Découverte d'ammonites albiennes dans le massif apennin de la Maiella (plate-forme lazio-abruzzaise, Italie centrale): précision sur la durée du hiatus bauxitique médio-crétacé

Accarie, H.; Delamette, M.

doi:10.1016/0195-6671(91)90029-c

Cited by 5 publications

(4 citation statements)

References 3 publications

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“…A very well preserved transition between the Cretaceous platform and the adjacent basin is spectacularly exposed in central Majella, with isopic facies distribution following a W-E direction roughly perpendicular to the Pliocene fold axis. The sedimentary sequence and the stratigraphic evolution of Majella are well known owing to the existence of several biostratigraphic and sedimentological studies, in some cases accompanied by detailed field surveys (see, among many others, Crescenti et al [1969], Donzelli [1969], Accarie [1988], Vecsei [1991], and Vecsei et al [1998]). …”

Section: Deep Structure Of the Majella Massifmentioning

confidence: 99%

Structural architecture of the central Apennines: Interpretation of the CROP 11 seismic profile from the Adriatic coast to the orographic divide

et al. 2008

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We present an interpretation of the eastern half portion of the CROP 11 line, a deep reflection seismic profile 265 km long that cuts across the central Apennines from the Tyrrhenian coast to the Adriatic coast. In the study area the line cuts across a pile of thrust sheets that underwent tectonic transport between the Messinian and the Pleistocene. In its easternmost part, the line runs through the Plio‐Pleistocene deposits of the Adriatic foredeep. In the foreland region the CROP 11 line integrates previous information on the crustal structure derived from petroleum exploration and from deep seismic sounding refraction experiments. In particular, the CROP 11 line confirms the existence of a very thick sedimentary sequence underlying the Mesozoic‐Tertiary carbonates of the Apulia Platform interpreted as the Paleozoic‐Triassic sedimentary cover of a pre‐Cambrian crystalline basement. In the mountain chain, where the base thrust of the orogenic wedge reaches a depth of about 25 km, this sedimentary sequence appears to be the deepest geological unit incorporated in the thrust system. This interpretation of the CROP 11 profile suggests an unusual thin‐skin tectonic style implying the detachment from the original basement and the incorporation in the post‐Tortonian tectonic wedge of a very thick Paleozoic‐Triassic sedimentary sequence possibly affected by low‐grade metamorphism in the lower part. Other new suggestions from the CROP 11 seismic data concern the origin of the Fucino basin, one of the most remarkable Plio‐Pleistocene intramontane basins. The normal faults bordering this structural depression, as other important normal faults present in the central Apennines (e.g., the Caramanico fault system in the Majella region), seem to have been controlled by gravitational‐collapse processes driven by uplift during crustal shortening rather than by a generalized extension subsequent to the Apennine compression, as usually reported in the geological literature. If this interpretation is correct, the strong seismic activity in correspondence to the Apennine watershed may be related to the very recent increase in the structural relief caused by an out‐of‐sequence propagation of the active thrusts.

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Section: Deep Structure Of the Majella Massifmentioning

confidence: 99%

Structural architecture of the central Apennines: Interpretation of the CROP 11 seismic profile from the Adriatic coast to the orographic divide

et al. 2008

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“…The duration of this ‘mid’‐Cretaceous hiatus cannot be established in all locations due to the lack of good index fossils, but is generally from late Albian to middle/late Cenomanian (Crescenti et al ., ; Accarie & Delamette, ). Following this major unconformity, shallow‐water conditions re‐established on the platform (Crescenti et al ., ; Accarie & Delamette, ; Stössel, ; Eberli et al ., ). Rudist biostromes, sandwaves, lagoonal and peritidal sediments were accumulating in a seemingly cyclic manner forming a 250 to 300 m thick succession during the Late Cretaceous that comprises the Cima delle Murelle Formation.…”

Section: Cycle Thickness and Sea‐level Amplitudementioning

confidence: 97%

“…During this time, intense karstification of the platform created an irregular surface; bauxite is preserved locally. The duration of this ‘mid’‐Cretaceous hiatus cannot be established in all locations due to the lack of good index fossils, but is generally from late Albian to middle/late Cenomanian (Crescenti et al ., ; Accarie & Delamette, ). Following this major unconformity, shallow‐water conditions re‐established on the platform (Crescenti et al ., ; Accarie & Delamette, ; Stössel, ; Eberli et al ., ).…”

Section: Cycle Thickness and Sea‐level Amplitudementioning

confidence: 99%

The uncertainties involved in extracting amplitude and frequency of orbitally driven sea‐level fluctuations from shallow‐water carbonate cycles

