The Jurassic (Pliensbachian to Kimmeridgian) palynology of the Algarve Basin and the Carrapateira outlier, southern Portugal

Borges, Marisa; Riding, James B.; Fernandes, Paulo; Pereira, Zélia

doi:10.1016/j.revpalbo.2010.09.006

Cited by 28 publications

(24 citation statements)

References 36 publications

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“…Moreover, the genus Valvaeodinium, which is present elsewhere in the Northern Hemisphere, is entirely absent. Unfortunately, the nearby Algarve Basin of southern Portugal, which is within the Submediterranean Province of the Tethyan Realm (Azerêdo et al, 2003), has not yielded any marine palynomorphs from the Lower Jurassic (Borges et al, 2011).…”

Section: Comparison Of the Lusitanian Basin Marine Palynofloras With mentioning

confidence: 99%

The palynology of the lower and middle Toarcian (Lower Jurassic) in the northern Lusitanian Basin, western Portugal

Correia

Riding

Fernandes

et al. 2017

Review of Palaeobotany and Palynology

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Section: Comparison Of the Lusitanian Basin Marine Palynofloras With mentioning

confidence: 99%

The palynology of the lower and middle Toarcian (Lower Jurassic) in the northern Lusitanian Basin, western Portugal

Correia

Riding

Fernandes

et al. 2017

Review of Palaeobotany and Palynology

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“…The low-diversity dinoflagellate cyst assemblage is typical of other Kimmeridgian Portuguese biotas (e.g., Borges et al 2011). Assemblages from further north in Europe have markedly higher diversities (i.e., Riding and Thomas 1988).…”

Section: Depositional Environmentmentioning

confidence: 99%

The age of the Tojeira Formation (Late Jurassic, Early Kimmeridgian), of Montejunto, west-central Portugal

et al. 2017

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Precise biostratigraphic dating of the Tojeira Formation (Late Jurassic, Early Kimmeridgian) of the Montejunto section of west-central Portugal, which has yielded important planktonic foraminiferal assemblages, is hindered by poor preservation in the upper part of the section as the lithology shifts from shale to coarser clastics. Assignment was previously made to the Idoceras planula and Sutneria platynota zones based on ammonites. Coccolith and dinoflagellate assemblages described here concur with the Early Kimmeridgian, yet, a finer age constraint is proposed by cyclo-and chemostratigraphical correlation. Peaks in d 13 C org and TOC, if equivalent to maxima in the envelope of clay/carbonate cycles in SE France, imply that the c. 50 m-thick section spans a 0.8-myr interval of the S. platynota through upper Ataxioceras hypselocyclum ammonite zones, with the approximate base of the A. hypselocyclum Zone at c. 15.4 m (level 13). Such stratigraphy provides new insights into the upper part of the formation by interbasinal correlation with other Tethyan records. An extended first occurrence of the dinoflagellate species Dichadogonyaulax? pannea in the S. platynota Zone is also proposed.

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“…The assemblages increased in species richness, but the major diversification of the family Gonyaulaceae, which is present throughout northwest Europe (Wiggan et al 2017) is not manifested. Borges et al (2011) and Borges et al (2012) explained the relatively low Middle and Upper Jurassic dinoflagellate cyst assemblages in the Algarve Basin of Portugal by the fact that this depocentre was a relatively deep water and partially enclosed (restricted) setting.…”

Section: Dinoflagellate Cyst Palaeobiologymentioning

confidence: 99%

“…These authors only recovered three dinoflagellate cysts (Barrón and Azerêdo 2003, p. 285). Other substantial contributions on the Jurassic palynology of Portugal include Mohr and Schmidt (1988), Bucefalo Palliani and , Oliveira et al (2007), Borges et al (2011Borges et al ( , 2012, Barrón et al (2013), Rocha et al (2016), Correia et al (2017aCorreia et al ( , 2017bCorreia et al ( , 2018 and Turner et al (2017).…”

Section: Introductionmentioning

confidence: 99%

The Middle Jurassic palynostratigraphy of the northern Lusitanian Basin, Portugal

Correia¹,

Riding²,

Henriques³

et al. 2019

nos

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A composite largely Middle Jurassic succession spanning the Toarcian-Aalenian transition to the lowermost Bathonian exposed at Cabo Mondego and São Gião in the northern Lusitanian Basin, western Portugal, was examined palynologically. The 129 samples are correlated to ammonite biozones (ABs) spanning Pleydellia aalensis to Zigzagiceras zigzag. The Cabo Mondego succession comprises the type section of the Cabo Mondego Formation and spans virtually the entire interval studied. This is a significant interval because it includes the Global Stratotype Section and Point (GSSP) and the Auxiliary Stratigraphical Section and Point (ASSP) for the Bajocian and Bathonian stages respectively. The Cabo Mondego Formation largely yielded relatively abundant palynomorph associations in the 68 2 productive samples recovered. By contrast, the Póvoa da Lomba Formation at São Gião only includes the Toarcian-Aalenian transition; the 21 productive horizons produced sparse assemblages. The uppermost Toarcian to lowermost Bajocian is characterised by a low diversity dinoflagellate cyst association, typified by Nannoceratopsis. Above this is a markedly more diverse assemblage, dominated by the family Gonyaulaceae. This influx, in the Witchellia laeviuscula AB, represents a global evolutionary radiation which may be linked to sea level rise. The lower Bajocian yielded significant proportions of gonyaulacacean forms with epicystal and multiplate precingular archaeopyles, representing morphological experimentation as part of this radiation. The trend of increasing dinoflagellate cyst diversity continued at the Bajocian-Bathonian transition, particularly sexiform tabulate gonyaulacaceans with single plate precingular archaeopyles. The Middle Jurassic dinoflagellate cyst associations of the Lusitanian Basin are significantly less diverse than coeval palynobiotas from eastern and northern Europe, and the Arctic. The Toarcian Oceanic Anoxic Event (T-OAE) profoundly inhibited cyst-forming dinoflagellates in this depocentre, and the recovery was protracted. Hence the T-OAE may have suppressed dinoflagellate cyst diversity well into the Middle Jurassic. This phenomenon may have been exacerbated by the absence of typically Arctic taxa through latitudinal controls and/or global cooling during the early Aalenian. These low levels of dinoflagellate cyst species richness may also be related to the palaeogeography of the Lusitanian Basin. This relatively isolated deepwater depocentre close to the Proto Atlantic, may have precluded extensive biotal exchange with the widespread shelfal areas of the western Tethys. The absence of Dissiliodinium giganteum in the Lusitanian Basin is consistent with this scenario. The pollen and spores observed in this study are typical of Middle Jurassic assemblages worldwide. Araucarian pollen, largely Callialasporites, diversified and became prominent during the Aalenian.

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The Jurassic (Pliensbachian to Kimmeridgian) palynology of the Algarve Basin and the Carrapateira outlier, southern Portugal

Cited by 28 publications

References 36 publications

The palynology of the lower and middle Toarcian (Lower Jurassic) in the northern Lusitanian Basin, western Portugal

The palynology of the lower and middle Toarcian (Lower Jurassic) in the northern Lusitanian Basin, western Portugal

The age of the Tojeira Formation (Late Jurassic, Early Kimmeridgian), of Montejunto, west-central Portugal

The Middle Jurassic palynostratigraphy of the northern Lusitanian Basin, Portugal

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