Search Results - "Grozdev, Valentin"

U-Pb geochronology of pegmatites from the Rhodope Metamorphic Complex.

Authors: Grozdev, Valentin Vassileva, Rossitsa D. Georgieva, Sylvina

Source: Review of the Bulgarian Geological Society. 2025, Vol. 86 Issue 1, p13-38. 26p.

Subjects: Pegmatites, Zircon, Titanates, Cenozoic Era, Mineralogical chemistry, Radioactive dating

Geographic Terms: Rhodope Mountains

Trace elements in feldspars from Ossogovo Mountain region: Indicators of geological processes and possible critical raw materials.

Alternate Title: Елементи-следи във фелдшпати от района на планината Осогово: индикатори на геоложки процеси и възможни критични суровини

Authors: Grozdev, Valentin Peytcheva, Irena Vassileva, Rossitsa D. et al.

Source: Review of the Bulgarian Geological Society. 2024, Vol. 85 Issue 2, p167-170. 4p.

Subjects: Crust of the earth, Hydrothermal alteration, Feldspar, Plagioclase, Raw materials, Trace elements

Pegmatites from western Rhodope Mts.: zircon data.

Alternate Title: Пегматити от Западни Родопи: цирконови данни.

Authors: Grozdev, Valentin Vassileva, Rossitsa D. Georgieva, Sylvina

Source: Review of the Bulgarian Geological Society. 2023, Vol. 84 Issue 3, p101-104. 4p.

Subjects: Pegmatites, Zircon, Metamorphic rocks, Geological time scales, Andesite

The rare earth elements in zircons as pathfinder of geological events.

Alternate Title: Редкоземните елементи в циркони като индикатор за разчитане на геоложки събития

Authors: Grozdev, Valentin Vassileva, Rossitsa Peytcheva, Irena

Source: Review of the Bulgarian Geological Society. 2022, Vol. 83 Issue 3, p93-96. 4p.

Subjects: Internal structure of the Earth, Geological time scales, Zircon, Surface of the earth, Zircon analysis, Rare earth metals

Geographic Terms: Bulgaria

Andradite from Pb-Zn Djurkovo deposit, Central Rhodopes: chemical composition and U/Pb dating.

Alternate Title: Андрадит от Pb-Zn находище Джурково, Централни Родопи: химичен състав и възрастови U/Pb определения.

Authors: Vassileva, Rossitsa D. Grozdev, Valentin Peytcheva, Irena et al.

Source: Proceedings of the Bulgarian Geological Society. 2020, Vol. 81 Issue 3, p58-60. 3p.

U-Pb garnet geochronology of grossular-diopside skarns from the Central Pirin batholith.

Alternate Title: U-Pb геохронология по гранат на гросулар-диопсидови скарни от Централнопиринския батолит

Authors: Vassileva, Rossitsa D. Grozdev, Valentin Peytcheva, Irena et al.

Source: Proceedings of the Bulgarian Geological Society. 2019, Vol. 80 Issue 3, p88-90. 3p.

U-Pb dating and chemical composition of garnets from the southern parts of Srednogorie zone.

Alternate Title: U-Pb датиране и химичен състав на гранати от южната част на Средногорската зона

Authors: Grozdev, Valentin Vassileva, Rossitsa Peytcheva, Irena et al.

Source: Proceedings of the Bulgarian Geological Society. 2019, Vol. 80 Issue 3, p69-71. 3p.

Celsian from Ca-skarns associated with the Teshevo pluton, SW Bulgaria.

Authors: Vassileva, Rossitsa D. Georgieva, Sylvina Grozdev, Valentin et al.

Source: Review of the Bulgarian Geological Society. 2025, Vol. 86 Issue 2, p83-88. 6p.

Subjects: Skarn, Metasomatism, Minerals, Diopside, Igneous intrusions, Aluminum silicates

Geographic Terms: Bulgaria

Mineral composition and trace element characteristics of pegmatites from Smilovene, Sredna Gora Mountain, Bulgaria.

Alternate Title: Минерален състав и съдържание на елементи-примеси в пегматити от Смиловене, Средна гора, България

Authors: Georgieva, Sylvina Vassileva, Rossitsa D. Grozdev, Valentin et al.

Source: Review of the Bulgarian Geological Society. 2024, Vol. 85 Issue 2, p96-99. 4p.

Subjects: Fluorapatite, Sphene, Muscovite, Pegmatites, Uraninite

Geochemistry and geochronology of Ca-garnets from Musomishte village, SW Bulgaria.

Alternate Title: Геохимия и геохронология на калциеви гранати от с. Мусомище, ЮЗ България

Authors: Grozdev, Valentin Vassileva, Rossitsa Peytcheva, Irena et al.

Source: Proceedings of the Bulgarian Geological Society. 2018, Vol. 79 Issue 3, p51-52. 2p.

Grossulars from the skarnified marbles of the Chepinska Unit, Western Rhodopes.

