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Descending Vs

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Descending Vs GEOLOŠKI ANALI BALKANSKOGA POLUOSTRVA Volume 80 (2), December 2019, 65–85 – https://doi.org/10.2298/GABP1902065S Original scientific paper Intraoceanic subduction of the Оригинални научни рад northwestern Neotethys and geodynamic interaction with Serbo-Macedonian foreland: Descending vs. overriding near-trench dynamic constraints (East Vardar Zone, Jastrebac Mts., Serbia) 1 2 Arko PAhić iVADAr AUDENyi D S & T G Abstract. A composite paleogeographic and plate kinematic spatiotemporal reconstruction of the exhumed Neotethyan cross-lithospheric footwall amal - gamation (Jastrebac dome) incorporates the two (fio) rmerly underplating oceanic entities, West Vardar- and East Vardar Zone. These ophiolite-bearing agglomerations are unroofevds .within the accretionary Paleogene to Miovcse. ne core-complex, beneath the Serbo-Macedonian overri(diiin) g plate. The exposed Neotethyan crustal amalgamation is comprised of: an folded trench assem - blage of uncertain Mesozoic? Paleogeographic affinity m(eitiai) morphosed under a greenschist-grade (West- East Vardar Zone or Neotethyan crust- its back-arc system?) sandwiched beneath the overlying late Cretaceous – Pa - leogene (meta)turbidites. To make matters more intricate, at the closest proxim - ity of the dome (Mali Jastrebac Mountain) there is a similar greensc hi st-facies amalgamation comprised of the Neoproterozoic – Lower Paleozoic ocean-floor assembly (Supragetic basement). vs The interpretations of this rather controversial cross-lithospheric structure include a reassessment of the obduction sequencves., and are underpinned by Key words: the restoration of the near-trench microplate motions. The study addresses Jastrebac metamorphic complex, the (1) local finite configuration (Serbo-Macedonian hanging wall . Neo - East Vardar Zone, intraoceanic tethyan intraoceanic arc) and the (2) spatiotemporal geometry of the principal subduction, retreating collision, (micro)plate boundaries (Serbo-Macedonian Unit Apulia/Adria). Unlike the west-vergent nappe. earlier proposal of the ophiolite obduction onto the Serbo-Macedonian Unit onto the Apulia/Adria hinterland (or external segment of the “Dacia mega-ter - rane”), we here propose a west-vergent obduction of the East Vardar Zone ophiolites onto the descending Neotethyan lithosphere (West Vardar ophio - lites) - a similar scenario to its continuation in Greece (Peonias subzone). Апстракт . Временско-просторна структурно-геол oшка и палеогеограф - ска реконструкција неотетиског литосферног океанског система на примеру Јастребачког тектонског прозора обједињује два литосферна члана представљених офиолитима мезозојске старости: периферне Источне вардарске зоне (ИВЗ) и главне Западне вардарске зоне (ЗВЗ). Амалгамација две литосферске океанске јединице се одиграла пре сту - пања у конвергентне односе Алпског индентера (Апуљско-јадранск a микроплоч a) и Европског промонторијума тј. од горње јуре до доње кре - де. Овај литосферни агломерат је током, (и после) касноалпске конвер - 1 Geological Survey of Serbia, Rovinjska 12, 11000 Belgrade, Serbia. E-mails: [email protected]; [email protected] 2 Geographical Institute “Jovan Cvijić” of the Serbian Academy of Sciences and Arts, Djure Jakšića 9, 11000 Belgrade, Serbia. 65 DARko SPAhIć & T IVADAR GAuDEnyI генције ексхумиран и раскровљен у виду Јастребачке доме. Ја стребачка дома представља сегмент акретоване коре која се налази унутар нека - дашње маргине Неотетиса тј. у оквиру Српско-македонске јединице (СМЈ). Ексхумација Великојастребачког мезозојског(?) комплек са указује на подински однос према некадашњој Српско-македонској континентал - ној маргини. Великојастребачки поликристаласти стенски комплекс је састављен од: (1) набраних јурских офиолитских асемблажа деформи - саних до фације зелених шкриљаца унутар некадашњег оке анског шава, са још увек нејасним мезозојским палеогеогафским афини тетом ових стена. Изнад наведеног Великојастребачког пакета утврђени су анхиме - таморфни (2) горњокредни до палеогени (мета)турбидити (“сенонски флиш” / “Савска зона”). Даљој стратиграфско-структурно-палеогеограф - ској конфузији јастребачких зелених шкриљаца доприноси сличност са (3) фацијом истог нивоа метаморфизма (Супрагетик), која међутим припада некадашњем океанском асемблажу неопротерозојсreкtоr-eдaоtiњngе cпoаlлliеsiоoзn ојске старости (откривена на подручју Малог Јастрепца, источни део). Током конвергенције поменутих микроплоча долазило је до више кратног повлачења субдукционог рова и саме подинске литосфере ( или ‘колизија субдукционим повлачењем’) што је утицало на син- Кључне речи колизионо истезање ригидног блока повлатне Српско-македонске Јастребачки полиметаморфни маргине. Осим тектонског модела, изнети су закључци о дужини трајања