Dejan Prelević

• PhD
• Professor (Full) at University of Belgrade

The origin of the lithospheric mantle beneath accretionary orogens is enigmatic; although severe compression of the buoyant crust occurs, the mantle lithosphere is generally thought to be removed and returned to the convecting mantle. We suggest that during the accretion of oceanic arcs and small continental blocks in the Mediterranean region, and...

Abstract Tectonically young, orogenic settings are commonly the sites of post-collisional silica-rich ultrapotassic magmas with extreme K2O-contents of up to 9 wt% and K2O/Na2O > 2. Many experimental studies investigating the generation of these melts have concentrated on melting of homogenous phlogopite bearing peridotites, whereas geochemical sig...

The generation of strongly potassic melts in the mantle is generally thought to require the presence of phlogopite in the melting assemblage. In the Mediterranean region, trace element and isotope compositions indicate that continental crustal material is involved in the generation of many potassium-rich lavas. This is clearest in ultrapotassic roc...

The waning stage(s) of the Tethyan ocean(s) in the Balkans are not well understood. Controversy centres on the origin and lifespan of the Cretaceous Sava Zone, which is allegedly a remnant of the last oceanic domain in the Balkan Peninsula, defining the youngest suture between Eurasia-and Adria-derived plates. In order to investigate to what extent...

The Sava-Klepa Massif represents an approximately 5 × 2 km sized fault-bounded block of dominantly basaltic rocks located within the Sava-Zone, an important suture zone between the Eurasian (Europe) and Gondwana (Adria) continental plates in the Balkans. Its nature and tectonic evolution is controversial: It is either interpreted as a remnant of th...

Mantle-derived magmas are traditionally assumed to originate by melting of an upper mantle consisting of uniform spinel- or garnet peridotite dominated by olivine. However, extensive studies of mantle-derived basalts suggest that the mantle is more mineralogically heterogeneous, so that the genesis of even the most common magmas requires considerat...

We provide new insights into the Badenian transgression (Langhian to early Serravallian) in western Serbia, focusing on the marginal part of the Central Paratethys. Nano- and microfossils (calcareous nannofossils, foraminifers, and ostracods) are used along with U–Pb radioisotope dating of a tuff layer near the Badenian lower boundary to reconstruc...

Sediment contribution to the mantle is the key step for the generation of orogenic magmatism to produce its isotopic and geochemical inventory. Even though they are exceptional for the post-collisional settings, there are worldwide examples of arc-related ultrapotassic mafic magmas which require complex multi-stage processes along with sediment mel...

We present a new experimental dataset for reaction experiments between natural amphibole-clinopyroxene metasomes (hornblendite) and synthetic lherzolite that produced Na-rich alkaline melts. Experiments were conducted at 1, 3 and 4 GPa and 1000–1300 °C. The generated melts range from foidite over basanite to phonotephrite. At 1 GPa between 1000 and...

The origin of Italian kamafugites and lamproites is a matter of debate, not least due to their “crustal signature” displayed by trace element compositions and isotopic ratios, but also due to puzzling geodynamic significance. We combine in situ EMPA and LA‐ICP‐MS analyses with in situ analyses of oxygen isotopes (SIMS) on olivine from the Pleistoce...

The high flux of subaerial volcanic CO2 emissions around the circum‐Mediterranean region requires the involvement of an unusually carbon‐rich reservoir, but the origin of which is still unclear. Here, we aim to resolve this problem by analyzing Mg and Zn isotopes for the widely distributed mafic potassic to ultrapotassic lavas in this region. These...

U-Pb geochronology of zircon grains retrieved from magmatic rocks intruding the Jadar block terrane in the central Balkans is used here to add new constraints on the terrane accretion processes and the provenance of crustal sources of this potentially exotic crustal block. Using an unorthodox approach, we analyzed zircons extracted from the product...

Mantle xenoliths from a Pliocene (∼2 Ma) pyroclastic cone of the Jabal Eghei Volcanic Complex (south Libya) are studied for unravelling depletion-, deformation- and metasomatic events within this part of the Saharan Metacraton. The xenoliths are fertile Cpx-rich spinel lherzolites texturally distinguished into protogranular (hereafter: undeformed –...

