Abstract
Triassic magmatic rocks in the Central Dinarides in Bosnia and Herze-govina are known from two separate geotectonic units: (1) the AdriaticCarbonate Platform (Outer Dinarides) and (2) the Palaeozoic–Triassicallochthonous complex. They are assigned to the same regional, genetic and geochemical unit. Their emplacement age is inferred from contacts with the surrounding marble and sedimentary rocks (post-Anisian for intrusives and Ladinian for effusives).The magmatic rocks display different levels of emplacement and crystallization (intrusive, effusive and dyke rocks). They represent different stages of magmatic differentiation, from gabbro/basalt via diorite/andesite to granodiorite/dacite and granites. The most frequent dyke rock is diabase. Pillow basalts indicate eruption under subaquaticconditions. Pyroclastic rocks within the volcano-sedimentary unit point to the temporary explosive character of orogenic magmatic activity. Most rocks are affected and modified by post-magmatic alteration and hydrothermal fluids. This led to the formation of spilite, keratophyre, quartz keratophyre and rarely K spilite.New geochemical data support the opinion that subduction was the main process which triggered the Triassic magmatic activity in the Central Dinarides. Although some of the investigated rocks reveal MORB characteristics (in the selected geochemical discriminations), most samples are enriched in all elements which are reported as characteristicfor arc magmatism at convergent margins including incorporationof sediments.
Highlights
In the Central Dinarides of Bosnia and Herzegovina, Triassic magmatic rocks are associated with platform carbonate sediments and occur frequently within Palaeozoic–Triassic allochthonous series
Previous investigations resulted in two different conclusions about the tectonic setting and origin of the Triassic magmatic rocks: (1) BEBIEN et al (1978) classified the rocks as a product of subduction-initiated magmatism, while
With respect to their general classification, qualification of samples for chemical analysis and applicability of discrimination methods, 15 rocks were selected covering the range of Triassic magmatism in Bosnia and Trubelja, Burgath & Marchig: Triassic Magmatism in the Area of the Central Dinarides
Summary
In the Central Dinarides of Bosnia and Herzegovina, Triassic magmatic rocks are associated with platform carbonate sediments and occur frequently within Palaeozoic–Triassic allochthonous series (mountains of Central Bosnia, Sana–Una Palaeozoic complex, southeast Bosnia near Čajniče, Foča, Tjentište and Kalinovik – Fig. 1). Previous investigations resulted in two different conclusions about the tectonic setting and origin of the Triassic magmatic rocks:. The aim of this work is to contribute new microscopic and geochemical data to the clarification of the tectonic setting of the Triassic magmatism in Bosnia and Herzegovina. Microscopic studies were performed for the classification of the rocks but they served mainly for estimating the intensity of alteration with possible changes of the original chemical composition, and from this the selection of appropriate geochemical discrimination diagrams (with elimination of elements which could be mobile in the course of alteration). ‘Classic’ and newly developed geochemical diagrams were used for determination of the geotectonic setting of the magmatic rocks including highly evolved members. Rare earth elements patterns were investigated and included in the discussion
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