The Loppio Oolitic Limestone (Early Jurassic, Southern Alps): A prograding oolitic body with high original porosity originated by a carbonate platform crisis and recovery

Preto, Nereo; Breda, Anna; Corso, Jacopo Dal; Franceschi, Michel; Rocca, Filippo Della; Spada, C.; Roghi, Guido

doi:10.1016/j.marpetgeo.2016.10.027

Cited by 20 publications

(13 citation statements)

References 49 publications

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“…These shallow water carbonate environments experienced important architectural and compositional changes in a context of rifting related with the break-up of Pangea and associated with important circulation, environmental changes and an eustatic sea-level rise (e.g. Zempolich 1993;Ruiz-Ortiz et al 2004;Massetti et al 2016;Preto et al 2017;Rychlinski et al 2018;Franceschi et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Lower Jurassic benthic foraminiferal assemblages from shallow-marine platform carbonates of Mallorca (Spain): stratigraphic implications

Sevillano¹,

Septfontaine²,

Rosales³

et al. 2019

J Iber Geol

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The stratigraphic distribution of larger benthic foraminifera and other microfossils recognizable in thin sections has been investigated in three stratigraphic profiles (Son Maina, S'Heretat and Cuevas de Artà) along the Lower Jurassic shallow-water carbonate platform succession (Es Barraca Member) of the Llevant Mountains in the Mallorca Island. Here, the microfossil assemblage contains abundant benthic foraminifera and calcareous algae, including the microproblematic Thaumatoporella parvovesiculifera (Raineri) and the typical Liassic species Palaeodasycladus mediterraneus (Pia), which has allowed a better age constraint of the succession. Four consecutive biozones (scheme of Septfontaine 1984) have been recognized based on the stratigraphic distribution of imperforate foraminifera, which are documented by the first time in the Balearic Basin: Biozone A (interval Zone) is characterized by the occurrence of small Siphovalvulina sp. and Mesoendothyra sp. and some Lituosepta ancestors. Biozone B (lineage Zone), whose base is marked by the first occurrence of L. recoarensis Cati and the top by the first appearance of primitive forms of Orbitopsella. Biozone B/C1 transition, characterized by the presence of very primitive forms of Orbitopsella. Finally, Biozone C1 (lineage Zone) marked by the first occurrence of Orbitopsella aff. primaeva (Henson) but still with L. recoarensis. This distribution of foraminiferal zones is consistent with a Sinemurian age for the Es Barraca Member, with its top very unlikely penetrating into the Pliensbachian. The proposed biostratigraphic scheme is comparable with those established for other western Tethyan margins such the High Atlas of Morocco and the Betic Cordillera in southern Spain. The reconstruction of the depositional transect across these profiles shows the progressive lost of the upper biozones towards the northeast, evidencing the existence of significant hiatuses in some sections of the Llevant Mountains domain, and allowing to infer an intra-Pliensbachian early stage of platform fragmentation and erosion, or alternatively non-deposition, probably coeval with progradation of deltaic siliciclastics to the northwest part of the Mallorca island. The new biostratigraphic data presented here highlights the need to review and clarify the current stratigraphic scheme established for the Lower Jurassic of Mallorca.

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Section: Introductionmentioning

confidence: 99%

Lower Jurassic benthic foraminiferal assemblages from shallow-marine platform carbonates of Mallorca (Spain): stratigraphic implications

Sevillano¹,

Septfontaine²,

Rosales³

et al. 2019

J Iber Geol

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“…Also, in the immediate aftermath of the Mid‐Sinemurian carbon‐cycle perturbation, oolites prograded across a wide swathe of the Trento Platform (Preto et al. , 2017). As such, the Western Tethys ‘ooid proliferation’ following the T‐OAE is interpreted to reflect the continued suppression of skeletal carbonate production ( sensu Payne et al.…”

Section: Discussionmentioning

confidence: 99%

“…Another example is widespread oolite deposition in close stratigraphic proximity to the Wenlock-Ludlow extinction intervals of Sweden during a period otherwise characterized by a deficiency of ooids (Groves & Calner, 2004). Also, in the immediate aftermath of the Mid-Sinemurian carbon-cycle perturbation, oolites prograded across a wide swathe of the Trento Platform (Preto et al, 2017). As such, the Western Tethys 'ooid proliferation' following the T-OAE is interpreted to reflect the continued suppression of skeletal carbonate production (sensu Payne et al, 2006;Lehrmann et al, 2012).…”

