1,721,024 research outputs found
Barremian-Aptian shallow-water carbonates of Monte Faito (Sorrento Peninsula, southern Italy). Microstratigraphy, cyclostratigraphy and sequence stratigraphy
No full textForaminifera diversity changes and paleoenvironmental analysis. The Lower Cretaceous shallow-water carbonates of San Lorenzello, Campanian Apennines, southern Italy
No full textA high-resolution stratigraphic study, carried out on the carbonate platform strata of the San Lorenzello section (Matese Mountains, southern Italy), Valanginian-Hauterivian in age, has allowed to: recognize lithofacies and their associations; assign the lithofacies associations to specific environments and individuate early meteoric diagenetic modifications, recurring at specific horizons. In this frame the vertical variation of benthic foram diversity has been analyzed. On the whole, foraminiferal genera diversity decreases from open to restricted marine environments. Moreover, a climatic control on carbonate sedimentation is suggested by a Milankovitch cyclicity organized in elementary cycles, bundles and superbundles as well as by diagenetic characteristics testifying that humid and arid conditions alternated during the Early Cretaceous times.
The orbital cyclicity is also documented by foraminiferal diversity changes, even if some discrepancies between the lithofacies and the diversity locally occur. Therefore, the above diversity changes do not appear to provide sufficient information for the sequence-stratigraphic interpretation of shallow-water carbonates
Analisi dei dati nell’ambito del Progetto: Scenari di rischio di erosione delle coste campane e relativi modelli
No full textBarremian-Aptian shallow-water carbonate of Monte Faito (Sorrento Peninsula, southern Italy). Record of bio-sedimentary rhythmicity? Preliminary results
No full textDinamica sedimentaria di un sistema di piattaforma carbonatica di tipo rampa. Il Barremiano-Aptiano della carota Agip S. Maria 4, Italia centrale
No full textStratigrafia di alta risoluzione e ciclostratigrafia dei carbonati neritici. Pozzo Agip S. Maria 4 (Appennino centrale)
No full textWavelet application to cyclostratigraphy signals. The San Lorenzello section, Lower Cretaceous, Italy
No full textA contribution to the Barremian and Aptian geochronology from orbital chronostratigraphy of shallow-marine carbonates
No full textRilievi morfologici sottomarini nell'ambito di uno studi costiero nel Golfo di Napoli e Salerno
No full textThe Barremian-Aptian shallow-marine carbonates of Monte Faito and of Santa Maria bore cores (central-southern Apennines, Italy). Regional correlation based on cyclostratigraphy
No full textIn the last twenty years, high-resolution (cm scale) studies of several Cretaceous carbonate platform successions in central-southern Italy have demonstrated that they carry clear evidence of astronomically controlled eustatic oscillations reflected on their hierarchical stacking patterns (elementary cycles, bundles and superbundles) and exhibit a sequence-stratigraphic configuration, that is well evident in their superbundles (long eccentricity cycles) as well as in the composite mode of their aggradational pattern, laterally consistent also at more than 100 km distance.
Here are presented the centimetre-scale facies analysis of the S. Maria 6 and 4 Agip bore cores (east of Maiella Mountain, Abruzzi region, Early Barremian- Late Aptian in age) and of the Monte Faito section (Monti Lattari, Campania Region, Barremian – Early Aptian in age). Taking into account the cyclic stacking patterns of the lithofacies and their grouping as well as of the early diagenetic features, the environmental oscillations have been constrained in well defined time intervals, typical of the Milankovitch periodicities (from ≈ 20 to ≈ 400ky).
Based on cyclostratigraphy and sequence stratigraphy criteria and using appropriate biostratigraphic, isotopic and paleomagnetic markers, high-resolution physical correlations (precision 100 ky) have been traced at regional scale among S. Maria composite core, Monte Faito and the previous studied Monte Raggeto (Monte Maggiore) sections. A chronostratigraphic diagram has been assembled for each of the above sections showing that bundles may be locally missing. Moreover, a Barremian-Aptian composite orbital chronostratigraphy has been assembled suggesting the minimum time duration recorded in the considered interval, so that a regional sea-level oscillations history may be restored with a precision of ≤400 ky. On these bases, a minimum duration of 5.2 my for the Barremian interval (13 superbundles) has been estimated, close to the 5 my calculated for the whole Barremian from OGG et alii (2008). These results show as cyclostratigraphy of carbonate platform sequences, integrated with other stratigraphic methodologies and high-precision long distance correlations, is a valid tool to assemble a “floating” orbital time scale
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