Radiometric K/ag data as evidence of the geodynamic evolution of the Zdraljica ophiolitic complex, central Serbia

Kristina Resimic-Saric,Vladica Cvetkovic,Kadosa Balogh

doi:10.2298/gabp0566073r

Kristina Resimic-Saric, Vladica Cvetkovic + Show 1 more

Open Access

https://doi.org/10.2298/gabp0566073r

Copy DOI

Abstract

The study presents age data and petrologic characteristics of igneous rocks of the Zdraljica ophiolitic complex (ZOC), situated in central Serbia, 150 km south of Belgrade. The complex consists predominately of a MORB/VAB-like tholeutic suite, represented mostly by gabbros and diabases. The tholeiitic suite is intruded by calc-alkaline intermediate and acid magmas of a VA-affinity, which presumably formed in a pre-collisional setting. The whole complex is intruded by peraluminous granite magmas. The crystallization age of the calc-alkaline pre-collisional quartzdiorite is 168.4?6.7 Ma and it post-dates the formation of the here exposed ocean?ic crust. Geological evidence suggest that the emplacement of the complex occurred during the Upper Jurassic. With respect to their petrology and age, the Zdraljica ophiolitic rocks are similar to the south Apuseni Mts. ophiolites, situated to the north, and to the Kursumija and Guevgeli ophiolites, situated to the south. All these ophiolites probably formed as parts of a single Jurassic belt, which can be termed the eastern branch of the Vardar Zone.

Highlights

Ophiolitic complexes are remnants of the oceanic lithosphere which where obducted onto colliding continental plates
The time of emplacement can be inferred from the fact that the @OC is associated with a Middle/Upper Jurassic diabase-chert formation (MARKOVI] et al, 1968, DOLI] et al, 1981) and that its immediate overstep sequence is represented by Tithonian limestones and Lower Cretaceous paraflysch (MARKOVI] et al, 1968; DOLI] et al, 1981)
The Fanos granite was dated 148±3 Ma (K/Ar on biotite; SPRAY et al, 1984) and 150±2 Ma (K/Ar and Rb/Sr on biotite; BORSI et al, 1966). These ages can correspond to the time of intrusion of @draljica leucocratic granitoids in the syn- to post-collisional phase following the emplacement of ophiolites

Summary

Introduction

Ophiolitic complexes are remnants of the oceanic lithosphere which where obducted onto colliding continental plates. The complex is located near Kragujevac in central Serbia, about 150 km south of Belgrade and it covers about 30 km (Fig. 1) This ophiolite complex is geotectonically situated along the easternmost margin of the Vardar Zone and shares the following general characteristics of the ophiolites of the eastern branch of the Vardar zone (KARAMATA et al, 1999): (i) they are predominantly composed of igneous members of ophiolites, (ii) they are characterized by rare exposures of peridotitic bodies commonly severely serpentinized, (iii) they contain various granitic rocks, and (iii) their overstep sequence is Upper Jurassic in age (e.g. KARAMATA et al, 2005)

Analytical procedure

Discussion and concluding remarks