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Your search keyword '"Svetoslav V. Georgiev"' showing total 3 results
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3 results on '"Svetoslav V. Georgiev"'

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

Author

Peter Marchev, A. von Quadt, Irena Peytcheva, Svetoslav V. Georgiev, Piero Manetti, and Christoph A. Heinrich

Subjects
Basalt, geography, primitive magmas, geography.geographical_feature_category, Pluton, source components, Partial melting, Geochemistry, Massif, ankaramites, Eastern Srednogorie arc, geochemistry, Geophysics, Geochemistry and Petrology, Ultramafic rock, Geology, Amphibole, Petrogenesis, Melt inclusions
Abstract

Journal of Petrology, 50 (10), ISSN:0022-3530, ISSN:1460-2415

Published
2009

2. High-K ankaramitic melt inclusions and lavas in the Upper Cretaceous Eastern Srednogorie continental arc, Bulgaria: Implications for the genesis of arc shoshonites

Author

Svetoslav V. Georgiev, Zoltán Zajacz, Piero Manetti, Peter Marchev, Raya Raicheva, Albrecht von Quadt, and Simone Tommasini

Subjects
Basalt, Olivine, Geochemistry, Geology, engineering.material, Continental arc, Geochemistry and Petrology, Magmatism, engineering, Phenocryst, Mafic, Primitive mantle, Petrology, Melt inclusions
Abstract

The Upper Cretaceous Yambol–Burgas region of the Eastern Srednogorie continental arc is characterized by unusually large volumes of mafic shoshonitic and ultra-K magmatism represented by high-Mg cumulitic rocks, and nepheline-normative ankaramites, absarokites and shoshonitic (high-alumina) basalts. The cumulitic rocks consist of phenocrysts of clinopyroxene and olivine (Fo91–85) with inclusions of spinel (Cr#75–78). Olivine high-Fo cores and clinopyroxene host glassy melt inclusions which have nepheline-normative compositions with ankaramitic CaO/Al2O3 ratios (> 1), low SiO2 (47.4–50.0 wt.%), high MgO (7.5–10.8 wt.%), high total alkalis and shoshonitic K2O/Na2O ratios (> 1). Electron microprobe and LA-ICPMS analyses demonstrate that parental magma was a high-Ca primitive mantle melt. Melt inclusions from the less Fo85 rim approach absarokite composition with CaO/Al2O3 ratios

Published
2009

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