Magnesium (Mg) and zinc (Zn) isotopes have been applied to trace whether surface carbonates have been recycled into the deep mantle beneath Balkan Peninsula, where a stagnant slab exists in the mantle transition zone. Here we investigate a suite of Cenozoic sodic alkaline basaltic rocks (Na2O/K2O > 1), called the East Serbian Mafic Alkaline Rocks (...

The Menderes Massif in Turkey represents one of the largest metamorphic core complexes in the world. It is regarded as a section of lower continental crust exhumed along low-angle detachment faults in the Late Miocene during a period of extension that affected the entire Aegean province. Syn-extensional magmatic activity within the Menderes metamor...

doi: 10.7185/geochemlet.2123 Post-collisional highly potassic magmatism in large orogenic belts has been taken as evidence for recycling of continent-derived K-rich sediments within the orogenic lithospheric mantle. Potassium isotopes may provide important insights into the origins of K in these magmas, since subducting sediments exhibit much more...

Subduction of oceanic crust buries an average thickness of 300-500 m of sediment that eventually dehydrates or partially melts. Progressive release of fluid/melt metasomatizes the fore-arc mantle, forming serpentinite at low temperatures and phlogopite-bearing pyroxenite where slab surface reaches 700-900 °C. This is sufficiently high to partially...

High-MgO lamproite and lamproite-like (i.e., lamprophyric) ultrapotassic rocks are recurrent in the Mediterranean and surrounding regions. They are associated in space and time with ultrapotassic shoshonites and high-K calc-alkaline rocks. This magmatism is linked with the geodynamic evolution of the westernmost sector of the Alpine-Himalaya collis...

The generation of strongly potassic melts in the mantle requires the presence of phlogopite in the melting assemblage, while isotopic and trace element analyses of ultrapotassic rocks frequently indicate the involvement of subducted crustal lithologies in the source. However, phlogopite-free experiments that focus on melting of sedimentary rocks an...

Lower-Middle Miocene sedimentary succession and the conformable/ unconformable relationships between the lacustrine-continental systems (i.e. DLS, SLS) and Badenian marine transgression represents one of the intrigue topics. Herein, we studied five exploration boreholes (eastern Serbia) and analyzed the main facies pattern, biostratigraphic charact...

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 thi...

Structures at Cer MCC in western central Serbia reveal evidence for Top-N transport during exhumation. Exhumation was active until at least 17 Ma, according to Ar-Ar geochronology an most likely related to reactivation of Maastrichtian suturing thrusts of the Sava Zone as low-angle detachments. Magmatism might be related to upwelling of Adriatic as...

In the subduction zones recycling of the crustal material to the mantle wedge introduce silica-rich components and volatiles to depleted mantle lithologies, which reappear in the arc lavas commonly of andesitic compositions. The silica-undersaturated and extremely K-rich lavas typically do not appear in the active volcanic arc setting and if occur...

Potassium-rich lavas with K/Na of >2 are common in orogenic and anorogenic intraplate magmatic provinces. However, in the primitive mantle, the concentration of Na exceeds that of K by 10 times. The source of K-rich lavas thus needs to be either K-enriched or Na-depleted to account for high K/Na ratios. The geochemical and isotopic compositions of...

The polymetallic Bobija ore deposit in Western Serbia is located at the southwestern edge of the Jadar Block, a distal part of the passive continental margin of Adria. The sulphide mineralization consists of fine-grained pyrite, sphalerite, galena and tetrahedrite, and is associated with abundant barite. The deposit is stratabound and hosted by a T...

The central and northeastern of Turkey were shaped by the transition from collisional to post-collisional tectonics and coeval magmatism during Early Cenozoic. However, the temporal and spatial evolution of the magmatism during the middle Eocene remains elusive. In this paper, we provide petrological, isotopic and radiometric data from two middle E...

The petrology, mineralogy and geochemistry of lawsonite blueschists from the Tavşanlı zone in NW Turkey – one of the best-preserved blueschist terranes in the world – have been comprehensively investigated. The blueschist samples contain lawsonite + sodic amphibole + phengite + chlorite + titanite + apatite ± aragonite ± quartz ± relict igneous pyr...

Leucite-bearing volcanic rocks are commonly found within and around the Mediterranean area. A specific type of this rock group are leucitites. They are found both in a hinterland position of active and fossil subduction systems as well as in foreland tectonic settings, but none have been found in the Maghreb (N Africa) and Mashreq (Middle East) are...

