Characterization of the negative carbon isotope shift in segment C2, its global implications as a harbinger of OAE1a

Socorro, Jander; Maurrasse, F. J.; Sanchez-Hernandez, Yosmel

doi:10.1007/s11430-016-0092-5

Cited by 11 publications

(10 citation statements)

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“…The high sediment accumulation rate in the Organyà Basin (Sanchez-Hernandez et al, 2014) generated an expanded archive that documents continuous changes that permit high-resolution chemostratigraphic studies of OAE 1a. Hence, the carbon isotopic data of the Organyà Basin have revealed details of OAE 1a carbon isotope segments not disclosed elsewhere (Figure 11; Sanchez-Hernandez andMaurrasse, 2014, 2016;Socorro et al, 2017). The present results (70.75 m portion) obtained from the El Pujal section complement two previous carbon isotopic curves obtained for segment C1 through the early part of C5 from the El Pui section (Sanchez-Hernandez and Maurrasse, 2014, 2016; Sanchez-Hernandez et al, 2014) and the lower 13.77 m at El Pujal (Socorro and Maurrasse, 2019).…”

Section: Chemo/biostratigraphic Correlationmentioning

confidence: 79%

Regional palaeoenvironmental influence on organic matter sequestration and characteristics of carbon isotope segment C5 in a hemipelagic sequence, Organyà Basin, northeast Spain

Socorro

Maurrasse

2020

The Depositional Record

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The Cretaceous marine sedimentary record is punctuated by episodes of unusually high rates of organic carbon burial termed oceanic anoxic events. The El Pujal Section archives the response to perturbations of the global carbon cycle associated with Oceanic Anoxic Event 1a in a hemipelagic setting of the Organyà Basin. Here, the aim is to understand the lithological and geochemical responses to changing palaeoenviromental conditions associated with carbon isotope segment C5 of Oceanic Anoxic Event 1a. A multi‐proxy approach is applied to characterize how regional factors influenced the accumulation of organic‐rich sediments during this period of severe oceanic oxygen deficiency. Source specific biomarkers demonstrate that the bulk organic matter derives from in‐situ production, with lesser inputs from allochthonous sources. High‐resolution stable carbon isotope data (δ13Corg) were used to establish the refined details of segment C5. Pulses of fluvial fluxes associated with climate fluctuations supplied variable quantities of terrestrial organic matter with more negative isotopic values, which left their intrinsic signature superimposed on the global δ13Corg signal of segment C5 as minor negative spikes. Primary production sustained by fluvial inputs of biolimiting elements provided abundant labile organic matter conducive to oxygen‐deprived conditions as attested by concomitant peaks in total organic carbon, relatively lower benthic faunal counts, lower bioturbation index, higher concentration of pyrite and enrichments in redox sensitive trace elements. However, organic matter preservation was not chiefly controlled by redox conditions as physical encapsulation by clay minerals probably played a significant role. In addition, coincident inputs of terrestrial organic matter with more inert properties and prone to be bound to clay minerals supplemented the accumulation of organic matter, especially during intervals of enhanced terrigenous fluxes. The combined results underscore how despite sharing common global forcing factors, regional palaeoenvironmental conditions are more important in determining the sedimentary expression of Oceanic Anoxic Event 1a.

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Section: Chemo/biostratigraphic Correlationmentioning

confidence: 79%

Regional palaeoenvironmental influence on organic matter sequestration and characteristics of carbon isotope segment C5 in a hemipelagic sequence, Organyà Basin, northeast Spain

Socorro

Maurrasse

2020

The Depositional Record

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“…Whether or not the onset of the Hg anomaly coincided in time with that of the initial osmium-isotope shift to less radiogenic values is unknown, given that the data derive from different sections. The negative carbon-isotope excursion in the C2 Segment may be of global significance [143].…”

Section: Evidence For Trace-element Enrichments and Sulfur-isotope Excursions During Early Aptian Oceanic Anoxic Event 1amentioning

confidence: 99%

Transient cooling episodes during Cretaceous Oceanic Anoxic Events with special reference to OAE 1a (Early Aptian)

Jenkyns¹

2018

Phil. Trans. R. Soc. A.

