1,720,983 research outputs found
Carbonate channel network in the Miocene syn-rift Sardinia basins
No full textMurru M., Simone Lucia, Vigorito M. Carbonate channel network in the Miocene syn-rift Sardinia basins. In: Géologie Méditerranéenne. Tome 28, numéro 1-2, 2001. Anatomy of Carbonate Bodies / Anatomie des corps carbonates. International Meeting / Colloque international. Marseille, 9-12 mai 2001, France, sous la direction de Marc Floquet, Jérôme Hennuy et Jean-Pierre Masse. pp. 133-137
Temperate carbonate deep-sea channels : depositional and architectural models. Miocene examples from Matese Mountains, Southern Appennines, Italy
No full textVigorito M. Temperate carbonate deep-sea channels : depositional and architectural models. Miocene examples from Matese Mountains, Southern Appennines, Italy. In: Géologie Méditerranéenne. Tome 28, numéro 1-2, 2001. Anatomy of Carbonate Bodies / Anatomie des corps carbonates. International Meeting / Colloque international. Marseille, 9-12 mai 2001, France, sous la direction de Marc Floquet, Jérôme Hennuy et Jean-Pierre Masse. pp. 173-176
A channelized temperate-type carbonate margin : geometries and controlling factors
No full textCarannante Gabriele, Vigorito M. A channelized temperate-type carbonate margin : geometries and controlling factors. In: Géologie Méditerranéenne. Tome 28, numéro 1-2, 2001. Anatomy of Carbonate Bodies / Anatomie des corps carbonates. International Meeting / Colloque international. Marseille, 9-12 mai 2001, France, sous la direction de Marc Floquet, Jérôme Hennuy et Jean-Pierre Masse. pp. 41-44
Anatomy of a submarine channel system and related fan in a foramol/rhodalgal carbonate sedimentary setting: a case history from the Miocene syn-rift Sardinia Basin, Italy
No full textDuring Aquitanian-Burdigalian times, thick mixed carbonate-siliciclastic successions were deposited in basins located on the grabens and half–grabens along the Oligo-Miocene Sardinia Rift Basin. Locally active tectonics, sea level variations and ecological factors combined to control the development and distribution of foramol carbonate factories as well as the remobilisation and the redeposition of carbonate sediments into the adjacent deeper areas. In the Isili Basin, foramol\rhodalgal carbonate factories developed on submerged structural highs which resulted from pre- and syn-sedimentary tectonics. These carbonate factories were periodically shaved mainly during negative sea level oscillations and the sediments removed were funnelled towards the basin through a complex submarine channel network which included a tributary belt, one main channel (Isili Channel) and the related fan. The Isili Channel is up to 1 km wide, 60–100 m deep and includes two stacked channel complexes each built up by several minor order channel-units. Complex strata geometries characterise the Isili Channel and its related architectural elements (e.g., overbank, levee, margin and channel thalweg) which also include up to 15 m high bedforms. Individual channel complexes were temporally related to individual fan systems whose spatial distribution and internal geometry were strongly controlled by the type and rate of sediment accumulation and in turn by relative sea-level oscillations. Facies associations include sandy to cobble-sized gravity flow and bottom current deposits as well as megabreccias characterised by impressive displaced and tilted blocks which resulted from major channel margin collapses. Detailed analysis has led to the reconstruction of the internal geometry and depositional architecture of these carbonate bodies and to the determination of the main controlling factors. The dimension and distribution of channel and channel-related depositional bodies have been accurately determined. This information provides a useful tool to analyse less extensively exposed analogues and to model foramol shelf to basin transitions and related channel and fan systems
Tectonically Controlled Carbonate Channelized Slope Complexes.A Cretaceous-Miocene Case-History From The Matese Mountains (Central-Southern Apennines, Italy).
No full textArchitectural patterns in a multistorey mixed carbonate-siliciclastic submarine channel, Porto Torres Basin, Miocene, Sardinia, Italy".
No full textIn the Sassari-Muros area, the analysis of extensive exposures of the Porto Torres sub-basin fill sequences have enabled a detailed reconstruction of a complex mixed carbonate-siliciclastic channel system. The exposed sequences, dated as Burdigalian-Serravalian, comprise a few kilometres wide and up to 200m thick channel complexes fringed by marly sheet deposits. Channels are erosional or mixed erosional-depositional type and show multiple, stacked, partly nested channel-fill sequences which relate to different filling phases. Individual channel-fills include sand to coble sized gravity flow deposits which are locally capped by thin-bedded, intensely bioturbated, hemipelagic marls which are related with temporary abandon of the channel, possibly in relation with sea level rise. Architectural elements recognised at outcrop comprehend distinct mid-channel, margin-levee and overbank complexes as well as sheets and drapes of marly basinal deposits. Channel-margin which are locally characterised by very complex depositional architectures which include also up to 15-20 m high lateral bars. Mid-channel complexes are commonly parallel to concave up stratified and locally exhibit minor order nested channel bodies. These erode, overlap or lie alongside each other and suggest repeated channel thalweg digressions and avulsions. Channel-fill architectures are locally complicated by the presence of megabreccias which include up to a few tens of metres high and wide displaced and\or tilted blocks. Megabreccias are commonly associated to sand injections and\or minor faults and resulted from channel margin collapses boosted by tectonics and\or by pore water overpressures generated in horizons hydrologically confined between early-cemented bed packages. Channel fill sequences include both carbonate- and siliciclastic-dominated deposits. Carbonate deposits are made up of rhodalgal calcirudites to calcarenites and include 5-20m thick well sorted rhodolith-rich pebbly bed packages as well as sets of early hardened strata. Siliciclastic deposits ranges from quarts- rich coarse pebbly\sandy to silty turbidites. These are well bedded, laminated or massive, and display different degrees of cementation. Carbonate fractions can be locally significant but the passage between the siliciclastic- to the carbonate-dominated deposits are commonly abrupt and marked by sharp erosive surfaces
Calcareous plankton biostratigraphy and age of the Middle Miocene deposits of Longano Formation (Eastern Matese Mountains, Southern Apennines)
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Vertebrate-fossil rich plattenkalk of Pietraroia (Southern Appennines, Italy). Evidence for submarine channel depositional setting
No full textPietraroia plattenkalk are richly fossiliferous, fine-grained cherty limestones, from the Matese Mountains - Southern Apennines, Italy, and are well known for the exceptional state of preservation of the fossils. Based on detailed thaphonomical analises, fossil assemblage recognised in the Pietraroia plattenkalk represents a taphocoenosis and an obruption deposit in the sense that most (if not all) of the animals were transported to an accumulation site from other places. A likely scenario could be represented by a depressed area in which gravitative currents carrying animals from above, capturing both the alive and the dead, deposited them into accumulation sites placed well below the original place where they lived and/or died.The Pietraroia plattenkalk sequences, on the basis of sedimentological analises and geometrical reconstructions, are here interpreted as abandon deposits of a submarine channel “Pietraroia Channel” documenting a major transgressive event. Transgression was associated with the development of suboxic to anoxic conditions at the sea-floor which favoured the preservation of fossils as well as the deposition of coprolith-rich and bituminous layers found within the plattenkalk sequences.A peculiar paleogeographic and paleotopographic setting, strongly controlled by local tectonic, saw the contiguity of wide emerged areas with a relatively deep-water channelised area where fossiliferous plattenkalk sequences were deposited
Tectonically Controlled Carbonate Channelized Slope Complexes.A Cretaceous-Miocene Case-History From The Matese Mountains (Central-Southern Apennines, Italy).
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