The evolution of Iberia during the Jurassic from palaeomagnetic data

Osete, M. L.; Gómez, Juan José Morales; Pavón-Carrasco, Fco. Javier; Villalaín, Juan José; Palencia-Ortas, A.; Ruiz-Martínez, V. C.; Heller, Friedrich

doi:10.1016/j.tecto.2010.05.025

Cited by 53 publications

(27 citation statements)

References 64 publications

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“…5 • 22 22 ). Palaeogeographical reconstruction based on comprehensive palaeomagnetic data, performed by Osete et al (2010), locates the Rodiles section studied at a latitude of approximately 32 • N for the Hettangian-Sinemurian interval, which is in good agreement with the calculations of Van Hinsbergen et al (2015) and at a latitude of almost 40 • N (the current latitude of Madrid) for the Toarcian-Aalenian interval. The section was deposited in an open marine external platform environment with sporadic intervals of oxygen deficiency.…”

Section: Methodssupporting

confidence: 77%

Palaeoclimatic oscillations in the Pliensbachian (Early Jurassic) of the Asturian Basin (Northern Spain)

Gómez

Comas-Rengifo²,

Goy

2016

Clim. Past

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Abstract. One of the main controversial themes in palaeoclimatology involves elucidating whether climate during the Jurassic was warmer than the present day and if it was the same over Pangaea, with no major latitudinal gradients. There has been an abundance of evidence of oscillations in seawater temperature throughout the Jurassic. The Pliensbachian (Early Jurassic) constitutes a distinctive time interval for which several seawater temperature oscillations, including an exceptional cooling event, have been documented. To constrain the timing and magnitude of these climate changes, the Rodiles section of the Asturian Basin (Northern Spain), a well exposed succession of the uppermost Sinemurian, Pliensbachian and Lower Toarcian deposits, has been studied. A total of 562 beds were measured and sampled for ammonites, for biochronostratigraphical purposes, and for belemnites, to determine the palaeoclimatic evolution through stable isotope studies. Comparison of the recorded latest Sinemurian, Pliensbachian and Early Toarcian changes in seawater palaeotemperature with other European sections allows characterization of several climatic changes that are likely of a global extent. A warming interval partly coinciding with a δ 13 C bel negative excursion was recorded at the Late Sinemurian. After a "normal" temperature interval, with temperatures close to average values of the Late Sinemurian-Early Toarcian period, a new warming interval containing a short-lived positive δ 13 C bel peak, developed during the Early-Late Pliensbachian transition. The Late Pliensbachian represents an outstanding cooling interval containing a δ 13 C bel positive excursion interrupted by a small negative δ 13 C bel peak. Finally, the Early Toarcian represented an exceptional warming period, which has been pointed out as being responsible for the prominent Early Toarcian mass extinction.

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Section: Methodssupporting

confidence: 77%

Palaeoclimatic oscillations in the Pliensbachian (Early Jurassic) of the Asturian Basin (Northern Spain)

Gómez

Comas-Rengifo²,

Goy

2016

Clim. Past

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“…Saelen et al, 1996;Jenkyns, 2003;Rosales et al, 2004;Gómez et al, 2008;Metodiev and Koleva-Rekalova, 2008;Suan et al, 2008;Dera et al, 2009;Gómez and Arias, 2010;García Joral et al, 2011;Gómez and Goy, 2011). Calculated average seawater paleotemperature in Europe for this interval was 13.7°C as indicated by this compilation , lower than the expected paleotemperature from the paleolatitudinal position of Europe at this time (Osete et al, 2011). Reggiani et al (2010) observed a major reorganization in the phytoplankton community structure during the Late Pliensbachian of Portugal, where assemblages dominated by C. crassus during a warm period, the Margaritatus AZ, became dominated by Mitrolithus jansae and Schizosphaerella spp.…”

Section: Nannofossil Assemblages and Climate Change Before The Extincmentioning

confidence: 64%

“…2 and 5). This temperature can be considered as notably low, for a calculated paleolatitude of 30°N during the Toarcian based on paleomagnetical studies (Osete et al, 2000(Osete et al, , 2011. A first step of progressive seawater warming started in the Lower Toarcian Tenuicostatum AZ, reaching an average paleotemperature of 15.4°C in the West Rodiles area.…”