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The two major oceanic anoxic events of the Cretaceous, those of the Early Aptian (OAE 1a) and the Cenomanian-Turonian boundary (OAE 2), registered some of the highest temperatures reconstructed for the Cretaceous Period, and are thought to be related to the input of volcanically derived carbon dioxide from one or more Large Igneous Provinces. Widely distributed deposition of marine organic matter, the hallmark of OAEs, and intensified silicate weathering in response to a globally accelerated hydrological cycle and/or reaction of seawater with freshly extruded basalt, are both potential mechanisms whereby the content of atmospheric carbon dioxide could have been drawn down to promote cooling, on the assumption that this potential effect was not offset by increased addition of this volcanically derived greenhouse gas. Reduction in the supply of such carbon dioxide, with deposition of organic matter and silicate weathering continuing at the same rate, could also have produced cooling. A transient fall in temperature and increase in marine dissolved oxygen levels is well documented for OAE 2, in the form of the so-called Plenus Cold Event or Benthic Oxic Event, associated with southward invasion of certain boreal faunas and an increase in many redox-sensitive and/or chalcophilic elements in seawater caused by temporary loss of anoxic-euxinic sinks as basalt-seawater interaction continued apace. High-resolution studies of OAE 1a show at least three cooling episodes of probable global distribution, one of which (recorded in the stratigraphy of the so-called C4 Segment) is documented at high enough resolution to show correlation with an increase in carbon-isotope values that was probably due to a rise in the quantities of organic matter being buried globally, with consequent potential drawdown of atmospheric CO and/or reduction in volcanic input of this greenhouse gas. Both calcium- and lithium-isotope records suggest an increase in silicate weathering over the OAE 1a interval but current relatively low-resolution records cannot at present be tied to any one cooling episode, although the lowest Li-isotope values do derive from the C4 Segment. Evidence for reoxygenation of the ocean during the transient cooling episodes of OAE 1a is meagre, due to the lack of suitable sedimentary archives, although a negative sulfur-isotope excursion in a Pacific shallow-water carbonate section, which can be interpreted as due to oxidation of pyrite and/or sulfur-rich organic matter in the global ocean, suggests that this phenomenon may also have been a feature of the C4 Segment. Further work is required to elucidate the similarities and differences between OAE 2 and OAE 1a, but both phenomena are demonstrably global in reach and represent major disturbances to the carbon cycle with attendant effects on marine temperatures.This article is part of a discussion meeting issue 'Hyperthermals: rapid and extreme global warming in our geological past'.

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“…Jander Socorro, Florentin J.M. R. Maurrasse, and Yosmel Sanchez-Hernandez (Socorro et al, 2017 this issue) study the C2 segment of the Early Aptian OAE1a, one of the global oceanic anoxic events in the Mesozoic, which represents a distinct carbon isotope negative anomaly of~1.8‰ to~2.23‰. Socorro et al (2017) present a high-resolution organic geochemical study of the C2 interval in the El Pui section, Organyà Basin, Spain, including total organic carbon, total inorganic carbon, δ 13 C org , n-alkanes, microscopic analyses with petrographic microscope and SEM.…”

Section: Overview Of Papersmentioning

confidence: 97%

“…R. Maurrasse, and Yosmel Sanchez-Hernandez (Socorro et al, 2017 this issue) study the C2 segment of the Early Aptian OAE1a, one of the global oceanic anoxic events in the Mesozoic, which represents a distinct carbon isotope negative anomaly of~1.8‰ to~2.23‰. Socorro et al (2017) present a high-resolution organic geochemical study of the C2 interval in the El Pui section, Organyà Basin, Spain, including total organic carbon, total inorganic carbon, δ 13 C org , n-alkanes, microscopic analyses with petrographic microscope and SEM. One of the major findings of this paper is that the total inorganic carbon, the total organic carbon, the δ 13 C org , microfacies, and the n-alkanes show no excursion, neither before, nor during, nor after the C2 negative inflection, indicating that local factors did not enhance the δ 13 C org negative inflection during the C2 interval, thus reflecting a true change within the ocean carbon isotopic reservoir independently.…”

Section: Overview Of Papersmentioning

confidence: 99%

Special Topic: Cretaceous greenhouse palaeoclimate and sea-level changes

Wagreich

Sames

2016

Sci. China Earth Sci.

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Characterization of the negative carbon isotope shift in segment C2, its global implications as a harbinger of OAE1a

Cited by 11 publications

References 61 publications

Regional palaeoenvironmental influence on organic matter sequestration and characteristics of carbon isotope segment C5 in a hemipelagic sequence, Organyà Basin, northeast Spain

Regional palaeoenvironmental influence on organic matter sequestration and characteristics of carbon isotope segment C5 in a hemipelagic sequence, Organyà Basin, northeast Spain

Transient cooling episodes during Cretaceous Oceanic Anoxic Events with special reference to OAE 1a (Early Aptian)

Special Topic: Cretaceous greenhouse palaeoclimate and sea-level changes

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