The study reports and synthesizes the available geological and geochemical data on the East Vardar ophiolites comprising most known occurrences from the South Apuseni Mountains in Romania to the tip of the Chalkidiki Pen-insula in Greece. The summarized geological data suggest that the East Vardar ophiolites are mostly composed of the magmatic sequ...

Izmir-Ankara-Erzincan suture zone (IAESZ) and its environs record overlapping subduction and collision stages between the Paleozoic to early Cenozoic and mantle source area along this range have been modified by different fluids and melts during this time interval. At Early Cenozoic (Late Paleocene- Early Eocene), Pontides and Central Anatolian Cry...

In this study, we show how veined lithospheric mantle is involved in the genesis of ultrapotassic magmatism in cratonic settings. We conducted high pressure experiments to simulate vein + wall rock melting within the Earth's lithospheric mantle by reacting assemblages of harzburgite and phlogopite-rich hydrous mantle xenoliths. These comprised a mi...

Middle Eocene magmatic units around NE Turkey (Tokat-Sivas) developed along Cretaceous İzmir-Ankara-Erzincan Tethyan suture zone (IAESZ) at the post collisional stage and is an ideal place to study the development of the melting, assimilation, storage and homogenization processes as well as geodynamic mechanisms in an evolving orogenic belt. Post-c...

Nitrogen, the most abundant element of Earth's atmosphere, is also an important constituent in high pressure fluids, melts and mineral phases. The recycling of surficial nitrogen to mantle depths is thought to be connected to potassium-bearing silicates in subduction zones, whereby micas play an important role. Phlogopite is stable in ultramafic ro...

The northern Aegean region was shaped by subduction, obduction, collision, and post-collisional extension processes. Two areas in this region, the Rhodope-Thrace-Biga Peninsula to the west and Armutlu-Almacık-Nallıhan (the Central Sakarya) to the east, are characterized by extensive Eocene to Miocene post-collisional magmatic associations. We sugge...

Post-collisional Cenozoic magmatic activity in NW Anatolia produced widespread volcanism across the region. In the Biga Peninsula, in the west, medium-K calc-alkaline to ultra-K rocks with orogenic geochemical signature were emplaced at ~ 43–15 Ma (Biga orogenic volcanic rocks; BOVR). Volcanic activity in the Central Sakarya region, to the east, is...

Lithospheric thickness and the heterogeneity of the mantle lithosphere are two major parameters that play a role in determining the final composition of the mafic melts and their minerals. The Songliao basin in northeast China represents an ideal natural laboratory to study the effect of these two parameters on early Pliocene to Holocene K-rich maf...

Previous experimental studies demonstrated that the concept of the melting of phlogopite-or/and amphibole bearing homogeneously metasomatized mantle is unable to fully comprehend most of the geochemical features of lavas with extremely high K2O and K2O/Na2O up to 9 wt% and >> 2, respectively. An alternative scenario is that metasomatic phases are p...

Mica-amphibole-rutile-ilmenite-diopside (MARID) xenoliths are alkali-rich, coarse-grained ultramafic rocks, typically found in mantle-nodules of the cratonic lithosphere. These xenoliths are also known as Glimmerites as they contain >90 wt.% phlogopite. They represent a group of metasomatic mineral assemblages from the lithosphere-asthenosphere bou...

Carboniferous metagranites with U-Pb zircon crystallization ages of 331–315 Ma crop out in the Afyon zone in the northern margin of the Anatolide-Tauride Block, which is commonly regarded as part of Gondwana during the Late Palaeozoic. They are peraluminous, calc-alkaline and are characterized by increase in Rb and Ba, decrease in Nb–Ta, and enrich...

The Geological composition of the Balkan region has been predominantly shaped by the existence of two ophiolite belts originated after the closure of the Tethyan ocean(s) which are the Dinaride-Hellenide ophiolite belt in the south-west and the Vardar belt in the north-east. These two ophiolite belts are either relics of two separate major branches...

Upper Cretaceous volcano-sedimentary successions in the Central Pontides of Turkey, related to the closure of the Tethys Ocean, include a variety of alkaline ultrapotassic igneous rocks that have been classified as leucititic, lamprophyric and trachytic based on their mineral paragenesis. Although the ultrapotassic rocks display a range of K2O cont...

