Development of carbonate platforms on an extensional (rifted) margin: the Valanginian–Albian record of the Prebetic of Alicante (SE Spain)

Jiménez, José Manuel Castro; Gea, Ginés A. de; Ruiz-Ortiz, P. A.; Nieto, Luís M.

doi:10.1016/j.cretres.2008.05.012

Cited by 50 publications

(35 citation statements)

References 22 publications

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“…3) has been also recognized in this section (Aguado et al, 1999;de Gea et al, 2003). The stratigraphy, biostratigraphy, and isotope chemostratigraphy of the Cau section have been presented in detail in previous publications from outcrop studies made at a decimetre to metre scale (Aguado et al, 1999;de Gea et al, 2003;Castro et al, 2008;Naafs et al, 2016).…”

Section: The Cau Sectionmentioning

confidence: 99%

New drilling of the early Aptian OAE1a: the Cau core (Prebetic Zone, south-eastern Spain)

et al. 2016

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Abstract. The Cretaceous was punctuated by several episodes of accelerated global change, defined as Oceanic Anoxic Events (OAEs), that reflect abrupt changes in global carbon cycling. The Aptian Oceanic Anoxic Event (OAE1a; 120 Ma) represents an excellent example, recorded in all major ocean basins, and associated with massive burial of organic matter in marine sediments. The OAE1a is concomitant with the "nannoconid crisis", which is characterized by a major biotic turnover, and a widespread demise of carbonate platforms. Many studies have been published over the last decades on OAE1a's from different sections in the world, and provide a detailed C-isotope stratigraphy for the event. Nevertheless, new high-resolution studies across the event are essential to shed light on the precise timing and rates of the multiple environmental and biotic changes that occurred during this critical period of Earth history.Here we present a new drill core recovering an Aptian section spanning the OAE1a in southern Spain. The so-called Cau section was drilled in the last quarter of 2015. The Cau section is located in the easternmost part of the Prebetic Zone (Betic Cordillera), which represents platform deposits of the southern Iberian palaeomargin. The lower Aptian deposits of the Cau section belong to a hemipelagic unit (Almadich Formation), deposited in a highly subsident sector of the distal parts of the Prebetic Platform. Previous work on the early Aptian of the Cau succession has focused on stratigraphy, bioevents, C-isotope stratigraphy, and organic and elemental geochemistry. A more recent study based on biomarkers has presented a detailed record of the pCO 2 evolution across the OAE1a (Naafs et al., 2016). All these studies reveal that the Cau section represents an excellent site to further investigate the OAE1a, based on its unusually high sedimentation rate and stratigraphic continuity, the quality and preservation of fossils, and the well-expressed geochemical signatures.

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Section: The Cau Sectionmentioning

confidence: 99%

New drilling of the early Aptian OAE1a: the Cau core (Prebetic Zone, south-eastern Spain)

et al. 2016

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“…Contemporaneously in the SIPM environments, a short epi sode of organic-rich sediment deposition took place in the shallower Cau sector, whereas in shallow carbonate platforms of the SIPM a drowning event took place (i.e. Castro et al, 2008;Castro et al, 2012). An interesting question is the temporal relationship between platform drowning and the onset of the OAE1a (i.e.…”

Section: Om Sources and Environmental Conditionsmentioning

confidence: 99%

“…This distribution could reflect an expansion of the OMZ, reaching shallower areas on the margins, coincident with a major transgres sion, which could favor increased continental runoff and an increase in nutrient inputs (i.e. Burla et al, 2008;Castro et al, 2008;Blattler et al, 2011;Najarro et al, 2011a). Similar models of expansion of the OMZ have been proposed for the OAE2 (i.e.…”

Section: Om Sources and Environmental Conditionsmentioning

confidence: 99%

“…The high organic matter content along with the plank tonic foraminifers association (with elongation of the chambers) have been proposed to be related to anoxic-dysoxic conditions in the water column during sedimentation (Aguado et aL, 1999;de Gea et aL, 2003). The stratigraphy, biostratigraphy and isotope chemostratigraphy of the Cau section have been presented in detail in previous publications (Aguado et aL, 1999;de Gea et aL, 2003;Castro et aL, 2008 Rosales et aL, 2009;Najarro et aL, 2011b), com prising open marine, black marls and marly siltstones. These deposits, which represent the local record of the OAE1a, reflect the shutdown of the shallow water carbonate factory, as the result of a combined…”

Section: Introductionmentioning

confidence: 99%

“…One major environmental per turbation is the widespread drowning event recorded at multiple sites (i.e. Weissert et al, 1998;Follmi et al, 2006;Castro et al, 2008;Najarro et al, 2011a;Castro et al, 2012). In addition, notable faunal and facies changes in carbonate platforms have been related to the OAEla (i.e.…”

Section: Introductionmentioning

confidence: 99%

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Organic geochemistry, stable isotopes, and facies analysis of the Early Aptian OAE—New records from Spain (Western Tethys)

