Plate tectonic trigger of changes in pCO2 and climate in the Oxfordian (Late Jurassic): Carbon isotope and modeling evidence

Louis-Schmid, Beat; Rais, Pauline; Schaeffer, Philippe; Bernasconi, Stefano M.; Weissert, Helmut

doi:10.1016/j.epsl.2007.03.014

Cited by 35 publications

(23 citation statements)

References 63 publications

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“…V and U both have in common that there is no detrital influence to their concentration in marine sediments. As already mentioned above, the turning point of the isotope excursion coincides with a major change in the Tethyan sedimentation pattern [1][2][3]. This was also the time of a profound rearrangement of the oceanic current system induced by the establishment of a new circum-global ocean passage in low latitudes.…”

Section: Discussionmentioning

confidence: 57%

“…The turning point of the excursion coincides with a major change in Tethyan sedimentation pattern [1]. According [2] there is no evidence for large-scale volcanism during the Oxfordian.…”

Section: Discussionmentioning

confidence: 86%

“…Studies [1,2] report a 13 C excursion in the "Argovien" facies (marls with marly limestone) from Trescléoux where samples were taken within the upper section for this study (Fig. 2).…”

Section: Resultsmentioning

confidence: 99%

“…The "Terre Noires" also have slightly elevated organic carbon contents (up to 0.8 ‰ in the "Terre Noires"). In the upper part of the "Terre Noires", limestone becomes dominant [1,2].…”

Section: Study Site and Sample Materialsmentioning

confidence: 99%

“…However all the prior studies [1][2][3] lack the information about trace element contents in these sediments. For to this reason the following study was accomplished.…”

Section: Introductionmentioning

confidence: 99%

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Trace Elements in Marine Sediments from the Oxfordian (Late Jurassic): Implications for Seawater Chemistry, Erosional Processes, Changes in Oceanic Circulation and More

Müller¹

2012

TOGEOJ

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Abstract:The Oxfordian, first stage of the late Jurassic, is remarkably variable in terms of deposited sediments, geochemical tracers, and climate. The climate changed during the Middle Oxfordian from humid to arid with a temperature rise of more than five degrees. During this time, the 13 C reached maximum values. The positive excursion in 13 C of carbonates from the Oxfordian (with an amplitude of more than 1‰) was reproduced in hemipelagic sections from southeastern France. Analysis of major and trace elements of these carbonates were carried out by LA-ICP-MS in order to verify their application as palaeoproxies in conjunction with the changes mentioned in climate. As a novel approach 36 elements were measured with regard to establish a complete and comprehensive analysis of the geochemical situation. Concentration peaks of P, Sr, Mn, Fe, Ba point to a more oligotrophic setting within the lower part of the sediment profile from southeastern France. Conversely, the positive 13 C excursion with 13 C values rising from 2 to 3 ‰ within the uppermost part of the profile coincide with more elevated concentrations of V, Fe, Mn, U arguing for an ocean-wide anoxia (Oceanic Anoxic Events OAE). High detrital input during this arid period is recorded by enhanced concentrations of elements like Ti, Mn, Fe, Zr, Nb and W. This correlation of the 13 C excursion with trends in Ti, Nb, W as well as Mn and Fe contents reflects changes in the Oxfordian palaeooceanography and climate. During the late Oxfordian the environmental prerequisites were controlled by warm and arid conditions and an increased metal flux from the continent due to the intensified chemical and physical weathering, erosion of rocks, as well as aeolian and fluvial transport to the oceans.

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Section: Discussionmentioning

confidence: 57%

“…The turning point of the excursion coincides with a major change in Tethyan sedimentation pattern [1]. According [2] there is no evidence for large-scale volcanism during the Oxfordian.…”

Section: Discussionmentioning

confidence: 86%

“…Studies [1,2] report a 13 C excursion in the "Argovien" facies (marls with marly limestone) from Trescléoux where samples were taken within the upper section for this study (Fig. 2).…”

Section: Resultsmentioning

confidence: 99%

“…The "Terre Noires" also have slightly elevated organic carbon contents (up to 0.8 ‰ in the "Terre Noires"). In the upper part of the "Terre Noires", limestone becomes dominant [1,2].…”

