Transient global cooling at the onset of early Aptian oceanic anoxic event (OAE) 1a

Kuhnt, Wolfgang; Holbourn, Ann; Moullade, Michel

doi:10.1130/g31554.1

Cited by 119 publications

(118 citation statements)

References 23 publications

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“…In essence, carbon-isotope segment C3 in the El Pui section is distinctly defined by a most pronounced negative trend of ~2‰, in a manner similar to the  13 C profile widely recognized in the literature (Menegatti et al, 1998;Renard et al, 2005;Millán et al, 2009;Kuhnt et al, 2011;Papp et al, 2013). At El Pui the stratigraphic range of carbon-isotope segment C3 extends ~36 m (Figs.…”

Section: Accepted Manuscriptmentioning

confidence: 92%

The influence of regional factors in the expression of oceanic anoxic event 1a (OAE1a) in the semi-restricted Organyà Basin, south-central Pyrenees, Spain

Sanchez-Hernandez

Maurrasse

2016

Palaeogeography, Palaeoclimatology, Palaeoecology

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Section: Accepted Manuscriptmentioning

confidence: 92%

The influence of regional factors in the expression of oceanic anoxic event 1a (OAE1a) in the semi-restricted Organyà Basin, south-central Pyrenees, Spain

Sanchez-Hernandez

Maurrasse

2016

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…This pattern of positive δ 13 C carb -δ 18 O covariation continued a relationship that characterized each of the major climate events of the Middle and Late Devonian (e.g., Joachimski et al, , 2004van Geldern et al, 2006). A similar relationship for Cretaceous oceanic anoxic events (OAEs) has stimulated a debate regarding whether increased organic carbon burial leads to lower atmospheric pCO 2 and climatic cooling (e.g., Sinninghe Damste et al, 2010;Kuhnt et al, 2011), or whether climatic cooling causes increased marine productivity and organic carbon burial (e.g., Broecker and Henderson, 1998;Stanley, 2010).…”

Section: Relationship Between C-n Cycle Perturbations and Coeval Climmentioning

confidence: 96%

The TICE event: Perturbation of carbon–nitrogen cycles during the mid-Tournaisian (Early Carboniferous) greenhouse–icehouse transition

et al. 2015

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“…For instance, in the Cismon core, Erba et al (2010) describe values oscillating between -0.5‰ and -3.0‰ and in Cassis-La Bédoule (Kunht, Holbourn and Moullade 2011) similar oscillations vary between -1 .5‰ and -2.5‰. However most Cuchía values are higher than -5‰, which is the figure taken in recent sediments as the lower limit of marine carbonates (James and Choquette 1990).…”

mentioning

confidence: 87%

“…Kunht, Holbourn and Moullade 2011;Lorenzen et al 2013;Maurer et al 2012;Bottini et al 2015). They rely on the assumption that weak carbonate diagenesis can change the mean δ 18 O value of a series, but usually preserves the high-frequency O-isotope variations (e.g.…”

mentioning

confidence: 99%

The OAE1a in Cuchía (Early Aptian, Spain): C and O geochemistry and global correlation

García‐Mondéjar¹,

Fernández‐Mendiola²,

Owen³

2015

Acta Geologica Polonica

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ABSTRACT:García-Mondéjar, J., Fernándes-Mendiola, F. and Owen, H.G. 2015. The OAE1a in Cuchía (Early Aptian, Spain): C and O geochemistry and global correlation. Acta Geologica Polonica, 65 (4), 525-543. Warszawa.C-isotopes, TOC and O geochemical data from the lower Aptian Cuchía section in the western BasqueCantabrian basin (BCB) allow an accurate delimitation of the OAE1a-equivalent and its geochemical Menegatti´s segments, a detailed δ 13 C carb correlation with regional and interregional sections, and a high-resolution construction of TOC and bulk-rock δ 18O carb curves and their interpretation. The δ 13C carb values range from -2‰ and +4‰ (VPDB). They agree with previous data from the eastern BCB sections (Aralar) confirming the ammonite age of the OAE1a in the Basque-Cantabrian basin: Deshayesites forbesi, Deshayesites deshayesi, and Deshayesites deshayesi-Dufrenoyia furcata transition Zones. Interregional δ 13 C carb correlation with pelagic (Cismon, Italy, and Mid-Pacific Mountains, DSDP Site 463) and neritic (Roquefort-La Bédoule, France) core sections, reveals a common profile of a wide negative excursion characteristic of the OAE1a. It consists of a double trough separated by a flat relative maximum, with two negative spikes in the upper trough of neritic sections. TOC absolute values range from 0.12% to 1.37%. Segments of the TOC curve with persistent low values closely correspond with descending segments of the δ 13 C carb curve, and are attributed to lesser organic productivity in the BCB. Detailed bulk-rock δ 18O carb data (-5.71‰ to -1.05 ‰ PDB) and variation curve show two main positive O-isotope shifts and three minor positive inflections, within a general negative trend characteristic of the OAE1a. The two major positive shifts correspond to both shallowing upwards sequences and the lowermost can be related to a eustatic sea level fall. Independent interregional correlation of the O-isotope shifts with C-isotopes supports their interpretation as punctuating colder events within a general warming trend.

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Transient global cooling at the onset of early Aptian oceanic anoxic event (OAE) 1a

Cited by 119 publications

References 23 publications

The influence of regional factors in the expression of oceanic anoxic event 1a (OAE1a) in the semi-restricted Organyà Basin, south-central Pyrenees, Spain

The influence of regional factors in the expression of oceanic anoxic event 1a (OAE1a) in the semi-restricted Organyà Basin, south-central Pyrenees, Spain

The TICE event: Perturbation of carbon–nitrogen cycles during the mid-Tournaisian (Early Carboniferous) greenhouse–icehouse transition

The OAE1a in Cuchía (Early Aptian, Spain): C and O geochemistry and global correlation

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