комплекс, Источна вардарска и правцима обдуковања поменутих офиолита на Српс ко-македонску је - зона, интраокеанска субдукција, диницу (деформациона фаза D1 ) тј. на залеђе Апуљско-јадранске микро - „колизија субду: кционим плоче је: (1) иниreцtиreјаaлtнinаg п cрoоllсiтsiоoрn но ограничена, са лимитираном дужином подвлачењем“, западно-вергентно западно-вергентног обдуковања офиолита ИВЗ преко доњег- или навлачење. Неотетиcoсrкeо-гc o(mЗаpпleаxдно вардарског тј. ЗВЗ) океанског литоферног сегмента (слично као и у наставку Вардарске зоне у Грчкој; Пеониас зона). Такође, предложеним системом се објашњава ексхумација тј. екстензија повлатног блока у конвергентном односу и резултујућим ства - рањем доме Великог Јастрепца (фаза D4 ). Introduction flicting structural-tectonic and paleogeographic re - constructions. The East Vardar Zone ophiolites can The conflicting Jastrebac accretionary assembly either be identified as (i) oceanic system overl ain by (central Serbia; Fig. 1a) have been interpreted either a Serbo-MacedoniAaknić margin (gneiMssiT-drioJEmViić nating as a tectonic window exposing formerly underplating crystalliEnTer oroVicć ks; r et. al., 1969; D et. al., distal paleogeographicr dAok mains of the African Apu - 2001 ; P et al., 2015) or (ii) as oph iolite entity sen - lia/Adria microplate ( E et al., 2016) or an outcrop - which overrode the Serbo-Macedonian continental su ping segment of the Sava-VAarrodVairć back system of the margin. The latter concept is elaborated by the ophi - main Neotethyan ocean ( M et al., 2007). There olite obduction oChnM tioD p N–S to NW–SE trendrAink g sub - is alsroU Nan opinion that the latter core-complex ( duction zAoFnFieo N( SE VAN et aiNl.S, B2E0r0GE8N , 2019; E et al., B et al., 2018) exporUsiBnić g the greenschist level 2016; M & h , 2018). There is elements confirmed ( G et al., 1999) for the also an opinion that this zone can be qualified as a nearby Supragetic basement. Moreover, the intri - segment of mixed exoteknoLsional and compressional cacy multiplies because the nearby ophiolite-bear - pull-apart systems ( S et al., 2019). Such uncer - ing segment of the East Vardar Zone (including tainty of the reconstructed former cross-lithos - U66 pper Cretaceous turbidites of western Veliki Jas - pheric orientations mGeaolk. aens. Batlhk.e p olpuoasl.e, 2o0g19e, o80g (r2a), p65h–i8c5 trebac; Fig.1; red question mark) has a set of con - inheritance of the exhumed Jastrebac agglomeration Intraoceanic subduction of the northwestern Neotethys and geodyamic interaction with Serbo-Macedonian foreland: ... ArAMATA ChMiD e.g 2001; k , 2006; S et. al., 2008, 2019; Figs. 1, 2). Several essential outcrops allowing a bet - ter understanding ofT AhMigPhLli y compleSxo MNTeosS ozoicö rpöa S - leogeogTrAaMpPhFyL i ( ., oS ChArD , 2001;V CAN iNSB&Er VGEN , 2004; S & h , 2009; h et e.g al ., 2019 ) and associated cross-lithospheric config - urations are those elevating the Neotethyan oceanic crust (exhumation viaA proVsitć -accretionary TcoJrAeD-icNoomVić- plex formation; ., M et al., 2007; S et al., 2013). The lithospheric remnants of north - western Vardar/Neotethyan ocean are consisting of the two elongated NNW–SSE-directed ophiolite- belts: West Vardar Zone or the main Vardar/Neo - tethys ocean and the adjoining heavily disrupted East Vardar Zone reipMriTersieJEnVtiić ng itsiM miTarrigJEiVniać l basin (hereinaiMftieTr iEJEVViZć ; D ArAM&AT DA rE,ć 1ko9V7i3ć , 19A T7o5ć;A DNiN , 2001; k , 2006; S - B et. al., 2012; Fig. 2). The investigated cross-lithospheric segment (vicinity of Jastrebac), in addition to these Upper Cretaceous to Paleogene turbidites has the record of late Jurassic - Lower Cretaceous shallow marine, clastic sequence with some turbidite ifMeia TtruirJEeVsi ć re - feirMrieTdri JtEoV ićas the “paraflysch” (after D & Fig. 1 . a. North Mediterranean including Alpine-Dinaride-Carpa - D , 2009). thian mobile belt and Jastrebac location; b. Geographical map The aims of this study are the (i) reassessment showing position of the Jastrebac tectonic window protruding be - of the conflicting cross-lithospheric orientations re - tween the two arcuate morphotectonic systems (Dinarides and porting the interaction between the Neote thyan-, Serbo-Macedonian as European foreland including the Carpatho- EVZ ophiolites and S erbo-Macedonian accretio nary Balkanides). The Vardar Zone includes its marginal system referred margin, whereas we further propose (ii) a geodynamic to as the East Vardar Zone stretching into North Macedonia and concept based on the intraoceanic subduction model Greece . (main West Vadar plate beneath the back-arc sys - tem). importantly, the suggested cross-lithospheric kinematic model is autono mous of the uncertain age of the highly deformed Jastrebac greenschist pack - age, which we moreover describe
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