Palaeoceanographic and palaeoclimatic reorganization around the Middle–Late Jurassic transition

Rais, Pauline; Louis-Schmid, Beat; Bernasconi, Stefano M.; Weissert, Helmut

doi:10.1016/j.palaeo.2007.05.008

Cited by 83 publications

(39 citation statements)

References 41 publications

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“…By the Callovian-Oxfordian transition between there was a major paleoceanographic and paleoclimate reorganization (Rais et al, 2007) coincident with a large drop of the eustatic sea level, exposure and unconformity (Leinfelder & Wilson 1998;Kullberg et al, 2014) and associated with the CallovianOxfordian Atlantic Regressive Event. That condition created an ephemeral land bridge that presented a temporary opportunity for probably terrestrial gateways through the landmasses Flemish Cap and Galician Bank, so that large dinosaur could cross the northern proto-Atlantic in both directions.…”

Section: Paleogeographymentioning

confidence: 99%

The Lourinhã Formation: the Upper Jurassic to lower most Cretaceous of the Lusitanian Basin, Portugal – landscapes where dinosaurs walked

2017

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This work, as a fieldtrip guide, aims to provide a glimpse into the palaeoenvironments, palaeontology, and diagenesis of one of the most productive areas for Late Jurassic dinosaurs and other vertebrates in Europe, namely, the sites of the Lourinhã Formation, which is coeval with the Morrison Formation of the midwest USA.The Late Jurassic rifting phase of the Lusitanian Basin created several sub-basins separated by major crustal faults. In the western and central areas of the basin, the Caldas da Rainha structure separates three sub-basins with different subsidence and infill characteristics (Consolação to the west, Bombarral-Alcobaça to the northeast, and Turcifal to the southeast). The Upper Jurassic-lowermost Cretaceous succession exposed in the coastal cliffs located between Nazaré and Santa Cruz belongs to the Consolação Sub-basin, whereas the coastal outcrops between Santa Cruz and Ericeira show units of the Turcifal Sub-basin.To place the stops into a coherent context, selected units of the fieldtrip area are detailed. The stratigraphy of the Upper Jurassic of the Lusitanian Basin is quite complex, and no fully accepted overall proposal exists. Thus, a review of lithostratigraphy, sedimentology, age and environmental interpretations is presented. Interpretations of palaeoclimate, palaeogeography, and taphonomy contribute to establishing an overview of the landscape where dinosaurs lived and to understanding the conditions for their fossilization and preservation. This trip, which takes place from north to south, focuses on the vertebrate content, sedimentology, and stratigraphy of the deposits. The first stop at Consolação examines the upper Kimmeridgian shallow-marine to deltaic Alcobaça Formation, which underlies the Lourinhã Formation. Further south, the Paimogo fort cape gives a scenic view of the Lourinhã Formation: to the north, the Praia da Amoreira and Porto Novo members (lower coastal plain alluvium, including distal fan and meandering fluvial systems; upper Kimmeridgian), and, to the south, the Praia Azul Member (lower coastal plain alluvium with three brackish-marine faunally distinct transgressive carbonate levels; uppermost Kimmeridgian to lowermost Tithonian). In Paimogo, we visit sites where dinosaur eggs and a sauropod skeleton have been found. The stop at the Museum of Lourinhã allows a visit to one of the most important collections of Late Jurassic vertebrates in Europe. The last fieldtrip stop at Porto da Calada examines the top of the Assenta Member of the Lourinhã Formation (meandering fluvial system with intercalations of shallow-marine lagoonal carbonates; upper Tithonian to lowermost Berriasian) and the Porto da Calada Formation (meandering fluvial system with thin levels of estuarine and intertidal flats carbonates; Berriasian) and thus includes the Jurassic-Cretaceous boundary.Keywords: Upper Jurassic, Lourinhã Formation, Portugal, Lusitanian Basin, Dinosaurs ResumoEste trabalho, como um guião de campo, visa dar uma visão sobre os paleoambientes, paleontologia e diagénese...