Section: Study Site and Sample Materialsmentioning

confidence: 99%

“…However all the prior studies [1][2][3] lack the information about trace element contents in these sediments. For to this reason the following study was accomplished.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Trace Elements in Marine Sediments from the Oxfordian (Late Jurassic): Implications for Seawater Chemistry, Erosional Processes, Changes in Oceanic Circulation and More

Müller¹

2012

TOGEOJ

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Axial obliquity control on the greenhouse carbon budget through middle‐ to high‐latitude reservoirs

et al. 2015

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Carbon sources and sinks are key components of the climate feedback system, yet their response to external forcing remains poorly constrained, particularly for past greenhouse climates. Carbon-isotope data indicate systematic, million-year-scale transfers of carbon between surface reservoirs during and immediately after the Late Cretaceous thermal maximum (peaking in the Cenomanian-Turonian, circa 97-91 million years, Myr, ago). Here we calibrate Albian to Campanian (108-72 Myr ago) high-resolution carbon isotope records with a refined chronology and demonstrate how net transfers between reservoirs are plausibly controlled by~1 Myr changes in the amplitude of axial obliquity. The amplitude-modulating terms are absent from the frequency domain representation of insolation series and require a nonlinear, cumulative mechanism to become expressed in power spectra of isotope time series. Mass balance modeling suggests that the residence time of carbon in the ocean-atmosphere system is-by itself-insufficient to explain the Myr-scale variability. It is proposed that the astronomical control was imparted by a transient storage of organic matter or methane in quasi-stable reservoirs (wetlands, soils, marginal zones of marine euxinic strata, and potentially permafrost) that responded nonlinearly to obliquity-driven changes in high-latitude insolation and/or meridional insolation gradients. While these reservoirs are probably underrepresented in the geological record due to their quasi-stable character, they might have provided an important control on the dynamics and stability of the greenhouse climate.

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Orbital Signals in Carbon Isotopes: Phase Distortion as a Signature of the Carbon Cycle

2017

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Isotopic mass balance models are employed here to study the response of carbon isotope composition (δ13C) of the ocean‐atmosphere system to amplitude‐modulated perturbations on Milankovitch time scales. We identify a systematic phase distortion, which is inherent to a leakage of power from the carrier precessional signal to the modulating eccentricity terms in the global carbon cycle. The origin is partly analogous to the simple cumulative effect in sinusoidal signals, reflecting the residence time of carbon in the ocean‐atmosphere reservoir. The details of origin and practical implications are, however, different. In amplitude‐modulated signals, the deformation is manifested as a lag of the 405 kyr eccentricity cycle behind amplitude modulation (AM) of the short (~100 kyr) eccentricity cycle. Importantly, the phase of AM remains stable during the carbon cycle transfer, thus providing a reference framework against which to evaluate distortion of the 405 kyr term. The phase relationships can help to (1) identify depositional and diagenetic signatures in δ13C and (2) interpret the pathways of astronomical signal through the climate system. The approach is illustrated by case studies of Albian and Oligocene records using a new computational tool EPNOSE (Evaluation of Phase in uNcertain and nOisy SEries). Analogous phase distortions occur in other components of the carbon cycle including atmospheric CO2 levels; hence, to fully understand the causal relationships on astronomical time scales, paleoclimate models may need to incorporate realistic, amplitude‐modulated insolation instead of monochromatic sinusoidal approximations. Finally, detection of the lagged δ13C response can help to reduce uncertainties in astrochronological age models that are tuned to the 405 kyr cycle.

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Plate tectonic trigger of changes in pCO2 and climate in the Oxfordian (Late Jurassic): Carbon isotope and modeling evidence

Cited by 35 publications

References 63 publications

Trace Elements in Marine Sediments from the Oxfordian (Late Jurassic): Implications for Seawater Chemistry, Erosional Processes, Changes in Oceanic Circulation and More

Trace Elements in Marine Sediments from the Oxfordian (Late Jurassic): Implications for Seawater Chemistry, Erosional Processes, Changes in Oceanic Circulation and More

Axial obliquity control on the greenhouse carbon budget through middle‐ to high‐latitude reservoirs

Orbital Signals in Carbon Isotopes: Phase Distortion as a Signature of the Carbon Cycle

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