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We study the oldest evolutionary stage of the Miocene Kruševac lacustrine basin at a site exposing rarely observed latest Oligocene to early Neogene sediments. The recent historically lowest water levels in the Morava River (central Serbia) have played a crucial role in unveiling remarkable outcrops, providing a unique perspective on the earliest stages of basin evolution. The rarely exposed latest Oligocene to early Neogene sediments, particularly those of the Kruševac intramontane paleolake, have made a substantial contribution to our understanding of the peri-Pannonian syn-rift opening of a number of intramontane basins. This study delves into the early paleolake development stage in connection with the adjoining Aleksinac basin, both of which are accommodated on top of the former Neotethyan suture, its overriding crystalline continental plate (Mesozoic European foreland; central and eastern Serbia). A number of intramontane basins is, nevertheless, also developed on top of Neotethyan subducting counterpart, its formerly descending oceanic plate (Dinarides and Vardar Zone; Croatia, Bosnia & Herzegovina, Serbia). Our research methodology, which involved mapping an exposed area of the Morava riverbed uncovered by the record low water level during spring 2021 (Kruševac basin, central Serbia), has led to the discovery of a unique sequence with breccia composed of large angular crystalline clasts. We found large angular basement-derived gneiss-bearing Serbo-Macedonian cobbles embedded within the rocks of the presumed Oligocene–Miocene interval. The study highlights the importance of the presence of these large crystalline cobbles, which suggests the vicinity of the sediment sources responsible for supplying the initial syn-rift peri-Pannonian basal sequence. Drawing this analogy, such breccias appear to be deposited during the opening of numerous intramontane basins across Serbia and the Balkans. The initial transport from the crystalline source must be short, presumably gravitational. Shortly after, a shallow-water environment succeeded the early alluvial stage. It is worth noting that the brecciated sequence is devoid of fossils, which poses a challenge in determining the Late Oligocene age of the cobble-bearing sequence.

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Rare Field Evidence of Basal Breccia Within the Kruševac Lacustrine Basin: Constraints on the Late Oligocene (Early Miocene) Opening Across Southern Peri-Pannonian Intramontane Basins (Central Serbia)

  • 章节

  • 发表日期：

    2026年

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  • Darko Spahić,
  • Zoran Bojić,
  • Srđan Vuković

摘要

We study the oldest evolutionary stage of the Miocene Kruševac lacustrine basin at a site exposing rarely observed latest Oligocene to early Neogene sediments. The recent historically lowest water levels in the Morava River (central Serbia) have played a crucial role in unveiling remarkable outcrops, providing a unique perspective on the earliest stages of basin evolution. The rarely exposed latest Oligocene to early Neogene sediments, particularly those of the Kruševac intramontane paleolake, have made a substantial contribution to our understanding of the peri-Pannonian syn-rift opening of a number of intramontane basins. This study delves into the early paleolake development stage in connection with the adjoining Aleksinac basin, both of which are accommodated on top of the former Neotethyan suture, its overriding crystalline continental plate (Mesozoic European foreland; central and eastern Serbia). A number of intramontane basins is, nevertheless, also developed on top of Neotethyan subducting counterpart, its formerly descending oceanic plate (Dinarides and Vardar Zone; Croatia, Bosnia & Herzegovina, Serbia). Our research methodology, which involved mapping an exposed area of the Morava riverbed uncovered by the record low water level during spring 2021 (Kruševac basin, central Serbia), has led to the discovery of a unique sequence with breccia composed of large angular crystalline clasts. We found large angular basement-derived gneiss-bearing Serbo-Macedonian cobbles embedded within the rocks of the presumed Oligocene–Miocene interval. The study highlights the importance of the presence of these large crystalline cobbles, which suggests the vicinity of the sediment sources responsible for supplying the initial syn-rift peri-Pannonian basal sequence. Drawing this analogy, such breccias appear to be deposited during the opening of numerous intramontane basins across Serbia and the Balkans. The initial transport from the crystalline source must be short, presumably gravitational. Shortly after, a shallow-water environment succeeded the early alluvial stage. It is worth noting that the brecciated sequence is devoid of fossils, which poses a challenge in determining the Late Oligocene age of the cobble-bearing sequence.