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Section: Paleogeographymentioning

confidence: 99%

The Lourinhã Formation: the Upper Jurassic to lower most Cretaceous of the Lusitanian Basin, Portugal – landscapes where dinosaurs walked

2017

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“…Indeed through the Late JurassicEarly Cretaceous transition elevated rates of carbonate burial and preservation are observed (e.g., Mackenzie and Morse, 1992;Berner and Mackenzie, 2011). For example, during the Late Jurassic carbonate sedimentation became dominant over wide parts of the northern Tethys (Rais et al, 2007), with the expansion and development of new reef sites (Leinfelder et al, 2002;Cecca et al, 2005).…”

mentioning

confidence: 99%

Carbon cycle history through the Jurassic–Cretaceous boundary: A new global δ13C stack

Price

Főzy

Pálfy

2016

Palaeogeography, Palaeoclimatology, Palaeoecology

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We present new carbon and oxygen isotope curves from sections in the Bakony Mts. (Hungary), constrained by biostratigraphy and magnetostratigraphy in order to evaluate whether carbon isotopes can provide a tool to help establish and correlate the last system boundary remaining undefined in the Phanerozoic as well provide data to better understand the carbon cycle history and environmental drivers during the Jurassic-Cretaceous interval. We observe a gentle decrease in carbon isotope values through the Late Jurassic. A pronounced shift to more positive carbon isotope values does not occur until the Valanginian, corresponding to the Weissert event. In order to place the newly obtained stable to relatively stable δ 13 C values, compounded by a slope which is too slight. There is no clear isotopic marker event for the system boundary. The long-term gradual change towards more negative carbon isotope values through the Jurassic-Cretaceous transition has previously been explained by increasingly oligotrophic condition and lessened primary production. However, this contradicts the reported increase in 87 Sr/ 86 Sr ratios suggesting intensification of weathering (and a decreasing contribution of non-radiogenic hydrothermal Sr) and presumably a concomitant rise in nutrient input into the oceans.The concomitant rise of modern phytoplankton groups (dinoflagellates and coccolithophores) would have also led to increased primary productivity, making the negative carbon isotope trend even more notable. We suggest that gradual oceanographic changes, more effective connections and mixing between the Tethys, Atlantic and Pacific Oceans, would have promoted a shift towards enhanced burial of isotopically heavy carbonate carbon and effective recycling of isotopically light organic matter.These processes account for the observed long-term trend, interrupted only by the Weissert event in the Valanginian.

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“…Brooks & Fleet 1987, Huc ed. 1995, Summerhayes et al 1995, De Wever & Baudin 1996, Rais et al 2007, Golonka et al 2009). This is because upwelling zones are rich in dissolved nutrients necessary to sustain high organic productivity.…”

Section: Fig 10 Plot Of Hydrogen Index (Hi) Versus Temperature Tmaxmentioning

confidence: 99%

Potential source rocks in the Ropianka Formation of the Magura Nappe (Outer Carpathians, Poland) – geochemical and foraminiferal case study

Waśkowska

Golonka

Machowski

et al. 2018

geol

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Abstract:To optimize exploration for new hydrocarbon accumulations in the Polish Outer Carpathians, it is necessary to concentrate attention on identification of hydrocarbon accumulations of the "shale-gas" type. Results of recently completed analysis suggested new such possible targets in the Magura Basin, preserved in the Outer Carpathian Magura Nappe. Analysis of the preliminary results of paleoenvironmental and geochemical studies of these shales is the subject of this paper. Micropaleontological and geochemical study was conducted on the 300 m thick Świątkowa Member, the uppermost part of the Ropianka Formation located in the external, northernmost Siary Zone. This member is composed of thin-and medium-bedded sandstones interbedded by green, brown, black and dark-gray shales. Poor and changeable oxygenation is reflected in the composition of foraminiferal assemblages. A negative correlation between the TOC content and numbers and diversity of foraminifera is observed. The paleogeographic position and paleoenvironment assessment indicates that the Siary Zone fulfills certain conditions for organic productivity and preservation during the deposition of the Ropianka Formation.

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Palaeoceanographic and palaeoclimatic reorganization around the Middle–Late Jurassic transition

Cited by 83 publications

References 41 publications

The Lourinhã Formation: the Upper Jurassic to lower most Cretaceous of the Lusitanian Basin, Portugal – landscapes where dinosaurs walked

The Lourinhã Formation: the Upper Jurassic to lower most Cretaceous of the Lusitanian Basin, Portugal – landscapes where dinosaurs walked

Carbon cycle history through the Jurassic–Cretaceous boundary: A new global δ13C stack

Potential source rocks in the Ropianka Formation of the Magura Nappe (Outer Carpathians, Poland) – geochemical and foraminiferal case study

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