δ13C of terrestrial vegetation records Toarcian CO2 and climate gradients

Ruebsam, Wolfgang; Reolid, Matías; Schwark, Lorenz

doi:10.1038/s41598-019-56710-6

Cited by 78 publications

(47 citation statements)

References 47 publications

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“…Other researchers hold relatively consistent opinions about the negative correlation between δ 13 C and precipitation. Reduced regional precipitation is associated with relatively high δ 13 C value due to reduction in isotopic fractionation during photosynthesis [ 37 , 52 , 53 ]. Thus, the δ 13 C data fluctuation in this study may be used to indicate precipitation changes in the Xianghu area.…”

Section: Discussionmentioning

confidence: 99%

Early to Mid-Holocene Palaeoenvironment Change and Sedimentary Evolution in the Xianghu Area, Zhejiang

Sha

Tang

et al. 2020

IJERPH

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A 2.5 m long sediment core (XH-2) obtained from Xianghu area, near the Kuahuqiao site, were analyzed for grain size, diatom index, and geochemistry of organic carbon. The results of the total organic carbon (TOC) and stable organic carbon isotope (δ13C) in sediment samples from core XH-2 in the Xianghu area in Zhejiang Province have revealed the evolution history of sedimentary environmental and climatic changes during the breeding–prosperity–decline period of the Kuahuqiao culture. During 9300–8200 cal a BP, TOC contents were relatively high and stable, whereas δ13C values tended to be negative. This condition indicated that the climate was humid, and the sedimentary environment in the Xianghu area was stable. During 8200–7500 cal a BP, TOC contents presented a fluctuating declining trend, and δ13C values were significantly high, implying that the climate was arid, and the Xianghu area was gradually reduced to land. Thus, conducive conditions were provided for the development of the Kuohuqiao culture (7700–7400 cal a BP). From 7500 cal a BP, TOC contents obviously declined, and δ13C values were partially low, suggesting strengthened hydrodynamic force and wet conditions in the Xianghu area. This condition was related to the rise in sea level at approximately 7400 cal a BP, and the Kuahuqiao site became obsolete due to the transgression event. The TOC contents in core XH-2 were remarkably influenced by grain size, whereas no significant correlation existed between the δ13C variability and grain size. Sedimentary environment changes in the Xianghu area from 9300 to 6600 cal a BP, which was reflected by the TOC and δ13C records in core XH-2, accorded with the diatom results in this core and those in the Baima Lake area.

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Section: Discussionmentioning

confidence: 99%

Early to Mid-Holocene Palaeoenvironment Change and Sedimentary Evolution in the Xianghu Area, Zhejiang

Sha

Tang

et al. 2020

IJERPH

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“…Within the thin-bedded limestones δ 13 C increases to as much as 1.83 ‰. The negative CIE is also located in the lower part of the Serpentinum Zone elsewhere in the Subbetic (Reolid, 2014a;Reolid et al, 2014aReolid et al, , 2020bRodrigues et al, 2019;Ruebsam et al, 2020a) and in other basins around the world (e.g. Jenkyns and Clayton, 1986;Saelen et al, 1996;Erba, 2004;Mattioli et al, 2004;Tremolada et al, 2005;Wignall et al, 2005;Hesselbo et al, 2007;Suan et al, 2010;Izumi et al, 2012;Xu et al, 2018;Baghli et al, 2020;Ruebsam et al, 2020b).…”

Section: Geochemistrymentioning

confidence: 96%

“…Research on environmental global events that affected past marine ecosystems offers us the chance to elaborate models for understanding ongoing worldwide changes. The Toarcian oceanic anoxic event (T-OAE; Early Jurassic), also known as the Jenkyns Event (Müller et al, 2017;Reolid et al, 2020a), is a very useful past analogue. This global event was an abrupt palaeoenvironmental perturbation entailing marine transgression (Hallam, 1987;Pittet et al, 2014;Haq, 2018) coeval with a widespread deposition of black shales (Jenkyns, 1988;Bellanca et al, 1999;Röhl et al, 2001;McArthur, 2019), global warming (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Jenkyns and Clayton, 1986;Saelen et al, 1996;Suan et al, 2010;Reolid, 2014a;Baghli et al, 2020) and land ecosystems (as evidenced in land plant organic matter; e.g. Hesselbo et al, 2007;Ruebsam et al, 2020a). This global change led to a biotic crisis constituting a secondorder mass extinction for benthic organisms (Little and Benton, 1995;Aberhan and Fürsich, 2000;Cecca and Macchioni, 2004;Wignall et al, 2005;Gomez and Goy, 2011;Danise et al, 2013Danise et al, , 2019Caruthers et al, 2014;Rita et al, 2016), M. Reolid: Microfossil assemblages and geochemistry for interpreting the Jenkyns Event probably driven by oxygen depletion affecting many platforms and deep oceanic environments (Röhl et al, 2001;Bucefalo Palliani et al, 2002;Wignall et al, 2005;Hermoso et al, 2009;Caruthers et al, 2014;Them et al, 2018;Reolid et al, 2012aReolid et al, , 2019a.…”