Eberli

2013

Sedimentology

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In outcrops, shallow‐water carbonates often form thick, vertically stacked, metre‐scale, exposure‐bounded depositional packages, here called carbonate cycles. Because the facies within carbonate cycles can be tied precisely to water depths, they are considered ideal for reconstructing past sea‐level changes. There is, however, increasing evidence that these depositional cycles are unreliable recorders of both the frequency and the amplitude of orbitally driven sea‐level fluctuations. Carbonate cycles record only a fraction of the amplitude of a sea‐level cycle: a portion of the rise and nothing of the fall. Cores through the Pleistocene cycles on Great Bahama Bank illustrate this shortcoming. Although the amplitudes of the last nine sea‐level changes are each a hundred metres or more, the thickness of the cycles varies from a few metres to ca 15 m. The lack of correlation between sea‐level amplitude and cycle thickness is not eliminated for cycles deposited during times of lower sea‐level amplitudes, for example, the Cretaceous. Upper Cretaceous cycles on the Maiella platform margin document the irregularly filled accommodation space and the resultant variability in cycle thickness and frequency. Uncertainties in assessing the frequencies of sea‐level changes from shallow‐water carbonate cycles are caused by ‘missed beats’ and metre‐scale oscillations of sea‐level within highstands that potentially produce cycles of very short duration. The random amplitude variability during the last 57 glacio‐eustatic sea‐level changes illustrates the difficulty of assessing ‘missed beats’, where a sea‐level fluctuation is not recorded because the sea‐level rise does not reach the platform top. ‘Missed beats’ are also produced by the depositional topography that is created by irregularly filled accommodation space. As a result, variable numbers of cycles are deposited across the platform. Further complicating orbital frequency analyses are decametre‐scale oscillations of the sea‐level during highstands. The amplitude of these sub‐orbital sea‐level oscillations (up to 17 m within the last interglacial, Marine Isotope Stage 5e) are sufficient to expose shallow platforms like Great Bahama Bank and subsequently produce an additional depositional cycle with similar facies successions. The combined effects of missed beats and oscillations within highstands are likely to produce cycles and hiatuses of variable duration that are difficult to extract from the rock record. Consequently, estimates of the orbital forcing mechanisms and frequencies from ancient shallow‐water carbonate cycles carry large uncertainties.

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“…The Lower Cretaceous platform is composed of shallow‐water, mud‐rich limestone cycles (Morrone di Pacentro Formation) that extend to the marginal escarpment where they are onlapped by deep‐water deposits of the Tre Grotte Formation (Figs and ). The platform growth is interrupted from the late Albian to middle/late Cenomanian by emersion, karstification and the formation of bauxite (Crescenti et al ., ; Accarie & Delamette, ). A 5° tilt is associated with this ‘mid‐Cretaceous’ unconformity (Fig.…”

Section: Regional Settingmentioning

confidence: 99%

A Cretaceous carbonate delta drift in the Montagna della Maiella, Italy

et al. 2019

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The Upper Cretaceous (Campanian–Maastrichtian) bioclastic wedge of the Orfento Formation in the Montagna della Maiella, Italy, is compared to newly discovered contourite drifts in the Maldives. Like the drift deposits in the Maldives, the Orfento Formation fills a channel and builds a Miocene delta‐shaped and mounded sedimentary body in the basin that is similar in size to the approximately 350 km2 large coarse‐grained bioclastic Miocene delta drifts in the Maldives. The composition of the bioclastic wedge of the Orfento Formation is also exclusively bioclastic debris sourced from the shallow‐water areas and reworked clasts of the Orfento Formation itself. In the near mud‐free succession, age‐diagnostic fossils are sparse. The depositional textures vary from wackestone to float‐rudstone and breccia/conglomerates, but rocks with grainstone and rudstone textures are the most common facies. In the channel, lensoid convex‐upward breccias, cross‐cutting channelized beds and thick grainstone lobes with abundant scours indicate alternating erosion and deposition from a high‐energy current. In the basin, the mounded sedimentary body contains lobes with a divergent progradational geometry. The lobes are built by decametre thick composite megabeds consisting of sigmoidal clinoforms that typically have a channelized topset, a grainy foreset and a fine‐grained bottomset with abundant irregular angular clasts. Up to 30 m thick channels filled with intraformational breccias and coarse grainstones pinch out downslope between the megabeds. In the distal portion of the wedge, stacked grainstone beds with foresets and reworked intraclasts document continuous sediment reworking and migration. The bioclastic wedge of the Orfento Formation has been variously interpreted as a succession of sea‐level controlled slope deposits, a shoaling shoreface complex, or a carbonate tidal delta. Current‐controlled delta drifts in the Maldives, however, offer a new interpretation because of their similarity in architecture and composition. These similarities include: (i) a feeder channel opening into the basin; (ii) an excavation moat at the exit of the channel; (iii) an overall mounded geometry with an apex that is in shallower water depth than the source channel; (iv) progradation of stacked lobes; (v) channels that pinch out in a basinward direction; and (vi) smaller channelized intervals that are arranged in a radial pattern. As a result, the Upper Cretaceous (Campanian–Maastrichtian) bioclastic wedge of the Orfento Formation in the Montagna della Maiella, Italy, is here interpreted as a carbonate delta drift.

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Découverte d'ammonites albiennes dans le massif apennin de la Maiella (plate-forme lazio-abruzzaise, Italie centrale): précision sur la durée du hiatus bauxitique médio-crétacé

Cited by 5 publications

References 3 publications

Structural architecture of the central Apennines: Interpretation of the CROP 11 seismic profile from the Adriatic coast to the orographic divide

Structural architecture of the central Apennines: Interpretation of the CROP 11 seismic profile from the Adriatic coast to the orographic divide

The uncertainties involved in extracting amplitude and frequency of orbitally driven sea‐level fluctuations from shallow‐water carbonate cycles

A Cretaceous carbonate delta drift in the Montagna della Maiella, Italy

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