Benthic foraminiferal morphogroups of mid to outer shelf environments of the Late Jurassic (Prebetic Zone, southern Spain): Characterization of biofacies and environmental significance

Reolid, Matías; Rodríguez‐Tovar, Francisco J.; Nagy, Jenő; Olóriz, Federico

doi:10.1016/j.palaeo.2008.01.021

Cited by 106 publications

(54 citation statements)

References 53 publications

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“…Similarities at genus and species level can be detected when the fauna described herein is compared to AalenianBajocian faunas described in Europe (e.g. Reolid et al, 2008Reolid et al, , 2010. For instance, the species Astacolus dorbignyi, Nodosaria fontinensis, Pseudonodosaria vulgata, Lenticulina muensteri, Citharina clathrata and Eoguttulina liassica occur in the Aalenian-Bajocian GSSP of the Murtinheira section, west Portugal (Canales & Henriques, 2008.…”

Section: Foraminiferasupporting

confidence: 59%

Benthic Foraminifera and Ostracoda from the Dalichai Formation (Aalenian–Bajocian) at Telma-Dareh, Alborz Mountains, Northern Iran

Kochhann¹,

Bergue

Falahatgar

et al. 2015

Rev. bras. paleontol.

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-Aalenian-Bajocian benthic foraminiferal and ostracode assemblages of the Dalichai Formation (lithologic unit III) at Telma-Dareh, Alborz Mountains (northern Iran) are presented herein. Twenty-four foraminiferal taxa were identifi ed, with the genera Reinholdella, Epistomina and Lenticulina as the dominant taxa. The dominance of r-selected strategists among foraminifera suggests the occurrence of stressing paleoenvironmental conditions, probably related to bottom-water oxygen levels, during the deposition of the studied strata. The foraminiferal assemblages studied herein are similar to other Boreal ones in paleobiogeographic terms. The ostracode assemblages present low abundance, low species richness and poor preservation, which did not allow any identifi cation at species level. A possible record of Majungaella is briefl y discussed due to its paleozoogeographic signifi cance. Cytherella, Paracypris and Pontocyprella are the richest genera with two species each.Key words: benthic foraminifera, ostracodes, Dalichai Formation, Alborz Mountains, Iran. RESUMO -Assembleias de foraminíferos bentônicos e ostracodes do intervalo Aaleniano-Bajociano correspondentes à Formação Dalichai (unidade litológica III), em Telma-Dareh, Montanhas Alborz (norte do Irã) são aqui apresentadas. Vinte e quarto táxons de foraminíferos bentônicos foram identifi cados, sendo os gêneros Reinholdella, Epistomina e Lenticulina dominantes. O predomínio de estrategistas-r entre os foraminíferos sugere a ocorrência de condições ambientais estressantes durante a deposição destes estratos, provavelmente relacionadas aos níveis de oxigênio nas águas de fundo. As assembleias de foraminíferos aqui estudadas são similares a outras descritas para o domínio Boreal. As assembleias de ostracodes apresentam espécimes mal preservados, baixa abundância e baixa riqueza. Um possível registro de Majungaella é brevemente discutido devido ao seu signifi cado paleozoogeográfi co. Cytherella, Paracypris e Pontocyprella são os gêneros mais ricos com duas espécies registradas cada.Palavras-chave: foraminíferos bentônicos, ostracodes, Formação Dalichai, Montanhas Alborz, Irã.

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Section: Foraminiferasupporting

confidence: 59%

Benthic Foraminifera and Ostracoda from the Dalichai Formation (Aalenian–Bajocian) at Telma-Dareh, Alborz Mountains, Northern Iran

Kochhann¹,

Bergue

Falahatgar

et al. 2015

Rev. bras. paleontol.

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“…Abundant and diversified Nodosariidae (Figs. 6b, 7c, 9b) are adapted to well-oxygenated microhabitats (ranging from epifaunal to deep infaunal), and with active deposit-feeder and grazing feeding strategies (Reolid et al 2008), as confirmed by positive d 13 C carb values and a low OM content (Figs. 6,7,9).…”

Section: Palaeoecology Of Tr-j Benthic Foraminiferamentioning

confidence: 88%

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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“…This finding challenges the observations of Kaminski et al (1988), Jones (1999), Kender et al (2005), Jones (2006) and Kender et al (2008) who recorded exceptionally high abundances of agglutinated foraminifers in delta fan environments with high sedimentation rates and strong terrestrial input. The recorded rounded planispiral (Haplophragmoides, Cyclammina) and tubular unilocular (Bathysiphon) morphotypes are considered epifaunal to shallow infaunal active deposit and suspension feeders (Tyszka 1994;Van den Akker et al 2000;Kaminski et al 2005;Reolid et al 2008;Nagy et al 2009). The frequent abundance of Bathysiphon filiformis indicates a high nutrient flux of shelf-derived organic matter to the seafloor (Gooday 1993(Gooday , 1996Kaminski et al 2005;Murray 2006;Kender et al 2008).…”

Section: Interpretation and Discussionmentioning

confidence: 99%

Calcareous nannoplankton and foraminiferal response to global Oligocene and Miocene climatic oscillations: a case study from the Western Carpathian segment of the Central Paratethys

Holcová¹

2017

Geologica Carpathica

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Abstract:The reactions of foraminiferal and calcareous nannoplankton assemblages to global warming and cooling events in the time intervals of ca. 27 to 19 Ma and 13.5 to 15 Ma (Oligocene and Miocene) were studied in subtropical epicontinental seas influenced by local tectonic and palaeogeographic events (the Central Paratethys). Regardless of these local events, global climatic processes significantly influenced the palaeoenvironment within the marine basin. Warm intervals are characterized by a stable, humid climate and a high-nutrient regime, due primarily to increased continental input of phytodetritus and also locally due to seasonal upwelling. Coarse clastics deposited in a hyposaline environment characterize the marginal part of the basin. Aridification events causing decreased riverine input and consequent nutrient decreases, characterized cold intervals. Apparent seasonality, as well as catastrophic climatic events, induced stress conditions and the expansion of opportunistic taxa. Carbonate production and hypersaline facies characterize the marginal part of the basins. Hypersaline surface water triggered downwelling circulation and mixing of water masses. Decreased abundance or extinction of K-specialists during each cold interval accelerated their speciation in the subsequent warm interval. Local tectonic events led to discordances between local and global sea-level changes (tectonically triggered uplift or subsidence) or to local salt formation (in the rain shadows of newly-created mountains).

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Benthic foraminiferal morphogroups of mid to outer shelf environments of the Late Jurassic (Prebetic Zone, southern Spain): Characterization of biofacies and environmental significance

Cited by 106 publications

References 53 publications

Benthic Foraminifera and Ostracoda from the Dalichai Formation (Aalenian–Bajocian) at Telma-Dareh, Alborz Mountains, Northern Iran

Benthic Foraminifera and Ostracoda from the Dalichai Formation (Aalenian–Bajocian) at Telma-Dareh, Alborz Mountains, Northern Iran

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

Calcareous nannoplankton and foraminiferal response to global Oligocene and Miocene climatic oscillations: a case study from the Western Carpathian segment of the Central Paratethys

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