Collected Item: “Cretaceous ultrapotassic magmatism from the Sava-Vardar Zone of the Balkans”
Врста публикације
Рад у часопису
Верзија рада
објављена верзија
Језик рада
енглески
Аутор/и (Милан Марковић, Никола Николић)
Kristijan Sokol, Dejan Prelević, Rolf Romer, Milica Božović, Paul van den Bogaard, Elitsa Stefanova, Bojan Kostić, Nenad Čokulov
Наслов рада (Наслов - поднаслов)
Cretaceous ultrapotassic magmatism from the Sava-Vardar Zone of the Balkans
Наслов часописа
Lithos
Година издавања
2020
Сажетак на енглеском језику
Late Cretaceous global plate reorganization associated with the inception of counterclockwise rotation of
Africa relative to Europe initiated in the Balkan region small-volume magmatism of diverse geochemical
signature along the enigmatic Sava-Vardar Zone. We study a Late Cretaceous lamprophyric sill in Ripanj
village near Belgrade to constrain this magmatic episode. The lamprophyre is characterized by high
contents of Na, P, Fe and Al, and low contents of K, Ca and Mg. Its original nature (Na, K, Ca and Mg) is
concealed by intense alteration (albitization of feldspar and partial chloritization of phlogopite) that
erased the ultrapotassic affinity of the rocks and resulted in extremely low K/Na ratios. The recalculated
chemical composition demonstrates that the rocks are ultrapotassic, with K2O and MgO >3 wt % and
K2O/Na2O > 2, and belong to the durbachite-vaugnerite series, i. e., the plutonic equivalents of minettes
and kersantites.
Two phlogopite concentrates gave AreAr ages of 86.80 ± 0.5 Ma and 86.90 ± 0.5 Ma. Our combined
elemental and SreNdePb isotope data (87Sr/86Sr 0.70667e0.70677, 143Nd/144Nd 0.512426e0.512429,
206Pb/204Pb 18.82e19.13, 207Pb/204Pb 15.67e15.68, 208Pb/204Pb 38.92e39.19) for representative lamprophyric
samples suggests magma derivation from a light rare earth elements (LREE) and K enriched,
metasomatized mantle source. The content of LREE of the rocks is enriched, whereas heavy rare earth
elements (HREE) is depleted. Rare earth elements (REE) of the whole rock and REE of diopside all indicate
that garnet was present in their source.
There are two viable and mutually-excluding geodynamic scenarios for the Late Cretaceous magmatism
in the Balkans: (i) If the Sava-Vardar ocean still existed in the Late Cretaceous and was subducted
under the European plate with arc volcanism along the Apuseni-Banat-Timok-Panagyurishte-
Srednjogorje belt, coeval magmatism in the Sava-Vardar Zone occurred in a fore-arc setting, and may
be related to ridge subduction; (ii) If the Mesozoic ocean closed already during the Upper Jurassic or
Lower Cretaceous, the Late Cretaceous volcanism within the Sava-Vardar Zone represents intracontinental
volcanism associated with transtensional tectonics.
Africa relative to Europe initiated in the Balkan region small-volume magmatism of diverse geochemical
signature along the enigmatic Sava-Vardar Zone. We study a Late Cretaceous lamprophyric sill in Ripanj
village near Belgrade to constrain this magmatic episode. The lamprophyre is characterized by high
contents of Na, P, Fe and Al, and low contents of K, Ca and Mg. Its original nature (Na, K, Ca and Mg) is
concealed by intense alteration (albitization of feldspar and partial chloritization of phlogopite) that
erased the ultrapotassic affinity of the rocks and resulted in extremely low K/Na ratios. The recalculated
chemical composition demonstrates that the rocks are ultrapotassic, with K2O and MgO >3 wt % and
K2O/Na2O > 2, and belong to the durbachite-vaugnerite series, i. e., the plutonic equivalents of minettes
and kersantites.
Two phlogopite concentrates gave AreAr ages of 86.80 ± 0.5 Ma and 86.90 ± 0.5 Ma. Our combined
elemental and SreNdePb isotope data (87Sr/86Sr 0.70667e0.70677, 143Nd/144Nd 0.512426e0.512429,
206Pb/204Pb 18.82e19.13, 207Pb/204Pb 15.67e15.68, 208Pb/204Pb 38.92e39.19) for representative lamprophyric
samples suggests magma derivation from a light rare earth elements (LREE) and K enriched,
metasomatized mantle source. The content of LREE of the rocks is enriched, whereas heavy rare earth
elements (HREE) is depleted. Rare earth elements (REE) of the whole rock and REE of diopside all indicate
that garnet was present in their source.
There are two viable and mutually-excluding geodynamic scenarios for the Late Cretaceous magmatism
in the Balkans: (i) If the Sava-Vardar ocean still existed in the Late Cretaceous and was subducted
under the European plate with arc volcanism along the Apuseni-Banat-Timok-Panagyurishte-
Srednjogorje belt, coeval magmatism in the Sava-Vardar Zone occurred in a fore-arc setting, and may
be related to ridge subduction; (ii) If the Mesozoic ocean closed already during the Upper Jurassic or
Lower Cretaceous, the Late Cretaceous volcanism within the Sava-Vardar Zone represents intracontinental
volcanism associated with transtensional tectonics.
Број часописа
105268
ISSN број часописа
0024-4937
Кључне речи на српском (одвојене знаком ", ")
Sava-Vardar zona, metasomatizam omotača, Kredne ultrakalijske stene, Durbachite-vaugnerite serija
Кључне речи на енглеском (одвојене знаком ", ")
Sava-Vardar zone, Mantle metasomatism, Cretaceous ultrapotassic rocks, Durbachite-vaugnerite series, Reconstruction geochemistry
Шира категорија рада према правилнику МПНТ
M20
Ужа категорија рада према правилнику МПНТ
М21а
Степен доступности
Отворени приступ
Лиценца
Creative Commons – Attribution-No Derivative Works 4.0 International
Формат дигиталног објекта
.pdf