Upper cretaceous trachydacites South of Belgrade - a contribution for the knowledge of the andesitic volcanism in the Northern part of the Vardar zone composite terrane
Volcanic rocks are abundant as clasts in Scnonian sediments south of Belgrade, as well as at the north in the Karadjordjevo formation in Southeastern Baőka and in the Central Banat. These rocks are known in the literature as andesites, but because of the size of grains and mostly high alteration the...
Elmentve itt :
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| Dokumentumtípus: | Cikk |
| Megjelent: |
University of Szeged, Department of Mineralogy, Geochemistry and Petrology
Szeged
1999
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| Sorozat: | Acta mineralogica-petrographica
40 |
| Kulcsszavak: | Kőzettan, Ásványtan, Földtan |
| Tárgyszavak: | |
| Online Access: | http://acta.bibl.u-szeged.hu/24879 |
| Tartalmi kivonat: | Volcanic rocks are abundant as clasts in Scnonian sediments south of Belgrade, as well as at the north in the Karadjordjevo formation in Southeastern Baőka and in the Central Banat. These rocks are known in the literature as andesites, but because of the size of grains and mostly high alteration they were not studied yet. An outcrop of andesitic debris-flow deposit interlayered into these sediments was found south of Belgrade and studied. The field and petrographic study reveal a submarine slump of the volcani(epi)clastic debris predominately composed of holo- to hypocrystalline poiphyritic volcanic fragments within the fine-grained volcanogenic and marly matrix. Volcanic rocks display a high sodic alkaline character corresponding to trachydacites, respectively to benmoreites and sodic trachytes while their trace element ratios indicate VA (volcanic arc) affinity. These rocks represent members of the Senonian volcanic activity in the central part of the Vardar zone, i.e. in its northernmost exposed part of the Kopaonik block and ridge unit. Given the abundant occurrences of andesitic clasts in the Senonian Karadjordjevo formation in the base of the Neogene of the Pannonian basin further at north, the existence of a Senonian volcanism related to the subduction and the closure of the western branch of the Vardar ocean became more evident. |
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| Terjedelem/Fizikai jellemzők: | 71-76 |
| ISSN: | 0365-8066 |