Marija Radisavljević , Nikola Burazer , Aleksandra Šajnović , Darko Spahić , Gordana Gajica , Sabina Kovač , Violeta Gajić , Branimir Jovančićević
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Supported by recent constraints on a deeper basinal section of eastern and western subbasin depocenters, the composite study of the segmented Toplica Basin involved geological, sedimentological, mineralogical, inorganic, and organic geochemical analysis, as well as constraints on interchanging geodynamic drivers. The data were extracted from thirty-one selected samples from four sedimentary lithomembers: A, B, C, and D. The architecture of these deposits reflects an intricate pattern influenced by complex lake bottom and subsurface geology (dis)connecting the two depocenters. The investigated Neogene deposition, as a whole, was dominantly controlled by a lithospheric-scale extensional graben system (involving the Jastrebac core complex-type tectonic exhumation) developed on top of the underlying Serbo-Macedonian basement unit. The crustal extension allowed rapid material inflow from other exposed sequences of the juvenile basin, including the abutting surface exposures. During the initial stretching and basin subsidence stage, sediment inflow towards the eastern Toplica depocenter was hindered. The influx of surface-eroded material was interrupted by a natural “obstacle”. In turn, such a configuration facilitated voluminous material transport into the western depocenter of the basin, thereby controlling the deposition of lithomembers A and B. After the deposition of lithomember B ceased, the “barrier”, or likely intrabasinal structural high, contributed to a reversal of the former westward-directed transport. In that manner, the vertical movements of the structural high enabled material transfer typical for the eastern basin segment, consequently prompting a sedimentary development of the lithomembers C and D.</p><p>In this context, mineralogical and geochemical differences between the sequences are used as tracers of depositional changes affected by tectonic events. Sequences of sand and gravel layers of upper lithomembers C and D pointed out that alluvial processes strongly influenced their depositional cycle. On the other hand, a more pronounced presence of sulfide minerals (pyrite concretions) in lithomembers A and B correlated with a calm and anoxic paleoenvironment. The elevated trend of mixed terrigenous and/or microbiologically reworked organic matter (higher carbon/nitrogen (C/N) ratio and terrigenous/aquatic (TAR) ratio, the lower sum of steroids/sum of hopanoids (S/H)) ratio, deposited under anoxic–dysoxic freshwater lacustrine conditions (higher pristane/phytane (Pr/Ph) ratio, absence of squalane (<em>i</em>-C<sub>30</sub>) and β-carotane), is observed towards a shallower section of the borehole (lithomembers C and D).</p></div>","PeriodicalId":50290,"journal":{"name":"International Journal of Sediment Research","volume":"39 3","pages":"Pages 401-420"},"PeriodicalIF":3.5000,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1001627924000313/pdfft?md5=2b4632e103cfb126e2480c15e5ff9a54&pid=1-s2.0-S1001627924000313-main.pdf","citationCount":"0","resultStr":"{\"title\":\"Towards an understanding of southern peri-Pannonian lacustrine depositional cycles: Interplay of sediment delivery and shifting intrabasinal height, a case study of drilled Neogene sediments from northwest Toplica Basin (Central Serbia)\",\"authors\":\"Marija Radisavljević , Nikola Burazer , Aleksandra Šajnović , Darko Spahić , Gordana Gajica , Sabina Kovač , Violeta Gajić , Branimir Jovančićević\",\"doi\":\"10.1016/j.ijsrc.2024.03.006\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>A multidisciplinary approach allowed the reconstruction of the shallow, highly complex Neogene lacustrine-type sedimentological interplay between the peri-Pannonian (sub)basin subsidence and its seafloor topography. 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引用次数: 0
摘要
采用多学科方法重建了新近纪浅层、高度复杂的湖沼型沉积作用,以及近潘诺尼亚(亚)盆地沉降与其海底地形之间的相互作用。本研究通过分析在托普利卡盆地西北部或更浅的沉积中心(BL4 号钻孔,深度达 630 米;塞尔维亚中部)钻探到的中新世中期沉积物的沉积周期,进一步讨论了局部隆起和下沉的机制。在东部和西部子盆地沉积中心较深基底剖面的最新制约因素支持下,对分段式托普利卡盆地的综合研究包括地质、沉积学、矿物学、无机和有机地球化学分析,以及对相互变化的地球动力驱动因素的制约。这些数据是从四种沉积岩岩性的 31 个选定样本中提取的:这些沉积物的结构反映了受复杂湖底和连接两个沉积中心的地下地质影响的复杂模式。所调查的新近纪沉积作为一个整体,主要受控于在下伏的塞尔维亚-马其顿基底单元顶部发育的岩石圈规模的伸展地堑系统(涉及亚斯特雷巴克岩芯复合型构造剥蚀)。地壳的延伸使得物质从幼年盆地的其他出露地层(包括毗邻的地表出露地层)迅速流入。在最初的延伸和盆地下沉阶段,沉积物流入托普利卡东部沉积中心受到阻碍。地表侵蚀物质的流入被一个天然 "障碍 "阻断。反过来,这种构造又促进了大量物质向盆地西部沉积中心的迁移,从而控制了岩体 A 和岩体 B 的沉积。在岩体 B 停止沉积后,"障碍"(可能是盆地内构造高点)又促使以前的西向迁移发生逆转。这样,构造高地的垂直运动使得东部盆地段的典型物质转移成为可能,从而促使岩性 C 和 D 的沉积发展。
