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Origin and geodynamics significance of Tertiary postcollisional basaltic magmatism in Serbia (central Balkan Peninsula). (Articolo in rivista)
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- Origin and geodynamics significance of Tertiary postcollisional basaltic magmatism in Serbia (central Balkan Peninsula). (Articolo in rivista) (literal)
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- 2004-01-01T00:00:00+01:00 (literal)
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Cvetkovic V., Prelevic D., Downes H., Jovanovic M., Vaselli O., Zècskay Z. (2004)
Origin and geodynamics significance of Tertiary postcollisional basaltic magmatism in Serbia (central Balkan Peninsula).
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- Cvetkovic V., Prelevic D., Downes H., Jovanovic M., Vaselli O., Zècskay Z. (literal)
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- Origin and geodynamics significance of Tertiary postcollisional basaltic magmatism in Serbia (central Balkan Peninsula). (literal)
- Abstract
- Tertiary basaltic magmatism in Serbia occurred through three episodes: (i) Paleocene/Eocene, when mostly east Serbian mafic alkaline rocks (ESPEMAR) formed, (ii) Oligocene/Miocene, dominated by high-K calcalkaline basalts, shoshonites (HKCASHO) and ultrapotassic (UP) rocks, and (iii) Pliocene episode when rocks similar to (ii) originated. In this study, the geodynamics inferred from petrogenesis of the (i) and (ii) episodes are discussed.
The ESPEMAR (6239 Ma) occur mainly as mantle xenolith-bearing basanites. Their geochemical features, such as the REE patterns, elevated HFSE contents and depleted SrNd isotope signatures, indicate a relatively small degree of melting of an isotopically depleted mantle source. Their mantle-normalized trace element patterns are flat to concave and bell-shaped, characteristic of an OIB source free of subduction component. 87Sr/86Sri and 143Nd/144Ndi isotope ratios (0.70300.7047 and 0.51270.5129, respectively) indicate a depleted source for the ESPEMAR similar to the European Asthenospheric Reservoir (EAR).
The HKCASHO rocks (3021 Ma) occur as basalts, basaltic andesites and trachyandesites. They show enrichment in LILE and depletion in HFSE with all the distinctive features of calcalkaline arc-type magmatism. This is coupled with somewhat enriched SrNd isotope signature (87Sr/86Sri=0.70470.7064, 143Nd/144Ndi=0.51240.5126). All these features are characteristic of subduction-related metasomatism and fluxing of the HKCASHO mantle source with fluids/melts released from subducted sedimentary material.
UP rocks (3521 Ma) appear as (i) Si-rich lamproites and related rocks and (ii) olivine leucitites and related rocks. UP rocks have high-LILE/HFSE ratios with enrichment for some LILE around 1000× primitive mantle, troughs at Nb and Ti, and peaks of Pb in their mantle-normalized patterns. They also show highly fractionated REE patterns (La/Yb up to 27, LaN up to 400). The isotopic ratios approach crustal values (87Sr/86Sri=0.70590.7115 and 143Nd/144Ndi=0.51220.5126), and that signature is typical for ultrapotassic rocks worldwide.
The Paleocene/Eocene episode and formation of the ESPEMAR is referred to as asthenospheric-derived magmatism. This magmatism originated through passive riftlike structures related to possible short relaxational phases during predominantly collisional and compressional conditions. The Oligocene/Miocene episode and formation of HKCASHO and UP rocks were dominated by lithospheric-controlled magmatism. Its origin is connected with the activity of a wide dextral wrench corridor generated along the axis of the Dinaride orogen which collapsed in response to thickened crust caused by earlier compressional processes.
To explain conditions of these two magmatic events, a three-stage geodynamic model has been proposed: (1) subductiontermination/collision stage (Paleocene/Eocene), (2) collision stage (Eocene) and (3) postcollision/collapse stage (Oligocene/early Miocene). (literal)
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