Continuous accumulation of organic matter-rich sediments associated with Oceanic Anoxic Event 1a in the El Pujal section, Organyà Basin, Catalunyà Spain and its relation to episodic dysoxia

Socorro, Jander; Maurrasse, F. J.

doi:10.1016/j.cretres.2018.11.009

Cited by 14 publications

(46 citation statements)

References 174 publications

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“…Structurally the outcrop is located along the northern limb of the Santa Fé syncline (42°13′06.15″N, 1°18′55.85″E), and on the south side of the Cabó River valley in the municipality of Organyà ( Figure 1C). Previous studies of lower beds exposed on the north side of the valley reported the OAE 1a record up to carbon isotope segment C5 (Sanchez-Hernandez andMaurrasse, 2014, 2016;, which has been correlated with the lowermost part of the El Pujal section (Socorro and Maurrasse, 2019).…”

Section: Geological Frameworkmentioning

confidence: 83%

“…The Organyà Basin located in the Iberian Peninsula ( Figure 1A,B) developed as a semi-enclosed basin during the Early Cretaceous, and previous studies document extensive successions of continuous hemipelagic marls and limestones (Berástegui et al, 1990;Bachmann and Willems, 1996;Bernaus et al, 2000Bernaus et al, , 2002Bernaus et al, , 2003García-Senz, 2002;Sanchez-Hernandez andMaurrasse, 2014, 2016;Llaguno, 2017;Socorro and Maurrasse, 2019). This study further extends analysis of the Early Aptian related to OAE 1a at the El Pujal section (Figure 1C,D;Socorro and Maurrasse, 2019) and aims at understanding the lithological and geochemical responses to changing palaeoenviromental conditions associated with carbon isotope segment C5. A multi-proxy methodology is applied to better characterize the local factors that resulted in the accumulation of organic-rich sediments during this period known for widespread severe oxygen deficient conditions.…”

Section: Introductionmentioning

confidence: 86%

“…Here, the investigation focuses on 70.75 m of the Cabó Marls in continuity with the previously discussed 13.77 m basal segment of the El Pujal Section ( Figure 1D; Socorro and Maurrasse, 2019), which consists of a succession of limestones, argillaceous limestones and marlstones exposed as differentially weathered packets of beds ( Figure 1E). and (B) modified from Dinarès-Turell and García-Senz, 2000).…”

Section: Geological Frameworkmentioning

confidence: 99%

“…and (B) modified from Dinarès-Turell and García-Senz, 2000). (C) Detailed geological map of the studied area showing the location of the El Pui Section (Sanchez-Hernandez andMaurrasse, 2014, 2016; and the El Pujal Section (Socorro and Maurrasse, 2019; and this study). (C) Modified from Gong et al (2009).…”

Section: Geological Frameworkmentioning

confidence: 99%

“…(D) Satellite image showing the portion of the El Pujal Section studied thus far. Basal portion refers to a previous study by Socorro and Maurrasse (2019). (D) Modified from Google Earth Map Data 2018.…”

Section: Geological Frameworkmentioning

confidence: 99%

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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: Geological Frameworkmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 86%

Section: Geological Frameworkmentioning

confidence: 99%

Section: Geological Frameworkmentioning

confidence: 99%

Section: Geological Frameworkmentioning

confidence: 99%

See 3 more Smart Citations

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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Chemostratigraphic characteristics of trace elements, biomarkers and clay mineralogy indicating environmental conditions within Aptian sediments of the Organyà Basin, North‐east Spain, prior to the onset of OAE 1a

Herdocia

Maurrasse

2022

The Depositional Record

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Shifting palaeoceanographic and palaeoclimatic conditions together with fluctuating eustatic sea levels during the Early Cretaceous Aptian stage led to a globally widespread deposition of organic-rich marine sediments designated Oceanic Anoxic Event 1a. Here a detailed lithostratigraphic and geochemical study is presented for 35.6 m of the Cabó Formation, part of the Organyà Basin, North-east Spain, to assess intermittent periods of enhanced organic carbon preservation in Lower Aptian sediments preceding Oceanic Anoxic Event 1a. The Organyà area contains well-exposed outcrops of Mesozoic black to dark grey marlstones and limestones with variable amount of organic matter (OM) indicative of oxygendeficient conditions. Previous work in a section near the town of Organyà focussed on lithostratigraphy and biostratigraphy and assigned a Barremian-Aptian age. This study aims to provide an updated age based on carbon isotope correlation established elsewhere, and assess the chemostratigraphic characteristics of the Barremian-Aptian to clarify environmental changes regarding oxygen deficient conditions in the basin at that time. The δ 13 C org values fluctuate from −22.1 to −24.4‰ showing concurrence with results at the El Pui section west of the studied section. Chemostratigraphic correlation of the δ 13 C org reveals that the section is within segment C2, in the Lower Aptian. Redox-sensitive trace elements (V, Ni, Co, Cr, Cu, Mo) indicate heightened dysoxic conditions at five organic-rich layers, here designated carbonaceous layers (TOC >2%), associated with enhanced terrigenous fluxes coincident with increased major elements (Al, Si and Ti) during these intervals. Biomarkers from six levels showed n-alkane distributions with chain lengths from nC 14 to nC 34 , mostly below nC 21 indicating a predominance of marine-derived OM. Climate conditions inferred from variable smectite, and kaolinite content suggests fluctuating humid-warm conditions. The results thus reveal that the Organyà Basin experienced intervals of distinct oxygen-poor conditions prior to the onset of Oceanic Anoxic Event 1a. How to cite this article: Herdocia C. & Maurrasse FJ-M.R. (2022) Chemostratigraphic characteristics of trace elements, biomarkers and clay mineralogy indicating environmental conditions within Aptian sediments of the Organyà Basin, North-east Spain, prior to the onset of OAE 1a.

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Geochemistry of the Aptian bituminous limestones in Gümüşhane area, Eastern Black Sea region: new insight into paleogeography and paleoclimate conditions

Özyurt

2023

Acta Geochim

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Continuous accumulation of organic matter-rich sediments associated with Oceanic Anoxic Event 1a in the El Pujal section, Organyà Basin, Catalunyà Spain and its relation to episodic dysoxia

Cited by 14 publications

References 174 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

Chemostratigraphic characteristics of trace elements, biomarkers and clay mineralogy indicating environmental conditions within Aptian sediments of the Organyà Basin, North‐east Spain, prior to the onset of OAE 1a

Geochemistry of the Aptian bituminous limestones in Gümüşhane area, Eastern Black Sea region: new insight into paleogeography and paleoclimate conditions

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