Section: Ooid Proliferationmentioning

confidence: 99%

Ocean acidification and photic‐zone anoxia at the Toarcian Oceanic Anoxic Event: Insights from the Adriatic Carbonate Platform

et al. 2020

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Severe global climate change led to the deterioration of environmental conditions in the oceans during the Toarcian Stage of the Jurassic. Carbonate platforms of the Western Tethys Ocean exposed in Alpine Tethyan mountain ranges today offer insight into this period of environmental upheaval. In addition to informing understanding of climate change in deep time, the effect of ancient carbon cycle perturbations on carbonate platforms has important implications for anthropogenic climate change; the patterns of early Toarcian environmental deterioration are similar to those occurring in modern oceans. This study focuses on the record of the early Toarcian Oceanic Anoxic Event (ca 183.1 Ma) in outcrops of the northwest Adriatic Carbonate Platform in Slovenia. Amidst environmental deterioration, the northwest Adriatic Platform abruptly transitioned from a healthy, shallow-water environment with diverse metazoan ecosystems to a partially drowned setting with low diversity biota and diminished sedimentation. An organic carbon-isotope excursion of −2.2‰ reflects the massive injection of CO 2 into the ocean-atmosphere system and marks the stratigraphic position of the Toarcian Oceanic Anoxic Event. A prominent dissolution horizon and suppressed carbonate deposition on the platform are interpreted to reflect transient shoaling of the carbonate compensation depth to unprecedentedly shallow levels as the dramatic influx of CO 2 overwhelmed the ocean's buffering capacity, causing ocean acidification. Trace metal geochemistry and palaeoecology highlight water column deoxygenation, including the development of photic-zone anoxia, preceding and during the Toarcian Oceanic Anoxic Event. Ocean acidification and reduced oxygen levels likely had a profoundly negative effect on carbonate-producing biota and growth of the Adriatic Platform. These effects are consistent with the approximate doubling of the concentration of CO 2 in the ocean-atmosphere system from pre-event levels, which has previously been linked to a volcanic triggering mechanism. Mercury enrichments discovered in this study support a temporal and genetic link between volcanism, the Toarcian Oceanic Anoxic Event and the carbonate crisis.

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“…Carbonates from the shallow marine environment developed extensively in the residual basins of the Middle Atlas during the Eocene. These shallow water carbonate environments have undergone significant changes, in platform architecture and sediment composition in the context of tectonic remobilization induced splitting, associated with significant ocean circulation and environmental changes, accompanied by sea-level rise (Masetti et al 2016;Solak et al, 2017;Preto et al, 2017;Rychlinski et al, 2018;Franceschi et al 2019). These events also coincided with the faunal recovery.…”

Section: The Carbonate Succession Of the Bekrit-timahdite Formation Imentioning

confidence: 99%

The Eocene Bryozoans of Bekrit-Timahdite Formation, Middle-Atlas, Morocco: Taxonomy, Paleoenvironments and Paleoclimates Implications

Attmani¹,

Bouwafoud²,

Elouariti³

et al. 2021

GEP

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Located in the NorthWest of the African continent, the Moroccan Middle Atlas constitutes an intra-continental chain within the Atlas domain. It is known by several global geological events such as the Paleocene-Eocene crisis during the Paleogene, which corresponds to one of the hottest periods on earth with Paleocene-Eocene thermal maximum (PETM). A taxonomic study carried out on the carbonate deposits of the Bekrit-Timahdite Formation from three sections of the Bekrit syncline allowed the identification of 5 species of the Cheilostome and Cyclostome Bryozoans (Cellaria rigida, Cellaria sinuosa, Aimulosia lamellosa, Heteropora and Osthimosia) in bioclastic limestones, nodular limestones, marly and sandy limestones. The interest of Bryozoans as indicators of paleoenvironments and paleoclimates was assessed by examining current communities, in terms of depth evolution as richness and abundance, distribution of taxonomic categories zoarium types, and zooidal morphology. The depositional environment analysis of Bryozoans showed a shallow marine carbonate platform with low sedimentation energy where is registered a relatively warm paleoclimate.

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The Loppio Oolitic Limestone (Early Jurassic, Southern Alps): A prograding oolitic body with high original porosity originated by a carbonate platform crisis and recovery

Cited by 20 publications

References 49 publications

Lower Jurassic benthic foraminiferal assemblages from shallow-marine platform carbonates of Mallorca (Spain): stratigraphic implications

Lower Jurassic benthic foraminiferal assemblages from shallow-marine platform carbonates of Mallorca (Spain): stratigraphic implications

Ocean acidification and photic‐zone anoxia at the Toarcian Oceanic Anoxic Event: Insights from the Adriatic Carbonate Platform

The Eocene Bryozoans of Bekrit-Timahdite Formation, Middle-Atlas, Morocco: Taxonomy, Paleoenvironments and Paleoclimates Implications

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