A Source-to-Sink Compositional Model of a Present Highstand: An Example in the Low-Rank Tiber Depositional Sequence (Latium Tyrrhenian Margin, Italy)

作者: Daniel Tentori , Salvatore Milli , Kathleen M. Marsaglia

DOI: 10.2110/JSR.2018.60

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摘要: Abstract Our source-to-sink compositional model of sediment distribution in the present highstand Tiber Depositional Sequence has important implications for source lithology, generation, transport, and deposition. In River system, sand trends reflect provenance mixing, anthropic intervention, effects local autogenic factors continental to marine depositional environments. Fluvial feldspatho-quartzo-lithic results from contribution major tributaries drainage basin, which can be divided into two sub-basins separated by Corbara dam built 1950s. Upstream-drainage-basin a siliciclastic sedimentary lithic signature, whereas carbonate volcanic fragments dominate downstream-drainage-basin sand. Downstream is further modified coastal environment hydraulic sorting, mixed with detritus derived recycling dune altered volcaniclastic paleosols. The latter are associated lower-course floodplain channel deposits, produce quartzo-feldspatho-lithic Sediment grain-size zonation influenced hydrodynamics, which, turn, detrital populations distinct signatures behavior. Coarser minerals (essentially pyroxene phenocrysts) finer feldspar grains progressively concentrated higher-energy lower-energy environments, respectively. Biogenic shelf slope deposits off mouth show very little riverine influence. This study last system tract clarifies dependence, reworking controlling final composition modern knowledge used better understand modes ancient successions.

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