The Demir Kapija Ophiolite, Macedonia (FYROM): a Snapshot of Subduction Initiation within a Back-arc

Božović, Milica; Prelević, Dejan; Romer, Rolf L.; Barth, Matthias; Bogaard, Paul van den; Boev, Blažo

doi:10.1093/petrology/egt017

Cited by 35 publications

(49 citation statements)

References 92 publications

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“…In the following subsections the available data on geological and geochemical characteristics of the East Vardar ophiolites in Romania [10,[29][30][31], Serbia [32][33][34][35][36], Macedonia [33][34][35][36][37] and Greece [33,[38][39][40], are summarized. The locations of the ophiolite massifs/outcrops addressed in this study are shown in Figure 1.…”

Section: East Vardar Ophiolitesmentioning

confidence: 99%

“…In the west, it is in contact with the metamorphic rocks of the Paikon unit that consists of Triassic marbles, clastic sediments, micaschists and various Upper Jurassic volcanic rocks that range in composition from rhyolite to basalt [47][48][49]. The northern part of the Guevgeli complex is the Demir Kapija ophiolites [33,34,37]. It is situated in southernmost Macedonia as an NNW-SSE elongated, 50 km long and 25 m wide and partially dismembered belt.…”

Section: Geologymentioning

confidence: 99%

“…These granitoids cut the basement and are, therefore, considered as post-ophiolite intrusions [52]. Božović et al [37] reported U/Pb zircon age for gabbros of Demir Kapija at 166 ± 1.8 Ma constraining the age of the oceanic crust, which agrees well with Bathonian-Callovian radiolarian [53]. It is also obtained only a slightly lower age of 164 ± 0.5 Ma for presumably younger subductionrelated rocks by Ar/Ar analyses of feldspars [37].…”

Section: Geologymentioning

confidence: 99%

“…Transylvania - [30]; Ždraljica and Kuršumlija - [32][33][34]; Guevgeli - [37][38][39]; Circum Rhodope - [38,40]; Intrusives in the basement - [33]; West Vardar basic rocks - [17,34,67,68].…”

Section: Rock Geochemistrymentioning

confidence: 99%

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East Vardar Ophiolites Revisited: A Brief Synthesis of Geology and Geochemical Data

et al. 2018

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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 Peninsula in Greece. The summarized geological data suggest that the East Vardar ophiolites are mostly composed of the magmatic sequences, whereas the mantle rocks are very subordinate. The members of the magmatic sequences are characterized by the presence of abundant acid and intermediate volcanic and intrusive rocks. The age of these ophiolites is paleontologically and radiometrically constrained and these data suggest that the East Vardar ophiolite formed as a short-lived oceanic realm that was emplaced before the uppermost Kimmeridgian. A relatively weak adakitic affinity is shown by intra-ophiolitic acid and intermediate rocks in many East Vardar provinces. It can be taken as evidence that the subduction of the young and hot slab, most likely along the earlier spreading ridge has occurred. A paleo-tectonic reconstruction consisting of four stages is proposed. It involves: a) an early/mid-Jurassic northnortheastward subduction of the West Vardar oceanic plate; b) the formation of a mid-Jurassic volcanic arc and a narrow back-arc oceanic stripe of East Vardar behind it; c) the mid-/Upper Jurassic initiation of East Vardar subduction along the ridge axis, and d) complex and heterogeneous emplacement of the East Vardar ophiolites. So far available data allow for having relatively clear ideas about the origin and evolution of the East Vardar ophiolites. However, in order to provide better understanding of all aspects of its evolution we need to answer additional questions related to the true structural position of the East Vardar ophiolites slices in Serbia, the exact nature of subduction that caused back-arc spreading (intraoceanic vs subduction under continent?) and the full significance of the adakitic signature shown by rocks in the East Vardar provinces other than Demir Kapija.

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Section: East Vardar Ophiolitesmentioning

confidence: 99%

Section: Geologymentioning

confidence: 99%

Section: Geologymentioning

confidence: 99%

Section: Rock Geochemistrymentioning

confidence: 99%

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East Vardar Ophiolites Revisited: A Brief Synthesis of Geology and Geochemical Data

et al. 2018

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“…U okviru IVZ (Peonias zone), ofioliti Demir Kapije kartirani su dvojako, kao da su navučeni preko SMM [6], [7] ili kao da je preko njih tektonski smeštena SMM [8]. Postoje sugestije da je ovaj ofiolitski kompleks formiran otvaranjem izalučnog basena iza Paikon luka [9], [10], i da je kasnije navučen zapadno na njega [11]. Sa druge strane, Robertson et al u [12] tvrde da su ovi ofioliti originalno navučeni preko SMM i kasnije, tokom kasne jure, ponovo navučeni prema zapadu.…”

Section: Uvodunclassified

Spatial distribution of the Demir Kapija (Macedonia) ophiolite based on geomagnetic data

Petrovic¹,

Cvetkov²,

Cvetkovic³

2016

Tehnika

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Sediment melting during subduction initiation: Geochronological and geochemical evidence from the Darutso high‐Mg andesites within ophiolite melange, central Tibet

Zeng

Chen

et al. 2016

Geochem Geophys Geosyst

111

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In addition to fluids, the concept of sediment‐derived melts infiltrating the fore‐arc mantle during subduction initiation has been proposed based on studies of modern subduction zones and ophiolite mélange. However, outcrops that contain the products of such melts are rare, especially in conjunction with boninite. New U‐Pb zircon dating reveals that the Darutso volcanic rocks (DVRs) within ophiolitic mélange in the Beila area, central Tibet, crystallized at ∼164–162 Ma. This is the first recognition of Jurassic volcanic rocks in the middle section of the Bangong‐Nujiang Suture Zone. Geochemically, the DVRs are high‐Mg andesites with moderate SiO2 (59.03–63.62 wt %) and high MgO (3.74–6.53 wt %), Cr (up to 395 ppm), and Mg# (50.3–67.9). They also have high Th contents, (La/Sm)N ratios, and (87Sr/86Sr)i values (0.7085–0.7147); low Ba/Th, U/Th, and Sr/Y ratios; and negative values of εNd(t) (−8.7 to −9.8) and zircon εHf(t) (−7.4 to −9.9). The εNd(t) values of the DVRs overlap those of regional sediments. Detailed analyses of these geochemical characteristics indicate that the DVRs were derived from partial melting of subducted sediments and subsequent interaction with overlying mantle peridotite in a shallow and hot setting. In combination with the regional geology, in particular adjacent ophiolites that contain MORB‐like and boninite mafic lavas, these rocks collectively recorded the evolution of a fore‐arc setting during the initiation of the northward subduction of the south branch of the Bangong‐Nujiang Ocean. Therefore, the results provide direct evidence for sediment melting during subduction initiation and constrain the Jurassic tectonic evolution of the Lhasa terrane.

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The Demir Kapija Ophiolite, Macedonia (FYROM): a Snapshot of Subduction Initiation within a Back-arc

Cited by 35 publications

References 92 publications

East Vardar Ophiolites Revisited: A Brief Synthesis of Geology and Geochemical Data

East Vardar Ophiolites Revisited: A Brief Synthesis of Geology and Geochemical Data

Spatial distribution of the Demir Kapija (Macedonia) ophiolite based on geomagnetic data

Sediment melting during subduction initiation: Geochronological and geochemical evidence from the Darutso high‐Mg andesites within ophiolite melange, central Tibet

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