Quijano

Jiménez

Pancost

et al. 2012

Palaeogeography, Palaeoclimatology, Palaeoecology

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The Early Aptian Oceanic Anoxic Event (OAEla) is a time interval characterized by increased organic carbon accumulation in marine sediments, notable sedimentary and biotic changes, and abrupt carbon-isotope excursions indicative of significant major palaeoenvironmental changes linked to a perturbation in the global carbon cycle. Here we present the study of four sections recording the OAEl a (Early Aptian) in Spain, which are located in two broad basins respectively located in the South and the North of Iberia: the Southern Iberian Palaeomargin (Carbonero, La Frontera and Cau sections) and the Basque-Cantabrian Basin (Puentenansa section), which represent depositional settings ranging from shallow marine (distal ramp -Cau-and drowned platform -Puentenansa-) to pelagic environments (Carbonero, La Frontera). Biomarker compositions, C-isotope profiles, biostratigraphic data and fades analysis from the four sections are correlated and integrat ed. The C-isotope curves all present a clear negative excursion followed by a positive shift. The integration of the C-isotope curves with the biostratigraphic data has been used to correlate the studied sections and to ten tatively identify the eight segments formerly proposed from the Alpine domain, and subsequently identified in sections worldwide. Four main groups of compounds are present in all sections: n-alkanes, isoprenoids, hopanes and steranes. n-Alkanes and acyclic isoprenoids (pristane and phytane) are dominant in most samples.The hopanes are represented by a range ofC27 to C35 components, with the specific isomers varying amongst the sections due to differences in thermal maturity. Steranes ocrur as a range of C27, C28 and C29 isomers, whereas diasteranes only occur in the most thermally mature section (Carbonero). Other compounds of interest include gammacerane and dinosterane. Differences in thennal maturity appear to be the first order control on different biomarker assemblages amongst the studied sections. The Carbonero section is thermally mature, whereas the nearby La Frontera and Cau sections are immature. Puentenansa has intermediate values. Organic matter is de rived from a range of terrestrial, marine and bacterial sources. The dominance of the C29 sterane isomers in all sections suggests a strong contribution from higher plants. The presence of gammacerane indicates water col umn stratification, and high C2g/C30 hopane ratios suggest anoxia at the water/sediment interface, respectively.Sedimentologic analysis also suggests anoxic conditions during sedimentation, but evidence for strong and per sistent water column anoxia is equivocaL The correlation of the sections reveals that sedimentation of organic-rich fades started earlier in pelagic and later in the shallow marine settings, which can be related to an expansion of the favorable conditions for organic matter accumulation and preservation from deep marine waters to shallower platform environments during the development ofOAEla.

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Extreme Mesozoic Crustal Thinning in the Eastern Iberia Margin: The Example of the Columbrets Basin (Valencia Trough)

et al. 2018

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Eastern Iberia preserves a complex succession of Mesozoic rifts partly or completely inverted during the Late Cretaceous and Cenozoic in relation with Africa‐Eurasia convergence. Notably, the Valencia Trough, classically viewed as part of the Cenozoic West Mediterranean basins, preserves in its southwestern part a thick Mesozoic succession (locally ≈10 km thick) over a highly thinned continental basement (locally only ≈3.5 km thick). This subbasin, referred to as the Columbrets Basin, represents a Late Jurassic‐Early Cretaceous hyperextended rift basin weakly overprinted by subsequent events. Its initial configuration is well preserved allowing us to unravel its 3‐D architecture and tectonostratigraphic evolution in the frame of the Mesozoic evolution of eastern Iberia. The Columbrets Basin benefits from an extensive data set combining high‐resolution seismic reflection profiles, drill holes, seismic refraction data, and expanding spread profiles. The interactions between halokinesis, involving the Upper Triassic salt, and extensional deformation controlled the architecture of the Mesozoic basin. The thick uppermost Triassic to Cretaceous succession displays a large‐scale “syncline” shape, progressively stretched and dismembered toward the basin borders. We propose that the SE border of the basin is characterized by a large extensional detachment fault acting at crustal scale and interacting locally with the Upper Triassic décollement. This extensional structure accommodates the exhumation of the continental basement and part of the crustal thinning. Eventually, our results highlight the complex interaction between extreme crustal thinning and occurrence of a prerift salt level for the deformation style and tectonostratigraphic evolution of hyperextended rift basins.

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Development of carbonate platforms on an extensional (rifted) margin: the Valanginian–Albian record of the Prebetic of Alicante (SE Spain)

Cited by 50 publications

References 22 publications

New drilling of the early Aptian OAE1a: the Cau core (Prebetic Zone, south-eastern Spain)

New drilling of the early Aptian OAE1a: the Cau core (Prebetic Zone, south-eastern Spain)

Organic geochemistry, stable isotopes, and facies analysis of the Early Aptian OAE—New records from Spain (Western Tethys)

Extreme Mesozoic Crustal Thinning in the Eastern Iberia Margin: The Example of the Columbrets Basin (Valencia Trough)

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