn, Mo, W, Co, Ni, Cu, As, Tl and Sr, whereas some of them belong to the group of the critical raw materials for high-tech products. The measured values for Y and rare earth elements of the studied oxides and hydroxides are low compared to their concentrations in modern polymetallic nodules of the Pacific Ocean. Chondrite-normalized patterns indicated weak LREE enrichment with respect to MREEs and HREEs, which are slightly depleted. Common weak to strong negative Ce anomaly, accompanied by various Sm and Eu anomalies, is also observed. The close proximity of the Late Cretaceous volcanic rocks to the Mn- and Fe-bearing ore mineralization and some structural and textural features of the studied minerals suggest hydrothermal origin of the main Mn-Fe ore occurrences in the Panagyurishte area.

New data on the geochemical and mineralogical features of the main manganese- and iron-bearing ore occurrences in the Central Srednogorie Zone, Bulgaria

https://www.geomar.de/fileadmin/personal/fb1/p-oz/mfrank/Peytcheva_et_al_2008.pdf

Combining trace-element compositions, U–Pb geochronology and Hf isotopes in zircons to unravel complex calcalkaline magma chambers in the Upper Cretaceous Srednogorie zone (Bulgaria)

The Zidarovo ore field is situated 15-20 km south from the town of Bourgas. The region consists of Senonian volcanic, intrusive and sedimentary rocks. The syn-/postmagmatic hydrothermal activity was responsible for the formation of polymetallic and gold-polymetallic ore veins in the volcanic rocks. The ore mineralisation is developed in two sectors - Kanarata in the central part (close to the Zidarovo intrusive) and Yurta in the NNW part of the ore field. The composition of the volcanic rocks of the Zidarovo ore field varies from basaltic to trachy-andesitic. The sub-volcanic dyke complex has basaltic and trachy-basaltic composition, and the intrusive rocks are gabbroic to monzo-dioritic. The rock varieties belong to the high-K calc-alkaline magmatic series. Indicative bivariate diagrams as Nb vs. Y, Rb vs. (Y+Nb), Rb vs. (Yb+Ta) and Zr/Al 2 O 3 vs. TiO 2 /Al 2 O 3 define volcanic-arc tectonic environment of their formation. MORB normalized trace elements patterns of the magmatic rocks (enrichment of large ion lithophile elements and low values for high field strength elements, the strong negative Ta and Nb anomaly and the chondrite-normalized REE distribution of the basaltic rocks indicate subduction related magma affinity. Nd and Sr whole rock isotope data are in agreement with this conclusion revealing mantle-crustal signatures with e-Nd (80 Ma) values generally between +2.1 and +3.0 and initial strontium ratios in the narrow range 0.704-0.705. Compared with the data for the Central Srednogorie the magmatic rocks from the Zidarovo ore field are less crustal contaminated. The same trend is observed comparing intrusive and volcanic varieties - the volcanic rocks reveal more primitive isotope composition, which is explained by the faster cooling of the volcanites, probably prior to contamination with crustal materials in middle/upper crustal chambers.

http://www.mgu.bg/sessions/06/1/kr_ak_ip_sg_ss_sst.pdf

Geochemical and sr-nd isotope constraints on the late cretaceous magmatism in the area of the zidarovo ore field

Spatial distribution of the geochemical associations in the Babyak Mo-Ag-Au-W-Bi-base metal deposit, Western Rhodopes (Bulgaria): application of factor analysis

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Geochemical and sr-nd isotope constraints on the late cretaceous magmatism in the area of the zidarovo ore field

Spatial distribution of the geochemical associations in the Babyak Mo-Ag-Au-W-Bi-base metal deposit, Western Rhodopes (Bulgaria): application of factor analysis