Original scientific paper

https://doi.org/10.17794/rgn.2016.2.1

MIDDLE TRIASSIC AUTOCLASTIC DEPOSITS FROM SOUTHWESTERN BOSNIA AND HERZEGOVINA

Duje Smirčić ; University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering, Pierottijeva 6, HR-10 000 Zagreb
Boško Lugović ; University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering, Pierottijeva 6, HR-10 000 Zagreb
Dunja Aljinović ; University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering, Pierottijeva 6, HR-10 000 Zagreb
Hazim Hrvatović ; Federalni zavod za geologiju/Geological Survey of Federation of Bosnia and Herzegovina, Ilidža, Ustanička 11, 71 210 Sarajevo, BiH
Tea Kolar-Jurkovšek ; Geološki zavod Slovenije/Geological Survey of Slovenia , Dimičeva 14, Sl-1000 Ljubljana
Bogdan Jurkovšek ; Geološki zavod Slovenije/Geological Survey of Slovenia , Dimičeva 14, Sl-1000 Ljubljana
Filip Gajšak ; University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering, Pierottijeva 6, HR-10 000 Zagreb

Abstract

Middle Triassic volcanic and volcaniclastic rocks have been recognized at several localities near Bosansko Grahovo, in southwestern part of Bosnia and Herzegovina in the External Dinarides. Peculiar types of autoclastic rocks were investigated. These are peperites and hyaloclastites. Regarding specific structures, mineral composition and micropetrographic characteristics it was possible to further differentiate hyaloclastites into in situ hyaloclastites and slightly resedimented hyaloclastites that represent genetic succession. All rock types occurred in a deep sea troughs that formed as a consequence of Middle Triassic extensional tectonic and rift related wrench faulting. In situ hyaloclastites and slightly resedimented hyaloclastites were formed due to quenching at the contact of lava effusions with sea water. Genesis of peperites is related to lava emplacement in unconsolidated water saturated lime mudstones that were deposited in deep sea basin. All investigated rock types represent first findings of autoclastic deposits in the External Dinarides. Biostratigraphic constraints achieved by means of conodont species Neogondolella excentrica, Paragondolella excelsa, Paragondolella trammeri and Gladigondolella tethydis indicate Late Anisian to Early Ladinian interval of the autoclastic deposits from Bosansko Grahovo.

Keywords

autoclastites; hyaloclastites; peperites; Middle Triassic; External Dinarides; Bosnia and Herzegovina

Hrčak ID:

156708

URI

https://hrcak.srce.hr/156708

Publication date:

1.6.2016.

Article data in other languages: croatian

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