| dc.description.abstract | The Ljubija ore deposits are the loci typici of siderite-barite-polysulphide deposits within
the Inner Dinarides, Gemerides and Eastern Alps. Numerous sites of ore outcrops, smaller
or larger ore bodies of mineralization, consisting of Fe carbonates, sulphides, barite and
fluorite are scattered over an area of 150 square km. The half billion tons of iron ore resources
occur as replacement in dolostones and limestones, and as open-space fillings
(veins, veinlets) in phyllites and sandstones. The genesis of the Ljubija ore deposits has
been explained as (i) syngenetic sedimentary-exhalative, (ii) hydrothermal-metasomatic in
Middle Triassic time or (iii) hydrothermal replacement of sedimentary carbonates in Permian
time. Basically two alternatives Variscan or Alpine metallogeny, frame the time of genesis
from the Middle Carboniferous to the Middle Triassic. Genetic interpretation of the
Ljubija ore deposits required convincing arguments based on recent achievements of plate
tectonics. This contribution presents a set of new data on ore petrology, geochemistry,
geology
and time of formation. The Ljubija ore field could justifiably be termed the “Ljubija
geothermal field”, due to its areal extent and the thermal characteristics of numerous
ore deposits and occurrences within the Sana-Una Palaeozoic terrain. The Ljubija geothermal
field marks the first signs of thermal instability of Pangea, revealing its breakdown
along the deep fractures and heralding incipient intracontinental rifting, the first phase of
the new Alpine Wilson cycle. The research reveals novel data on the P-T-X characteristics
of ore forming fluids (microthermometry, ion chromatography, Raman spectrometry), sulphur
isotopes, maturity of organic matter by vitrinite reflection, and age determination by
40Ar/39Ar and K-Ar methods. It adopts argumentatively all the estimated research parameters
that constrain a justified genetic model. | en_US |
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