Section: Introductionmentioning

confidence: 99%

“…Boomer et al, 2009;Reolid et al, 2014aReolid et al, , 2015McArthur, 2019). Reolid et al (2020a) propose the use of the term T-OAE only when studying marine deposits holding evidence of oxygen-depleted conditions; the term Jenkyns Event (Müller et al, 2017) is more appropriate for the global changes that occurred during the early Toarcian (including the anoxic event).…”

Section: Introductionmentioning

confidence: 99%

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Microfossil assemblages and geochemistry for interpreting the incidence of the Jenkyns Event (early Toarcian) in the south-eastern Iberian Palaeomargin (External Subbetic, SE Spain)

Reolid¹

2020

J. Micropalaeontol.

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Abstract. By studying the facies, geochemistry, and microfossil assemblages of the uppermost Pliensbachian and lower Toarcian of the Cueva del Agua section, I was able to appraise the impact of the Jenkyns Event in the eastern part of the South Iberian Palaeomargin (Western Tethys). Depleted oxygen conditions are envisaged for the Polymorphum–Serpentinum Zone boundary (lower Toarcian), represented by dark marls, precisely in a laminated interval. The decrease in the α diversity of foraminifera and ostracods, along with greater proportions of opportunists such as Lenticulina, Eoguttulina, and Cytherella just before the negative carbon isotopic excursion (CIE), would indicate a disturbance of the environmental conditions during the initial phase of the biotic crisis. The peak of the biotic crisis is characterized by an absence of trace fossils, increased organic matter content, an increased Mo∕Al ratio, and negative CIE and δ18O, as well as fewer specialist forms and more opportunists. This biotic crisis peak is related to oxygen-depleted conditions in the bottom waters and in the sediment pore water, while warming negatively affected microfauna – to the point of leaving a barren benthic horizon in the record. Recovery is evidenced by the occurrence of carbonate layers with hummocky cross-stratification and a decrease in organic matter content, the Mo∕Al ratio, and the trace fossil record. In terms of microfauna, the first phase of recovery shows highly abundant foraminifera, ostracods, and microgastropods, mainly opportunist forms. After the proliferation of opportunist forms, a second phase of recovery is marked by a progressive increase in α diversity.

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Biomarker and compound-specific isotope records across the Toarcian CIE at the Dormettingen section in SW Germany

Ajuaba

Sachsenhofer

Bechtel

et al. 2022

Int J Earth Sci (Geol Rundsch)

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The Toarcian oceanic anoxic event (T-OAE) is associated with a prominent negative carbon isotope excursion (CIE; ~ 183 million years (Myr)). About 10-m-thick organic matter-rich sediments accumulated during the T-OAE in the Southwest German Basin (SWGB). Rock–Eval, maceral and biomarker analysis were used to determine variations of environmental conditions across the CIE interval. Carbon isotope records were determined for various n-alkanes, pristane and phytane to contribute to the reconstruction of the paleo-environment and to study the factors controlling molecular δ13C values. Geochemical redox indicators provide evidence for photic zone anoxia during the Toarcian CIE, which reached its maximum after deposition of the “Unterer Stein” marker horizon. The 2α-methylhopane index suggests enhanced activity of diazotrophic cyanobacteria, which is also supported by nitrogen isotope data. This distinguishes the SWGB from other basins with Toarcian black shale. Oxygen-depleted conditions, albeit with lower intensity continued after the CIE. All investigated compounds replicate the negative CIE, but the magnitudes vary considerably. The largest shift is observed for n-C27 (9‰) and reflects the combined effect of the global CIE and a major change in organic matter input (termination of terrigenous organic matter input). The shift for short-chain n-alkanes, pristane, and phytane, interpreted to reflect marine biomass, varies between 4.5 and 5.0‰. This is the highest value observed so far for any Toarcian section. δ13C values of pristane and phytane reach a minimum near the base of the CIE interval and increase upsection. Thus, the maximum negative isotope shift predates the strongest basin restriction by about 450 thousand years (kyr).

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δ13C of terrestrial vegetation records Toarcian CO2 and climate gradients

Cited by 78 publications

References 47 publications

Early to Mid-Holocene Palaeoenvironment Change and Sedimentary Evolution in the Xianghu Area, Zhejiang

Early to Mid-Holocene Palaeoenvironment Change and Sedimentary Evolution in the Xianghu Area, Zhejiang

Microfossil assemblages and geochemistry for interpreting the incidence of the Jenkyns Event (early Toarcian) in the south-eastern Iberian Palaeomargin (External Subbetic, SE Spain)

Biomarker and compound-specific isotope records across the Toarcian CIE at the Dormettingen section in SW Germany

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