Journal: Review of the Bulgarian Geological Society

Abbreviation

Rev Bulg Geol Soc

Publisher

Bălgarsko Geologičesko Družestvo

Journal Volumes

ISSN

0007-3938

Description

Filters

20222
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Publications 1 - 2 of 2
  • Timing of pegmatite emplacement and skarn formation in the Malyovitsa Unit, NW Rila: evidence from zonal grossular crystals
    Item type: Journal Article
    Vassileva, Rossitsa D.; Petrussenko, Svetoslav; Grozdev, Valentin; et al. (2022)
    Review of the Bulgarian Geological Society
    Contact Ca-skarns are formed in the marbles of the Malyovitsa Lithotectonic Unit as a result of emplacement of crosscutting pegmatite injections in the area of the Dzhendemski Ezera, NW Rila Mt. Large (up to 4 cm), well-shaped garnet crystals dominate the mineral association with additional vesuvianite, diopside, scapolite and zoisite. Garnets were selected for mineralogical, geochemical and U-Pb geochronological study. Their crystals show clear zonal pattern due Ga, Ge and Y, REE, HFSE, U. Results from the in-situ U-Pb dating of the studied skarn materials suggest the timing of pegmatite intrusion onto the metamorphic rocks and marble-hosted skarn formation at 58.37 +/- 0.70 Ma.
  • Late Permian high-pressure metamorphism in the Devesil Unit, East Rhodopes (SE Bulgaria) - Single or multiple metamorphic events
    Item type: Journal Article
    Macheva, Lyubomirka; Machev, Philip; Peytcheva, Irena; et al. (2022)
    Review of the Bulgarian Geological Society
    Metaeclogites from the Devesil Unit, East Rhodopes are studied. Well preserved eclogite paragenesis is presented by omphacite+garnet+rutile and is obliterated by still high temperature retrograde assemblage of newly formed garnet, diopside, amphibole, plagioclase, titanite, and quartz. The P-T conditions of the high pressure metamor-phism are in the range 620-665 degrees C and 1.8-2.0 GPa, whereas the retrograde stage occurs at temperature 600-650 degrees C and pressure 0.6-0,8 GPa. Cathodoluminescence images and LA-ICP-MS dating of zircon grains point to multiple metamorphic origin of the mineral the earliest with Late Permian-Early Triassic age, followed by Early Jurassic and Early Cretaceous metamorphic events.
Publications 1 - 2 of 2