FORMATION MECHANISMS OF FE-MN CONCRETIONS IN THE VIJENAC QUARRY, DINARIC OPHIOLITE ZONE
Journal Title: UNKNOWN - Year 2018, Vol 33, Issue 3
Abstract
Vijenac quarry, near Tuzla in Bosnia-Herzegovina, is composed of carbonate rocks locally embedding tectonically disturbed siltite and sandstone with Mn-Fe concretions. The quarry itself represent a part of Dinaric overstep sequences (Pogari series) unconformably overlying ophiolite mélange and ophiolite trust-scheets. Petrographic, chemical and XRD analyses had shown that the concretions may be divided into two types: (i) Mn-rich concretions with ≈17% of Mn and compact texture and (ii) Mn-poor (≈8% of Mn) and porous texture. The amount of Ca, Mg, Fe and organic matter, as well as analysed microelements (Ni, Cr) in both concretion types are similar. According to petrographic and XRD analyses, concretions are composed of calcite, dolomite, hematite, todorkite and takenelite. Todorokite is characteristic for concretions formed by diagenetic growth. Petrographic study confirmed the development of concretions within three stages including two generations of calcite. The studied concretions are formed within consolidated sandstones inheriting their sedimentary textures - therefore a late diagenetic process is assumed.
Authors and Affiliations
Srećko Bevandić, Tomislav Brenko, Elvir Babajić, Sibila Borojević Šoštarić
THE RESPONSE OF TUNNEL LINING ON THERMAL LOADING
The long-term functionality, i.e. stability of the lining of disposal tunnels is a precondition for the safe removal and reprocessing of spent nuclear waste from deep underground repositories in the near or more distant...
OUTLINE OF METALLOGENESIS OF THE WEST CARPATHIANS
Metallogenesis of the West Carpathians appears to be polycyclic and polygenetic. Its characteristic feature is a superposition of younger mineralization acts on older ones. These processes in some places are accompanied...
OPTIMALNI PARAMETRI MINIRANJA U TUNELIMA PATRONIRANIM I PUMPANIM EKSPLOZIVIMA S ELEKTRIČNIM I NEELEKTRIČNIM NAČINOM INICIRANJA
U radu su prikazani parametri bušenja i miniranja tijekom iskopa tunela Grič i Mala Kapela. Tuneli se izvode Novom austrijskom tunelskom metodom s dvije paralelne cijevi. Uspoređujući miniranje s patroniranim i pumpanim...
AN GEOLOGICAL OVERVIEW OF GLACIAL ACCUMULATION AND EROSIONAL OCCURRENCES AT THE VELEBIT AND THE BIOKOVO MTS., CROATIA
Numerous accumulation and erosional forms originating from the activity of small valley glaciers or cirque glaciers occur in the highest mountains in Croatia: Velebit (1757 m) and Biokovo (1762 m). They were produced dur...
DETONOGRAPHY: MAKING OF MEDIEVAL MINE PRINT
Using the force of explosive authors had made a print of the picture of Renaissance mine onto an aluminium plate. This technique is called Detonography. It has been introduced and developed by Evelin Rosenberg with a num...