Sedimentary and biological response to sea-level and palaeoceanographic changes of a Lower–Middle Jurassic Tethyan platform margin (Southern Alps, Italy)

Cobianchi, Miriam; Picotti, Vincenzo

doi:10.1016/s0031-0182(01)00217-6

Cited by 71 publications

(75 citation statements)

References 34 publications

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“…Jenkyns 1971) and more recently the role of palaeoceanographic factors, mainly affecting trophic resources and thus the composition of faunal assemblages, has been evidenced (e.g. Cobianchi and Picotti 2001). Even though the encrinites of the study area do not overlie peritidal limestones as in the case of cited examples from the Southern Alps or Sicily (see also Masetti and Bottoni 1978;Di Stefano et al 2002), the crinoidal facies documents a sharp change from very low energy, nearly barren shallow-water settings to open marine, well agitated and oxygenated environments.…”

Section: Calcari DI Val Tanarellomentioning

confidence: 99%

Middle-Late Jurassic syndepositional tectonics recorded in the Ligurian Briançonnais succession (Marguareis–Mongioie area, Ligurian Alps, NW Italy)

et al. 2011

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The Middle-Upper Jurassic succession of the Marguareis-Mongioie area (Ligurian Briançonnais Domain), developed in a protected shelf environment evolving into a pelagic plateau, bears clear evidence of synsedimentary tectonics such as: growth fault-related structures; neptunian dykes; marked lateral variations in stratigraphic thicknesses testifying to the juxtaposition of sectors characterized by different sedimentation and subsidence rates; discordant, anomalous stratigraphic contacts corresponding to paleoescarpments; nodular beds showing evidence of fluidification interpreted as seismites; and the occurrence of sand-sized quartz grains pointing to denudation of Permo-Triassic quartz-rich rocks. Such evidence documents an important Middle-Late Jurassic post-breakup tectonic activity, which was more effective in controlling the basin topography than the Early Jurassic syn-rift tectonic phase. Two main tectonosedimentary stages, one occurring during the Bathonian, the other falling within the Callovian-Kimmeridgian interval, were reconstructed. The first stage can be referred to a faultrelated activity occurring shortly after the initial stages of oceanic spreading of the Ligurian Tethys; the second can be genetically related to the far effects of the first rifting stage of the Bay of Biscay and the Valais basin.

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Section: Calcari DI Val Tanarellomentioning

confidence: 99%

Middle-Late Jurassic syndepositional tectonics recorded in the Ligurian Briançonnais succession (Marguareis–Mongioie area, Ligurian Alps, NW Italy)

et al. 2011

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“…13 b-5), this being more remarkable at the Mediterranean province than in the Boreal realm. In spite of it cannot be consi dered as an extinction event, Cobianchi and Picotti (2001) and Erba (2004) reported a general crisis decline of the phytoplankton schizosphaerellids in Northern Italy around the Pliensbachian-Toarcian boundary, which reaches a maximum around the Tenuicostatum Serpentinum zonal boundary in Northern Spain (Tre molada et al, 2005 ).…”

Section: Timing Of the Early Toarcian Mass Extinctionmentioning

confidence: 99%

Seawater temperature and carbon isotope variations in belemnites linked to mass extinction during the Toarcian (Early Jurassic) in Central and Northern Spain. Comparison with other European sections

Gómez

Goy

Canales

2008

Palaeogeography, Palaeoclimatology, Palaeoecology

160

125

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“…11d-f). Schizosphaerella prevails in carbonate-rich sediments and is interpreted as a nannolith that preferentially inhabited proximal environments (Noël et al 1994;Mattioli 1997;Cobianchi and Picotti 2001;Mattioli and Pittet 2004). Two hypotheses have been proposed to explain the palaeoecological preferences of Schizosphaerella: (1) an oligotrophic, deep-dwelling habitat (Claps et al 1995;Erba 2004;Tremolada et al 2005) or (2) a mesotrophic shallow-dwelling habitat (Mattioli and Pittet 2004).…”

Section: Palaeoecology Of Late Triassic Calcareous Nannofossilsmentioning

confidence: 99%

Bentho-planktonic evidence from the Austrian Alps for a decline in sea-surface carbonate production at the end of the Triassic

et al. 2010

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A high-resolution micropalaeontological study, combined with geochemical and sedimentological analyses was performed on the Tiefengraben, Schlossgraben and Eiberg sections (Austrian Alps) in order to characterize sea-surface carbonate production during the end-Triassic crisis. At the end-Rhaetian, the dominant calcareous nannofossil Prinsiosphaera triassica shows a decrease in abundance and size and this is correlated with a increase in d 18 O and a gradual decline in d 13 C carb values. Simultaneously, benthic foraminiferal assemblages show a decrease in diversity and abundance of calcareous taxa and a dominance of infaunal agglutinated taxa. The smaller size of calcareous nannofossils disturbed the vertical export balance of the biological carbon pump towards the seabottom, resulting in changes in feeding strategies within the benthic foraminiferal assemblages from deposit feeders to detritus feeders and bacterial scavengers. These micropalaeontological data combined with geochemical proxies suggest that changes in seawater chemistry and/or cooling episodes might have occurred in the latest Triassic, leading to a marked decrease of carbonate production. This in turn culminated in the quasi-absence of calcareous nannofossils and benthic foraminifers in the latest Triassic. The aftermath (latest Triassic earliest Jurassic) was characterised by abundance peaks of ''disaster'' epifaunal agglutinated foraminifera Trochammina on the sea-floor. Central Atlantic Magmatic Province (CAMP) paroxysmal activity, superimposed on a major worldwide regressive phase, is assumed to be responsible for a deterioration in marine palaeoenvironments. CAMP sulfuric emissions might have been the trigger for cooling episodes and seawater acidification leading to disturbance of the surface carbonate production at the very end-Triassic.

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Sedimentary and biological response to sea-level and palaeoceanographic changes of a Lower–Middle Jurassic Tethyan platform margin (Southern Alps, Italy)

Cited by 71 publications

References 34 publications

Middle-Late Jurassic syndepositional tectonics recorded in the Ligurian Briançonnais succession (Marguareis–Mongioie area, Ligurian Alps, NW Italy)

Middle-Late Jurassic syndepositional tectonics recorded in the Ligurian Briançonnais succession (Marguareis–Mongioie area, Ligurian Alps, NW Italy)

Seawater temperature and carbon isotope variations in belemnites linked to mass extinction during the Toarcian (Early Jurassic) in Central and Northern Spain. Comparison with other European sections

Bentho-planktonic evidence from the Austrian Alps for a decline in sea-surface carbonate production at the end of the Triassic

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