In the Posušje region of the External Dinarides (Bosnia and Herzegovina), bauxite deposits are hosted along a Late Cretaceous–Paleogene forebulge unconformity that records an extended emersion phase of the Adriatic Carbonate Platform. Historically, open-pit mining has targeted surface and shallow subsurface bauxite bodies, but ongoing exploration must now focus on deeper structurally preserved deposits. To address this challenge, we integrate remote sensing, geological mapping, borehole data, and 3D structural modeling to assess the distribution and structural controls of bauxite deposits. Balanced and restored cross-sections reveal a complex interplay between inverted normal faults, fold structures, and foredeep burial, which collectively influenced bauxite accumulation and preservation. Statistical analyses of deposit size, shape, and orientation indicate that larger bauxite bodies are concentrated in the footwalls of inverted normal faults, where prolonged or repeated exposure enhanced karst development and bauxite accumulation. Additionally, the predominant NW–SE elongation of bauxite bodies suggests that pre-existing structural lineaments played a key role in paleokarst morphology, supporting the influence of syn-depositional extensional faulting on bauxite distribution. These findings demonstrate that bauxite exploration in fold–thrust belts requires an integrated structural approach, where 3D geological modeling can delineate prospective areas prior to costly geophysical surveys and drilling campaigns. Insights from the Posušje region can refine mineral exploration strategies in other orogenic settings, highlighting the importance of structural inheritance in karst bauxite accumulation and preservation.
3 August 2026 in Proceedings of reviewed papers: 6th Croatian geomathematical congress
The Danube and Drava fluvial-wetland system of Kopački Rit Nature Park represents a highly dynamic depositional environment in which open water, abandoned channels, marsh vegetation, and sedimentary bodies respond to hydrological connectivity, flood pulses, and anthropogenic regulation. This paper uses Sentinel-2 imagery, water indices, supervised classification, and recent evidence of sedimentation to assess morphosedimentary development in a selected part of the Nature Park. Maximum Likelihood and Random Forest classifications are compared as a reliability-control step before geomorphological interpretation. The methodological framework includes NDWI and MNDWI equations, Maximum Likelihood and Random Forest decision functions, accuracy assessment, classarea change, and station-based vertical sedimentation/erosion change. The preliminary interpretation indicates that Maximum Likelihood yields a smoother, more hydrologically coherent delineation of water and sediment classes, whereas Random Forest is more fragmented in shallow and transitional wetland zones. Field evidence from the NATURAVITA project monitoring program confirms active recent sediment accumulation in Kopačevsko/Kopačko Lake, Tikveš, and Vemeljski Dunavac. Together, the satellite and field data indicate progressive channel infilling, lake shallowing, and succession from open-water environments towards marsh and terrestrial vegetation.