The origin of volcanic section of the Vardar ophiolitic zone: a comparative petrological and geochemical study of latecretaceous volcanics from Macedonia with their jurasic counterparts from Balkans

Prelevic, Dejan and Wehrheim, Simon and Bozovic, Milica and Romer, Rolf and Boev, Blazo (2014) The origin of volcanic section of the Vardar ophiolitic zone: a comparative petrological and geochemical study of latecretaceous volcanics from Macedonia with their jurasic counterparts from Balkans. Optimal research and sustainable usage of the geological resources.

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Abstract

Since the first appearance of the term “ophiolite” in 1813, its definition and interpretation was under consistent debate. First interpretation of ophiolites as being serpentinized peridotites associated with a suite of magmatic rocks evolved exclusively at the ocean floor extruded at mid ocean ridges (MOR)(e.g. Gass, 1968; Moores and Vine, 1971), was later doubted by Miyashiro (1973). Based on geochemical studies of the Troodos ophiolite (Cyprus), it was recognized close spatial and temporal occurrence of MOR-basalts with magmatic rocks typically showing subduction related calc-alkaline trend. Since then the evidence for an arc related origin of many Mediterranean ophiolites has hardened over decades, but the contrasting volcanic association of arc-lavas like boninites, arc tholeiites or adakites with MORBs was representing a long lasting conundrum. It was only recently recognized that this perplexing issue my be solved if the ophiolites formed during initiation of subduction within or near a ridge (Barth et al., 2008, Barth and Gluhak, 2009; Reagan et al., 2010; Pearce & Robinson, 2011, Božović et al., 2013). In the recent decades worldwide studies of ancient and recent ophiolites and improvement of geochemical measurement techniques led to the idea of a broad geotectonic range of ophiolite generation (Dilek and Furnes, 2011). Although the magmatic origin of ophiolites in an ocean extension environment is unquestioned, Dilek and Furnes (2011) further subdivided ophiolites in supra-subduction zone, continental margin, mid-ocean-ridge, plume-type, volcanic arc and accretionary-type ophiolites.

Item Type: Article
Subjects: Natural sciences > Other natural sciences
Divisions: Faculty of Natural and Technical Sciences
Depositing User: Blazo Boev
Date Deposited: 03 Jun 2014 08:50
Last Modified: 12 Mar 2015 14:27
URI: http://eprints.ugd.edu.mk/id/eprint/10036

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