Evoluzione cretacica di un settore della piattaforma apula da dati di sottosuolo e di affioramento (Appennino campano-molisano)

摘要: Seismic and outcrop data suggest that the Mesozoic carbonate successions cropping out in Matese Camposauro Groups, central-southern Apennines of peninsular Italy, can be interpreted as an exposed part Inner Apulia Platform (PAI). Cretaceous sequences have been studied detail field compared with coeval sediments Unit cored Benevento oilfield Monte Taburno 1 Morcone 1bis wells. Subsurface show that, starting from late Aptian time onwards, was dismembered into a series sub-domains which included shelfal productive areas small intra-platform basins (or elongated depressions). These mean Apennine orientation were locally affected by significant subsidence. Outcrop analyses indicate similar tectono-sedimentary trends led to recognition three main structuring phases, ascribed Middle Aptian, Late Aptian-Albian Early-Middle Cenomanian intervals, respectively. The structural features, formed during first phase, repeatedly reactivated subsequent phases controlled palaeo-environmental evolution various sub-domains, characterised different facies associations. The analysis integrated core shows analogous evolutionary trends. In particular, middle-late factories display sharp variation sedimentary dynamics depositional architectures: uniform pre-Aptian shallow-lagoon rimmed system rapidly evolved much complex shallow-water rudist-dominated located alongside by-pass deeper basinal areas. At outcrop, steering toward open marine conditions correlated early (middle Aptian) phase platform. This trend is marked easternmost formation tectonically active margins, presence channel networks, but also evident innermost sectors (western areas) shelves, increase frequency intensity high-energy events. The varied time-span «mid-Cretaceous» stratigraphic gaps (see Carannante et alii , 1987, 1994; Ruberti, 1992) supports hypothesis tectonically-controlled palaeo-topography differential related sub-domains. Since Turonian, shallow sea encroached on lands. Deposition water rudist-rich followed. peculiar features benthic assemblages dwelled patchily loose substrata resulted lack real reefs at shelf margins. enhanced circulation 3D arrangement bodies made up mainly large coalescing sheets winnowed fine coarse skeletal sands. fraction, produced intensive bio-erosive mechanical processes acting diagenetically stable calcite-shelled organisms, covered most shelf. amount silt- pebble-sized bio-clastic debris periodically removed shelf, transported (often through submarine channels) re-sedimented adjacent strongly subsiding Lower phases. Finally, study available seismic lines allowed for correlation between Mountains well oilfield. lines, tied data, structure several thrusts where older units pertaining are piled over younger siliciclastic Miocene Foredeep. Further, foredeep deposits old lower-middle Tortonian Eastern Matese, while young Pliocene remarkable time-polarity appears support presented this contribution, makes it possible constrain timing thrust emplacement sector Chain.