Alternate Title: Гросулари от скарнирани мрамори от Чепинската единица, Западни Родопи

Authors: Vassileva, Rossitsa D. Grozdev, Valentin Peytcheva, Irena et al.

Source: Proceedings of the Bulgarian Geological Society. 2018, Vol. 79 Issue 3, p35-36. 2p.

Redistribution of incompatible elements during hydrothermal alteration of pegmatite from the Djurkovo Pb-Zn deposit, Central Rhodopes.

Alternate Title: Преразпределение на несъвместими елементи при хидротермални изменения на пегматити от Pb-Zn находище Джурково, Централни Родопи.

Authors: Georgieva, Sylvina Vassileva, Rossitsa D. Grozdev, Valentin et al.

Source: Review of the Bulgarian Geological Society. 2023, Vol. 84 Issue 3, p35-38. 4p.

Subjects: Hydrothermal alteration, Oxide minerals, Sphene, Garnet, Pegmatites, Minerals

Chemical composition of sanidine crystals from the Kopriva trachyrhyodacites, Prekolnitsa graben, SW Bulgaria.

Authors: Grozdev, Valentin Vassileva, Rossitsa D.

Source: Proceedings of the Bulgarian Geological Society. 2013, p27-28. 2p.

geochemistry, trace elements, advanced argillic alteration, Chelopech high-sulphidation deposit, Bulgaria.

Authors: Grozdev, Valentin Peytcheva, Irena von Quadt, Albrecht et al.

Source: Proceedings of the Bulgarian Geological Society. 2012, p49-50. 2p.

Timing of pegmatite emplacement and skarn formation in the Malyovitsa Unit, NW Rila: evidence from zonal grossular crystals.

Alternate Title: Възраст на внедряване на пегматити и скарнообразуване в Мальовишката единица, СЗ Рила по данни от зонални гросуларови кристали

Authors: Vassileva, Rossitsa D. Petrussenko, Svetoslav Grozdev, Valentin et al.

Source: Review of the Bulgarian Geological Society. 2022, Vol. 83 Issue 3, p121-124. 4p.

Subjects: Skarn, Minerals, Metamorphic rocks, Crystals, Uranium-lead dating, Geological time scales

Garnet (REE+Y)-bearing mineral association in pegmatite from the Chepino lithotectonic Unit, Western Rhodopes.

Alternate Title: (REE+Y)-съдържаща минерална асоциация на пегматитов гранат от Чепинската литотоектонска единица, Западни Родопи.

Authors: Vassileva, Rossitsa D. Georgieva, Sylvina Cempírek, Jan et al.

Source: Review of the Bulgarian Geological Society. 2023, Vol. 84 Issue 3, p63-66. 4p.

Subjects: Silicate minerals, Minerals, Garnet, Plagioclase, Hydrothermal alteration, Xenotime

Geographic Terms: Bulgaria

Kinematics and time of emplacement of the Upper Allochthon of the Rhodope Metamorphic Complex: evidence from the Rila Mountains, Bulgaria.

Authors: Gorinova, Tsvetelina Georgiev, Neven Cherneva, Zlatka et al.

Source: International Journal of Earth Sciences. Oct2019, Vol. 108 Issue 7, p2129-2152. 24p.

⁴⁰Ar/39Ar and U-Pb ages for а 33.3 Ma supereruptions from Bulgaria: evidence from Eastern Rhodopes and Varna Mn mineralizations (Bulgaria) and Lemnos Island (Greece).

Alternate Title: 40Ar/39Ar и U-Pb възрасти за 33.3 млн. г. суперерупции: доказателства от Източните Родопи, Варненските Mn минерализации (България) и остров Лeмнос (Гърция).

Authors: Marchev, Peter Jicha, Brian Raicheva, Raya et al.

Source: Proceedings of the Bulgarian Geological Society. 2020, Vol. 81 Issue 3, p87-89. 3p.

U/Pb dating and trace element compositions in pegmatite-hosted titanite from the Petrovitsa Pb-Zn deposit, Madan district, South Bulgaria.

Alternate Title: U/Pb датиране и елементи-следи на титанит от пегматити в находище Петровица, Мадански район, Южна България.

Authors: Milenkov, Georgi Vassileva, Rossitsa D. Peytcheva, Irena et al.

Source: Proceedings of the Bulgarian Geological Society. 2020, Vol. 81 Issue 3, p90-92. 3p.

Geochronology of garnet-bearing skarns from the region of Babyak and Galabovo, Western Rhodopes (Bulgaria).

Alternate Title: Геохронология на гранатови скарни от района на Бабяк и Гълъбово, Западни Родопи (България)

Authors: Stavrev, Milen Peytcheva, Irena Hikov, Atanas et al.

Source: Proceedings of the Bulgarian Geological Society. 2019, Vol. 80 Issue 3, p83-85. 3p.