Towards an understanding of southern peri-Pannonian lacustrine depositional cycles: Interplay of sediment delivery and shifting intrabasinal height, a case study of drilled Neogene sediments from northwest Toplica Basin (Central Serbia)
A multidisciplinary approach allowed the reconstruction of the shallow, highly complex Neogene lacustrine-type sedimentological interplay between the peri-Pannonian (sub)basin subsidence and its seafloor topography. The current study further discusses the mechanism of localized uplift and subsidence by analyzing depositional cycles of middle Miocene sediments drilled in a northwestern or shallower Toplica Basin depocenter (borehole BL4, depth up to 630 m; Central Serbia). Supported by recent constraints on a deeper basinal section of eastern and western subbasin depocenters, the composite study of the segmented Toplica Basin involved geological, sedimentological, mineralogical, inorganic, and organic geochemical analysis, as well as constraints on interchanging geodynamic drivers. The data were extracted from thirty-one selected samples from four sedimentary lithomembers: A, B, C, and D. The architecture of these deposits reflects an intricate pattern influenced by complex lake bottom and subsurface geology (dis)connecting the two depocenters. The investigated Neogene deposition, as a whole, was dominantly controlled by a lithospheric-scale extensional graben system (involving the Jastrebac core complex-type tectonic exhumation) developed on top of the underlying Serbo-Macedonian basement unit. The crustal extension allowed rapid material inflow from other exposed sequences of the juvenile basin, including the abutting surface exposures. During the initial stretching and basin subsidence stage, sediment inflow towards the eastern Toplica depocenter was hindered. The influx of surface-eroded material was interrupted by a natural “obstacle”. In turn, such a configuration facilitated voluminous material transport into the western depocenter of the basin, thereby controlling the deposition of lithomembers A and B. After the deposition of lithomember B ceased, the “barrier”, or likely intrabasinal structural high, contributed to a reversal of the former westward-directed transport. In that manner, the vertical movements of the structural high enabled material transfer typical for the eastern basin segment, consequently prompting a sedimentary development of the lithomembers C and D.
In this context, mineralogical and geochemical differences between the sequences are used as tracers of depositional changes affected by tectonic events. Sequences of sand and gravel layers of upper lithomembers C and D pointed out that alluvial processes strongly influenced their depositional cycle. On the other hand, a more pronounced presence of sulfide minerals (pyrite concretions) in lithomembers A and B correlated with a calm and anoxic paleoenvironment. The elevated trend of mixed terrigenous and/or microbiologically reworked organic matter (higher carbon/nitrogen (C/N) ratio and terrigenous/aquatic (TAR) ratio, the lower sum of steroids/sum of hopanoids (S/H)) ratio, deposited under anoxic–dysoxic freshwater lacustrine conditions (higher pristane/phytane (Pr/Ph) ratio, absence of squalane (i-C30) and β-carotane), is observed towards a shallower section of the borehole (lithomembers C and D).
期刊介绍:
International Journal of Sediment Research, the Official Journal of The International Research and Training Center on Erosion and Sedimentation and The World Association for Sedimentation and Erosion Research, publishes scientific and technical papers on all aspects of erosion and sedimentation interpreted in its widest sense.
The subject matter is to include not only the mechanics of sediment transport and fluvial processes, but also what is related to geography, geomorphology, soil erosion, watershed management, sedimentology, environmental and ecological impacts of sedimentation, social and economical effects of sedimentation and its assessment, etc. Special attention is paid to engineering problems related to sedimentation and erosion.