The continental margin of the Mesozoic Tethys in the Western Alps

Lemoine, Maël; Bas, Thierry; Arnaud‐Vanneau, Annie; Arnaud, Hubert; Dumont, Thierry; Gidon, M.; Bourbon, Maurice; Graciansky, Pierre-Charles De; Rudkiewicz, Jean-Luc; Megard-Galli, J.; Tricart, Pierre

doi:10.1016/0264-8172(86)90044-9

Cited by 325 publications

(249 citation statements)

References 5 publications

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“…As expected, the interplay between the paleogeography and the carbon cycle results in a large CO 2 consumption between the most assembled case, the Triassic times, and the most dispersed case, the Cretaceous times. But, an unexpected outcome emerged: the moderate northward drifting of the Pangea and the initiation of the breakup (i.e., Pre-to Syn-Rift phases of western Tethyan continental margins) [Lemoine et al, 1986] induce important changes in atmospheric general circulation that lead to a large CO 2 drawdown between the Triassic and the Jurassic.…”

Section: Consequences Of the Pangea Breakup On The Global Carbon Cyclementioning

confidence: 99%

A GEOCLIM simulation of climatic and biogeochemical consequences of Pangea breakup

Donnadieu¹,

Goddéris

Pierrehumbert

et al. 2006

Geochem Geophys Geosyst

128

127

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[1] Large fluctuations in continental configuration occur throughout the Mesozoic. While it has long been recognized that paleogeography may potentially influence atmospheric CO 2 via the continental silicate weathering feedback, no numerical simulations have been done, because of the lack of a spatially resolved climate-carbon model. GEOCLIM, a coupled numerical model of the climate and global biogeochemical cycles, is used to investigate the consequences of the Pangea breakup. The climate module of the GEOCLIM model is the FOAM atmospheric general circulation model, allowing the calculation of the consumption of atmospheric CO 2 through continental silicate weathering with a spatial resolution of 7.5°long Â 4.5°lat. Seven time slices have been simulated. We show that the breakup of the Pangea supercontinent triggers an increase in continental runoff, resulting in enhanced atmospheric CO 2 consumption through silicate weathering. As a result, atmospheric CO 2 falls from values above 3000 ppmv during the Triassic down to rather low levels during the Cretaceous (around 400 ppmv), resulting in a decrease in global mean annual continental temperatures from about 20°C to 10°C. Silicate weathering feedback and paleogeography both act to force the Earth system toward a dry and hot world reaching its optimum over the last 260 Myr during the Middle-Late Triassic. In the super continent case, given the persistent aridity, the model generates high CO 2 values to produce very warm continental temperatures. Conversely, in the fragmented case, the runoff becomes the most important contributor to the silicate weathering rate, hence producing a CO 2 drawdown and a fall in continental temperatures. Finally, another unexpected outcome is the pronounced fluctuation in carbonate accumulation simulated by the model in response to the Pangea breakup. These fluctuations are driven by changes in continental carbonate weathering flux. Accounting for the fluctuations in area available for carbonate platforms, the simulated G 3

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Section: Consequences Of the Pangea Breakup On The Global Carbon Cyclementioning

confidence: 99%

A GEOCLIM simulation of climatic and biogeochemical consequences of Pangea breakup

Donnadieu¹,

Goddéris

Pierrehumbert

et al. 2006

Geochem Geophys Geosyst

128

127

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“…Mesozoic sedimentary sequences pinched within that accident attest of the alpine age of this accident [4]. Local reactivations of primary magmatic contacts between the granites and their host rocks occur first during the Liassic extension event [16] and are inverted during the alpine orogeny (figure IV).…”

Section: The Turbat Etages and Berarde Granitesmentioning

confidence: 99%

Modélisation géométrique 3D des granites stéphaniens du massif du Pelvoux (Alpes, France)

Strzerzynski

Guillot

Courrioux

et al. 2005

Comptes Rendus. Géoscience

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International audienceThe structural analysis and the 3D modelling of Stephanian granites of the Pelvoux Massif characterize an emplacement along sinistral NW–SE- and dextral NE–SW-trending shear zones in the Pelvoux and in the Aiguilles Rouges–Mont Blanc Massifs, respectively. This Carboniferous shear system is consistent with a north–south extension direction known in the whole Variscan belt at this tim

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“…-Lowermost Liassic (early to middle Hettangian) transgressive platform carbonates grade upwards into thick early Liassic to Middle Jurassic hemipelagic marls and limestones. These latter formations are coeval with repeated stages of extensional faulting (Chevalier et al, 2003;Domergues et al, in press), and show important thickness and facies changes due to differential subsidence (Lemoine et al, 1986;Dumont, 1998). …”

mentioning

confidence: 99%

Structural and sedimentary records of the Oligocene revolution in the Western Alpine arc

Dumont

Schwartz

Guillot

et al. 2012

Journal of Geodynamics

100

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The continental margin of the Mesozoic Tethys in the Western Alps

Cited by 325 publications

References 5 publications

A GEOCLIM simulation of climatic and biogeochemical consequences of Pangea breakup

A GEOCLIM simulation of climatic and biogeochemical consequences of Pangea breakup

Modélisation géométrique 3D des granites stéphaniens du massif du Pelvoux (Alpes, France)

Structural and sedimentary records of the Oligocene revolution in the Western Alpine arc

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