Section: The Influence Of Temperature On Nannoplankton Assemblagesmentioning

confidence: 99%

The calcareous nannofossil crisis in Northern Spain (Asturias province) linked to the Early Toarcian warming-driven mass extinction

Fraguas¹,

Comas-Rengifo²,

Gómez

et al. 2012

Marine Micropaleontology

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“…They are composed of olivine, augite and variable proportions of plagioclase (Ancochea et al et al, 2004). Vesicles up to 3-4 cm in diam- Osete et al (2011) and Schettino and Turco (2011). eter, formed from gas bubbles exolved as a result of a low hydrothermal and pore water circulation (Fig.…”

Section: Volcanic Depositsmentioning

confidence: 99%

Middle Jurassic volcanism in a magmatic-rich passive margin linked to the Caudiel Fault Zone (Iberian Range, East of Spain): biostratigraphical dating

Cortés

Gómez

2016

Journal of Iberian Geology

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During the Early and Middle Jurassic, the Iberian Basin (East of Spain) recorded the transition from a generally magma-poor passive margin, which operated during the latest Triassic and most of Early Jurassic, to a magma-rich passive margin, developed from Pliensbaextensional fault zones. One of these zones of weakness, from which the volcanic deposits were expelled to the sea bottom, was the Caudiel -formations. So far, the accurate age of these volcanisms, critical in the knowledge of the palaeogeographical and geodynamical evolution of the Iberian Basin, has remained uncertain. The ammonite content of the carbonate successions, with which these rocks are interbedded, allows precise biostratigraphical dating at the chronozone scale. For this purpose, 9 sections have been measured and 360 specimens of ammonites were collected and determined. The obtained data indicate that the Middle Jurassic volcanic deposits that are linked to the Caudiel Fault Zone and included into the El Pedregal Formation show a slight diachrony. They were deposited around the boundary between the Late Aalenian Concavum and the Early Bajocian Discites chronozones. However, in very restricted areas of the Caudiel Fault Zone, an older intra-Murchisonae volcanism was recorded.Keywords: Volcanism, Biochronostratigraphy, Ammonites, Middle Jurassic, Iberian Range ResumenDurante el Jurásico Inferior y Medio, la Cuenca Ibérica (Este de España) registró la transición de un margen pasivo pobre en magmatismo, que operó durante el Triásico terminal y la mayor parte del Jurásico Inferior, a un margen pasivo rico en actividad magmática, que se desarrolló desde el Pliensbachiense hasta el comienzo del Jurásico Medio. El volcanismo submarino, fundamentalmente piroclástico y con volcánicas que tuvieron lugar a lo largo del Jurásico Medio en relación con esta línea de debilidad. La fase principal se manifestó mientras y geodinámica de la Cuenca Ibérica, ha permanecido incierta. El contenido en ammonites de las sucesiones de carbonatos, entre los que del Jurásico Medio que están asociados a la Zona de Falla de Caudiel e incluidos en la Formación El Pedregal muestran una sincronía casi perfecta. Se depositaron hacia el límite entre la Cronozona Concavum del Aaleniense Superior y la Cronozona Discites del Bajociense Inferior. Con anterioridad, un volcanismo de edad intra-Murchisonae quedó registrado en áreas muy localizadas de la Zona de Falla de Caudiel.

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The evolution of Iberia during the Jurassic from palaeomagnetic data

Cited by 53 publications

References 64 publications

Palaeoclimatic oscillations in the Pliensbachian (Early Jurassic) of the Asturian Basin (Northern Spain)

Palaeoclimatic oscillations in the Pliensbachian (Early Jurassic) of the Asturian Basin (Northern Spain)

The calcareous nannofossil crisis in Northern Spain (Asturias province) linked to the Early Toarcian warming-driven mass extinction

Middle Jurassic volcanism in a magmatic-rich passive margin linked to the Caudiel Fault Zone (Iberian Range, East of Spain): biostratigraphical dating

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