The volcanic products of the late Miocene Morron de Villamayor volcano (Calatrava Volcanic Field, central Spain) are known for being one of the few outcrops of leucitites in the entire circum-Mediterranean area. These rocks are important because aragonite of mantle origin has been reported as inclusion in olivine macrocrysts. We use petrographic ob...

With the development of high-precision electron microprobe and Laser-ICP-MS in-situ analyses, the measurement of low concentration trace elements in olivine is nicely accessible. The trace elements in olivine are used as a new geochemical indicator of mantle partition melting, mantle metasomatism and magma fractionation in recent years. A series of...

The region of South-Eastern Europe (SEE) occupies an important segment of the Alpine–Himalayan collisional orogenic belt and consists of several Phanerozoic mobile belts. The SEE region inherits its geology from the evolution of the Vardar Tethys ocean, which existed in-between the Eurasian (Europe) and Gondwana (Africa) continental plates and whic...

A new high-precision 40Ar/39Ar anorthoclase feldspar age of 176.7±0.5Ma (2-sigma) reveals that small-volume alkaline basaltic magmatism occurred at the rifted SW margin of the Baltic Shield in Scania (southern Sweden), at a time of global plate reorganization associated with the inception of Pangea supercontinent break-up. Our combined elemental an...

Aillikites from the Aillik Bay in Labrador, Canada, define the carbonate-rich end-member of ultramafic lamprophyres (UML). They are characterised by a porphyritic inequigranular texture with phenocrysts of olivine and phlogopite grains major phases, and minor apatite and oxide (magnetite and ilmenite) crystals in a carbonatitic groundmass. The geoc...

10.1016/j.jog.2015.04.002

The origin of K-rich orogenic magmatism in the Alpine-Himalayan belt and its relationship to the large-scale elevations in several massifs of the orogen is controversial, particularly the significance of the widespread presence of a geochemical signal typical for recycled continental crust. Two competing scenarios invoke direct melting of continent...

Geological background: Ultrapotassic lavas are widespread in the Alpine-Himalayan belt. Extreme enrichment in incompatible elements, trace elements and radiogenic isotopes point at indirect crustal contamination of their mantle source, whereas high-forsterite olivine and refractory Cr-spinel phenocrysts suggest their origination from depleted mantl...

Post-collisional mantle-derived magmatism in the Alpine–Himalayan belt is geochemically extremely heterogeneous, but dominantly enriched in potassium. Its origin is controversial, particularly the role of recycled continental crust. In our contribution, we combine the field and geochemical data on the lavas with high-pressure experiments on differe...

No abstract is available for this article.

We used Os isotopic systematics to assess the geochemical relationship between the lithospheric mantle beneath the Balkans (Mediterranean), ophiolitic peridotites and lavas derived from the lithospheric mantle. In our holistic approach we studied samples of Tertiary post-collisional ultrapotassic lavas sourced within the lithospheric mantle, placer...

During convergence of Gondwana-derived microplates and Laurussia in the Palaeozoic, subduction of oceanic and continental crust and their sedimentary cover introduced material of regionally contrasting chemical and isotopic compositions into the mantle. This slab material metasomatized the local mantle, producing a highly heterogeneous lithospheric...

Mica-amphibole-rutile-ilmenite-diopside (MARID) xenoliths are alkali-rich, coarse-grained ultramafic rocks, typical for heavily metasomatized subcontinental lithospheric mantle (Dawson & Smith, 1977). They are produced either by interaction of mantle wall rock with lamproitic melts that percolate through the mantle (Dawson and Smith 1977; Sweeney 1...

The Middle Miocene Afyon alkaline volcanic complex (western Anatolia) erupted lavas of highly variable geochemistry, ranging from silica-undersaturated to silica-oversaturated and from ultrapotassic to Na-alkaline compositions. There are two major volcanic groups showing substantial differences in K-enrichment and different Sr, Nd and Pb isotopic c...

This study presents detailed petrographical and geochemical investigations on remarkably fresh olivines in kimberlites from the EKATI Diamond MineTM located in the Tertiary/Cretaceous Lac de Gras kimberlite field within the Slave craton of Canada.